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Elsevier, Life Sciences, (165), p. 100-108

DOI: 10.1016/j.lfs.2016.09.023

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Effects of physical exercise on myokines expression and brown adipose-like phenotype modulation in rats fed a high-fat diet

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

Aims: Exercise-stimulated myokine secretion into circulation may be related with browning in white adipose tissue (WAT), representing a positive metabolic effect on whole-body fat mass. However, limited information is yet available regarding the impact of exercise on myokine-related modulation of adipocyte phenotype in WAT from obese rats.Main methods: Sprague-Dawley rats (n = 60) were divided into sedentary and voluntary physical activity (VPA)groups and fed with standard (35 kcal% fat) or high-fat (HFD, 71 kcal% fat)-isoenergetic diets. The VPA-groupshad unrestricted access to wheel running throughout the protocol. After-9 weeks, half of sedentary standard(SS) and sedentary HFD (HS)-fed animals were exercised on treadmill (endurance training, ET) for 8-weekswhile maintaining the dietary treatments.Key findings: The adipocyte hypertrophy induced by HFD were attenuated by VPA and ET. HFD decreased 5apos; AMPactivated protein kinase (AMPK) activity in muscle as well as peroxisome proliferator-activated receptor gamma coactivator-1¿ (PGC-1¿) and uncoupling protein 1 (UCP1) proteins in eWAT, while not affecting circulating irisin. VPA increased eWAT Tmem26 mRNA levels in the standard diet-fed group, whereas ET increased AMPK, interleukin 6 (IL-6) and fibronectin type III domain-containing protein 5 (FNDC5) protein expression in muscle, but had no impact on circulating irisin protein content. In eWAT, ET increased bone morphogenetic protein 7 (Bmp7), Cidea and PGC-1¿ in both diet-fed animals, whereas BMP7, Prdm16, UCP1 and FNDC5 only in standard diet-fed group.Significance: Data suggest that ET-induced myokine production seems to contribute, at least in part, to the¿brown-like¿ phenotype in WAT from rats fed a HFD.