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The hypotensive effect of acute and chronic AMP-activated protein kinase activation in normal and hyperlipidemic mice.

Abstract：

:AMP-activated protein kinase (AMPK) is present in the arterial wall and is activated in response to cellular stressors that raise AMP relative to ADP/ATP. Activation of AMPK in vivo lowers blood pressure but the influence of hyperlipidemia on this response has not been studied. ApoE(-/-) mice on high fat diet for 6weeks and age-matched controls were treated with the AMPK activator, AICAR daily for two weeks. Under anesthesia, the carotid artery was cannulated for blood pressure measurements. Aortic tissue was removed for in vitro functional experiments and AMPK activity was measured in artery homogenates by Western blotting. ApoE(-/-) mice had significantly raised mean arterial pressure; chronic AICAR treatment normalized this but had no effect in normolipidemic mice, whereas acute administration of AICAR lowered mean arterial pressure in both groups. Chronic AICAR treatment increased phosphorylation of AMPK and its downstream target acetyl-CoA carboxylase in normolipidemic but not ApoE(-/-) mice. In aortic rings, AMPK activation induced vasodilation and an anticontractile effect, which was attenuated in ApoE(-/-) mice. This study demonstrates that hyperlipidemia dysregulates the AMPK pathway in the arterial wall but this effect can be reversed by AMPK activation, possibly through improving vessel compliance.

journal_name

Vascul Pharmacol

journal_title

Vascular pharmacology

authors

Greig FH,Ewart MA,McNaughton E,Cooney J,Spickett CM,Kennedy S

doi

10.1016/j.vph.2015.07.010

subject

Has Abstract

pub_date

2015-11-01 00:00:00

pages

93-102

eissn

1537-1891

issn

1879-3649

pii

S1537-1891(15)00169-X

journal_volume

74

pub_type

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