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2017 ; 174
(13
): 2140-2151
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Activation of AMP-activated protein kinase by metformin ablates angiotensin
II-induced endoplasmic reticulum stress and hypertension in mice in vivo
#MMPMID28436023
Duan Q
; Song P
; Ding Y
; Zou MH
Br J Pharmacol
2017[Jul]; 174
(13
): 2140-2151
PMID28436023
show ga
BACKGROUND AND PURPOSE: Metformin, one of the most frequently prescribed
medications for type 2 diabetes, reportedly exerts BP-lowering effects in
patients with diabetes. However, the effects and underlying mechanisms of
metformin on BP in non-diabetic conditions remain to be determined. The aim of
the present study was to determine the effects of metformin on angiotensin II
(Ang II) infusion-induced hypertension in vivo. EXPERIMENTAL APPROACH: The
effects of metformin on BP were investigated in wild-type (WT) C57BL/6J mice and
in mice lacking AMP-activated protein kinase ?2 (AMPK?2) mice with or without Ang
II infusion. Also, the effect of metformin on Ang II-induced endoplasmic
reticulum (ER) stress was explored in cultured human vascular smooth muscle cells
(hVSMCs). KEY RESULTS: Metformin markedly reduced BP in Ang II-infused WT mice
but not in AMPK?2-deficient mice. In cultured hVSMCs, Ang II treatment resulted
in inactivation of AMPK, as well as the subsequent induction of spliced X-box
binding protein-1, phosphorylation of eukaryotic translation initiation factor 2?
and expression of glucose-regulated protein 78 kDa, representing three
well-characterized ER stress biomarkers. Moreover, AMPK activation by metformin
ablated Ang II-induced ER stress in hVSMCs. Mechanistically, metformin-activated
AMPK?2 suppressed ER stress by increasing phospholamban phosphorylation.
CONCLUSION AND IMPLICATIONS: Metformin alleviates Ang II-triggered hypertension
in mice by activating AMPK?2, which mediates phospholamban phosphorylation and
inhibits Ang II-induced ER stress in vascular smooth muscle cells.
|AMP-Activated Protein Kinases/deficiency/*metabolism
[MESH]