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2016 ; 6
(ä): 32430
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Proliferation in cardiac fibroblasts induced by ?1-adrenoceptor autoantibody and
the underlying mechanisms
#MMPMID27577254
Lv T
; Du Y
; Cao N
; Zhang S
; Gong Y
; Bai Y
; Wang W
; Liu H
Sci Rep
2016[Aug]; 6
(ä): 32430
PMID27577254
show ga
Chronic sustained stimulation of ?-adrenoceptor is closely related to cardiac
fibrosis which is bad for cardiac function. Growing evidence showed that the high
prevalence of ?1-adrenoceptor autoantibody (?1-AA) in the sera of patients with
various types of cardiovascular diseases decreased cardiac function. In the
current study, we demonstrated that ?1-AA impaired the cardiac function evaluated
by echocardiography and that ?1-AA triggered cardiac fibrosis in terms of
increased expression of ?-smooth muscle actin as the marker of myofibroblast and
collagen deposition in a passive ?1-AA immunized mice model during 16 weeks.
Further, we showed that ?1-AA activated ?1-AR/cAMP/PKA pathway and promoted
proliferation in primary cardiac fibroblasts through specific binding to ?1-AR
but not to ?2-AR. Moreover, ?1-AA was also likely to promote proliferation in
cardiac fibroblasts through activating p38MAPK and ERK1/2 as p38MAPK inhibitor
SB203580 and ERK1/2 inhibitor PD98059 partially reversed the proliferative
effect. The persistent activating signalling of PKA and P38MAPK in 1?h induced by
?1-AA was associated with lacking agonist-induced desensitization phenomena. The
conditioned medium from ?1-AA-stimulated cardiac fibroblasts induced
cardiomyocyte apoptosis, which indicated that ?1-AA changed the secretion of
cardiac fibroblasts contributing to cardiac injury. These findings will
contribute to our understanding of the pathological mechanisms of ?1-AA.