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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 PLoS+One
2016 ; 11
(3
): e0151845
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Cardiovascular Protective Effect of Metformin and Telmisartan: Reduction of PARP1
Activity via the AMPK-PARP1 Cascade
#MMPMID26986624
Shang F
; Zhang J
; Li Z
; Zhang J
; Yin Y
; Wang Y
; Marin TL
; Gongol B
; Xiao H
; Zhang YY
; Chen Z
; Shyy JY
; Lei T
PLoS One
2016[]; 11
(3
): e0151845
PMID26986624
show ga
Hyperglycemia and hypertension impair endothelial function in part through
oxidative stress-activated poly (ADP-ribose) polymerase 1 (PARP1). Biguanides and
angiotensin II receptor blockers (ARBs) such as metformin and telmisartan have a
vascular protective effect. We used cultured vascular endothelial cells (ECs),
diabetic and hypertensive rodent models, and AMPK?2-knockout mice to investigate
whether metformin and telmisartan have a beneficial effect on the endothelium via
AMP-activated protein kinase (AMPK) phosphorylation of PARP1 and thus inhibition
of PARP1 activity. The results showed that metformin and telmisartan, but not
glipizide and metoprolol, activated AMPK, which phosphorylated PARP1 Ser-177 in
cultured ECs and the vascular wall of rodent models. Experiments using
phosphorylated/de-phosphorylated PARP1 mutants show that AMPK phosphorylation of
PARP1 leads to decreased PARP1 activity and attenuated protein
poly(ADP-ribosyl)ation (PARylation), but increased endothelial nitric oxide
synthase (eNOS) activity and silent mating type information regulation 2 homolog
1 (SIRT1) expression. Taken together, the data presented here suggest biguanides
and ARBs have a beneficial effect on the vasculature by the cascade of AMPK
phosphorylation of PARP1 to inhibit PARP1 activity and protein PARylation in ECs,
thereby mitigating endothelial dysfunction.
|AMP-Activated Protein Kinases/*drug effects/physiology
[MESH]