<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0798-0477</journal-id>
<journal-title><![CDATA[Revista del Instituto Nacional de Higiene Rafael Rangel]]></journal-title>
<abbrev-journal-title><![CDATA[INHRR]]></abbrev-journal-title>
<issn>0798-0477</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Higiene Rafael Rangel]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0798-04772016000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Mecanismos de resistencia en micobacterias de crecimiento rápido]]></article-title>
<article-title xml:lang="en"><![CDATA[Resistance mechanisms of rapid growing mycobacteria]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Da Mata J]]></surname>
<given-names><![CDATA[Omaira J]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández F]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[De Waard]]></surname>
<given-names><![CDATA[Jacobus H]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Simón Bolívar Laboratorio de Genética Molecular Bacteriana ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Higiene Rafael Rangel Laboratorio de Diagnósticos Especiales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Insituto de Biomedicina Laboratorio de Tuberculosis ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>47</volume>
<numero>1-2</numero>
<fpage>95</fpage>
<lpage>124</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0798-04772016000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0798-04772016000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0798-04772016000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las Micobacterias de crecimiento rápido (MCR) son patógenos oportunistas capaces de ocasionar infecciones en piel, pulmonares y diseminadas. En Venezuela existe un incremento de estas infecciones derivadas de procedimientos invasivos, entre ellas cirugías estéticas. El tratamiento de esas infecciones requiere la administración de al menos dos antibióticos por varios meses. En la presente revisión se describe los mecanismos de resistencia a los antibióticos que se han reportado en las MCR, principalmente las tres especies que frecuentemente se han asociado a infecciones en piel: M. abscessus, M. chelonae y M. fortuitum. Los factores más importantes relacionados a la resistencia en los esquemas de tratamiento son: cambios relacionados en la permeabilidad de la membrana al antibiótico, la inactivación enzimática y modificaciones del sitio blanco. En MCR se han evidenciado la presencia de betalactamasas con actividad penicilinasas y cefalosporinasas y de acetil-transferasas que pueden modificar los aminoglicósidos. Las modificaciones de las regiones ARNr 23S y ARNr 16S han permitido explicar, en parte, la resistencia a macrólidos y aminoglicósidos. La metilación de los sitios blanco de acción de los macrólidos es otro factor importante, sobre todo en especies como M. abscessus. Éste último mecanismo explica la falla terapéutica que se ha reportado en pacientes tanto en infecciones pulmonares como en infecciones en piel. Es necesario ampliar el estudio sobre los mecanismos de resistencia en estas especies, tomando en consideración las complicaciones que llevan estas infecciones y los tiempos prolongados de tratamientos pudiendo generar efectos secundarios en los pacientes y la frustración cuando ocurre la falla terapéutica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The rapid growing mycobacteria (RGM) are opportunist pathogens able to cause skin, pulmonary and disseminated infections. In Venezuela there is an increase in the prevalence of these infections especially following esthetic surgery. The treatment of such infections is cumbersome requiring the administration of at least two antibiotics for several months. In the present review we describe the principal antibiotic resistance mechanisms reported for RGM, particular for the species most frequently associated with skin and soft tissue infection: M. abscessus, M. chelonae and M. fortuitum. The most important factors associated with resistance to antibiotics are impermeability of the cell membrane, enzymatic inactivation and changes in the target site. In RGM the presence of the beta-lactamases with penicillinases and cephalosporinase activity has been demonstrated and the presence of acetyl-transferases which can modify aminoglycosides. Changes in the 23S rRNA and 16S rRNA regions has allowed to explain, partly macrolide and aminoglycoside resistance. Mutation in the macrolide target site is another important resistance mechanism, particularly for the species group M. abscessus. This last mechanism can explain treatment failure reported in the patients with pulmonary or skin infection. We conclude that there is a need for more extensive studies about the mechanisms of antibiotic resistance of RGM; taking into account the complications of these infections, the prolonged treatment long time, producing secondary effects and the frustrations of patient and physician caused by therapeutic failures.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Micobacterias de crecimiento rápido (MCR)]]></kwd>
<kwd lng="es"><![CDATA[mecanismos de resistencia a antibióticos]]></kwd>
<kwd lng="es"><![CDATA[micobacteriosis]]></kwd>
<kwd lng="en"><![CDATA[rapid growing mycobacteria (RGM)]]></kwd>
<kwd lng="en"><![CDATA[antibiotic resistance mechanisms]]></kwd>
<kwd lng="en"><![CDATA[mycobacteriosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center" style="border: medium none; margin-left: 0cm; margin-right: 0cm; margin-top: 0cm; margin-bottom: .0001pt; padding: 0cm"> <span lang="ES-VE" style="line-height: 115%; font-family: Verdana; text-transform: none; font-weight: 700"> Mecanismos de resistencia en micobacterias de crecimiento rápido</span></p>     <p align="center" style="border: medium none; padding: 0cm"><b> <span lang="EN-US" style="line-height: 200%; font-family: Verdana; letter-spacing: .25pt"> Resistance mechanisms of rapid growing mycobacteria </span></b></p>     <p align="center" style="border: medium none; padding: 0cm"><b> <span lang="PT" style="line-height: 115%; font-family: Verdana"><font size="2"> Omaira J Da Mata J<sup>1,2</sup>, Sandra Fernández F<sup>2</sup>, Margarita  Rodríguez<sup>1</sup>, Jacobus H De Waard</font><sup><font size="2">3</font></sup></span></b></p>     <p style="border: medium none; margin-top: 0cm; padding: 0cm" align="justify"> <sup><span lang="PT" style="font-family: Verdana"><font size="2">1</font></span></sup><span lang="PT" style="font-family: Verdana"><font size="2">Universidad  Simón Bolívar, Laboratorio de Genética Molecular Bacteriana <sup>2</sup>Instituto  Nacional de Higiene “Rafael Rangel”, Laboratorio de Diagnósticos Especiales, <sup>3</sup>Insituto de Biomedicina, Laboratorio de Tuberculosis</font></span></p>     <p align="justify"> <span lang="ES-VE" style="line-height: 200%; font-family: