Summary
Three distinct subpopulations (A, B, C) derived from a dimethylbenzanthracene-induced rat rhabdomyosarcoma were established as permanent cell lines. Although the clonal nature of each of these subpopulations was confirmed by repeated recloning procedures, a striking intraclonal phenotypic heterogeneity was observed. By means of immunofluorescence microscopy and transmission electron microscopy, it could be shown that these subpopulations closely recapitulate stages of embryonic rhabdomyogenesis both in vitro and in vivo, but differ in their particular range of maximum differentiation. Embryonic rhabdomyogenesis is imitated most perfectly by subpopulation C, in which multinuclear myotubes are formed in vitro by fusion of mononuclear cells, and α-sarcomeric actin is expressed in the multinuclear cells and in a few mononuclear cells. After retransplantation in vivo, subpopulation C further proceeds in fine structural differentiation, now exhibiting myofibrils with a sarcomeric organization in the myotube-like giant cells. The cells of subpopulation B do not exceed the stage of mononuclear desmin-positive cells in vitro, but synthesize thin and thick myofilaments after retransplantation in vivo. The cells of subpopulation A recapitulate embryonic rhabdomyogenesis least successfully being confined to the stage of mononuclear desmin-positive cells. Thus, the coexistence of diverse subpopulations and the cellular maturation within these subpopulations together contribute to the phenotypic heterogeneity of rhabdomyosarcomas.
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This work was supported by the Deutsche Forschungsgemeinschaft (GA 326/1-6) and the Swiss National Science Foundation
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Gerharz, C.D., Gabbert, H., Moll, R. et al. The intraclonal and interclonal phenotypic heterogeneity in a rhabdomyosarcoma cell line with abortive imitation of embryonic myogenesis. Virchows Archiv B Cell Pathol 55, 193–206 (1988). https://doi.org/10.1007/BF02896576
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DOI: https://doi.org/10.1007/BF02896576