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Cellular and molecular mechanisms responsible for the action of testosterone on human skeletal muscle: a basis for illegal performance enhancement
Örebro University, School of Health and Medical Sciences. (RISPA)ORCID iD: 0000-0002-9831-0896
2008 (English)In: British Journal of Pharmacology, ISSN 0007-1188, E-ISSN 1476-5381, Vol. 154, no 3, p. 522-528Article in journal (Refereed) Published
Abstract [en]

The popularity of testosterone among drug users is due to its powerful effects on muscle strength and mass. Important mechanisms behind the myotrophic effects of testosterone were uncovered both in athletes using steroids for several years and in short-term controlled studies. Both long-term and short-term steroid usage accentuates the degree of fibre hypertrophy in human skeletal muscle by enhancing protein synthesis. A mechanism by which testosterone facilitates the hypertrophy of muscle fibres is the activation of satellite cells and the promotion of myonuclear accretion when existing myonuclei become unable to sustain further enhancement of protein synthesis. Interestingly, long-term steroid usage also enhances the frequency of fibres with centrally located myonuclei, which implies the occurrence of a high regenerative activity. Under the action of testosterone, some daughter cells generated by satellite cell proliferation may escape differentiation and return to quiescence, which help to replenish the satellite cell reserve pool. However, whether long-term steroid usage induces adverse effects of satellite cells remains unknown. Testosterone might also favour the commitment of pluripotent precursor cells into myotubes and inhibit adipogenic differentiation. The effects of testosterone on skeletal muscle are thought to be mediated via androgen receptors expressed in myonuclei and satellite cells. Some evidence also suggests the existence of an androgen-receptor-independent pathway. Clearly, testosterone abuse is associated with an intense recruitment of multiple myogenic pathways. This provides an unfair advantage over non-drug users. The long-term consequences on the regenerative capacity of skeletal muscle are unknown.

Place, publisher, year, edition, pages
Basingstoke: Nature Publ. Group , 2008. Vol. 154, no 3, p. 522-528
Keyword [en]
Androgens/adverse effects/*pharmacology, Athletic Performance/physiology, Doping in Sports, Humans, Muscle Strength/drug effects, Muscle; Skeletal/drug effects/metabolism, Receptors; Androgen/drug effects/metabolism, Substance Abuse Detection/methods, Testosterone/adverse effects/*pharmacology
National Category
Pharmaceutical Sciences Microbiology in the medical area
Research subject
Molecular Cellbiology
Identifiers
URN: urn:nbn:se:oru:diva-4752DOI: 10.1038/bjp.2008.118PubMedID: 18414389OAI: oai:DiVA.org:oru-4752DiVA, id: diva2:139051
Available from: 2008-11-24 Created: 2008-11-24 Last updated: 2018-01-13Bibliographically approved

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Kadi, Fawzi

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