May 1, 1982

Changes in phenotypic expression in embryonic and adult cells treated with 5-azacytidine

Journal of Cellular Physiology
S M Taylor, P A Jones


We have previously shown that 5-azacytidine (5-Aza-CR) induced the formation of biochemically differentiated myotubes, adipocytes, and chondrocytes in the mouse embryo cell line, C3H/10T1/2CL8 (10T1/2), and that the induction of the muscle phenotype was cell cycle specific. Here we show that the adipocyte phenotype is also induced maximally in cells treated during S phase. During this period, the minimum treatment time required for the subsequent formation of myotubes was 5 min and the number of myotubes formed was dependent on treatment time. The incorporation of 14C-5-Aza-CR into DNA during the cell cycle, however, was not enhanced during early S phase, suggesting that incorporation of 5-Aza-CR into specific DNA sequences synthesized during early S phase may be required for the expression of the new phenotypes. Single cells, obtained by plating cell suspensions into 16 mm wells at limiting dilution, were treated with 5-Aza-CR during S phase. The resulting clones showed a high frequency of phenotypic conversion, indicating that 5-Aza-CR did not act via a selective mechanism, and several of the clones were capable of expressing more than one phenotype. The cells required more than 2 division cycles after treatment with the anal...Continue Reading

Mentioned in this Paper

Fat Pad
Cell Division
Cell Differentiation Process
Cell Division Phases
Cell Cycle

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