Unimpaired histone synthesis in human fibroblasts infected by human cytomegalovirus.

Abstract:

:Serum-starved human foreskin fibroblasts were infected by human cytomegalovirus (Towne strain) that is thought to induce DNA replication in host cells during lytic infection. At various times postinfection, the cultures were pulse labeled with either 3H-thymidine or 14C-thymidine and 3H-lysine to examine DNA synthesis and histone synthesis, respectively. Isopycnic centrifugation of labeled DNA in CsCl revealed that precursor incorporation into host-cell DNA was enhanced over the control around 24 h postinfection and decreased after onset of viral DNA synthesis which reached a peak around 72 h postinfection. For analysis of histones 3H-lysine-labeled proteins of lysates of unfractionated cells and of chromatin preparations were subjected to polyacrylamide gel electrophoresis in presence of sodium dodecyl sulfate and subsequent fluorography. Comparison of the fluorograms from the various pulses postinfection suggested that 3H-lysine incorporation into histones exhibited no major variations concurrent with the changes of host-cell DNA synthesis. In contrast, herpes simplex virus type 1 was found progressively to extinguish histone synthesis in the course of the cellular infection. Furthermore, histone synthesis in phosphonoacetic acid-treated cytomegalovirus-infected cultures was not enhanced over that in mock-infected controls. These observations do not support the view that human cytomegalovirus induces host-cell DNA replication under the conditions used.

journal_name

Med Microbiol Immunol

authors

Radsak K,Schmitz B

doi

10.1007/BF02121653

subject

Has Abstract

pub_date

1980-02-01 00:00:00

pages

63-72

issue

1

eissn

0300-8584

issn

1432-1831

journal_volume

168

pub_type

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