Verdana"> <font size="2">Correo electrónico: </font> <a href="mailto:damataomaira@gmail.com"><font size="2">damataomaira@gmail.com</font></a></span></p>     <p align="left" style="text-align: justify; line-height: normal; margin-top: 0cm"> <b><span lang="ES-VE" style="font-family: Verdana"><font size="2">RESUMEN</font></span></b></p>     <p style="line-height: normal" align="justify"> <span style="font-family: Verdana"><font size="2">Las Micobacterias de  crecimiento rápido (MCR) son patógenos oportunistas capaces de ocasionar  infecciones en piel, pulmonares y diseminadas. En Venezuela existe un incremento  de estas infecciones derivadas de procedimientos invasivos, entre ellas cirugías  estéticas. El tratamiento de esas infecciones requiere la administración de al  menos dos antibióticos por varios meses. En la presente revisión se describe los  mecanismos de resistencia a los antibióticos que se han reportado en las MCR,  principalmente las tres especies que frecuentemente se han asociado a  infecciones en piel: <i>M. abscessus</i>, <i>M. chelonae</i> y <i>M. fortuitum.</i>  Los factores más importantes relacionados a la resistencia en los esquemas de  tratamiento son: cambios relacionados en la permeabilidad de la membrana al  antibiótico, la inactivación enzimática y modificaciones del sitio blanco. En  MCR se han evidenciado la presencia de betalactamasas con actividad  penicilinasas y cefalosporinasas y de acetil-transferasas que pueden modificar  los aminoglicósidos. Las modificaciones de las regiones ARNr 23S y ARNr 16S han  permitido explicar, en parte, la resistencia a macrólidos y aminoglicósidos. La  metilación de los sitios blanco de acción de los macrólidos es otro factor  importante, sobre todo en especies como <i>M. abscessus</i>. Éste último  mecanismo explica la falla terapéutica que se ha reportado en pacientes tanto en  infecciones pulmonares como en infecciones en piel. Es necesario ampliar el  estudio sobre los mecanismos de resistencia en estas especies, tomando en  consideración las complicaciones que llevan estas infecciones y los tiempos  prolongados de tratamientos pudiendo generar efectos secundarios en los  pacientes y la frustración cuando ocurre la falla terapéutica.</font></span></p>     <p style="line-height: normal" align="justify"><b> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Palabras clave</font></span></b><span lang="ES-VE" style="font-family: Verdana"><font size="2">:  Micobacterias de crecimiento rápido (MCR), mecanismos de resistencia a  antibióticos, micobacteriosis</font></span></p>     <p style="line-height: normal" align="justify"><b> <span lang="EN-US" style="font-family: Verdana"><font size="2">ABSTRACT</font></span></b></p>     <p style="line-height: normal" align="justify"> <span lang="EN-GB" style="font-family: Verdana"><font size="2">The rapid growing  mycobacteria (RGM) are opportunist pathogens able to cause skin, pulmonary and  disseminated infections</font></span><span lang="EN-US" style="font-family: Verdana"><font size="2">.  In Venezuela there is an increase in the prevalence of these infections  especially following esthetic surgery. The treatment of such infections is  cumbersome requiring the administration of at least two antibiotics for several  months. In the present review we describe the principal antibiotic resistance  mechanisms reported for RGM, particular for the species most frequently  associated with skin and soft tissue infection: <i>M. abscessus</i>, <i>M.  chelonae</i> and <i>M. fortuitum</i>. The most important factors associated with  resistance to antibiotics are impermeability of the cell membrane, enzymatic  inactivation and changes in the target site. In RGM the presence of the beta-lactamases  with penicillinases and cephalosporinase activity has been demonstrated and the  presence of acetyl-transferases which can modify aminoglycosides. Changes in the  23S rRNA and 16S rRNA regions has allowed to explain, partly macrolide and  aminoglycoside resistance. Mutation in the macrolide target site is another  important resistance mechanism, particularly for the species group<i> M.  abscessus</i>. This last mechanism can explain treatment failure reported in the  patients with pulmonary or skin infection. We conclude that there is a need for  more extensive studies about the mechanisms of antibiotic resistance of RGM;  taking into account the complications of these infections, the prolonged  treatment long time, producing secondary effects and the frustrations of patient  and physician caused by therapeutic failures.</font></span></p>     ]]></body>
<body><![CDATA[<p align="justify"><b> <span lang="EN-US" style="line-height: 200%; font-family: Verdana"> <font size="2">Keywords</font></span></b><font size="2"><span lang="EN-US" style="line-height: 200%; font-family: Verdana">:  </span></font><span lang="EN-US"><font size="2" face="Verdana">rapid growing mycobacteria (RGM), antibiotic resistance mechanisms,  mycobacteriosis</font></span></p>     <p align="justify"><font face="Verdana" size="2">Recibido: 07 de julio de 2016  Aprobado: 22 de septiembre 2016</font></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-MX" style="font-family: Verdana"><font size="2">Las micobacterias  son microorganismos pertenecientes al género <i>Mycobacterium,</i> que tienen </font></span><font size="2"><span lang="ES-VE" style="font-family: Verdana">la  particularidad de retener en su pared la fucsina fenicada a pesar de someterlas  a la acción de decolorantes, esta característica es denominada ácido  resistencia. </span><span lang="ES-MX" style="font-family: Verdana">Actualmente  se reconocen más de 170 especies dentro de este género</span><span lang="ES-VE" style="font-family: Verdana">,  las cuales están clasificadas </span> <span lang="ES-MX" style="font-family: Verdana">en dos grupos las de crecimiento  rápido, que tienen un desarrollo bacteriano antes de 7 días de incubación en  medios de cultivo y las de crecimiento lento (MNTCL), que requieren un tiempo  mayor </span><span lang="ES-VE" style="font-family: Verdana">(1)</span><span lang="ES-MX" style="font-family: Verdana">.  