Changes in deoxyribonucleic acid synthesis regulation in Chinese hamster cells infected with simian virus 40.

Abstract:

:Infection of primary or secondary cultures of Chinese hamster embryo cells with simian virus 40 at a multiplicity of 20 to 50 induced synthesis of the virus-specific intranuclear T antigen in 80 to 90% of the cells within 48 to 72 hr. In the infected cultures, 30 to 50% more cells were recruited into deoxyribonucleic acid (DNA) synthesis than in the controls, whether or not the cultures were confluent. The newly synthesized DNA was mostly cellular, since little virus was produced (as shown by various techniques: immunofluorescence for viral antigen, virus growth curves, and isolation of viral DNA from infected cultures). Transformed cells could be detected a few weeks after infection and produced tumors when inoculated into irradiated animals. Chromosomal changes were observed soon after infection (24 hr). Initially, there was a marked increase in the proportion of polyploid cells (8 to 14%), most of which were chromosomally normal. In a few weeks, a large majority of the infected population was polyploid (30 to 50%). Thus, the polyploid cells have the ability to proliferate. Evidence is presented to suggest that polyploid cells arise by stimulation of cells in the G(1), G(2), or S phases to undergo two or more successive periods of DNA synthesis without an intervening mitosis. With a subsequent loss or redistribution of chromosomal material, this may lead eventually to a biologically transformed cell; thus, it is suggested that the initial event(s) relevant to transformation occurs at the level of control of cellular DNA synthesis.

journal_name

J Virol

journal_title

Journal of virology

authors

Lehman JM,Defendi V

doi

10.1128/JVI.6.6.738-749.1970

subject

Has Abstract

pub_date

1970-12-01 00:00:00

pages

738-49

issue

6

eissn

0022-538X

issn

1098-5514

journal_volume

6

pub_type

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