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J. Virol., Sep 1997, 6495-6500, Vol 71, No. 9
S Michelson, P Dal Monte, D Zipeto, B Bodaghi, L Laurent, E Oberlin, F Arenzana- Seisdedos, JL Virelizier and MP Landini
Chemokines play a major role in inflammatory responses and affect
hematopoiesis both negatively and positively. We show that fresh isolates
and laboratory strains (Towne and Ad-169) of human cytomegalovirus (HCMV)
induce production of the CC chemokine RANTES in fibroblasts. Induction of
extracellular RANTES production occurred as early as 8 h after infection,
peaked around 24 h after infection, and was almost undetectable by 48 and
72 h. Upregulation occurred in the absence of viral DNA synthesis,
suggesting that it was due to immediate- early-early HCMV gene expression.
CMV infection stimulated RANTES transcription, since reverse
transcription-PCR detected a sharp increase in RANTES RNA which persisted
even when extracellular RANTES was no longer detected. Induction of RANTES
in fibroblasts was not due to prior induction of tumor necrosis factor
alpha or interleukin 1 beta. Down-regulation required an active viral
genome. Decrease of RANTES in culture supernatants may be associated with
the appearance of the HCMV CC chemokine receptor US28, since we show that
this gene is transcribed as early as 8 h after infection. Modulation of CC
chemokine production early during CMV infection might have a regulatory
effect on viral replication, as well as affect immune surveillance.
Copyright © 1997, American Society for Microbiology
Modulation of RANTES production by human cytomegalovirus infection of fibroblasts
Unite d'Immunologie Virale, Institut Pasteur, Paris, France. michelso@pasteur.fr
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