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Expression and localization of RAP1 proteins during myogenic differentiation
V Pizon1, C Cifuentes-Diaz, R M Mège
1Laboratoire de Génétique et Biologie Moléculaire de la Réplication, CNRS-UPR 9044, Villejuif/France.
European Journal of Cell Biology
|March 1, 1996
Summary
RAP1 proteins are regulated during skeletal muscle development. Their expression and localization change during myogenesis, suggesting a role in muscle differentiation and specialized cell junctions.
Area of Science:
- Molecular Biology
- Cell Biology
- Developmental Biology
Background:
- Small GTPases, including the RAP1 subfamily, are implicated in cellular differentiation.
- Evidence suggests small GTPases play a role in skeletal muscle development and myogenesis.
Purpose of the Study:
- To investigate the regulation of RAP1 (RAP1A and RAP1B) transcripts and proteins during myogenic differentiation.
- To determine the intracellular localization and in vivo relevance of RAP1 proteins in skeletal muscle development.
Main Methods:
- Northern blot analysis of C2 myogenic cells.
- Immunofluorescence microscopy of C2 cells and primary mouse myotubes.
- Analysis of RAP1 protein expression and localization during in vivo skeletal muscle development.
Main Results:
- RAP1B gene transcription was down-regulated, while RAP1A mRNA was continuously expressed during C2 cell differentiation.
- RAP1 proteins accumulated in differentiated C2 cells and mouse myotubes, localizing to late endocytic compartments.
- In vivo, RAP1 proteins accumulated at the neuromuscular and myotendinous junctions during skeletal muscle development.
Conclusions:
- RAP1 proteins are specifically regulated during myogenic differentiation.
- RAP1 protein accumulation and localization suggest a role in the development of specialized muscle cell domains.
- The findings indicate a significant involvement of RAP1 proteins in myogenesis and skeletal muscle maturation.