Correlation between the presence of T-antigen and the reinitiation of host DNA synthesis in senescent human diploid fibroblasts after SV40 infection.

Abstract:

:Senescent human diploid fibroblasts, TIG-1, had labelling indices of about 0.5-3% when labelled with [3H]thymidine for 3 days in fresh medium containing 10% fetal bovine serum. When these cells were infected with SV40, the percentage of nuclei incorporating [3H]thymidine increased by about 10-fold. The frequency of T-antigen-positive cells and that of [3H]thymidine-incorporating cells were almost the same. About 80% of T-antigen-positive cells were also positive to incorporation of [3H]thymidine, and the same result was obtained in infected young cells. These results indicated that senescent human diploid cells which are brought to synthesize T-antigen always initiate DNA synthesis as young cells do. The characteristics of senescent cells as compared with younger cells was low incidence of T-antigen-positive cells after infection. The basis of low susceptibility of senescent cells to initiate DNA synthesis by SV40 infection thus seems to be concerned with an event after the adsorption of virus, but before the synthesis of a detectable amount of T-antigen.

journal_name

Exp Cell Res

authors

Tsuji Y,Ide T,Ishibashi S

doi

10.1016/0014-4827(83)90450-0

subject

Has Abstract

pub_date

1983-03-01 00:00:00

pages

165-9

issue

1

eissn

0014-4827

issn

1090-2422

pii

0014-4827(83)90450-0

journal_volume

144

pub_type

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