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1.
Acta cient. venez ; 37(5): 547-53, 1986. tab
Article in English | LILACS | ID: lil-57817

ABSTRACT

The in vitro lymphocyte proliferative responses and some mechanisms possibly involved in immunoregulation, were evaluated in 57 patients with Chagas'disease. The patients were classified as being cardiomyophathic (CDM), with positive complement fixation tests (CFT) for T. cruzi, or as infected chagasic patients (INF) with a positive CFT but without any clinical evidence of cardiac involvement. The in vitro responses to T. cruzi antigens were significantly greater in both groups of patients than in the controls, the intensity of the reactions being greatest in CDM patients. Trypanosoma cruzi antigen-induced suppression of in vitro mitogen responsiveness was not detected in either group of Chagas'patients. The mitogenic responses to PHA of CDM patients were,in fact,significantly lower than those of healthly controls. Con A responses were normal in these patients,as was also the case in INF patients for both mitogens. Cell mixingexperiments, showed an augmentation in responsiveness to PHA by co-cultures of mononuclear cells from CDM patients with those from healthtly controls. This was not observed in combinations of cells from controls and INF patients. Due to thepossible modulatory influences of circulating immune complexes,these were also evaluated,higher levels being found in INF and CDM patients than in controls. Thesignificance of these results in the physiopathology of Chagas'is discussed


Subject(s)
Humans , Male , Female , Chagas Disease/immunology , In Vitro Techniques , Antigens
2.
Acta cient. venez ; 37(4): 363-72, 1986. ilus, tab
Article in Spanish | LILACS | ID: lil-44502

ABSTRACT

Los protozoarios Leishmania sp y Trypanosoma cruzi, ambos pertenecientes al orden kinetosplastida, son los más importantes géneros de este orden por las patogenias tan severas que producen en el hombre y sus animales, así como por su endemicidad en la mayoría de los países de América Latina. En el presente trabajo se hace una revisión comparativa de la respuesta inmunológica mediada por células y de ciertos aspectos de su regulación entre pacientes con leishmaniasis cutánea americana (LCA) y con tripanosomiasis americana (TA). Se concluye en la existencia de ciertos patrones de respuesta inmunológica con características similares entre los pacientes con leishmaniasis cutánea localizada (LCL) y pacientes infectados (INF) chagásicos, así como entre los pacientes con leishmaniasis cutánea mucosa (LCM) y las cardiomiopatías (CDM) chagásicas. Esto abre una nueva vía de enfoque de estas parasitosis en cuanto al establecimiento de estrategias comunes para un control más racional de las mismas


Subject(s)
Humans , Chagas Disease/immunology , Leishmaniasis/immunology , Immunity, Cellular , Leishmania/immunology , Leishmaniasis, Mucocutaneous/immunology , Chagas Cardiomyopathy/immunology , Lymphocyte Activation , Trypanosoma cruzi/immunology
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