Chronic activation of AMP-activated protein kinase prevents 20-hydroxyeicosatetraenoic acid-induced endothelial dysfunction
dc.contributor.author | Ward, Natalie | |
dc.contributor.author | Chen, K. | |
dc.contributor.author | Li, C. | |
dc.contributor.author | Croft, K. | |
dc.contributor.author | Keaney, J. | |
dc.date.accessioned | 2017-01-30T13:11:13Z | |
dc.date.available | 2017-01-30T13:11:13Z | |
dc.date.created | 2016-01-19T20:00:32Z | |
dc.date.issued | 2011 | |
dc.identifier.citation | Ward, N. and Chen, K. and Li, C. and Croft, K. and Keaney, J. 2011. Chronic activation of AMP-activated protein kinase prevents 20-hydroxyeicosatetraenoic acid-induced endothelial dysfunction. Clinical and Experimental Pharmacology and Physiology. 38 (5): pp. 328-333. | |
dc.identifier.uri | http://hdl.handle.net/20.500.11937/29238 | |
dc.identifier.doi | 10.1111/j.1440-1681.2011.05509.x | |
dc.description.abstract |
20-Hydroxyeicosatetraenoic acid (20-HETE) is a potent vasoconstrictor involved in vascular dysfunction and blood pressure regulation. Studies have revealed strong associations between 20-HETE and endothelial dysfunction; however, the signalling mechanisms are largely unknown. Therefore, the aim of the present study was to investigate the effect of 20-HETE on the association between endothelial nitric oxide synthase (eNOS) and heat shock protein 90 (Hsp90). In mouse aortic rings, 20-HETE significantly enhanced the constriction to phenylephrine and inhibited the relaxation to acetylcholine (P = 0.05 vs control rings). In mice with chronic AMP-activated protein kinase (AMPK) activation, this protected against the negative effects of 20-HETE (P < 0.05). Immunoprecipitation of eNOS in human umbilical vein endothelial cells treated with 20-HETE revealed a decrease in basal and vascular endothelial growth factor-stimulated Hsp90 association with eNOS (P < 0.05). Pretreatment of cells with 5′-aminoimidazole-4-carboxyamide-ribonucleoside (AICAR; a chronic activator of AMPK) prevented the loss of Hsp90 association with eNOS following 20-HETE treatment. Treatment with 20-HETE for 24 h induced an increase in eNOS phosphorylation that was not seen following acute treatment (30 min). The increased eNOS phosphorylation was accompanied by transient changes in Akt phosphorylation. In conclusion, 20-HETE impairs eNOS–Hsp90 association, which can be reversed by chronic activation of AMPK. This provides a mechanism for reduced nitric oxide bioactivity and endothelial dysfunction in diseases with elevated 20-HETE levels, such as hypertension. | |
dc.title | Chronic activation of AMP-activated protein kinase prevents 20-hydroxyeicosatetraenoic acid-induced endothelial dysfunction | |
dc.type | Journal Article | |
dcterms.source.volume | 38 | |
dcterms.source.number | 5 | |
dcterms.source.startPage | 328 | |
dcterms.source.endPage | 333 | |
dcterms.source.issn | 0305-1870 | |
dcterms.source.title | Clinical and Experimental Pharmacology and Physiology | |
curtin.department | School of Biomedical Sciences | |
curtin.accessStatus | Fulltext not available |
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