Volume 16, Issue 4 pp. 367-379
RESEARCH ARTICLE

Nandrolone supplementation does not improve functional recovery in an aged animal model of volumetric muscle loss injury

John T. Kim

John T. Kim

Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas, USA

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Kevin Roberts

Kevin Roberts

Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas, USA

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Grady Dunlap

Grady Dunlap

Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas, USA

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Richard Perry

Richard Perry

Department of Health, Human Performance, and Recreation, College of Education and Health Professions, University of Arkansas, Fayetteville, Arkansas, USA

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Tyrone Washington

Tyrone Washington

Department of Health, Human Performance, and Recreation, College of Education and Health Professions, University of Arkansas, Fayetteville, Arkansas, USA

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Jeffrey C. Wolchok

Corresponding Author

Jeffrey C. Wolchok

Department of Biomedical Engineering, University of Arkansas, Fayetteville, Arkansas, USA

Correspondence

Jeffrey C. Wolchok, Department of Biomedical Engineering, University of Arkansas, John A. White, Jr. Engineering Hall, Suite 120, Fayetteville, AR 72701, USA.

Email: [email protected]

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First published: 03 February 2022
Citations: 7

Abstract

Aging hinders the effectiveness of regenerative medicine strategies targeting the repair of volumetric muscle loss (VML) injury. Anabolic steroids have been shown to improve several factors which contribute to the age-related decline in muscle's regenerative capacity. In this study, the impact of exogenous nandrolone decanoate (ND) administration on the effectiveness of a VML regenerative repair strategy was explored using an aged animal model. Unilateral tibialis anterior VML injuries were repaired in 18-month-aged animal models (male Fischer 344 rat) using decellularized human skeletal muscle scaffolds supplemented with autologous minced muscle. The contralateral limb was left untreated/uninjured. Following repair, ND(+) or a carrier control (ND−) was delivered via weekly injection for a period of 8 weeks. At 8 weeks, muscle isometric torque, gene expression, and tissue structure were assessed. ND(+) treatment did not improve contractile torque recovery following VML repair when compared to carrier only ND(−) injection controls. Peak isometric torque in the ND(+) VML repair group remained significantly below contralateral uninjured control values (4.69 ± 1.18vs. 7.46 ± 1.53 N mm/kg) and was statistically indistinguishable from carrier only ND(−) VML repair controls (4.47 ± 1.18 N mm/kg). Gene expression for key myogenic genes (Pax7, MyoD, MyoG, IGF-1) were not significantly elevated in response to ND injection, suggesting continued age related myogenic impairment even in the presence of ND(+) treatment. ND injection did reduce the histological appearance of fibrosis at the site of VML repair, and increased expression of the collagen III gene, suggesting some positive effects on repair site matrix regulation. Overall, the results presented in this study suggest that a decline in regenerative capacity with aging may present an obstacle to regenerative medicine strategies targeting VML injury and that the delivery of anabolic stimuli via ND administration was unable to overcome this decline.

CONFLICT OF INTEREST

The authors have declared that there is no conflict of interes

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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