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Salsalate activates brown adipose tissue in mice

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Author: Dam, A.D. van · Nahon, K.J. · Kooijman, S. · Berg, S.M. van den · Kanhai, A.A. · Kikuchi, T. · Heemskerk, M.M. · Harmelen,V. van · Lombès, M. · Hoek,A.M. van den · Winther, M.P. de · Lutgens, E. · Guigas, B. · Rensen, P.C. · Boon, M.R.
Type:article
Date:2015
Source:Diabetes, 5, 64, 1544-1554
Identifier: 526477
doi: doi:10.2337/db14-1125
Keywords: Biology · Salicylic acid derivative · Salsalate · Administration and dosage · Adverse effects · Brown adipose tissue · Drug administration · Drug effects · Fat intake · Metabolism · Mouse · Physiology · Transgenic mouse · Adipose Tissue, Brown · Animals · Dietary Fats · Drug Administration Schedule · Glucose · Lipid Metabolism · Male · Mice · Mice, Transgenic · Obesity · Salicylates · Weight Gain · Biomedical Innovation · Healthy Living · Life · MHR - Metabolic Health Research · ELSS - Earth, Life and Social Sciences

Abstract

Salsalate improves glucose intolerance and dyslipidemia in type 2 diabetes patients, but the mechanism is still unknown. The aim of the current study was to unravel the molecular mechanisms involved in these beneficial metabolic effects of salsalate by treating mice with salsalate during and after development of high-fat diet-induced obesity. We found that salsalate attenuated and reversed high-fat diet-induced weight gain, in particular fat mass accumulation, improved glucose tolerance, and lowered plasma triglyceride levels. Mechanistically, salsalate selectively promoted the uptake of fatty acids from glycerol tri[(3)H]oleate-labeled lipoprotein-like emulsion particles by brown adipose tissue (BAT), decreased the intracellular lipid content in BAT, and increased rectal temperature, all pointing to more active BAT. The treatment of differentiated T37i brown adipocytes with salsalate increased uncoupled respiration. Moreover, salsalate upregulated Ucp1 expression and enhanced glycerol release, a dual effect that was abolished by the inhibition of cAMP-dependent protein kinase (PKA). In conclusion, salsalate activates BAT, presumably by directly activating brown adipocytes via the PKA pathway, suggesting a novel mechanism that may explain its beneficial metabolic effects in type 2 diabetes patients.