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Aerobic and resistance training dependent skeletal muscle plasticity in the colon-26 murine model of cancer cachexia. | LitMetric

Aerobic and resistance training dependent skeletal muscle plasticity in the colon-26 murine model of cancer cachexia.

Metabolism

Department of Nutrition, Food and Exercise Sciences, Florida State University, Tallahassee, FL, USA; The Center for Advancing Exercise and Nutrition Research on Aging, Florida State University, Tallahassee, FL, USA. Electronic address:

Published: May 2016

AI Article Synopsis

  • - Using the colon-26 mouse model of cancer cachexia, researchers studied the effects of aerobic training (like running) versus resistance training (like climbing) on skeletal muscle responses in older mice.
  • - Both training methods failed to prevent weight loss due to cancer, but aerobic training showed benefits such as maintaining physical function and potentially improving muscle mass despite the cancer's effects.
  • - The study highlighted that aerobic training led to greater activation of important signaling pathways and muscle growth factors, indicating a more favorable response compared to resistance training in the context of cancer cachexia.

Article Abstract

Purpose: The appropriate mode of exercise training for cancer cachexia is not well-established. Using the colon-26 (C26) mouse model of cancer cachexia, we defined and compared the skeletal muscle responses to aerobic and resistance training.

Methods: Twelve-month old Balb/c mice were initially assigned to control, aerobic training (AT; wheel running), or resistance training (RT; ladder climbing) (n=16-17/group). After 8weeks of training, half of each group was injected with C26 tumor cells, followed by 3 additional weeks of training. Body composition and neuromuscular function was evaluated pre- and post-training. Muscles were collected post-training and analyzed for fiber cross-sectional area (CSA), Akt-mTOR signaling, and expression of insulin-like growth factor-I (IGF-I) and myogenic regulatory factors.

Results: Total body mass decreased (p<0.05) in C26 (-8%), AT+C26 (-18%), and RT+C26 (-15%) but not control. Sensorimotor function declined (p<0.05) in control (-16%), C26 (-13%), and RT+C26 (-23%) but not AT+C26. Similarly, strength/body weight decreased (p<0.05) in control (-7%), C26 (-21%), and RT+C26 (-10%) but not AT+C26. Gastrocnemius mass/body weight tended to be greater in AT+C26 vs. C26 (+6%, p=0.09). Enlargement of the spleen was partially corrected in AT+C26 (-27% vs. C26, p<0.05). Fiber CSA was lower in all C26 groups vs. control (-32% to 46%, p<0.05); however, the effect size calculated from C26 and AT+C26 was large (+24%, d=1.04). Phosphorylated levels of mTOR in AT+C26 exceeded C26 (+32%, p<0.05). RT+C26 showed greater mRNA expression (p<0.05) of IGF-IEa (+79%) and myogenin (+126%) with a strong tendency for greater IGF-IEb (+127%, p=0.069) vs.

Conclusions: Aerobic or resistance training was unable to prevent tumor-induced body weight loss. However, aerobic training may have preserved function, reduced the inflammatory response of the spleen, and marginally rescued muscle mass possibly through activation of mTOR. Aerobic training may therefore have therapeutic value for patients with cancer cachexia. In contrast, resistance training induced the expression of genes associated with muscle damage and repair. This gene response may be supportive of excessive stress generated by high resistance loading in a tumor-bearing state.

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Source
http://dx.doi.org/10.1016/j.metabol.2016.01.014DOI Listing

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