Pro-remodeling effect of autoantibody against ß1-adrenoceptor on cardiomyocytes involves T cells dysfunction under the pathological condition of heart failure.

Autoantibody against ß1-adrenoceptor (ß1-AA) has been shown to be closely linked to the aggravation of heart failure. Removal of ß1-AA remarkably attenuated patients' cardiac dysfunction. We found that ß1-AA induced rat heart failure with increased CD4+ T cells. However, whether or not ß1-AA interacts with T cells isolated from heart failure patients remains unknown. Twenty-one ß1-AA-negative heart failure patients were divided into those taking ß-adrenergic blocker and those not. The effects of ß1-AA monoclonal antibodies (ß1-AAmAb) on T cells proliferation were detected using the CCK-8 assay. IFN-γ and IL-4 production by human T cells were measured by after the administration of ß1-AAmAb. The levels of cardiomyocyte apoptosis and hypertrophy were detected after co-cultured with the supernatant of T cells pre-stimulated by ß1-AAmAb. It was found that ß1-AAmAb promoted T cell proliferation via the ß1-AR/cAMP/PKA pathway in patients who not take ß-blocker. ß1-AAmAb inhibited the characteristic cytokine secretion of Th1, IFN-γ, but had no significant effect on the Th2 cytokine IL-4. Supernatant resulted from the T cells pre-treated with ß1-AAmAb induced cardiomyocytes remodeling, as evidenced by increased levels of cardiomyocytes apoptosis and hypertrophy. We propose that heart failure is likely to be an interference factor for Th-mediated immunity, and the presence of ß1-AAmAb may aggravate this effect and deteriorate concomitant inflammatory injury in cardiomyocytes, partially via ß1-AR/cAMP/PKA pathway.