The effect of caloric restriction on the forelimb skeletal muscle fibers of the hypertrophic myostatin null mice

Elashry, Mohamed I.; Matsakas, Antonios; Wenisch, Sabine; Arnhold, Stefan; Patel, Ketan

Abstract

Skeletal muscle mass loss has a broad impact on body performance and physical activity. Muscle wasting occurs due to genetic mutation as in muscular dystrophy, age-related muscle loss (sarcopenia) as well as in chronic wasting disorders as in cancer cachexia. Food restriction reduces muscle mass underpinned by increased muscle protein break down. However the influence of dietary restriction on the morphometry and phenotype of forelimb muscles in a genetically modified myostatin null mice are not fully characterized. The effect of a five week dietary limitation on five anatomically and structurally different forelimb muscles was examined. C57/BL6 wild type (Mstn+/+) and myostatin null (Mstn−/−) mice were either given a standard rodent normal daily diet ad libitum (ND) or 60% food restriction (FR) for a 5 week period. M. triceps brachii Caput laterale (T.lateral), M. triceps brachii Caput longum (T.long), M. triceps brachii Caput mediale (T.medial), M. extensor carpi ulnaris (ECU) and M. flexor carpi ulnaris (FCU) were dissected, weighted and processed for immunohistochemistry. Muscle mass, fibers cross sectional areas (CSA) and myosin heavy chain types IIB, IIX, IIA and type I were analyzed. We provide evidence that caloric restriction results in muscle specific weight reduction with the fast myofibers being more prone to atrophy. We show that slow fibers are less liable to dietary restriction induced muscle atrophy. The effect of dietary restriction was more pronounced in Mstn−/− muscles to implicate the oxidative fibers compared to Mstn+/+. Furthermore, peripherally located myofibers are more susceptible to dietary induced reduction compared to deep fibers. We additionally report that dietary restriction alters the glycolytic phenotype of the Mstn−/− into the oxidative form in a muscle dependent manner. In summary our study shows that calorie restriction alters muscle fiber profile of forelimb muscles of Myostatin null mice.

Citation

Elashry, M. I., Matsakas, A., Wenisch, S., Arnhold, S., & Patel, K. (2017). The effect of caloric restriction on the forelimb skeletal muscle fibers of the hypertrophic myostatin null mice. Acta Histochemica, 119(5), 582-591. https://doi.org/10.1016/j.acthis.2017.06.002

• Journal Article Type: Article
• Acceptance Date: Jun 5, 2017
• Online Publication Date: Jun 15, 2017
• Publication Date: Jun 1, 2017
• Deposit Date: Jul 19, 2017
• Publicly Available Date: Jun 15, 2018
• Journal: Acta histochemica
• Print ISSN: 0065-1281
• Electronic ISSN: 1618-0372
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 119
• Issue: 5
• Pages: 582-591
• DOI: https://doi.org/10.1016/j.acthis.2017.06.002
• Keywords: Food restriction; Myosin heavy chain; Myostatin; Skeletal muscle
• Public URL: https://hull-repository.worktribe.com/output/453646
• Publisher URL: http://www.sciencedirect.com/science/article/pii/S0065128117301289?via%3Dihub
• Additional Information: This article is maintained by: Elsevier; Article Title: The effect of caloric restriction on the forelimb skeletal muscle fibers of the hypertrophic myostatin null mice; Journal Title: Acta Histochemica; CrossRef DOI link to publisher maintained version: http://dx.doi.org/10.1016/j.acthis.2017.06.002; Content Type: article; Copyright: © 2017 Elsevier GmbH. All rights reserved.