Abstract:
:The role of motor innervation and muscle tension in the posthatching maturation of the slow-tonic anterior latissimus dorsi (ALD) muscle of the chicken has been investigated. Modification of the muscle tension was obtained either by maintaining ALD in a shortened state or by stretching, after or without denervation. In denervated as well as in innervated ALD, shortening resulted in atrophy and inhibition of developmental change in muscle fiber population. In contrast, stretch causes hypertrophy, transformation of all 3B fibers, increase in SM2 isomyosin expression, and decrease in Ca2+-activated myosin ATPase in innervated or denervated ALD. On the other hand oxidative activity in ALD fibers was strikingly reduced after denervation even in presence of stretch-induced hypertrophy. This study suggests that a passive stretch can be involved in some, but not all, changes in ALD characteristics occurring after denervation and may be also involved in normal posthatching development of the slow-tonic muscle. Possible clinical implications of these results in relation to treatments for preventing muscle atrophy resulting from immobilization or disuse are suggested.
journal_name
Muscle Nervejournal_title
Muscle & nerveauthors
Gardahaut MF,Rouaud TP,Renaud D,Khaskiye A,Le Douarin GHdoi
10.1002/mus.880121112subject
Has Abstractpub_date
1989-11-01 00:00:00pages
943-52issue
11eissn
0148-639Xissn
1097-4598journal_volume
12pub_type
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