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2016 ; 7
(42
): 67828-67840
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Renal denervation attenuates aldosterone expression and associated cardiovascular
pathophysiology in angiotensin II-induced hypertension
#MMPMID27661131
Hong MN
; Li XD
; Chen DR
; Ruan CC
; Xu JZ
; Chen J
; Wu YJ
; Ma Y
; Zhu DL
; Gao PJ
Oncotarget
2016[Oct]; 7
(42
): 67828-67840
PMID27661131
show ga
The sympathetic nervous system interacts with the renin-angiotensin-aldosterone
system (RAAS) contributing to cardiovascular diseases. In this study, we sought
to determine if renal denervation (RDN) inhibits aldosterone expression and
associated cardiovascular pathophysiological changes in angiotensin II (Ang
II)-induced hypertension. Bilateral RDN or SHAM operation was performed before
chronic 14-day Ang II subcutaneous infusion (200ng/kg/min) in male Sprague-Dawley
rats. Bilateral RDN blunted Ang II-induced hypertension and ameliorated the
mesenteric vascular dysfunction. Cardiovascular hypertrophy in response to Ang II
was significantly attenuated by RDN as shown by histopathology and transthoracic
echocardiography. Moreover, Ang II-induced vascular and myocardial inflammation
and fibrosis were suppressed by RDN with concurrent decrease in fibronectin and
collagen deposition, macrophage infiltration, and MCP-1 expression.
Interestingly, RDN also inhibited Ang II-induced aldosterone expression in the
plasma, kidney and heart. This was associated with the reduction of calcitonin
gene-related peptide (CGRP) in the adrenal gland. Ang II promoted aldosterone
secretion which was partly attenuated by CGRP in the adrenocortical cell line,
suggesting a protective role of CGRP in this model. Activation of transforming
growth factor-? (TGF-?)/Smad and mitogen-activated protein kinases (MAPKs)
signaling pathway was both inhibited by RDN especially in the heart. These
results suggest that the regulation of the renal sympathetic nerve in Ang
II-induced hypertension and associated cardiovascular pathophysiological changes
is likely mediated by aldosterone, with CGRP involvement.