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. 1990 May;64(5):2033–2040. doi: 10.1128/jvi.64.5.2033-2040.1990

Induction of cellular hsp70 expression by human cytomegalovirus.

L D Santomenna 1, A M Colberg-Poley 1
PMCID: PMC249358  PMID: 2157870

Abstract

Expression of the cellular heat shock protein 70 gene (hsp70) is transiently induced by human cytomegalovirus (HCMV) infection of permissive human diploid fibroblasts. Induction of the cellular heat shock response during critical times of infection had previously been reported to alter the growth of HCMV in vitro. Thus, a potential interaction between heat shock proteins and HCMV expression was indicated. HCMV dramatically increased expression of hsp70 RNA within 8 h of infection. hsp70 RNA remained elevated at 24 and 48 h postinfection and decreased to low levels of 72 h postinfection. Induction of HSP70 protein occurred more slowly; inducible HSP70 protein encoded by this RNA increased within 16 h postinfection and continued to increase throughout infection until 72 h postinfection, when the highest abundance of inducible HSP70 protein was observed. Cells that received both heat (43 degrees C for 70 min) treatment and HCMV infection expressed hsp70 RNA to levels above the sum of levels present in cells given either treatment alone. Furthermore, hsp70 RNA induction occurred earlier and remained elevated longer than in cells infected with HCMV alone or in cells treated with heat alone, respectively. Nevertheless, the pattern of HCMV immediate-early transcript expression at 2, 4, and 6 h postinfection appeared to be unchanged by this prior heat treatment. Our results suggest that heat shock treatment and HCMV infection can act additively in stimulating hsp70 RNA expression. The previously reported stimulation of HCMV growth in vitro following the heat shock response apparently does not result from alterations in the steady-state expression of HCMV immediate-early transcripts.

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