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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.

Modulation of RANTES production by human cytomegalovirus infection of fibroblasts