Las micobacterias de crecimiento rápido (</span><span style="font-family: Verdana">MCR</span><span lang="ES-MX" style="font-family: Verdana">)  pueden ocasionar infecciones en piel y tejido blando y su prevalencia es similar  a nivel mundial, siendo <i>M. abscessus</i>, <i>M. chelonae</i> y <i>M.  fortuitum</i> las más frecuentes. </span><span style="font-family: Verdana">En  Venezuela se han reportado brotes relacionados a procedimientos invasivos, con  gran relevancia los relacionados con procedimientos estéticos. Igualmente los  brotes pueden asociarse a infecciones pulmonares y diseminadas</span><span lang="ES-VE" style="font-family: Verdana">  (2-6)</span></font><span style="font-family: Verdana"><font size="2">. </font> </span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">En las últimas  décadas se ha incrementado el interés en los mecanismos de resistencia a  antibióticos por parte de las micobacterias no tuberculosas (MNT). El esquema de  tratamiento de la micobacteriosis </font></span> <span style="font-family: Verdana"><font size="2">es diferente para cada especie  y requiere la combinación de, al menos, dos antibióticos. Por otro lado, los  tiempos prolongados de los esquemas de tratamiento y las fallas terapéuticas que  se han reportado frente a los antibióticos de elección, pueden generar  frustración tanto en los pacientes como en el médico tratante <span lang="ES-VE"> (7-9)</span>. El objetivo de este trabajo es la revisión bibliográfica de los  mecanismos de resistencias de las MCR, con énfasis en <i>M. abscessus</i>, <i>M.  fortuitum</i> y <i>M. chelonae</i>, por ser estas tres especies las principales  patógenas en micobacteriosis en piel. </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span style="font-family: Verdana"><font size="2">Las bacterias pueden presentar  resistencia a los antibióticos principalmente por tres mecanismos: alteraciones  en la permeabilidad de la membrana, inactivación enzimática y modificaciones del  sitio blanco <span lang="ES-VE">(10)</span>. </font></span></p>     <p style="line-height: normal" align="justify"><b><font face="Verdana" size="2"> <span lang="ES-VE">MECANISMOS DE RESISTENCIA POR ALTERACIONES EN LA  PERMEABILIDAD CELULAR</span></font></b></p>     <p style="line-height: normal; text-autospace: none; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">La pared celular  micobacteriana es una estructura compleja compuesta por tres tipos de moléculas:  peptidoglicano, arabinogalactano y ácidos micólicos. La estructura de la pared  otorga propiedades hidrofóbicas que ofrece baja permeabilidad, lo que se ha  asociado a la resistencia intrínseca a procesos de desinfección y a los  antibióticos (11,12). La carga, el tamaño y la hidrofobicidad de los  antibióticos determinan la penetración a través de la membrana celular. Las  tasas de penetración de los antibióticos betalactámicos a través de la pared  celular externa de <i>M. tuberculosis</i> H37Ra, es diez veces mayor que en <i> M. chelonae</i>, y 100 veces menor que en <i>E. coli </i>(13,14). En el caso de <i>M. chelonae</i>, se han reportado estudios que demuestran que su  permeabilidad a los betalactámicos y a otros antibióticos, como los  aminoglicósidos, puede llegar a ser 1000 veces menor que en <i>E. coli, </i> inclusive puede llegar a ser menor que en las MNTCL (15-16). Existen otros  elementos que en combinación con la poca permeabilidad juegan un papel  importante en la resistencia tales como las porinas y las bombas de eflujo.</font></span></p>     <p><span class="carcar"> <span lang="ES-VE" style="font-size: 10.0pt; font-family: Verdana; text-transform: none"> Porinas y bombas de eflujo en la membrana micobacteriana</span></span></p>     <p align="justify"><span lang="ES-VE" style="font-family: Verdana"> <font size="2">Los antibióticos lipofílicos como los macrólidos, rifampicinas y  novobiocina penetran al interior de la célula micobacteriana a través de la  bicapa lipídica por difusión lenta, mientras que los antibióticos de mayor  tamaño como los betalactámicos, tetraciclina, cloranfenicol y fluoroquinolonas,  lo hacen mediante canales de porinas. Las porinas son proteínas integrales de  membrana que funcionan como poros a través de los cuales pueden difundir las  moléculas. En </font></span><font face="Verdana" size="2">MCR </font> <span lang="ES-VE"><font face="Verdana" size="2">se ha descrito la presencia de  la porina MspA (<i>Mycobacterium smegmatis</i> porin A)<b>, </b>una proteína de  184 aminoácidos que tiene una región hidrofílica y una región hidrofóbica (</font><span style="font-family: Verdana"><font size="2"><a href="#fig1">Figura  1</a></font></span><span style="font-size: 12.0pt"><!--[if gte mso 9]><![endif]--></span><font face="Verdana" size="2">).  Su tamaño es de 100 kDa y está conformada por subunidades de 20 kDa que forman  un poro central y ha sido involucrada en la permeabilidad de los fosfatos  orgánicos e inorgánicos. En las especies del género de <i>Mycobacterium</i> se  han descrito otras porinas similares denominadas MspB, MspC y MspD, sin embargo,  MspA es responsable del 90% de la difusión de betalactámicos y 75% de glucosa  (17-22).</font></span></p>     <p align="center"><a name="fig1"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08fig1.gif" width="529" height="195"></a></p>     
]]></body>
<body><![CDATA[<p align="justify"> <span lang="ES-VE" style="line-height: 115%; font-family: Verdana"> <font size="2">La densidad de porinas en la pared celular de <i>M. smegmatis</i>  es 15 veces menor comparado con las bacterias Gram negativas. A través de  microscopía electrónica se ha determinado que <i>M. smegmatis</i> tiene 1000  porinas/µm<sup>2</sup>, a diferencia de las bacterias Gram negativas que tienen  una densidad de 15000 porinas / µm<sup>2</sup>, aproximadamente. Este bajo  número de porinas y la estructura de MspA permite que la membrana externa de <i> M. smegmatis</i> tenga baja permeabilidad a los compuestos hidrofílicos. Sumado  a esto, MspA tiene un solo canal por porina, mientras que otras bacterias Gram  negativas como <i>E. coli</i> tiene 3 canales por porina (23,25)<b>.</b> La  porina MspA tiene dos anillos con residuos de aspartato, cargados negativamente  lo que promueve que los antibióticos betalactámicos, catiónicos e hidrofílicos  crucen la membrana de la pared micobacteriana a través de esta proteína. Se ha  demostrado que la disminución de esta porina se asocia al incremento de las  Concentraciones Mínimas Inhibitorias (CMI) de ampicilina, cefaloridina,  vancomicina y norfloxacina (26,27). En <i>M. chelonae</i> 9917 la porina MspA  tiene una deleción de 40 aminoácidos que está asociada a un incremento en la  resistencia frente a los antibióticos: rifampicina, vancomicina, ciprofloxacina,  claritromicina, eritromicina, linezolid y tetraciclina<i> </i>(28). </font> </span></p>     <p style="text-autospace: none" align="justify"> <span lang="ES-VE" style="line-height: 115%; font-family: Verdana"> <font size="2">Otro papel que se le ha atribuido a la porina MspA es la  resistencia a desinfectantes, como el glutaraldehído. Las cepas mutantes de <i> mspA</i> y <i>mspC</i> muestran resistencia a ortofaldehído (OPA) (28). La  selección de aislados resistentes debido al uso de desinfectantes puede tener  implicaciones importantes en el área clínica, ya que esa resistencia es  compartida con varios antibióticos, algunos de ellos utilizados en la rutina  para el tratamiento de infecciones ocasionadas por </font></span> <font face="Verdana" size="2">MCR </font> <span lang="ES-VE" style="line-height: 