Ultrastructural alterations of intracellular stages and effects on blood forms of Trypanosoma cruzi induced in vivo by 2-amino-5-(1-methyil-5-nitro-2-imidazolyl)-1,3,4 - Thiadiazole

An electron microscopy study shows that the administration of a single dose (500 mg/kg, p.o.) of 2-amino-5-(1-methyl-5-nitro-2-imidazolyl)-1, 3, 4-thiadiazole induces in mice infected with Trypanosoma cruzi results in degenerative lesions of the intracellular stages. Ultrastructural alterations are...

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Bibliographic Details
Main Authors: Thaisa de Almeida Maria, Leny de Sousa Filardi, Zigman Brener
Format: Article in Journal/Newspaper
Language:English
Published: Sociedade Brasileira de Medicina Tropical (SBMT) 1984
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Online Access:https://doaj.org/article/fd55e8a7a2a44880a710a69162ac16ac
Description
Summary:An electron microscopy study shows that the administration of a single dose (500 mg/kg, p.o.) of 2-amino-5-(1-methyl-5-nitro-2-imidazolyl)-1, 3, 4-thiadiazole induces in mice infected with Trypanosoma cruzi results in degenerative lesions of the intracellular stages. Ultrastructural alterations are detected as early as 6 hours after the drug administration and destruction of the parasites occurs within 18 - 36 hours. Trypomastigotes are cleared from the bloodstream 4 to 6 hours after treatment. The combined effect on both developmental stages is apparently responsible for the in vivo ejfects of this drug which is the most active drug ever tested in our laboratory in experimental Chagas' disease. Um estudo com microscopia eletrônica mostrou que a administração de dose única (500 mg/kg, p.o.) do composto 2-amino-5-(1-metil-5-nitro-2-imidazolil)-1 3, 4-tiadiazole induz, em camundongos inoculados com T. cruzi, lesões degenerativas das formas intracelulares do parasita. Alterações ultra estruturais são observadas 6 horas após a administração da droga e destruição ocorre em 18-36 horas. Tripomastigotas também desaparecem do sangue circulante dos animais 4-6 horas após o tratamento. O efeito em ambos os estágios evolutivos do T. cruzi é aparentemente responsável pelos efeitos in vivo desse derivado que é o mais ativo composto já testado em nosso laboratório na doença de Chagas.