Journal
JOURNAL OF PHYSIOLOGY-LONDON
Volume 588, Issue 2, Pages 341-351Publisher
WILEY
DOI: 10.1113/jphysiol.2009.179325
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Funding
- Danish Medical Research Council [271-07-0742]
- Danish National Research Board
- Novo-Nordisk Foundation
- Lundbeck Foundation
- Nordea Foundation
- Danish Anti-Doping Foundation
- Team Denmark [33241979-06]
- Eva and Henry Fraenkels Memorial Foundation
- UK BBSRC [BB/X510697/1, BB/C516779/1]
- EC
- Clinical Institute at Aarhus University Hospital
- Danish Rheumatism Association
- Biotechnology and Biological Sciences Research Council [BB/C516779/1] Funding Source: researchfish
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In skeletal muscle and tendon the extracellular matrix confers important tensile properties and is crucially important for tissue regeneration after injury. Musculoskeletal tissue adaptation is influenced by mechanical loading, which modulates the availability of growth factors, including growth hormone (GH) and insulin-like growth factor-I (IGF-I), which may be of key importance. To test the hypothesis that GH promotes matrix collagen synthesis in musculotendinous tissue, we investigated the effects of 14 day administration of 33-50 mu g kg(-1) day(-1) recombinant human GH (rhGH) in healthy young individuals. rhGH administration caused an increase in serum GH, serum IGF-I, and IGF-I mRNA expression in tendon and muscle. Tendon collagen I mRNA expression and tendon collagen protein synthesis increased by 3.9-fold and 1.3-fold, respectively (P < 0.01 and P = 0.02), and muscle collagen I mRNA expression and muscle collagen protein synthesis increased by 2.3-fold and 5.8-fold, respectively (P < 0.01 and P = 0.06). Myofibrillar protein synthesis was unaffected by elevation of GH and IGF-I. Moderate exercise did not enhance the effects of GH manipulation. Thus, increased GH availability stimulates matrix collagen synthesis in skeletal muscle and tendon, but without any effect upon myofibrillar protein synthesis. The results suggest that GH is more important in strengthening the matrix tissue than for muscle cell hypertrophy in adult human musculotendinous tissue.
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