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Stem Cells International
Volume 2016, Article ID 6729268, 9 pages
http://dx.doi.org/10.1155/2016/6729268
Research Article

Spontaneous Physical Activity Downregulates Pax7 in Cancer Cachexia

1DAHFMO Unit of Histology and Medical Embryology, Interuniversity Institute of Myology, Sapienza University of Rome, Via Scarpa 14, 00161 Rome, Italy
2Department of Biological Adaptation and Ageing B2A (CNRS UMR 8256, INSERM ERL U1164, UPMC P6), Pierre et Marie Curie University (Paris 6), 75005 Paris, France
3Biology, Molecular Medicine and Nano-Biotechnologies Institute, C.N.R., Biology and Biotechnologies Department, Sapienza University of Rome, 00185 Rome, Italy
4Gynaecological Oncology, Oncology Department, KU Leuven, Herestraat 49, 3000 Leuven, Belgium
5Department of Kinesiology, Research Group in Exercise Physiology, KU Leuven, Tervuursevest 101, P.O. Box 1500, 3001 Leuven, Belgium

Received 7 July 2015; Revised 2 September 2015; Accepted 4 September 2015

Academic Editor: Gary E. Lyons

Copyright © 2016 Dario Coletti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Emerging evidence suggests that the muscle microenvironment plays a prominent role in cancer cachexia. We recently showed that NF-kB-induced Pax7 overexpression impairs the myogenic potential of muscle precursors in cachectic mice, suggesting that lowering Pax7 expression may be beneficial in cancer cachexia. We evaluated the muscle regenerative potential after acute injury in C26 colon carcinoma tumor-bearing mice and healthy controls. Our analyses confirmed that the delayed muscle regeneration observed in muscles form tumor-bearing mice was associated with a persistent local inflammation and Pax7 overexpression. Physical activity is known to exert positive effects on cachectic muscles. However, the mechanism by which a moderate voluntary exercise ameliorates muscle wasting is not fully elucidated. To verify if physical activity affects Pax7 expression, we hosted control and C26-bearing mice in wheel-equipped cages and we found that voluntary wheel running downregulated Pax7 expression in muscles from tumor-bearing mice. As expected, downregulation of Pax7 expression was associated with a rescue of muscle mass and fiber size. Our findings shed light on the molecular basis of the beneficial effect exerted by a moderate physical exercise on muscle stem cells in cancer cachexia. Furthermore, we propose voluntary exercise as a physiological tool to counteract the overexpression of Pax7 observed in cancer cachexia.