AMP-activated protein kinase inhibits angiotensin II-stimulated vascular smooth muscle cell proliferation.

Abstract:

BACKGROUND:AMP-activated protein kinase (AMPK) is a stress-activated protein kinase that works as a metabolic sensor of cellular ATP levels. Here, we investigated whether AMPK signaling has a role in the regulation of the angiotensin II (Ang II)-induced proliferation signal in rat vascular smooth muscle cells (VSMCs). METHODS AND RESULTS:Aminoimidazole-4-carboxamide-1-beta-ribofuranoside (AICAR) activated AMPK in rat VSMCs and inhibited Ang II-induced extracellular signal-regulated kinase 1/2 phosphorylation but not that of p38 MAPK or Akt/PKB. Although Ang II activated AMPK, this activation was significantly inhibited by catalase, N-acetylcysteine, and diphenyleneiodonium chloride, an NADPH oxidase inhibitor. Moreover, the observation that AMPK was activated by H2O2 suggests that AMPK is redox sensitive. The Ang II type 1 receptor antagonist valsartan but not the Ang II type 2 receptor antagonist PD123319 significantly inhibited Ang II-induced AMPK activation, suggesting that Ang II-induced AMPK activation was Ang II type 1 receptor dependent. Whereas 3H-thymidine incorporation by VSMCs treated with Ang II was significantly inhibited when the cells were pretreated with 1 mmol/L AICAR, the inhibition of AMPK by dominant-negative AMPK overexpression augmented Ang II-induced cell proliferation. Subcutaneous injection of AICAR (1 mg/g body weight per day) for 2 weeks suppressed neointimal formation after transluminal mechanical injury of the rat femoral artery. CONCLUSIONS:Our findings indicate that Ang II-induced AMPK activation is synchronized with extracellular signal-regulated kinase signaling and that AMPK works as an inhibitor of the Ang II proliferative pathway. AMPK signaling might serve as a new therapeutic target of vascular remodeling in cardiovascular diseases.

journal_name

Circulation

journal_title

Circulation

authors

Nagata D,Takeda R,Sata M,Satonaka H,Suzuki E,Nagano T,Hirata Y

doi

10.1161/01.CIR.0000136025.96811.76

subject

Has Abstract

pub_date

2004-07-27 00:00:00

pages

444-51

issue

4

eissn

0009-7322

issn

1524-4539

pii

01.CIR.0000136025.96811.76

journal_volume

110

pub_type

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