Undernutrition regulates the expression of a novel splice variant of myostatin and insulin-like growth factor 1 in ovine skeletal muscle
| Autor: | Ferenc Jeanplong, Shelley J. Falconer, Claire C. Osepchook, Jenny M. Oldham, Heather K. Smith, J J Bass, Christopher D. McMahon |
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| Rok vydání: | 2015 |
| Předmět: |
endocrine system
medicine.medical_specialty medicine.medical_treatment Sheep Diseases Myostatin Insulin-like growth factor Endocrinology Food Animals Internal medicine medicine Animals Protein Isoforms RNA Messenger Insulin-Like Growth Factor I Muscle Skeletal Messenger RNA Sheep biology Myogenesis Growth factor Malnutrition RNA Skeletal muscle musculoskeletal system medicine.anatomical_structure Gene Expression Regulation Mitogen-activated protein kinase biology.protein Female Animal Science and Zoology Food Deprivation Signal Transduction |
| Zdroj: | Domestic Animal Endocrinology. 52:17-24 |
| ISSN: | 0739-7240 |
| Popis: | Undernutrition suppresses the growth of skeletal muscles and alters the expression of insulin-like growth factor 1 (IGF1), a key mitogen, and myostatin, a potent inhibitor of myogenesis. These changes can explain, at least in part, the reduced growth of skeletal muscles in underfed lambs. We have recently identified a myostatin splice variant (MSV) that binds to and antagonizes the canonical signaling of myostatin. In the present study, we hypothesized that the expression of MSV would be reduced in conjunction with myostatin and IGF1 in response to underfeeding in skeletal muscles of sheep. Young growing ewes were fed either ad libitum or an energy-restricted diet (30% of maintenance requirements) for 28 d. This regime of underfeeding resulted in a 24% reduction in body mass (P < 0.001) and a 36% reduction in the mass of the semitendinosus muscles relative to controls (P < 0.001) by day 28. The concentrations of MSV and IGF1 messenger RNA (mRNA) were reduced (both P < 0.001), but myostatin mRNA was not altered in semitendinosus muscles. Unlike the reduced expression of mRNA, the abundance of MSV protein was increased (P < 0.05) and there was no change in the abundance of myostatin protein. Our results suggest that undernutrition for 28 d decreases the signaling of myostatin by increasing the abundance of MSV protein. Although this action may reduce the growth inhibitory activity of myostatin, it cannot prevent the loss of growth of skeletal muscles during undernutrition. |
| Databáze: | OpenAIRE |
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