115%; font-family: Verdana"> <font size="2">(29). </font></span></p>     <p style="text-autospace: none" align="justify"> <span lang="ES-VE" style="line-height: 115%"><font face="Verdana" size="2">Otras  proteínas localizadas en la membrana bacteriana que se han involucrado en la  resistencia a antibióticos son las bombas de eflujo, las cuales se definen como  transportadores proteicos. Son sistemas de multirresistencia capaces de expulsar  un amplio número de sustratos (30). Rodrigues y col. (31) describieron la  presencia de una bomba de eflujo, que posteriormente se le denominó LfrA. La  deleción de esta bomba genera un aumento en la acumulación de bromuro de etidio  (BrEt) intracelular y el incremento de la sensibilidad a la ciprofloxacina y el  etambutol. Dentro del género <i>Mycobacterium</i> se han descrito otras tres  bombas de eflujo relacionadas a la resistencia antimicrobiana: Tap, Tet(v) y  EfpA, todas pertenecientes a la familia MFS <i>(Major Facilitator Superfamily</i>),  las cuales realizan la expulsión de las sustancias a través de intercambio de  protones (<a href="#Tabla_1">Tabla 1</a></font><span lang="ES-VE" style="line-height: 115%; font-family: Arial"><!--[if gte mso 9]><![endif]--></span></span><font face="Verdana" size="2"><span lang="ES-VE" style="line-height: 115%">).</span></font></p>     <p style="text-autospace: none" align="center"> <b><span lang="es-ve"><font face="Verdana" size="2"><a name="Tabla_1">Tabla 1</a>.  Bombas de eflujo descritas en especies del género Mycobacterium</font></span></b></p>     <p style="text-autospace: none" align="center"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08tab1.gif" width="546" height="259"></p>     
<p style="line-height: normal; text-autospace: none; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">La secuencia  proteica de LfrA tiene un 60% de similitud con el gen <i>qacA</i> de <i>S.  aureus</i> y ha sido asociada a la resistencia de fluoroquinolonas en <i>M.  smegmatis</i>, <i>M. tuberculosis</i> y <i>M. avium </i>(32). La evaluación de  la función de las bombas de eflujo dependientes de fuerza protón motriz se  realiza mediante la utilización de inhibidores de protones, un ejemplo de ellos  es la carbonilcianuro-m-clorofenilhidrazona (CCCP). Liu y col. (33) mediante el  uso de esta molécula pudieron inhibir LfrA, obteniendo el incremento de la  sensibilidad frente a norfloxacina. Se han logrado obtener cepas con alta  resistencia a fluoroquinolonas mediante la sobreexpresión de la LfrA, al  delecionar el gen represor <i>lfrR</i> (34,35). Adicionalmente, se ha demostrado  que esta bomba tiene mayor afinidad por la ciprofloxacina. </font></span></p>     <p style="line-height: normal; text-autospace: none; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">En <i>M.  fortuitum</i> se ha descrito otra bomba de eflujo denominada Tap, perteneciente  a la familia MFS. A través de ensayos utilizando inhibidores de bombas de eflujo  se ha propuesto que podría relacionarse con la resistencia a una variedad de  antibióticos entre ellos: aminoglicósidos, estreptomicina y gentamicina. En  especies de </font></span><span style="font-family: Verdana"><font size="2">MCR </font><span lang="ES-VE"><font size="2">y MNTCL se pueden encontrar secuencias  aminoacídicas de transportadores tipo MFS con similitudes mayor al 70% con la  secuencia de Tap de <i>M. fortuitum</i> (CAA03986.1) (36,37).</font></span></span></p>     <p style="line-height: normal; text-autospace: none; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Las tetraciclinas  tienen muy buena actividad sobre las </font></span><font size="2"> <span style="font-family: Verdana">MCR</span></font><span lang="ES-VE" style="font-family: Verdana"><font size="2">,  sin embargo, se ha reportado la presencia de la bomba de eflujo denominada Tet(V)  en aislados resistentes de <i>M. fortuitum </i>y <i>M. smegmatis</i> (38). El  análisis de la secuencia proteica Tet(V) AAB84282.1 en BLATP disponible en NCBI  (<i>National Center for Biotechnology Information</i>) se pueden observar alto  porcentaje de homología con secuencias proteicas de <i>M. septicum </i>y <i>M.  farcinogenes,</i> que son especies agrupadas dentro del complejo de <i>M.  fortuitum</i> (39). Por el contrario, en las especies <i>M. abscessus</i> y <i> M. chelonae </i>no se encuentran secuencias proteicas descritas con alta  homología, por lo tanto, la Tet(V) al igual que la LfrA parece estar  particularmente presente en la especies del grupo de <i>M.</i> </font><i> <font size="2">fortuitum. </font></i></span></p>     <p align="justify"><span lang="ES-VE" style="font-family: Verdana"> <font size="2">Se ha sugerido que la resistencia a fluoroquinolonas está  asociada con la presencia de otra bomba de eflujo de la familia MFS: EfpA de <i> M. smegmatis</i>. De las especies de MCR se puede encontrar secuencias  aminoacídicas depositadas en la base de datos de BLASTP con alta homología con  EfpA de <i>M. smegmatis</i>, entre ellas <i>M. abscessus</i> y <i>M. fortuitum</i>  (</font></span><span style="font-family: Verdana"><font size="2"><a href="#Tabla_2">Tabla 2</a></font></span><span lang="ES-VE" style="font-family: Verdana"><font size="2">).  Los aislados con mutaciones en el gen que codifica EfpA pierden la resistencia a  las fluoroquinolonas (35,40)</font><i><font size="2">.</font></i></span></p>     <p align="center"><b><span lang="es-ve"><font face="Verdana" size="2"> <a name="Tabla_2">Tabla 2</a>. Comparación de la proteína EfpA de M. smegmatis  MC2 155 (AFP39025.1) con secuencias almacenadas en BLASTP de Micobacterias no  tuberculosas</font></span></b></p>     ]]></body>
<body><![CDATA[<p align="center"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08tab2.gif" width="544" height="212"></p>     
<p style="line-height: normal" align="justify"><b><font face="Verdana" size="2"> <span lang="ES-VE">MECANISMO DE RESISTENCIA POR INACTIVACIÓN ENZIMÁTICA</span></font></b></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">La inactivación  enzimática es otro mecanismo descrito en las bacterias para neutralizar la  acción de los antibióticos. En especies del género <i>Mycobacterium</i> se han  encontrado actividades de betalactamasas, metilasas y acetiltransferasas capaces  de hidrolizar e inactivar una variedad de antibióticos.</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <b><font face="Verdana" size="2"><span lang="ES-VE">Betalactamasas</span></font></b></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span style="font-family: Verdana"><font size="2">Los antibióticos  betalactámicos </font></span><span lang="ES-VE" style="font-family: Verdana"> <font size="2">se caracterizan por tener un anillo &#946;-lactámico, siendo las  penicilinas (penam) y las cefalosporinas (cefam) los dos subgrupos más  estudiados. Los betalactámicos se unen irreversiblemente a los dominios D,D-transpeptidasas  de las proteínas de unión a los betalactámicos (PBP), a través de una estructura  que mimetiza el extremo C terminal del dipéptido D-Ala-D-Ala del peptidoglicano  de la pared celular. Las PBP son las responsables de los puentes peptídicos  intermoleculares que son necesarios para la formación del peptidoglicano  (10,41,42).