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Class II MHC antigens in normal human skeletal muscle
C Cifuentes-Diaz1, C Delaporte, B Dautréaux
1CNRS UA 614, Paris, France.
Muscle & Nerve
|March 1, 1992
Summary
Human skeletal muscle cells, including satellite cells and myotubes, express Class II Major Histocompatibility Complex (MHC) antigens. This suggests these cells may synthesize these important immune molecules.
Area of Science:
- Immunology
- Cell Biology
- Muscle Physiology
Background:
- Class II Major Histocompatibility Complex (MHC) antigens play crucial roles in immune responses.
- Their expression in human skeletal muscle tissue and cells is not fully understood.
Purpose of the Study:
- To investigate the presence and localization of Class II MHC antigens in normal human skeletal muscle.
- To determine if skeletal muscle cells synthesize these antigens.
Main Methods:
- Light and electron immunocytochemistry techniques were employed.
- Analysis was performed on both intact muscle tissue and cultured muscle cells.
- Specific antibodies targeting HLA class II isotypes (DP, DQ, DR) were used.
Main Results:
- Class II MHC antigens were detected in satellite cells, interstitial cells, and blood vessels within muscle tissue.
- In cultured cells, mononucleated cells and myotubes showed positive staining for Class II MHC antigens.
- Staining intensity varied among isotypes, with DR and DQ being more prominent than DP.
- Subcellular localization included the cell surface, endoplasmic reticulum, and cytosol.
- Evidence suggested de novo synthesis of these antigens after myoblast fusion.
Conclusions:
- Normal human skeletal muscle cells, including myosatellite cells and cultured muscle cells, express Class II MHC antigens.
- The presence of these antigens on myotubes and intracellularly suggests synthesis by muscle cells post-fusion.
- These findings have implications for understanding immune interactions within skeletal muscle.