Abstract:
:Adult T-cell leukemia (ATL) is caused by human T-cell leukemia virus type 1 (HTLV-1). Elevated expression of vascular endothelial growth factor (VEGF) in ATL patients is associated with leukemic cell invasion and infiltration in different organs. The regulatory protein Tax 1 encoded by HTLV-1 plays a pivotal role in T-cell transformation by deregulating the function and expression of several cellular factors. In the present study, we examined the effect of Tax 1 on VEGF expression at transcriptional and posttranscriptional levels in order to elucidate the regulatory mechanisms involved. Using functional assays, we demonstrate that Tax 1 downregulates the VEGF promoter through a cluster of Sp1 sites located close to the transcriptional start site. Using gel mobility shift assays, we show that Tax 1 reduced Sp1:DNA complex formation. We demonstrate that the level of secreted VEGF was significantly lower in Tax 1-transfected 293T cells compared to nontransfected cells, which is consistent with the observed downregulatory effect of Tax 1 at the transcription level. We showed that VEGF was secreted by HTLV-1-transformed and nontransformed cells, irrespective of Tax 1 expression. Overall our data indicate that, contrary to a previous report, Tax 1 downregulates VEGF expression and suggest there are Tax 1-independent mechanisms of VEGF activation in ATL.
journal_name
J Viroljournal_title
Journal of virologyauthors
Watters KM,Dean J,Gautier V,Hall WW,Sheehy Ndoi
10.1128/JVI.02166-09subject
Has Abstractpub_date
2010-05-01 00:00:00pages
5222-8issue
10eissn
0022-538Xissn
1098-5514pii
JVI.02166-09journal_volume
84pub_type
杂志文章abstract::The purpose of this study was to determine whether a cell surface protein that can serve as coreceptor for herpes simplex virus type 1 (HSV-1) entry, herpesvirus entry mediator (previously designated HVEM but renamed HveA), also mediates HSV-1-induced cell-cell fusion. We found that transfection of DNA from KOS-804, a...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.72.7.5802-5810.1998
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doi:10.1128/JVI.43.1.104-112.1982
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pub_type: 杂志文章
doi:10.1128/JVI.72.4.3495-3500.1998
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doi:10.1128/JVI.5.1.51-59.1970
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pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.67.9.5522-5528.1993
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pub_type: 杂志文章
doi:10.1128/JVI.69.9.5445-5454.1995
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pub_type: 杂志文章
doi:10.1128/JVI.80.8.3833-3843.2006
更新日期:2006-04-01 00:00:00
abstract::The vaccinia virus A16L open reading frame encodes a 378-amino-acid protein with a predicted C-terminal transmembrane domain and 20 invariant cysteine residues that is conserved in all sequenced members of the poxvirus family. The A16 protein was expressed late in infection and incorporated into intracellular virus pa...
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pub_type: 杂志文章
doi:10.1128/JVI.80.1.51-61.2006
更新日期:2006-01-01 00:00:00
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doi:10.1128/JVI.02504-06
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.73.5.4316-4326.1999
更新日期:1999-05-01 00:00:00
abstract::Varicella-zoster virus (VZV), an alphaherpesvirus restricted to humans, infects differentiated cells in vivo, including T lymphocytes, keratinocytes, and neurons, and spreads rapidly in confluent cultured dermal fibroblasts (HFFs). In VZV-infected HFFs, atypical expression of cyclins D3 and B1 occurs along with the in...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.00153-08
更新日期:2008-12-01 00:00:00
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journal_title:Journal of virology
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pub_type: 杂志文章
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pub_type: 杂志文章
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更新日期:2002-09-01 00:00:00
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/jvi.77.7.4231-4236.2003
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journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.75.20.9585-9595.2001
更新日期:2001-10-01 00:00:00
abstract::The vaccinia virus H2R gene (VACWR 100) is conserved in all sequenced members of the poxvirus family and encodes a protein with a predicted transmembrane domain and four invariant cysteines. A recombinant vaccinia virus, in which expression of the H2 protein is stringently regulated, was unable to replicate without in...
journal_title:Journal of virology
pub_type: 杂志文章
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更新日期:2005-04-01 00:00:00
abstract:UNLABELLED:Many coxsackievirus B (CVB) isolates bind to human decay-accelerating factor (DAF) as well as to the coxsackievirus and adenovirus receptor (CAR). However, the virus does not interact with murine DAF. To understand why CVB3 binds specifically to human DAF, we constructed a series of chimeric molecules in whi...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.02798-14
更新日期:2015-01-15 00:00:00
abstract::Typical herpes simplex virus (HSV) capsids contain seven proteins that form a T=16 icosahedron of 1,250-A diameter. Infection of cells with recombinant baculoviruses expressing two of these proteins, VP5 (which forms the pentons and hexons in typical HSV capsids) and VP19C (a component of the triplexes that connect ad...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.73.8.6821-6830.1999
更新日期:1999-08-01 00:00:00
abstract::The E3 complex transcription unit of adenovirus encodes four major mRNAs (a, c, f, and h) and two minor (d and e) mRNAs with overlapping exons, alternative splice sites, and two polyadenylation sites, termed E3A (upstream) and E3B (downstream). mRNAs a and d use the E3A polyadenylation site, and mRNAs c, e, f, and h u...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.66.10.5914-5923.1992
更新日期:1992-10-01 00:00:00
abstract::Nonenveloped gastrointestinal viruses, such as human rotavirus, can exit infected cells from the apical surface without cell lysis. The mechanism of such nonlytic exit is poorly understood. The nonenveloped Orsay virus is an RNA virus infecting the intestine cells of the nematode Caenorhabditis elegans Dye staining re...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.00745-18
更新日期:2018-06-29 00:00:00
abstract::Packaging of type C retrovirus genomic RNAs into budding virions requires a highly specific interaction between the viral Gag precursor and unique cis-acting packaging signals on the full-length RNA genome, allowing the selection of this RNA species from among a pool of spliced viral RNAs and similar cellular RNAs. Th...
journal_title:Journal of virology
pub_type: 杂志文章
doi:10.1128/JVI.72.7.5886-5896.1998
更新日期:1998-07-01 00:00:00