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M94A0140.TXT
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1994-10-01
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Document 0140
DOCN M94A0140
TI Transactivation of the human interleukin-6 gene by human T-lymphotropic
virus type 1 Tax protein.
DT 9412
AU Yamashita I; Katamine S; Moriuchi R; Nakamura Y; Miyamoto T; Eguchi K;
Nagataki S; First Department of Internal Medicine, Nagasaki University
School; of Medicine, Japan.
SO Blood. 1994 Sep 1;84(5):1573-8. Unique Identifier : AIDSLINE
MED/94348082
AB Interleukin-6 (IL-6) is a multifunctional cytokine that regulates both
humoral and cellular immune responses. Accumulating evidence suggests
that the infection of T cells and other cell types with human
T-lymphotropic virus type 1 (HTLV-1) results in the constitutive
expression of IL-6. However, the underlying molecular mechanisms are
little understood. When a reporter plasmid, pIL6-CAT-E3, in which the
human IL-6 enhancer/promoter region from -630 to +14 was linked to the
bacterial chloramphenicol acetyltransferase (CAT) gene, was transfected,
HTLV-1-infected but not -uninfected T-cell lines activated the IL-6
promoter. This indicated the presence of a factor transactivating the
IL-6 gene in the infected cells. To evaluate the involvement of the
HTLV-1-encoded transacting factor (Tax) in this transactivation, we
examined the effect of transient cotransfection with the Tax-expression
plasmid, pMAX-Neo, on the transcription from the IL-6 promoter by use of
COS1 cells. The cotransfected COS1 has about six-times greater the CAT
activity than that transfected with pIL6-CAT-E3 alone. The analysis of a
series of deletions of the IL-6 promoter suggested that the region
(-105/-47) containing a NF kappa B site was crucial for the Tax
responsiveness. We further examined the effect of Tax on endogenous IL-6
gene expression using the Jurkat clone, JPX-9, stably transfected with
pMAX-Neo. JPX-9 accumulated steady state transcripts of the endogenous
IL-6 gene in response to the induction of Tax expression. Our findings
indicate an important role of the Tax protein in the expression of IL-6
in cells infected with HTLV-1.
DE Animal Base Sequence Cell Line Cercopithecus aethiops
Chloramphenicol Acetyltransferase/BIOSYNTHESIS/GENETICS DNA Primers
Enhancer Elements (Genetics) *Gene Expression Gene Products,
tax/BIOSYNTHESIS/*METABOLISM Human HTLV-I/GENETICS/*PHYSIOLOGY
Interleukin-6/*BIOSYNTHESIS/*GENETICS Kidney Molecular Sequence Data
Polymerase Chain Reaction Promoter Regions (Genetics) Restriction
Mapping RNA, Messenger/ANALYSIS/BIOSYNTHESIS Support, Non-U.S. Gov't
*Trans-Activation (Genetics) Transfection Tumor Cells, Cultured
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).