Abstract:
:During lipid oversupply, the heart becomes insulin resistant, as exemplified by defective insulin-stimulated glucose uptake, and will develop diastolic dysfunction. In the healthy heart, not only insulin, but also increased contractile activity stimulates glucose uptake. Upon increased contraction both AMP-activated protein kinase (AMPK) and protein kinase D (PKD) are activated, and mediate the stimulation of glucose uptake into cardiomyocytes. Therefore, each of these kinases is a potential therapeutic target in the diabetic heart because they may serve to bypass defective insulin-stimulated glucose uptake. To test the preventive potential of these kinases against loss of insulin-stimulated glucose uptake, AMPK or PKD were adenovirally overexpressed in primary cultures of insulin resistant cardiomyocytes for assaying substrate uptake, insulin responsiveness and lipid accumulation. To induce insulin resistance and lipid loading, rat primary cardiomyocytes were cultured in the presence of high insulin (100 nM; HI) or high palmitate (palmitate/BSA: 3/1; HP). HI and HP each reduced insulin responsiveness, and increased basal palmitate uptake and lipid storage. Overexpression of each of the kinases prevented loss of insulin-stimulated glucose uptake. Overexpression of AMPK also prevented loss of insulin signaling in HI- and HP-cultured cardiomyocytes, but did not prevent lipid accumulation. In contrast, overexpression of PKD prevented lipid accumulation, but not loss of insulin signaling in HI- and HP-cultured cardiomyocytes. In conclusion, AMPK and PKD prevent loss of insulin-stimulated glucose uptake into cardiomyocytes cultured under insulin resistance-inducing conditions through different mechanisms. This article is part of a Special Issue entitled "Focus on Cardiac Metabolism".
journal_name
J Mol Cell Cardioljournal_title
Journal of molecular and cellular cardiologyauthors
Steinbusch LK,Dirkx E,Hoebers NT,Roelants V,Foretz M,Viollet B,Diamant M,van Eys G,Ouwens DM,Bertrand L,Glatz JF,Luiken JJdoi
10.1016/j.yjmcc.2012.11.005subject
Has Abstractpub_date
2013-02-01 00:00:00pages
165-73eissn
0022-2828issn
1095-8584pii
S0022-2828(12)00406-3journal_volume
55pub_type
杂志文章abstract::The mitochondrial permeability transition, an established mechanism for heart diseases, is a long-standing mystery of mitochondrial biology and a prime drug target for cardioprotection. Several hypotheses about its molecular nature have been put forward over the years, and the prevailing view is that permeabilization ...
journal_title:Journal of molecular and cellular cardiology
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pub_type: 杂志文章,评审
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journal_title:Journal of molecular and cellular cardiology
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journal_title:Journal of molecular and cellular cardiology
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journal_title:Journal of molecular and cellular cardiology
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journal_title:Journal of molecular and cellular cardiology
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doi:10.1016/0022-2828(90)90089-k
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journal_title:Journal of molecular and cellular cardiology
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journal_title:Journal of molecular and cellular cardiology
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pub_type: 杂志文章
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pub_type: 杂志文章,评审
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