Altered T cell signaling events caused by anti-CD4 monoclonal antibody in suppressing experimental autoimmune cardiomyopathy / 中国病理生理杂志

ABSTRACT

AIM:We examined the efficacy ofanti-L3T4 McAb in the T cell signaling pathway in treating ex-Derimental antoimmune cardiomyopathy in BALB/c mice,as a model of the autoimmune mechanism involved in human di-latedardiomyopathy(DCM).METHODS:ADP/ATP carrier peptides were used to induce autoimmune cardiomyopathy in BALB/c mice.Afier 3 months.anti-L3T4 McAb WaS administered to deplete CD4+ T ceHs in the mice.Real-time PCR were used to detect the expression of intracellular signaling molecules(p561ck,p59fyn and Zap-70)and cytokine production(IFN-r,IL-2 and IL-4)in T cells.The expression of CIM5 was determined by immunohistochemistry a-nalysis.RESULTS:Reduced expression of p561ck,p59fyn and Zap-70 and the reduced cytokine production of IFN-r, IL-2 and IL-4 in T cells of anti-IJ3T4-treated DCM mice were found.Also,the expression of CD45 in spleen T cells was significantiv decreased in the anti-L3T4-treated group.In contrast,immunization with irrelevant Ab did not protect the mice.the expression of T cell signaling molecules,CD45,and cytokine were not inhibited.CONCLUSION:Thesestudies provide direct evidenee that anti-L3T4 McAb can be all effective immunomodulator to T cell signal molecules and 8ubsequent cytokine production events in ADP/ATP carrier-induced DCM in BALB/c mice.