The purpose of the experiments was to establish whether individual cells of a tumor cell population, or clonal lines derived from its express the differentiated phenotype, or respond heterogeneously following treatment with inducers of differentiation or with cytostatic drugs. The human cell lines used in this study were: HL-60 promyelocytic leukemia, K562 erythroleukemia, BHM-97 and A2058 melanoma, and A-1, A-2, A-4 and A-6 clones of A2058 line. Inducers of differentiation were phorbol myristate acetate (PMA), dimethylsulfoxide (DMSO) and retinoic acid (RA); cytostatics: adriamycin (ADM), 5-fluorouracil (5-FU), dacarbazine (DTIC), cis-platin (platidiam, PD) and arabinosyl cytosine (ara-C). Expression of the differentiated phenotype was shown by cell attachment (HL-60), hemoglobin production (K562), dendrit formation (A2058, BHM-97). Individual cells expressed the differentiated phenotype heterogeneously in all types of cell populations. Clone A-4 was the most, and clone A-6 the least sensitive to PMA. The drug sensitivity of the clones was different and drug-dependent. It is concluded that induction of differentiation as another approach to therapy of cancer, similar to anticancer drug therapy, also implies disadvantages due to population heterogeneity. Combinations of cytostatics with differentiation inducers might result in improved therapeutic effects.
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