Abstract:
:The serine protease thrombin has been proposed to be involved in neuromuscular plasticity. Its specific receptor "protease activated receptor-1" (PAR-1), a G protein-coupled receptor, has been shown to be expressed in myoblasts but not after fusion (Suidan et al., 1996 J Biol Chem 271:29162-29169). In the present work we have investigated the expression of PAR-1 during rat skeletal muscle differentiation both in vitro and in vivo. Primary cultures of rat foetal skeletal muscle, characterized by their spontaneous contractile activity, were used for exploration of PAR-1 by RT-PCR, immunocytochemistry and Western blotting. Our results show that PAR-1 mRNA and protein are both present in myoblasts and myotubes. Incubation of myotubes loaded with fluo-3-AM in presence of thrombin (200 nM) or PAR-1 agonist peptide (SFLLRN, 500 microM), induced the intracellular release of calcium indicating the activation of PAR-1. Blockade of contractile activity by tetrodotoxin (TTX, 6 nM) did not modify either PAR-1 synthesis or its cellular localization. Investigation of PAR-1 on rat muscle cryostat sections at Day 18 of embryogenesis and postnatal Days 1, 5, and 10 indicated that this protein is first expressed in the cytoplasm and that it later localizes to the membrane. Moreover, its expression correlates with myosin heavy chain transitions occurring during post-natal period and is restricted to primary fibers. Taken together, these results suggest that PAR-1 expression is not related to contractile activity but to myogenic differentiation.
journal_name
J Cell Physioljournal_title
Journal of cellular physiologyauthors
Chevessier F,Hantaï D,Verdière-Sahuqué Mdoi
10.1002/jcp.10009keywords:
subject
Has Abstractpub_date
2001-11-01 00:00:00pages
152-61issue
2eissn
0021-9541issn
1097-4652pii
10.1002/jcp.10009journal_volume
189pub_type
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