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2015 ; 9
(ä): 6043-54
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Attenuation of myocardial fibrosis with curcumin is mediated by modulating
expression of angiotensin II AT1/AT2 receptors and ACE2 in rats
#MMPMID26648693
Pang XF
; Zhang LH
; Bai F
; Wang NP
; Garner RE
; McKallip RJ
; Zhao ZQ
Drug Des Devel Ther
2015[]; 9
(ä): 6043-54
PMID26648693
show ga
Curcumin is known to improve cardiac function by balancing degradation and
synthesis of collagens after myocardial infarction. This study tested the
hypothesis that inhibition of myocardial fibrosis by curcumin is associated with
modulating expression of angiotensin II (Ang II) receptors and
angiotensin-converting enzyme 2 (ACE2). Male Sprague Dawley rats were subjected
to Ang II infusion (500 ng/kg/min) using osmotic minipumps for 2 and 4 weeks,
respectively, and curcumin (150 mg/kg/day) was fed by gastric gavage during Ang
II infusion. Compared to the animals with Ang II infusion, curcumin significantly
decreased the mean arterial blood pressure during the course of the observation.
The protein level of the Ang II type 1 (AT1) receptor was reduced, and the Ang II
type 2 (AT2) receptor was up-regulated, evidenced by an increased ratio of the
AT2 receptor over the AT1 receptor in the curcumin group (1.2±0.02%) vs in the
Ang II group (0.7±0.03%, P<0.05). These changes were coincident with less locally
expressed AT1 receptor and enhanced AT2 receptor in the intracardiac vessels and
intermyocardium. Along with these modulations, curcumin significantly decreased
the populations of macrophages and alpha smooth muscle actin-expressing
myofibroblasts, which were accompanied by reduced expression of transforming
growth factor beta 1 and phosphorylated-Smad2/3. Collagen I synthesis was
inhibited, and tissue fibrosis was attenuated, as demonstrated by less extensive
collagen-rich fibrosis. Furthermore, curcumin increased protein level of ACE2 and
enhanced its expression in the intermyocardium relative to the Ang II group.
These results suggest that curcumin could be considered as an add-on therapeutic
agent in the treatment of fibrosis-derived heart failure patient who is
intolerant of ACE inhibitor therapy.