title: Differential patterns of human cytomegalovirus gene expression in various T-cell lines carrying human T-cell leukemia-lymphoma virus type I: role of Tax-activated cellular transcription factors.
abstract: Replication of human cytomegalovirus (HCMV) was investigated in various T-cell lines expressing the tax gene product of human T-cell leukemia-lymphoma virus type I (HTLV-I). Differential patterns of HCMV replication were found in HTLV-I-carrying cell lines. HCMV gene expression was restricted to the immediate-early genes in MT-2 and MT-4 cells, whereas full replication cycle of the virus was observed in C8166-45 cells. Productive HCMV infection induced a cytopathic effect resulting in the lysis of infected cells. The results of electrophoretic mobility shift assay (EMSA) showed high levels of NF-kappaB-, CREB/ATF-1-, and SRF-specific DNA binding activity in all Tax-positive cell lines. In contrast, SP1 activity could be detected only in C8166-45 cells. Using an inducible system (Jurkat cell line JPX-9), a dramatic increase in NF-kappaB, CREB/ATF-1, SRF, and SP1 binding activity, as well as productive HCMV infection, were observed upon Tax expression. Overexpression of SP1 in MT-2 and MT-4 cells converted HCMV infection from an abortive to a productive one. These data suggest that the stimulatory effect of Tax protein on HCMV in T cells is accomplished through at least five host-related transcription factor pathways. The results of this study provide possible mechanisms whereby HCMV infections might imply suppression of adult T-cell leukemia.
authors.affiliation: Institute of Medical Microbiology, Medical and Health Science Center, University of Debrecen, Debrecen, Hungary.
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Beck
authors.forename: Attila
authors.initials: A
authors.lastname: Bácsi
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Liu
authors.forename: Peter
authors.initials: P
authors.lastname: Ebbesen
authors.forename: István
authors.initials: I
authors.lastname: Andirkó
authors.forename: Eszter
authors.initials: E
authors.lastname: Csoma
authors.forename: József
authors.initials: J
authors.lastname: Kónya
authors.forename: Etelka
authors.initials: E
authors.lastname: Nagy
authors.forename: Ferenc D
authors.initials: FD
authors.lastname: Tóth
mesh_terms: D019256:Cadmium Chloride / Q000494:pharmacology; D002460:Cell Line; D002470:Cell Survival; D017362:Cyclic AMP Response Element-Binding Protein / Q000378:metabolism; D003587:Cytomegalovirus / Q000235:genetics*; D015967:Gene Expression Regulation, Viral; D016356:Gene Products, tax / Q000378:metabolism*; D015368:Human T-lymphotropic virus 1 / Q000502:physiology*; D006801:Humans; D007700:Kinetics; D016328:NF-kappa B / Q000378:metabolism; D026362:Serum Response Factor / Q000378:metabolism; D016329:Sp1 Transcription Factor / Q000378:metabolism; D013601:T-Lymphocytes / Q000821:virology*; D014157:Transcription Factors / Q000378:metabolism*; D014779:Virus Replication
chemical_list: D017362:Cyclic AMP Response Element-Binding Protein; D016356:Gene Products, tax; D016328:NF-kappa B; D026362:Serum Response Factor; D016329:Sp1 Transcription Factor; D014157:Transcription Factors; D019256:Cadmium Chloride