TY - JOUR

T1 - IL-6 regulates exercise and training-induced adaptations in subcutaneous adipose tissue in mice

AU - Brandt, Claus

AU - Jakobsen, Anne Hviid

AU - Hassing, Helle Adser

AU - Olesen, Jes

AU - Iversen, N.

AU - Kristensen, Jonas Møller

AU - Hojman, P.

AU - Wojtaszewski, Jørgen

AU - Hidalgo, J.

AU - Pilegaard, Henriette

N1 - CURIS 2012 5200 006

PY - 2012

Y1 - 2012

N2 - Aim: The aim of this study was to test the hypothesis that IL-6 regulates exercise-induced gene responses in subcutaneous adipose tissue in mice. Methods: Four months old male IL-6 whole body knockout (KO) mice and C57B wild-type (WT) mice performed 1h of treadmill exercise, where subcutaneous adipose tissue (AT) was removed either immediately after, 4h or 10h after exercise as well as from mice not running acutely. Moreover, AT was sampled at resting conditions after 5 weeks of exercise training. Results: AT leptin mRNA decreased immediately after a single running exercise bout in both genotypes, and returned to baseline within 10h of recovery in IL-6 KO mice, but not WT mice. Leptin mRNA content decreased in WT and increased in IL-6 KO mice with training, but without significant alterations in leptin protein. Acute exercise induced a decrease in the AT TNFa mRNA content in WT, but not in IL-6-KO mice, while training lowered resting levels of TNFa mRNA in both genotypes. In addition, an exercise-induced decline in AT PPAR¿ mRNA content was absent in IL-6 KO mice and in line training increased PPAR¿ mRNA only in IL-6 KO mice. Conclusion: The present findings indicate a role for IL-6 in regulating exercise and training-induced leptin and PPAR¿ expression in adipose tissue. In addition, while IL-6 is required for TNF-a mRNA reduction in response to acute exercise, IL-6 does not appear to be mandatory for anti-inflammatory effects of exercise training in adipose tissue.

AB - Aim: The aim of this study was to test the hypothesis that IL-6 regulates exercise-induced gene responses in subcutaneous adipose tissue in mice. Methods: Four months old male IL-6 whole body knockout (KO) mice and C57B wild-type (WT) mice performed 1h of treadmill exercise, where subcutaneous adipose tissue (AT) was removed either immediately after, 4h or 10h after exercise as well as from mice not running acutely. Moreover, AT was sampled at resting conditions after 5 weeks of exercise training. Results: AT leptin mRNA decreased immediately after a single running exercise bout in both genotypes, and returned to baseline within 10h of recovery in IL-6 KO mice, but not WT mice. Leptin mRNA content decreased in WT and increased in IL-6 KO mice with training, but without significant alterations in leptin protein. Acute exercise induced a decrease in the AT TNFa mRNA content in WT, but not in IL-6-KO mice, while training lowered resting levels of TNFa mRNA in both genotypes. In addition, an exercise-induced decline in AT PPAR¿ mRNA content was absent in IL-6 KO mice and in line training increased PPAR¿ mRNA only in IL-6 KO mice. Conclusion: The present findings indicate a role for IL-6 in regulating exercise and training-induced leptin and PPAR¿ expression in adipose tissue. In addition, while IL-6 is required for TNF-a mRNA reduction in response to acute exercise, IL-6 does not appear to be mandatory for anti-inflammatory effects of exercise training in adipose tissue.

U2 - 10.1111/j.1748-1716.2011.02373.x

DO - 10.1111/j.1748-1716.2011.02373.x

M3 - Journal article

C2 - 21991887

VL - 205

SP - 224

EP - 235

JO - Acta Physiologica

JF - Acta Physiologica

SN - 1748-1708

IS - 2

ER -