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2018 ; 9
(3
): 406
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Decreased autophagy induced by ?(1)-adrenoceptor autoantibodies contributes to
cardiomyocyte apoptosis
#MMPMID29540670
Wang L
; Li Y
; Ning N
; Wang J
; Yan Z
; Zhang S
; Jiao X
; Wang X
; Liu H
Cell Death Dis
2018[Mar]; 9
(3
): 406
PMID29540670
show ga
It has been recognized that myocardial apoptosis is one major factor in the
development of heart dysfunction and autophagy has been shown to influence the
apoptosis. In previous studies, we reported that anti-?(1)-adrenergic receptor
autoantibodies (?(1)-AABs) decreased myocardial autophagy, but the role of
decreased autophagy in cardiomyocyte apoptosis remains unclear. In the present
study, we used a ?(1)-AAB-immunized rat model to investigate the role of
decreased autophagy in cardiomyocyte apoptosis. We reported that the level of
autophagic flux increased early and then decreased in an actively
?(1)-AAB-immunized rat model. Rapamycin, an mTOR inhibitor, restored myocardial
apoptosis in the presence of ?(1)-AABs. Further, we found that the early increase
of autophagy was an adaptive stress response that is possibly unrelated to
?(1)-AR, and the activation of the ?(1)-AR and PKA contributed to late decreased
autophagy. Then, after upregulating or inhibiting autophagy with rapamycin, Atg5
overexpression adenovirus or 3-methyladenine in cultured primary neonatal rat
cardiomyocytes, we found that autophagy decline promoted myocardial apoptosis
effectively through the mitochondrial apoptotic pathway. In conclusion, the
reduction of apoptosis through the proper regulation of autophagy may be
important for treating patients with ?(1)-AAB-positive heart dysfunction.