Exercise training in obese rats does not induce browning at thermoneutrality and induces a muscle-like signature in brown adipose tissue

Aldiss, P., Lewis, J.E., Lupini, I., Bloor, I., Ramyar, C., Boocock, D.J. ORCID: 0000-0002-7333-3549, Miles, A.K. ORCID: 0000-0002-5388-938X, Ebling, F.J.P., Budge, H. and Symonds, M.E., 2020. Exercise training in obese rats does not induce browning at thermoneutrality and induces a muscle-like signature in brown adipose tissue. Frontiers in Endocrinology, 11: 97. ISSN 1664-2392

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Abstract

Aim: Exercise training elicits diverse effects on brown (BAT) and white adipose tissue (WAT) physiology in rodents housed below their thermoneutral zone (i.e., 28–32°C). In these conditions, BAT is chronically hyperactive and, unlike human residence, closer to thermoneutrality. Therefore, we set out to determine the effects of exercise training in obese animals at 28°C (i.e., thermoneutrality) on BAT and WAT in its basal (i.e., inactive) state.

Methods: Sprague-Dawley rats (n = 12) were housed at thermoneutrality from 3 weeks of age and fed a high-fat diet. At 12 weeks of age half these animals were randomized to 4-weeks of swim-training (1 h/day, 5 days per week). Following a metabolic assessment interscapular and perivascular BAT and inguinal (I)WAT were taken for analysis of thermogenic genes and the proteome.

Results: Exercise attenuated weight gain but did not affect total fat mass or thermogenic gene expression. Proteomics revealed an impact of exercise training on 2-oxoglutarate metabolic process, mitochondrial respiratory chain complex IV, carbon metabolism, and oxidative phosphorylation. This was accompanied by an upregulation of multiple proteins involved in skeletal muscle physiology in BAT and an upregulation of muscle specific markers (i.e., Myod1, CkM, Mb, and MyoG). UCP1 mRNA was undetectable in IWAT with proteomics highlighting changes to DNA binding, the positive regulation of apoptosis, HIF-1 signaling and cytokine-cytokine receptor interaction.

Conclusion: Exercise training reduced weight gain in obese animals at thermoneutrality and is accompanied by an oxidative signature in BAT which is accompanied by a muscle-like signature rather than induction of thermogenic genes. This may represent a new, UCP1-independent pathway through which BAT physiology is regulated by exercise training.

Item Type: Journal article
Publication Title: Frontiers in Endocrinology
Creators: Aldiss, P., Lewis, J.E., Lupini, I., Bloor, I., Ramyar, C., Boocock, D.J., Miles, A.K., Ebling, F.J.P., Budge, H. and Symonds, M.E.
Publisher: Frontiers Media
Date: 2020
Volume: 11
ISSN: 1664-2392
Identifiers:
NumberType
10.3389/fendo.2020.00097DOI
1298963Other
Rights: © 2020 Aldiss, Lewis, Lupini, Bloor, Chavoshinejad, Boocock, Miles, Ebling, Budge and Symonds. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Divisions: Schools > School of Science and Technology
Depositing User: Linda Sullivan
Date Added: 26 Mar 2020 12:02
Last Modified: 26 Mar 2020 12:02
URI: http://irep.ntu.ac.uk/id/eprint/39486

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