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Nerve control of type 2A MHC isoform expression in regenerating slow skeletal muscle
Author(s) -
Megighian Aram,
Germinario Elena,
Rossini Katia,
Midrio Menotti,
DanieliBetto Daniela
Publication year - 2001
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/1097-4598(200101)24:1<47::aid-mus5>3.0.co;2-4
Subject(s) - gene isoform , myosin , skeletal muscle , sciatic nerve , biology , anatomy , microbiology and biotechnology , medicine , neuroscience , chemistry , endocrinology , biochemistry , gene
Bupivacaine‐induced regeneration was studied in rat soleus muscle under several conditions, with the focus on type 2A and type 1 myosin heavy chain (MHC) isoform expression. In denervated muscles, type 1 was absent, whereas type 2A was widely expressed, a pattern of regeneration which appeared to be independent of fibrillation activity of the muscle. Both type 1 and type 2A isoforms were absent in muscles regenerated during tetrodotoxin (TTX) block of impulse conduction in the sciatic nerve, but type 2A was still present when the TTX block was associated with the vinblastine block of axoplasmic flow; vinblastine block alone caused the coexpression of type 1 and type 2A isoforms in the majority of fibers. These results suggest that axoplasmic flow carries some chemical factor that inhibits 2A MHC isoform expression. The results are also of clinical interest, contributing to the understanding of factors controlling muscle differentiation and adaptation. © 2001 John Wiley & Sons, Inc. Muscle Nerve 24: 47–53, 2001