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12.02.2019 | ORIGINAL ARTICLE

Activation of T Lymphocytes as a Novel Mechanism in Beta1-Adrenergic Receptor Autoantibody-Induced Cardiac Remodeling

Zeitschrift:
Cardiovascular Drugs and Therapy
Autoren:
Yunhui Du, Xiao Li, Haicun Yu, Li Yan, Wayne Bond Lau, Shihan Zhang, Yanwen Qin, Wen Wang, Xinliang Ma, Huirong Liu, Michael Fu
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s10557-019-06856-2) contains supplementary material, which is available to authorized users.

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Abstract

Background

Numerous studies have reported significantly elevated titers of serum autoantibody against the second extracellular loop of β1-adrenoceptor (β1-AA), a catecholamine-like substance with β1-adrenergic activity, in patients with heart failure. Although evidence demonstrates that this autoantibody may alter T cell proliferation and secretion, the role of T lymphocytes in heart failure induced by β1-AA remains unclear. The current study was designed to determine whether T cell disorder contributes to heart failure induced by β1-AA.

Methods and Results

β1-AA monoclonal antibodies (β1-AAmAb) produced using the hybridoma technique were administered in wild-type mice or T lymphocyte deficiency nudes for 12 weeks. T lymphocytes from heart failure patients and neonatal cardiomyocytes were utilized in vitro. Mouse protein antibody array analysis was employed to detect the cytokines responsible for β1-AAmAb-induced heart failure. Compared to wild-type mice, T lymphocyte deficiency mice prevented cardiac function from getting worse, attenuated adverse remodeling, and ameliorated cardiomyocyte apoptosis and fibrosis. As shown by protein array, the serum level of interleukin (IL)-6 was significantly lower in the nude group as compared to wild-type after β1-AAmAb treatment. Mechanistic studies in vitro demonstrated that T lymphocyte culture supernatants stimulated by β1-AAmAb caused direct damage in the cardiomyocytes, and β1-AAmAb promoted proliferation of T lymphocytes isolated from patients with heart failure and increased IL-6 release. IL-6-specific siRNA virtually abolished cardiomyocyte apoptosis, suggesting that IL-6 may be a key cytokine released by T lymphocytes and responsible for β1-AAmAb-induced cardiac remodeling.

Conclusions

Collectively, we demonstrate that β1-AAmAb-induced cardiac remodeling via mediating T lymphocyte disorder and releasing a variety of IL-6.

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10557_2019_6856_MOESM1_ESM.docx
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