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The effects of acute and chronic exercise on PGC ‐1α, irisin and browning of subcutaneous adipose tissue in humans
Author(s) -
Norheim Frode,
Langleite Torgrim Mikal,
Hjorth Marit,
Holen Torgeir,
Kielland Anders,
Stadheim Hans Kristian,
Gulseth Hanne Løvdal,
Birkeland Kåre Inge,
Jensen Jørgen,
Drevon Christian A.
Publication year - 2014
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/febs.12619
Subject(s) - fndc5 , medicine , endocrinology , myokine , adipose tissue , white adipose tissue , endurance training , skeletal muscle , type 2 diabetes , diabetes mellitus , muscle tissue , biology , extracellular matrix , fibronectin , microbiology and biotechnology
Irisin was first identified as a peroxisome proliferator‐activated receptor γ co‐activator‐1α (PGC‐1α) dependent myokine with the potential to induce murine brown‐fat‐like development of white adipose tissue. In humans, the regulatory effect of training on muscle FNDC5 mRNA expression and subsequently irisin levels in plasma is more controversial. We recruited 26 inactive men (13 normoglycaemic and normal weight, controls; and 13 slightly hyperglycaemic and overweight, pre‐diabetes group) aged 40–65 years for a 12‐week intervention of combined endurance and strength training with four sessions of training per week. Before and after the 12‐week intervention period, participants were exposed to an acute endurance workload of 45 min at 70% of VO 2max , and muscle biopsies were taken prior to and after exercise. Skeletal muscle mRNA for PGC1A and FNDC5 correlated and both PGC1A and FNDC5 mRNA levels increased after 12 weeks of training in both control and pre‐diabetes subjects. Circulating irisin was reduced in response to 12 weeks of training, and was increased acutely (~1.2‐fold) just after acute exercise. Plasma concentration of irisin was higher in pre‐diabetes subjects compared with controls. There was little effect of 12 weeks of training on selected browning genes in subcutaneous adipose tissue. UCP1 mRNA did not correlate with FNDC5 expression in subcutaneous adipose tissue or skeletal muscle or with irisin levels in plasma. We observed no enhancing effect of long‐term training on circulating irisin levels, and little or no effect of training on browning of subcutaneous white adipose tissue in humans.