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Rev. Fac. Cienc. Méd. (Córdoba) ; 63(3): 47-52, 2006. ilus, tab
Article in Spanish | LILACS | ID: lil-474459

ABSTRACT

En sangre de chagásicos en trabajos previos se halló un número alto de linfocitos T productores de substancia P.A.S.- positiva, más numerosos en chagásicos con electrocardiograma anormal. Luego los hallamos infiltrados en el corazón chagásico. En este trabajo consideramos nuestra hipótesis de que esa substancia linfocitaria sería Interferongamma. Material y Métodos. Muestras de corazones de 8 chagásicos fallecidos por muerte cardiaca. Se utilizaron anticuerpos monoclonales anti-IFN gamma humano; para linfocitos T activados (CD45 ROJ, y la reacción del P.A.S, respectivamente. Las células positivas se contaron en 50 campos a 400x y el estado de miocardio se comparó con datos clínicos. También. en frotis de sangre de pacientes chagásicos con ECG anormal, investigamos inmunomarcación con anti interferon gamma y la P.A.S.-positividad, respectivamente. Resultados El mayor número de células infiltrantes intracardiacas (65-75%) resultaron positivos para IFN gamma, y similares valores para P.A.S.-positividad y para CD45 RO. En sangre hallamos 41 % ±7 de linfocitos P.A.S.-positivos: y similar de positivos para IFN-gamma. Conclusiones: Los datos muestran que los linfocitos P.A.S.-positivos de los chagásicos producen IFN-gamma tanto en sangre. Como infiltrados en tejidos cardíacos. e indican una fuerte respuesta T-helper l. También explican la gran afluencia de macrófagos en dichos tejidos cardíacos. No se vieron parásitos T. cruzi ni formas intracelulares. Esos hechos refuerzan los datos que indican existencia de autoinmunidad en Chagas. Abrimos una pregunta: ¿a que antígeno/s responden en el corazón chagásico los linfocitos T P.A.S.-positivos productores de IFN-gamma?


In the blood of chagasic patients, a high number of T-lymphocytes producers of a P.A.S.-positive substance was found, more numerous in chagasics with abnormal electrocardiogram. Further. We found such lymphocytes infiltrated in the chagasic heart. Here, we considered our hypothesis that those lymphocytes would be Interferon -gamma producer' cells. Material and Methods: Heart samples of 8 patients deceased due to chagasic heart disease (ChHD). Cuts of 5 microns were submitted to monoclonal antibodies for human Interferon-gamma; to CD45RO for activated T lymphocytes; and to the classical Periodic acid Schiff reaction (P.A.S.), respectively. In blood smears from chagasic patients with ChHD, the reactivity for anti Interferon gamma and for the P.A.S. reaction was compared, regarding the respective positive cell number. The myocardium status was compared with clinical date. Results: In hearts, 65-75% of infiltrated lymphocytes were positive for IFN-gamma; similar values were found, in seriated cuts, of P.A.S.-positive lymphocytes, as well as of CD45RO+. In blood, there were 41 % ±9 of P.A.S.positive lymphocytes, similar to positive cells for IFN-gamma. Conclusions: The data indicates that the P.A.S.-positive lymphocytes from chagasic patients are producers of IFN gamma in blood, as well as when infiltrated into the cardiac tissues. Such fact explains also the great affluence of macrophages in cardiac tissues in ChHD. The data indicate a strong response of T helper 1 type in this severe advanced stage of Chagas'disease. Either Trypanosome cruzi parasites or intracellular forms were seen in these hearts. This favours the data showing autoimmune mechanisms in this process. We open a question: to which antigen/s respond in the chagasic hearts the lymphocytes producers of IFN gamma?


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Chagas Cardiomyopathy/pathology , Interferon-gamma/biosynthesis , Myocardium/pathology , T-Lymphocytes/physiology , Antibodies, Monoclonal/immunology , /immunology , Chagas Cardiomyopathy/immunology , Immunohistochemistry , Interferon-gamma/blood , Myocardium/immunology , T-Lymphocytes/cytology , T-Lymphocytes/immunology
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