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Testosterone and trenbolone enanthate increase mature myostatin protein expression despite increasing skeletal muscle hypertrophy and satellite cell number in rodent muscle

journal contribution
posted on 2018-07-02, 00:00 authored by Vincent DalboVincent Dalbo, MD Roberts, CB Mobley, C Ballmann, WC Kephart, CD Fox, VA Santucci, CF Conover, LA Beggs, A Balaez
The androgen-induced alterations in adult rodent skeletal muscle fibre cross-sectional area (fCSA), satellite cell content and myostatin (Mstn) were examined in 10-month-old Fisher 344 rats (n = 41) assigned to Sham surgery, orchiectomy (ORX), ORX + testosterone (TEST; 7.0 mg week−1) or ORX + trenbolone (TREN; 1.0 mg week−1). After 29 days, animals were euthanised and the levator ani/bulbocavernosus (LABC) muscle complex was harvested for analyses. LABC muscle fCSA was 102% and 94% higher in ORX + TEST and ORX + TREN compared to ORX (p <.001). ORX + TEST and ORX + TREN increased satellite cell numbers by 181% and 178% compared to ORX, respectively (p <.01), with no differences between conditions for myonuclear number per muscle fibre (p =.948). Mstn protein was increased 159% and 169% in the ORX + TEST and ORX + TREN compared to ORX (p <.01). pan-SMAD2/3 protein was ~30–50% greater in ORX compared to SHAM (p =.006), ORX + TEST (p =.037) and ORX + TREN (p =.043), although there were no between-treatment effects regarding phosphorylated SMAD2/3. Mstn, ActrIIb and Mighty mRNAs were lower in ORX, ORX + TEST and ORX + TREN compared to SHAM (p <.05). Testosterone and trenbolone administration increased muscle fCSA and satellite cell number without increasing myonuclei number, and increased Mstn protein levels. Several genes and signalling proteins related to myostatin signalling were differentially regulated by ORX or androgen therapy. © 2016 Blackwell Verlag GmbH

Funding

Other

History

Volume

49

Issue

3

Start Page

1

End Page

11

Number of Pages

11

eISSN

1439-0272

ISSN

0303-4569

Publisher

Wiley-Blackwell, Germany

Peer Reviewed

  • Yes

Open Access

  • No

Acceptance Date

2016-03-29

External Author Affiliations

Auburn University, Geriatric Research Education and Clinical Center, University of Florida, Veterinary Diagnostic Pathology, College of Osteopathic Medicine-Auburn Cam, USA

Era Eligible

  • Yes

Journal

Andrologia

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