</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">En general las  MNT son resistentes a la mayoría de los betalactámicos, con las excepciones de  cefoxitina, imipenem y meropenem. La resistencia a estos antibióticos se debe  principalmente a la producción de enzimas betalactamasas, que los inactivan  mediante la ruptura del anillo betalactámico. En las especies del género <i> Mycobacterium</i> los genes que codifican las betalactamasas se localizan a  nivel cromosómico. La mayoría de los estudios sobre las betalactamasas  producidas por especies del género <i>Mycobacterium</i> están enfocados en <i>M.  tuberculosis </i>(BlaC) sin embargo, las MCR presentan un mayor número de  especies que producen dichas enzimas (16,43-48). En <i>M. fortuitum</i> y <i>M.  smegmatis</i> se han descrito dos betalactamasas denominadas BlaF y BlaS,  respectivamente. Al igual que las encontradas en <i>M. tuberculosis</i> tienen  actividades penicilinasas, cefalosporinasas y son inducidas por la presencia de  los betalactámicos (49-53). En 2014 y 2015 se caracterizó la betalactamasa  BlaMab de <i>M. abscessus, </i>la cual es capaz de hidrolizar eficientemente la  ceftarolina, una cefalosporina de amplio espectro que es usada para el  tratamiento de infecciones en piel y tejido blando contra las bacterias con PBP  de baja afinidad a los betalactámicos. La BlaMab no es inhibida por clavulanato,  sulbactam o tazobactam, por el contrario, es capaz de hidrolizarlas y se le  considera como el principal determinante de resistencia para las penicilinas y  cefalosporinas en <i>M. abscessus</i>. En general, BlaMab tiene una mayor  actividad hidrolítica sobre los betalactámicos que BlaC de <i>M. tuberculosis</i>,  con excepción de la cefoxitina (54,55). </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Se ha demostrado  que cepas con alto nivel de producción de betalactamasas y alta resistencia a  penicilina son susceptibles a imipenem y a cefoxitina (56). La afinidad a las  PBP afectan la efectividad del betalactámico, en el caso del imipenem se ha  reportado que tiene alta afinidad por las PBP de <i>M. fortuitum. </i>Se ha  observado poca actividad de las cefamicinas sobre los aislados de <i>M.  fortuitum</i> (57). </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <b><font face="Verdana" size="2"><span lang="ES-VE">Inhibidores de  betalactamasas</span></font></b></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Los inhibidores  de las betalactamasas actúan de manera reversible o irreversible sobre esas  enzimas, no tienen actividad antimicrobiana <i>per se</i> sobre las  micobacterias. Los de importancia clínica son: el clavulanato, el sulbactam y el  tazobactam. En las últimas tres décadas se han publicado algunos estudios que  evalúan la utilidad del uso de la combinación de estos inhibidores para <i>M.  tuberculosis</i>, pudiendo el clavulanato inactivar la betalactamasa BlaC <i>in  vitro</i> (58). Algunos autores han sugerido la introducción de la amoxicilina-clavulánico  dentro del esquema de tratamiento de la tuberculosis que presenta resistencia a  drogas de primera línea. Sin embargo, en otros estudios han reportado poca  eficacia de este inhibidor betalactámico sobre aislados de <i>M. tuberculosis</i>  extremadamente resistentes, llegándose a observar 97% de resistencia. Asimismo  se ha incluido ocasionalmente la combinación de clavulanato-meropenem, con  buenos resultados en el tratamiento de estos casos (59-62)</font><i><font size="2">. </font></i></span></p>     <p style="line-height: normal; text-autospace: none; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">En las MCR  existen pocos estudios que evalúen la actividad de la combinación de  betalactámicos e inhibidores de las betalactamasas. Cynamon y col. (63)  reportaron la reducción <i>in vitro</i> de la CMI de cefalotina y amoxicilina  cuando se combina con el ácido clavulánico, sin embargo la actividad de estos  antibióticos no fue mayor que la encontrada con la cefoxitina. El inhibidor </font><span style="color:black"><font size="2">tazobactam incrementa las  actividades de amoxicilina y cefazolina para <i>M. fortuitum,</i> y cefmetazole,  cefoxitina y ceftizoxima para <i>M. abscessus </i>(48)<i>. </i>Recientemente  Dubée y col. (54) evaluaron la actividad de ceftaroline en combinación con  avibactam, otro inhibidor de betalactamasa, logrando reducir la CMI en 10  aislados del grupo de <i>M. abscessus</i>. En un estudio previo, este inhibidor  fue evaluado con varios betalactámicos, sin embargo la reducción de la CMI  apenas se logró en dos de un total de diez antibióticos ensayados, cuando se usó  el caldo MH con cationes ajustados. Sin embargo, utilizando caldo 7H9  suplementado, los autores obtuvieron una reducción en la mayoría de los  antibióticos, la diferencia de resultados entre los dos medios fue asociado al  uso de Tween 80 en el medio 7H9, ya que puede afectar la membrana y facilitaría  la acción de los antibióticos (64). </font></span></span></p>     ]]></body>
<body><![CDATA[<p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <b><font face="Verdana" size="2">Acetil-transferasas </font></b></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span style="font-family: Verdana"><font size="2">Los aminoglicósidos son  antibióticos claves en el tratamiento de infecciones ocasionadas por especies  del género <i>Mycobacterium</i>. Estos antibióticos se unen de forma  irreversible al sitio A del ribosoma en la subunidad mayor, generando un cambio  conformacional que trae como consecuencia la lectura errónea del ARN mensajero  al alterar la introducción de los aminoácidos y finalmente provocar errores en  la síntesis proteica. Uno de los mecanismos de resistencia a los aminoglicósidos  descrito en las especies del género <i>Mycobacterium</i> es la inactivación por  la acción de acetiltransferasas, adeniltransferasas y fosfotransferasas <span lang="ES-VE">(65)</span>. </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span style="font-family: Verdana"><font size="2">Las MCR son productoras de  enzimas acetiltransferasas cuya función es la acetilación de varios componentes  importantes en los procesos celulares y metabólicos de las micobacterias. En  general, en las </font></span><font size="2"> <span lang="ES-VE" style="font-family: Verdana">MCR se pueden encontrar diversas  enzimas con actividad acetil-transferasas y fosfotransferasas aún no estudiadas  y que pueden ser importantes en la respuesta frente antibióticos que son