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Gonad-related factors promote muscle performance gain during postnatal development in male and female mice

Ueberschlag-Pitiot, V and Stantzou, A and Messéant, J and Lemaitre, M and Owens, DJ and Noirez, P and Roy, P and Agbulut, O and Metzger, D and Ferry, A (2017) Gonad-related factors promote muscle performance gain during postnatal development in male and female mice. American Journal of Physiology - Endocrinology And Metabolism, 313 (1). E12-E25. ISSN 0193-1849

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Abstract

To better define the role of male and female gonad-related factors (MGRF, presumably testosterone, and FGRF, presumably estradiol, respectively) on mouse hindlimb skeletal muscle contractile performance/function gain during postnatal development, we analyzed the effect of castration initiated before puberty in male and female mice. We found that muscle absolute and specific (normalized to muscle weight) maximal forces were decreased in 6-mo-old male and female castrated mice compared with age- and sex-matched intact mice, without alteration in neuromuscular transmission. Moreover, castration decreased absolute and specific maximal powers, another important aspect of muscle performance, in 6-mo-old males, but not in females. Absolute maximal force was similarly reduced by castration in 3-mo-old muscle fiber androgen receptor (AR)-deficient and wild-type male mice, indicating that the effect of MGRF was muscle fiber AR independent. Castration reduced the muscle weight gain in 3-mo mice of both sexes and in 6-mo females but not in males. We also found that bone morphogenetic protein signaling through Smad1/5/9 was not altered by castration in atrophic muscle of 3-mo-old mice of both sexes. Moreover, castration decreased the sexual dimorphism regarding muscle performance. Together, these results demonstrated that in the long term, MGRF and FGRF promote muscle performance gain in mice during postnatal development, independently of muscle growth in males, largely via improving muscle contractile quality (force and power normalized), and that MGFR and FGRF also contribute to sexual dimorphism. However, the mechanisms underlying MGFR and FGRF actions remain to be determined.

Item Type: Article
Uncontrolled Keywords: 06 Biological Sciences, 11 Medical And Health Sciences
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Divisions: Sport & Exercise Sciences
Publisher: American Physiological Society
Date Deposited: 10 Nov 2017 10:51
Last Modified: 10 Nov 2017 10:51
DOI or Identification number: 10.1152/ajpendo.00446.2016
URI: http://researchonline.ljmu.ac.uk/id/eprint/7509

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