Dihydrotestosterone treatment rescues the decline in protein synthesis as a result of sarcopenia in isolated mouse skeletal muscle fibres

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dc.cclicenceCC-BY-NCen
dc.contributor.authorWendowski, Oskaren
dc.contributor.authorRedshaw, Zoeen
dc.contributor.authorMutungi, Gabrielen
dc.date.acceptance2016-04-05en
dc.date.accessioned2016-07-01T10:42:44Z
dc.date.available2016-07-01T10:42:44Z
dc.date.issued2016-04-25
dc.descriptionOpen Access article
dc.description.abstractBackground Sarcopenia, the progressive decline in skeletal muscle mass and function with age, is a debilitating condition. It leads to inactivity, falls, and loss of independence. Despite this, its cause(s) and the underlying mechanism(s) are still poorly understood. Methods In this study, small skeletal muscle fibre bundles isolated from the extensor digitorum longus (a fast-twitch muscle) and the soleus (a slow-twitch muscle) of adult mice of different ages (range 100–900 days old) were used to investigate the effects of ageing and dihydrotestosterone (DHT) treatment on protein synthesis as well as the expression and function of two amino acid transporters; the sodium-coupled neutral amino acid transporter (SNAT) 2, and the sodium-independent Ltype amino-acid transporter (LAT) 2. Results At all ages investigated, protein synthesis was always higher in the slow-twitch than in the fast-twitch muscle fibres and decreased with age in both fibre types. However, the decline was greater in the fast-twitch than in the slow-twitch fibres and was accompanied by a reduction in the expression of SNAT2 and LAT2 at the protein level. Again, the decrease in the expression of the amino acid transporters was greater in the fast-twitch than in the slow-twitch fibres. In contrast, ageing had no effect on SNAT2 and LAT2 expressions at the mRNA level. Treating the muscle fibre bundles with physiological concentrations (~2 nM) of DHT for 1 h completely reversed the effects of ageing on protein synthesis and the expression of SNAT2 and LAT2 protein in both fibre types. Conclusion From the observations that ageing is accompanied by a reduction in protein synthesis and transporter expression and that these effects are reversed by DHT treatment, we conclude that sarcopenia arises from an age-dependent reduction in protein synthesis caused, in part, by the lack of or by the low bioavailability of the male sex steroid, DHT. Keywords Sarcopenia; Ageing; Skeletal muscle; Protein synthesis; Amino acid transportersen
dc.exception.reasonopen access articleen
dc.explorer.multimediaNoen
dc.funderBBSRCen
dc.identifier.citationWendowski, O., Redshaw, Z. and Mutungi, G. (2016) Dihydrotestosterone treatment rescues the decline in protein synthesis as a result of sarcopenia in isolated mouse skeletal muscle fibres. Journal of Cachexia, Sarcopenia and Muscle. 8 (1), pp. 48-56en
dc.identifier.doihttps://doi.org/10.1002/jcsm.12122
dc.identifier.urihttp://hdl.handle.net/2086/12225
dc.language.isoenen
dc.peerreviewedYesen
dc.projectidBB/J01754X/1en
dc.publisherWileyen
dc.researchgroupBiomedical and Environmental Healthen
dc.researchinstituteInstitute for Allied Health Sciences Researchen
dc.subjectSkeletal muslceen
dc.subjectsarcopeniaen
dc.subjectageingen
dc.subjectprotein synthesisen
dc.subjectamino acid transportersen
dc.titleDihydrotestosterone treatment rescues the decline in protein synthesis as a result of sarcopenia in isolated mouse skeletal muscle fibresen
dc.typeArticleen

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