usados  frecuentemente en el tratamiento (66-68). En l</span></font><span style="font-family: Verdana"><font size="2">as  especies micobacterianas,<i> </i>los genes que codifican estas enzimas tienen  una localización cromosómica. Sin embargo, en el año 2014, Matsumoto y  colaboradores <span lang="ES-VE">(69)</span> hallaron un plásmido que confería  resistencia a kanamicina en una cepa <i>M. abscessus subsp bolletii</i>, al que  denominaron pMAB01 y que contenía genes que codificaban enzimas acetil-transferasas. </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span style="font-family: Verdana"><font size="2">La enzima AAC (2’)-Ib de <i>M.  fortuitum</i></font></span><font size="2"><span lang="ES-VE" style="font-family: Verdana">  acetila</span><span style="font-family: Verdana"> de manera eficiente el grupo  amino en la posición 2 de gentamicina, tobramicina, netilmicina y 6’-N-etilnetilmicina  y con poca eficacia la 2’-N-etilnetilmicina y kanamicina A </span> <span lang="ES-VE" style="font-family: Verdana">(70-72)</span><span style="font-family: Verdana">. </span></font><span lang="ES-VE" style="font-family: Verdana"><font size="2">La  amikacina no es afectada por la AAC (2’) por tener un grupo hidroxilo en lugar  del grupo amino. Sin embargo, en otras especies bacterianas se ha descrito la  presencia de AAC (6’) que sí tiene la capacidad de modificar la actividad de  amikacina (67,68)<span style="color:gray">. </span>Existen otras enzimas que  inactivan los aminoglicósidos mediante la fosforilación de los grupos hidroxilo,  mecanismos muy bien descrito en otros grupos bacterianos. En el caso de las  micobacterias, hay un reporte de una aminoglicosil-fosfotransferasa APH (3”)  encontrada en <i>M. fortuitum </i>que fosforila los grupos OH de la  estreptomicina afectando su actividad (73). </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <b><font face="Verdana" size="2"><span lang="ES-VE">Metilasas</span></font></b></p>     <p align="justify"><span lang="ES-VE"><font face="Verdana" size="2">Las  metilasas son enzimas que catalizan la transferencia de uno o dos grupos metilo  a los residuos adenina en la región peptidil transferasa del ARNr 23S. Esta  región es importante para la interacción de los macrólidos, cuyo sitio de acción  es alrededor del sitio de salida del péptido naciente y el centro de la peptidil  transferasa, de esta manera bloquea la salida de la cadena peptídica (<a href="#fig2">Figura 2</a></font></span><span lang="ES-VE" style="font-size: 12.0pt; font-family: Arial"><!--[if gte mso 9]><![endif]--></span><font face="Verdana" size="2"><span lang="ES-VE">).  Adicionalmente, esta interacción interfiere otros pasos de la síntesis de  proteínas como son: translocación y el bloqueo del acceso del ARNt peptidil  transferasa al ribosoma (74-77).</span></font></p>     <p align="center"><a name="fig2"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08fig2.gif" width="542" height="348"></a></p>     
<p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">En el género <i> Mycobacterium</i> se han descrito varias metilasas, entre ellas: Erm37, Erm38,  Erm39, Erm40 y Erm41 de <i>M. tuberculosis</i>, <i>M. smegmatis</i>, <i>M.  fortuitum, M. mageritense</i> y <i>M. abscessus</i>, respectivamente. En 2003,  Nash y col (75) a través de ensayos de Southern Blot, utilizando sondas de <i> erm38</i>, encontraron que ese gen estaba particularmente en <i>M. smegmatis</i>  y no en otras especies del género <i>Mycobacterium</i> y que difería del <i> erm37</i>, previamente descrito en <i>M. tuberculosis</i>, por lo tanto sugerían  que existía una proteína similar en <i>M. fortuitum</i> (78). En un estudio  posterior, Nash y col. (79) describieron la presencia de dicho gen en <i>M.  fortuitum</i> ATCC 6841, el cual codificaba una metilasa de aproximadamente de  246 aminoácidos. Ese gen fue denominado por los autores <i>erm39</i> y fue  encontrado en aislados de <i>M. fortuitum</i> y conferían resistencia inducible  a la claritromicina. </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">En el año 2009,  se reporta por primera vez un gen que codifica una metilasa que confiere  resistencia inducible a macrólidos en <i>M. abscessus</i>: <i>erm41</i> (80),  con una similitud alrededor del 40% con <i>erm38, erm39 </i>y 69% con el gen <i> erm37</i> de <i>M. tuberculosis</i>. A través de la detección por PCR, pudieron  determinar que <i>erm41</i> puede estar presente en aislados de <i>M. abscessus</i>  de forma truncada, asociado a un fenotipo sensible. La deleción del gen <i>erm41 </i>en<i> </i>aislados dentro del grupo de <i>M. abscessus</i> también ha sido  reportada por otros autores, e inclusive se ha propuesto como herramienta para  identificar <i>M. masiliense</i>, ya que esta es la única especie del grupo en  la que se ha observado dicha deleción<i> </i>(81). La confirmación de este  mecanismo de resistencia fue útil para explicar, en parte, las fallas  terapéuticas de un porcentaje de los casos de infección causados por <i>M.  abscessus</i>, considerando que la claritromicina es uno de los antibióticos  principales en el esquema de tratamiento. Adicionalmente, se ha reconocido dos  variantes de <i>M. abscessus</i> de acuerdo con una mutación en la posición 28  del gen <i>erm41</i>. La variante T28 se ha observado en aislados resistentes a  claritromicina y azitromicina, mientras que la variante C28 son sensibles. (82)</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">La técnica de  microdilución en caldo es usada rutinariamente para la determinación de la  sensibilidad de las micobacterias, realizando la lectura final a las 72 horas,  sin embargo, el fenotipo de resistencia inducible a claritromicina no se puede  detectar con lecturas a los tres días de incubación con el antibiótico, por  ello, varios autores han sugerido una segunda la lectura a los 14 días de  incubación con la claritromicina para la detección del fenotipo resistente  inducible. Esta recomendación han sido incluida en la última edición del Manual  de Susceptibilidad para Micobacterias de la CLSI (del inglés <i>Clinical and  Laboratory Standards Institute</i>). También se ha propuesto el análisis del gen <i>erm41</i> en aislados de <i>M. abscessus</i> para descartar genéticamente  dicha resistencia (80,83-85). </font></span></p>     ]]></body>
