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de Boer MP, Meijer RI, Richter EA, van Nieuw Amerongen GP, Sipkema P, van Poelgeest EM, Aman J, Kokhuis TJA, Koolwijk P, van Hinsbergh VWM, Smulders YM, Serné EH, Eringa EC. Globular adiponectin controls insulin-mediated vasoreactivity in muscle through AMPKα2. Vascul Pharmacol 2015; 78:24-35. [PMID: 26363472 DOI: 10.1016/j.vph.2015.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 08/18/2015] [Accepted: 09/08/2015] [Indexed: 12/23/2022]
Abstract
Decreased tissue perfusion increases the risk of developing insulin resistance and cardiovascular disease in obesity, and decreased levels of globular adiponectin (gAdn) have been proposed to contribute to this risk. We hypothesized that gAdn controls insulin's vasoactive effects through AMP-activated protein kinase (AMPK), specifically its α2 subunit, and studied the mechanisms involved. In healthy volunteers, we found that decreased plasma gAdn levels in obese subjects associate with insulin resistance and reduced capillary perfusion during hyperinsulinemia. In cultured human microvascular endothelial cells (HMEC), gAdn increased AMPK activity. In isolated muscle resistance arteries gAdn uncovered insulin-induced vasodilation by selectively inhibiting insulin-induced activation of ERK1/2, and the AMPK inhibitor compound C as well as genetic deletion of AMPKα2 blunted insulin-induced vasodilation. In HMEC deletion of AMPKα2 abolished insulin-induced Ser(1177) phosphorylation of eNOS. In mice we confirmed that AMPKα2 deficiency decreases insulin sensitivity, and this was accompanied by decreased muscle microvascular blood volume during hyperinsulinemia in vivo. This impairment was accompanied by a decrease in arterial Ser(1177) phosphorylation of eNOS, which closely related to AMPK activity. In conclusion, globular adiponectin controls muscle perfusion during hyperinsulinemia through AMPKα2, which determines the balance between NO and ET-1 activity in muscle resistance arteries. Our findings provide a novel mechanism linking reduced gAdn-AMPK signaling to insulin resistance and impaired organ perfusion.
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Affiliation(s)
- Michiel P de Boer
- Department of Internal Medicine, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Rick I Meijer
- Department of Internal Medicine, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Erik A Richter
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Geerten P van Nieuw Amerongen
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Pieter Sipkema
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Erik M van Poelgeest
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Jurjan Aman
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Tom J A Kokhuis
- Department of Biomedical Engineering, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Pieter Koolwijk
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Victor W M van Hinsbergh
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Yvo M Smulders
- Department of Internal Medicine, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Erik H Serné
- Department of Internal Medicine, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands
| | - Etto C Eringa
- Laboratory for Physiology, VU University Medical Center, Amsterdam, The Netherlands; Institute for Cardiovascular Research (ICaR-VU), VU University Medical Center, Amsterdam, The Netherlands.
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