Abstract
a1-1 cells, a transformant line obtained by transfection of NIH 3T3 cells with human c-Ha-rasT24 (hc-Ha-rasT24), were converted to morphologically normal flat cells following a 2-week culture in the presence of benzamide (BA), an inhibitor of poly(ADP-ribose) polymerase [ADP-ribosyltransferase (polymerizing); EC 2.4.2.30]. Concomitant with these morphological changes was the loss of the exogenous hc-Ha-rasT24 sequence. When cells were cultured without transfer, multiple clusters of flat revertant cells surrounded by transformed cells within single colonies of a1-1 cells were observed. This, together with the slow growth rate of flat cells in the presence of BA, indicated that flat revertants were induced rather than selected by BA. Flat cells isolated from mixed colonies completely lost the exogenous and amplified hc-Ha-rasT24 gene. In contrast, the endogenous mouse c-Ha-ras in flat revertant cells was not lost during culture with BA. Similarly, the endogenous hc-Ha-rasT24 in human bladder carcinoma T24 cells was not affected by BA. By using various chemicals, it was suggested that inhibition of poly(ADP-ribose) polymerase induces an efficient and specific loss of the exogenous transforming genes including Ki-ras, N-ras, c-raf, and ret-II.
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