<body><![CDATA[<p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Brown-Elliot y  col. (86) determinaron las CMI de claritromicina mediante la técnica de  microdilución en caldo con lecturas a los 14 días de incubación en 199 aislados  de <i>M. mucogenicum</i> y 157 de <i>M. immunogenum</i> y no encontraron  fenotipos de resistencia inducible en estas dos especies. Basados en estos  resultados, los autores sugieren que la búsqueda de la resistencia inducible no  es necesaria en aislados identificados como <i>M. mucogenicum</i> o <i>M.  immunogenum. </i>Previamente, Hansen y col (85) sugirieron también prescindir de  la lectura prolongada en aquellos aislados identificados como <i>M. chelonae</i>.  Sin embargo, en un estudio realizado por Esteban y col. (87), buscaron genes  codificantes de metilasas mediante la técnica de PCR usando iniciadores consenso  descritos por Nash y colaboradores (74) y obtuvieron amplificaciones en 12  aislados de <i>M. chelonae</i>, de los cuales el 33% fueron clasificados <i>in  vitro</i> como intermedios a resistentes a la claritromicina en la primera  lectura incubación;</font></span><font face="Verdana" size="2"><span lang="ES-VE"> </span></font><span lang="ES-VE" style="font-family: Verdana"><font size="2">los  autores no incluyeron la segunda lectura de incubación para descartar  fenotípicamente la resistencia inducible. Como se indica en el mismo estudio,  esto pudiera deberse a diferencias locales o regionales de las cepas o que los  iniciadores utilizados en la PCR son un consenso menos específico, lo que  pudiera generar falsos positivos. </font></span></p>     <p style="line-height: normal" align="justify"><b><font face="Verdana" size="2"> <span lang="ES-VE">MECANISMOS DE RESISTENCIA DEBIDO A MODIFICACIONES DEL SITIO  BLANCO</span></font></b></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <b><font face="Verdana" size="2"><span lang="ES-VE">Mutaciones a nivel de  ARNr16S y ARNr 23S</span></font></b></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">El ribosoma  bacteriano es uno de los sitios blancos de varios grupos de antibióticos, dentro  de los que cabe mencionar aminoglicósidos y macrólidos. La acción de estos  antibióticos es la inhibición de la síntesis de proteínas a través de su  interacción con nucleótidos del ARNr, cerca de sitios que son importantes para  su función, como lo son: la región peptidil transferasa del ARNr 23S, donde se  unen los macrólidos y la región ARNr 16S, sitio blanco para los aminoglicósidos.  Los cambios en los sitios blancos de unión generan desde baja hasta alta  resistencia a estos dos grupos de antibióticos.</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">La resistencia a  macrólidos en micobacterias se ha asociado a mutaciones, principalmente en las  posiciones 2057, 2058 y 2059 del ARNr 23S. De estas mutaciones las más  importantes son aquellas que afectan el bolsillo de unión a los macrólidos, los  cuales se encuentran en la posición 2058 y 2059, de acuerdo con el sistema de  enumeración de <i>E.coli</i> (88-92).</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">La mutación de  A2058G impide la formación de un puente de hidrógeno entre un grupo hidroxilo en  la posición 2 del macrólido y el nitrógeno de la adenina de la posición 2058, lo  que conlleva a la resistencia frente al macrólido (77). Pfister y col. (90),  obtuvieron mediante mutagénesis dirigida, cepas de <i>M. smegmatis</i> con  sustituciones simples, dobles y triples en las posiciones A2057G, A2058G y  U2611C. Los autores demostraron que la mutación simple A2058G genera un patrón  de resistencia a todos los macrólidos, lo cual fue similar a los aislados dobles  y triples (93). Adicionalmente, los nucleótidos A2503 y U2504 del ARNr 23S  también juegan un papel importante en la resistencia de este grupo de  antibióticos, ya que afectan la conformación del bolsillo de unión con la cadena  lateral disacárida de los macrólidos (92). </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Wallace y col.  (88) realizaron el análisis mediante secuenciación de la región ARNr 23S de  aislados clínicos de <i>M. abscessus</i> y <i>M. chelonae</i> obtenidos antes  del inicio del tratamiento de la infección y posterior a la recaída. Los  aislados previos al tratamiento mostraban sensibilidad a claritromicina y  carecían de cambios en la región ARNr 23S. Sin embargo, los aislados obtenidos  posterior al tratamiento y con recaída del paciente mostraban resistencia a  claritromicina, de los cuales, el 62% presentaban un cambio en la posición 2059  y 38% en la posición 2058 del ARNr 23S, siendo la sustitución más frecuente A&#8594;G.</font></span><font face="Verdana" size="2"><span lang="ES-VE"> </span></font><span lang="ES-VE" style="font-family: Verdana"><font size="2">La  monoterapia de las micobacteriosis con macrólidos puede favorecer la selección  de aislados con resistencia, por tal motivo se ha recomendado el tratamiento de  este tipo de infección en combinación con otros antibióticos. </font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Además de los  macrólidos, la acción de los aminoglicósidos pueden ser afectados por las  mutaciones en el ARNr, como se mencionó previamente. En cepas de <i>M. abscessus</i>  naturalmente resistentes a kanamicina, se han encontrado sustituciones en las  posiciones A1408G, G1491T, C1409T y T1406A del ARNr 16S. Estas mutaciones  proveen resistencia a otros aminoglicósidos como: amikacina, tobramicina y  gentamicina. La sustitución A1408G es una de las más importantes en la  adquisición de resistencia a amikacina en <i>M. chelonae</i> y <i>M. abscessus</i>  (94,95). Los aminoglicósidos poseen entre tres y cuatro anillos, de los cuales I  y II son importantes para la interacción del antibiótico con el sitio A, a  través del contacto directo a los nucleótidos de la hélice 44 del ARNr 16S. El  anillo I interactúa con la parte interna del bucle que está formado por A1408,  A1492, A1493 y un par de bases: C1409-G1491 (77,96,97).</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Al igual que los  macrólidos y los aminoglicósidos, otro antibiótico, el linezolid,<b> </b>se une  al sitio A de la subunidad 50S del ribosoma. Las mutaciones A2503G, U2504G y  G2505A confieren resistencia frente a este antibiótico. La presencia de las  mutaciones simples A2503G, G2505A y G2576U incrementan las CMI en dos o más  diluciones. Esto también fue observado con las cepas con mutaciones dobles en  las posiciones 2032, 2499, 2504, 2055 y 2572. Estas mutaciones también han sido  asociadas a la resistencia a otros antibióticos como cloranfenicol y  clindamicina (98).</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <b><font face="Verdana" size="2"><span lang="ES-VE">Mutaciones en genes  codificantes de la ADN Girasa</span></font></b></p>     ]]></body>
