Abortive transformation of temperature-sensitive mutants of rat 3Y1 cells by simian virus 40: effect of cellular arrest states on entry into S phase and cellular proliferation.

Abstract:

:Four temperature-sensitive (ts) mutants of rat 3Y1 fibroblasts, representing independent complementation groups, cease to proliferate predominantly with a 2n DNA content, at the restrictive temperature (39.8 degrees C) (temperature arrest) or at the permissive temperature (33.8 degrees C) at a confluent cell density (density arrest) (Ohno et al., 1984). We studied the temperature- or the density-arrested cells of these mutants infected with simian virus 40 (SV40) or its mutants affecting large T or small t antigen with respect to kinetics at 39.8 degrees C of entry into S phase and cellular proliferation. Three mutants, 3Y1tsD123, 3Y1tsF121 and 3Y1tsG125, expressed T antigen and entered S phase at 39.8 degrees C from both the arrested states after infection with either wild-type, tsA mutants, or a .54/.59 deletion mutant of SV40, whereas in the density-arrested 3Y1tsH203, expression of T antigen and entry into S phase were inefficient and ts. Following the WT-SV40 induced entry into S phase, the temperature-arrested 3Y1tsD123 detached from the substratum with no detectable increase in cell number, whereas the density-arrested ones completed a round of the cell cycle and then detached. 3Y1tsF121 and 3Y1tsG125 in the both arrested states proliferated through more than one generation. 3Y1tsF121 and 3Y1tsG125 in the density-arrested state infected with tsA mutants once proliferated and then ceased to increase in number as the percentage of T-antigen positive population decreased. These results suggest that wild-type and tsA-mutated large T antigens are able to overcome the cellular ts blocks of entry into S phase in the 3 ts mutants of 3Y1 cells in both the arrested states, and that small t antigen is not required to overcome the blocks. It is also suggested that cellular behaviors subsequent to S phase (viability, mitosis, and proliferation in the following generations) depend on cellular arrest states, on traits of cellular ts defects, and on the duration of large T antigen expression.

journal_name

J Cell Physiol

authors

Mitsudomi T,Kimura G

doi

10.1002/jcp.1041230310

subject

Has Abstract

pub_date

1985-06-01 00:00:00

pages

353-60

issue

3

eissn

0021-9541

issn

1097-4652

journal_volume

123

pub_type

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