"Foram analisados os aspectos das celulas musculares parasitadas pelo Trypanosoma cruzi, na veia da supra-renal de chagasicos cronicos, atraves de exame ao microscopio optico de laminas coradas pela hematoxilina-eosina (HE), PAS, Feulgen e peroxidase-antiperoxidase (PAP) para antigenos do T. cruzi. Alem das modificacoes nucleares descritas anteriormente, os leiomiocitos parasitados exibem alteracoes citoplasmaticas que podem ser vistas mesmo em celulas que albergam poucos parasitas. As formas amastigotas geralmente estao envoltas por halo claro e o citoplasma restante adquire aspecto granuloso ou reticular, basofilo pelo HE, sendo sempre PAS e Feulgen negativos. Estes dados sugerem que o material basofilo no citoplasma deve ser RNA ribossomico. A periferia dos ninhos que mostram uma "membrana" com reacao do PAP para antigenos do T. cruzi fortemente positiva, poderia ser devida a reacao cruzada de material celular rechacado para a periferia ou a difusao de antigenos do T. cruzi e sua adsorcao a periferia celular. O material citoplasmatico PAP positivo poderia resultar de artefato, de reacao imunocitoquimica cruzada, de antigenos tripanossomoticos difundidos ou de antigenos tripanossoma-simile resultantes de interacoes entre o leiomiocito e o parasita (AU)."@pt
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