Abstract
We examined class I and class II HLA antigen expression by flow cytometry in clonal cultures derived from normal human skeletal muscle biopsies. Both HLA class I and class II antigens were constitutively expressed in all clones studied. By altering the constituents of the culture medium, we could modulate the expression of HLA class II but not HLA class I antigens. We noted heterogeneity in the expression of HLA class II antigens among different clones; an increased expression was associated with an increased propensity of myoblasts to fuse. These findings indicate that normal aneurally cultured myoblasts may express both HLA class I and class II antigens, that this expression may be modulated by in vitro agents, and that the presence of these antigens may relate to the process of in vitro myoblast fusion.
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