Resumen

SANCHEZ-VILLALOBOS, Alfredo; ELSEN SAUT, João Paulo; DE ALMEIDA, Ighor Augusto  y  SANCHEZ-COMBITA, Gizelle. Intermediate and simultaneous phases of the chronic syndromes of the poisoning by ingestion of genotypes of the pteridium in bovines. Rev. Cient. (Maracaibo) [online]. 2008, vol.18, n.5, pp.531-541. ISSN 0798-2259.

Three adult female bovines coming from a semi extensive and traditional property located at the Roncador Municipality, Paraná State, Brazil, were studied due to they presented simultaneous neoplasias in urinary blaster and upper alimentary syndrome associated to the spontaneous consumption of the Pteridium genotype. The animal’s age varied between five years and a half and seven years and a half. The clinical symptomatology seen included: body conditions loss, progressive emaciation, dyspnea and noisy breathing, rise of the external volume in oropharynx level, relative disphagia, salivation and halitosis; and intermittent hematuria or microhematuria. The main findings macro and microscopical were important in tongue, esophagus, oropharynx, cardia and urinary blaster consisting of papillomas, papillomas in transition to carcinomas and squamous cells. Of then, the upper locations (tongue and oropharynx) were considered malignant injuries and benign the rest. To the tongue and oropharynx level a malignant transition of squamous cells from papillomas to carcinoma was seen. In esophagus, squamous papilloma was diagnosed, meanwhile in urinary blaster multiple injuries with erosive and/or papillary character were present. It is peculiarized by a diverse degree of cellular differentiation and invasive epidermoide carcinoma well characterized. The papilomatosive injuries, irregular in number and size, were constituted by three development phases: incipient, active and in regression. Epidemiological, clinical, macro and histomorfological findings support other researchers‘ papers that suggest that the signs and injuries match with phases and/or a same pathology‘s syndromes, determined by the consumption of the Pteridium genotype. The intoxication can be seen as a direct answer to a complex multifactorial epidemiologic relation, where there is a narrow connection between the toxic principles of the bracken fern and the infection for bovine papillomavirus. This bond seems to play an important role in the tumors pathogenesis and malignant transformations of the cells due to alterations of the proto oncogen H-ras and the tumor suppressor gene.

Palabras clave : Bovine enzootic hematuria; Pteridium; upper alimentary syndrome; ptaquiloside; papillomavirus bovine type 2 and 4.

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