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https://www.arca.fiocruz.br/handle/icict/5701
MYOCARDIAL CHANGES IN ACUTE TRYPANOSOMA CRUZI INFECTION. ULTRASTRUCTURAL EVIDENCE OF IMMUNE DAMAGE AND THE ROLE OF MICROANGIOPATHY
Vasos Coronários/patologia
Coração/parasitologia
Miocárdio/patologia
Miocárdio/ultraestrutura
Trypanosoma cruzi/ultraestrutura
Animais
Comunicação Celular
Cardiomiopatia Chagásica/imunologia
Cães
Endotélio Vascular/patologia
Endotélio Vascular/ultraestrutura
Linfócitos/patologia
Linfócitos/ultraestrutura
Macrófagos/patologia
Macrófagos/ultraestrutura
Microcirculação
Microscopia Eletrônica
Necrose
Autor(es)
Afiliação
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
National Heart Lung and Blood Institut. National Institute of Health. Bethesda, Maryland
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
National Heart Lung and Blood Institut. National Institute of Health. Bethesda, Maryland
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
National Heart Lung and Blood Institut. National Institute of Health. Bethesda, Maryland
Fundação Oswaldo Cruz. Centro de Pesquisas Gonçalo Moniz. Salvador, BA, Brasil
National Heart Lung and Blood Institut. National Institute of Health. Bethesda, Maryland
Resumo em Inglês
Histological and ultrastructural studies of the hearts of dogs sacrificed 18 to 26 days after intraperitoneal inoculation with 4 x 10(5) blood forms of the 12 SF strain of Trypanosoma cruzi/kg of body weight disclosed myocarditis characterized by parasitic invasion of some myocytes, damage and necrosis of nonparasitized myocytes, and interstitial infiltration by mononuclear cells. Nonparasitized myocytes showed alterations ranging from mild edema to severe myocytolysis. These changes often were accompanied by contacts of myocytes with lymphocytes (both granular and agranular) and macrophages. These contacts were characterized by focal loss of the myocyte basement membrane and close approximation of the plasma membranes of the two cells. Contacts between lymphocytes and capillary endothelial cells were also frequent. Platelet aggregates and fibrin microthrombi were observed in some capillaries. Our findings suggest that immune effector cells play a major role in the pathogenesis of the myocyte damage and the microangiopathy in acute Chagas' disease.
DeCS
Cardiomiopatia Chagásica/patologiaVasos Coronários/patologia
Coração/parasitologia
Miocárdio/patologia
Miocárdio/ultraestrutura
Trypanosoma cruzi/ultraestrutura
Animais
Comunicação Celular
Cardiomiopatia Chagásica/imunologia
Cães
Endotélio Vascular/patologia
Endotélio Vascular/ultraestrutura
Linfócitos/patologia
Linfócitos/ultraestrutura
Macrófagos/patologia
Macrófagos/ultraestrutura
Microcirculação
Microscopia Eletrônica
Necrose
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