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Circulating insulin stimulates fatty acid retention in white adipose tissue via KATP channel activation in the central nervous System only in insulin-sensitive mice

Author: Coomans, C.P. · Geerling, J.J. · Guigas, B. · Hoek, A.M. van den · Parlevliet, E.T. · Ouwens, D.M. · Pijl, H. · Voshol, P.J. · Rensen, P.C.N. · Havekes, L.M. · Romijn, J.A.
Type:article
Date:2011
Institution: Gaubius Instituut TNO
Source:Journal of Lipid Research, 9, 52, 1712-1722
Identifier: 436000
doi: doi:10.1194/jlr.M015396
Keywords: Health Biology · Brain · Brown adipose tissue · Insulin resistance · Lipid metabolism · Lipoprotein lipase · Triglycerides · adenosine triphosphate sensitive potassium channel · CD36 antigen · cyclic AMP · fatty acid · insulin · leptin · serum albumin · tolbutamide · triacylglycerol · animal experiment · animal model · animal tissue · brown adipose tissue · central nervous system · channel gating · controlled study · drug administration route · drug distribution · drug half life · drug targeting · fatty acid metabolism · fatty acid retention · hormone action · hyperinsulinemia · insulin action · insulin sensitivity · male · mouse · nonhuman · signal transduction · white adipose tissue · wild type · Life · MHR - Metabolic Health Research · EELS - Earth, Environmental and Life Sciences

Abstract

Insulin signaling in the central nervous system (CNS) is required for the inhibitory effect of insulin on glucose production. Our aim was to determine whether the CNS is also involved in the stimulatory effect of circulating insulin on the tissue-specific retention of fatty acid (FA) from plasma. In wild-type mice, hyperinsulinemic-euglycemic clamp conditions stimulated the retention of both plasma triglyceride-derived FA and plasma albumin-bound FA in the various white adipose tissues (WAT) but not in other tissues, including brown adipose tissue (BAT). Intracerebroventricular (ICV) administration of insulin induced a similar pattern of tissue-specific FA partitioning. This effect of ICV insulin administration was not associated with activation of the insulin signaling pathway in adipose tissue. ICV administration of tolbutamide, a KATP channel blocker, considerably reduced (during hyperinsulinemic-euglycemic clamp conditions) and even completely blocked (during ICV administration of insulin) WAT-specific retention of FA from plasma. This central effect of insulin was absent in CD36-deficient mice, indicating that CD36 is the predominant FA transporter in insulin-stimulated FA retention by WAT. In diet-induced insulin-resistant mice, these stimulating effects of insulin (circulating or ICV administered) on FA retention in WAT were lost. In conclusion, in insulin-sensitive mice, circulating insulin stimulates tissue-specific partitioning of plasma-derived FA in WAT in part through activation of KATP channels in the CNS. Apparently, circulating insulin stimulates fatty acid uptake in WAT but not in BAT, directly and indirectly through the CNS. Copyright © 2011 by the American Society for Biochemistry and Molecular Biology, Inc.