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American Journal of Pathology, Vol 143, 1142-1149, Copyright © 1993 by American Society for Investigative Pathology

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Constitutive and cytokine-induced expression of human leukocyte antigens and cell adhesion molecules by human myotubes

D Michaelis, N Goebels and R Hohlfeld
Department of Neuroimmunology, Max Planck Institute, Martinsried, Germany.

Understanding the immunobiology of muscle is relevant to muscular autoimmune diseases and to gene therapies based on myoblast transfer. We have investigated the constitutive and cytokine-induced intra- and extracellular expression of histocompatibility human leukocyte antigens (HLA) and cell adhesion molecules by multinucleated human myotubes using immunofluorescence microscopy. Myotubes constitutively expressed HLA class I but not HLA class II. Exposure to interferon-gamma, but not tumor necrosis factor-alpha, induced HLA-DR in the cytoplasm and on the surface membrane of approximately 40 to 95% of cultured myotubes. Surface expression was strongest in perinuclear membrane areas, and cytoplasmic expression was strongest at branching points and at the tips of myotubes. HLA-DP and HLA-DQ were not expressed in detectable amounts. Both interferon-gamma and tumor necrosis factor-alpha induced the intercellular adhesion molecule-1 (CD54) in the cytoplasm and on the surface of nearly all myotubes. The distribution of intercellular adhesion molecule-1 and HLA-DR was similar but not identical in double- positive myotubes. The leukocyte function-associated (LFA) adhesion molecules LFA-1 (CD11a/CD18), LFA-2 (CD2), and LFA-3 (CD58) could not be detected in the cytoplasm or on the surface. Our results indicate that cytokine-induced myotubes can participate in immune interactions with T lymphocytes.

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