<body><![CDATA[<p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Las quinolonas  son antibacterianos sintéticos, de los cuales, las fluoroquinolonas se usan  generalmente en el área clínica. Se caracterizan por tener un grupo fluororo en  el anillo central. Dentro de este grupo, la ciprofloxacina es el antibiótico  usado principalmente para el tratamiento de las infecciones ocasionadas por  especies del complejo de <i>M. fortuitum </i>(10,99).</font></span></p>     <p align="justify"><span lang="ES-VE"><font face="Verdana" size="2">La quinolona  se une a la subunidad A de la ADN girasa (topoisomerasa tipo II), una enzima  tetramérica que actúa durante la replicación para reducir la tensión molecular  causada por el superenrollamiento del ADN, mediante cortes de doble cadena que  luego son unidos por la ligasa (<a href="#fig3">Figura 3</a></font></span><span lang="ES-VE" style="font-size: 12.0pt; font-family: Arial"><!--[if gte mso 9]><![endif]--></span><font face="Verdana" size="2"><span lang="ES-VE">).  Esta proteína tiene dos subunidades: la A, que se une al ADN y la B que es una  ATPasa. En la subunidad A hay un grupo de residuos conocidos como región  determinante de resistencia a quinolonas (QRDR, del inglés <i>quinolone  resistance-determining región</i>), en el cual se centra la interacción con  estos antibióticos (100).</span></font></p>     <p align="center"><a name="fig3"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08fig3.gif" width="542" height="372"></a></p>     
<p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Los primeros  reportes proponen que la sustitución de un codón de la alanina por un codón de  valina en la posición 83 de la subunidad A de la girasa de ADN puede ser parte  de la causa de la resistencia a quinolonas de <i>E. coli</i>. El aminoácido en  la posición 83 (serina o treonina) tiene un grupo hidroxilo que se ha propuesto  como parte importante en las interacciones con las quinolonas. En el caso de <i> M. fortuitum</i>, que presenta sensibilidad intrínseca a ciprofloxacina, su ADN  girasa tiene una serina en esa posición, mientras que otras especies con baja  sensibilidad a este antibiótico como es el caso de <i>M. chelonae</i>, tiene  como residuo alanina (102-104). En 2012, de Moura y col. (105) analizaron  mediante secuenciación los genes <i>gyrA</i> y <i>gyrB</i> de un total de 52  aislados de <i>Mycobacterium abscessus subsp. bolletii</i> provenientes de  pacientes con infecciones posteriores a cirugías. En el estudio encontraron que  la secuencia peptídica contenían una alanina en la posición 83 y fenotípicamente  estos aislados se caracterizaban por mostrar CMI altas a las fluoroquinolonas.  En <i>M. massiliense </i>se han encontrado mutaciones que se traducen en un  cambio en el codón 90 y 92 de la ADN girasa, responsables de la resistencia a  fluoroquinolonas (106)</font></span><span style="font-family: Verdana"><font size="2">.</font></span></p>     <p style="line-height: normal" align="justify"><b><font face="Verdana" size="2"> <span lang="ES-VE">MFPA: PROTEÍNA PENTAPÉPTIDA REPETIDA</span></font></b></p>     <p align="justify"><span lang="ES-VE"><font face="Verdana" size="2">En el género <i>Mycobacterium</i> se ha descrito otro mecanismo de resistencia a las  fluoroquinolonas que se basa en la interacción de dos proteínas, MfpA (pentapéptido)  y MfpB (GTPasa de menor tamaño) con la ADN girasa y se ha sugerido que esta  interacción permite proteger a la ADN girasa de la acción de los antibióticos.  MfpA (del inglés <i><u>m</u>ycobacterial <u>f</u>luroquinolone <u>r</u>esistance <u>p</u>rotein</i>) es una proteína dimérica de 192 aminoácidos perteneciente a  la familia de los pentapéptidos repetidos, los cuales se caracterizan por tener  cada cinco aminoácidos una leucina o fenilalanina y un motivo repetitivo: [S,T,A,V]  [D,N] [L,F] [S,T,R] [G] (107,108). Aún no están claras las funciones biológicas  de esa proteína pero se ha propuesto que MfpA es capaz de mimetizar el ADN-B,  debido a su forma helicoidal en sentido derecho, forma dimérica, dimensiones y  carga negativa, lo que promueve la competencia por la interacción con la ADN  girasa (<a href="#fig4">Figura 4</a></font></span><span lang="ES-VE" style="font-size: 12.0pt; font-family: Arial"><!--[if gte mso 9]><![endif]--></span><font face="Verdana" size="2"><span lang="ES-VE">)  (109-111).</span></font></p>     <p align="center"><a name="fig4"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08fig4.gif" width="542" height="333"></a></p>     
<p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Vetting y col.  (108) refieren que MfpA podría interactuar con el surco electropositivo de  GyrA59 (subunidad A de la ADN girasa), lo que podría inhibir la unión al ADN y  evitar la formación del complejo ADN-girasa que es finalmente el sitio blanco de  acción de las fluoroquinolonas (109,111).</font></span></p>     <p style="line-height: normal; margin-left: 0cm; margin-right: 0cm" align="justify"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">Esta proteína no  ha sido descrita en MCR, por lo que se realizó la búsqueda mediante el análisis  de alineamiento de la secuencia proteica de MfpA de <i>M. tuberculosis</i> (gi:  71042655) usando el programa blastp (BLAST), con la intención de conocer  posibles secuencias con identidad a estos pentapéptidos y se pudieron encontrar  secuencias reportadas con alto porcentaje de similitud (70 a 80%) con la  secuencia proteica de MfpA de <i>M. tuberculosis</i> en especies de MCR como <i> M. fortuitum</i> y <i>M. chelonae</i>. Esto también puede observarse en especies  de MNTCL, entre ellas <i>M. kansasii</i>, <i>M. avium</i> y <i>M. intracellulare</i>.</font></span></p>     <p align="justify"><span lang="ES-VE"><font face="Verdana" size="2">A pesar que  en la última década se ha incrementado el interés de las MCR, sobre todo en <i> M. abscessus</i>, <i>M. fortuitum</i> y <i>M. chelonae</i>, aún son necesarios  estudios que aborden la problemática de la resistencia antimicrobiana de estas  especies. El descubrimiento de las metilasas en los aislados de <i>M. abscessus</i>  es un claro ejemplo de la importancia de estudios que expliquen las causas que  conllevan a las fallas terapéuticas. En la <a href="#fig5">Figura 5</a></font></span><span lang="ES-VE" style="font-size: 12.0pt; font-family: Arial"><!--[if gte mso 9]><![endif]--></span><font face="Verdana" size="2"><span lang="ES-VE">,  se muestra un resumen de los mecanismos de resistencia descritos en las tres  especies de Micobacterias de crecimiento rápido de mayor interés.</span></font></p>     ]]></body>
<body><![CDATA[<p align="center"><a name="fig5"> <img border="0" src="/img/fbpe/inhrr/v47n1-2/art08fig5.gif" width="568" height="628"></a></p>     
<p align="justify"> <span lang="ES-VE" style="font-family: Verdana; font-weight: 700"> <font size="2">REFERENCIAS:</font></span></p>     <!-- ref --><p align="left" style="text-align: justify; line-height: normal; margin-left: 0cm; margin-right: 0cm; margin-top: 0cm; margin-bottom: .0001pt"> <span lang="ES-VE" style="font-family: Verdana"><font size="2">1.&nbsp;Kim O, Cho Y,  Lee K, Yoon S, Kim M, Na H, et al. </font></span> <span lang="EN-US" style="font-family: Verdana"><font size="2">Introducing  EzTaxon-e: a prokaryotic <i>16S rRNA</i> gene sequence database with phylotypes  that represent uncultured species. 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