Increased expression of neuregulin-1 in differentiating muscle satellite cells and in motoneurons during muscle regeneration.

Abstract:

:Neuregulins belong to a family of multipotent growth-promoting proteins, and have been shown to have a crucial role in accumulating acetylcholine receptor at neuromuscular junctions. A functional role of neuregulins in muscle regeneration has not yet been identified. Using reverse transcription (RT)-PCR, Western blot and immunofluorescence analysis following bupivacaine injection into rat muscle, we investigated the expression pattern of neuregulin-1 (NRG-1) in normal and regenerating tibialis anterior (TA) muscle. In addition, we examined changes in NRG-1 expression in the spinal cord following muscle damage. Western blotting showed that muscle NRG-1 protein decreased soon after the damage, and increased gradually after the 4th day following the damage. The amount of NRG-1 mRNA in the muscle increased from the 2nd to 6th post-surgical day. The amount of NRG-1 protein, but not mRNA, increased gradually in the spinal cord after muscle damage. Immunofluorescence revealed NRG-1 protein in some quiescent satellite cells identified by c-Met. After 6 and 10 days, clear co-localization between NRG-1 and myogenin was noted in differentiating satellite cells. Thus, NRG-1 may play an important role in the differentiation of satellite cells in muscle regeneration, while increased NRG-1 expression in motoneurons may enhance the remodeling of partially damaged axons.

journal_name

Acta Neuropathol

journal_title

Acta neuropathologica

authors

Hirata M,Sakuma K,Okajima S,Fujiwara H,Inashima S,Yasuhara M,Kubo T

doi

10.1007/s00401-007-0198-5

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

451-9

issue

4

eissn

0001-6322

issn

1432-0533

journal_volume

113

pub_type

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