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Department of Physiology and Biophysics, University of California, Irvine, California 92697
Received 23 April 1996; accepted in final form 13 August 1996.
Adams, G. R., and F. Haddad. The relationships among
IGF-1, DNA content, and protein accumulation during skeletal muscle hypertrophy. J. Appl. Physiol. 81(6):
2509-2516, 1996.
Insulin-like growth factor-1 (IGF-1) is known to
have anabolic effects on skeletal muscle cells. This study examined the
time course of muscle hypertrophy and associated IGF-1 peptide and mRNA
expression. Data were collected at 3, 7, 14, and 28 days after surgical
removal of synergistic muscles of both normal and hypophysectomized
(HX) animals. Overloading increased the plantaris (Plant) mass,
myofiber size, and protein-to-body weight ratio in both groups (normal
and HX; P < 0.05). Muscle IGF-1
peptide levels peaked at 3 (normal) and 7 (HX) days of overloading with
maximum 4.1-fold (normal) and 6.2-fold (HX) increases. Increases in
muscle IGF-1 preceded the hypertrophic response. Total DNA content of
the overloaded Plant increased in both groups. There was a strong
positive relationship between IGF-1 peptide and DNA content in the
overloaded Plant from both groups. These results indicate that
1) the muscles from rats with both
normal and severely depressed systemic levels of IGF-1 respond to
functional overload with an increase in local IGF-1 expression and
2) this elevated IGF-1 may be
contributing to the hypertrophy response, possibly via the mobilization
of satellite cells to provide increases in muscle DNA.
growth factors; somatomedin; hypophysectomy; functional overload; ribonuclease protection assay
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