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Abstract
Muscle regeneration was induced by transplanting the extensor digitorum longus (EDL)
muscle in adult rats to examine the effect of X-irradiation on muscle regeneration.
The EDL muscles were removed, irradiated with X-rays to administer 650 R, 2 000 R
or 10 000 R, and transplanted into the original animal and location. Muscles from
non-irradiated control group and each irradiated group were analyzed morphologically
at 4, 7, 14 and 30 days post-transplantation. The regeneration pattern in the non-irradiated
and 650-R irradiated muscles was similar. A majority of myofibers underwent degeneration
followed by regeneration from the precursor myosatellite cells. The myosatellite cells
proliferated, differentiated into myoblasts and then fused to form myotubes and myofibers.
Muscles exposed to 2 000 R underwent initial degeneration and myosatellite cell activation,
however, considerably fewer myotubes regenerated in these muscles. In muscles exposed
to 10 000 R, again myofiber degeneration and myosatellite cell activation was evident,
but these cells remained undifferentiated and did not fuse to form myotubes. These
results show a dose-dependent inhibition in muscle regeneration due to irradiation.
Keywords
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Article info
Publication history
Accepted:
September 16,
1986
Received in revised form:
September 16,
1986
Received:
June 10,
1986
Identification
Copyright
© 1987 Published by Elsevier Inc.