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M9470108.TXT
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1994-07-02
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Document 0108
DOCN M9470108
TI Tax proteins of human T-cell leukemia virus type 1 and 2 induce
expression of the gene encoding erythroid-potentiating activity (tissue
inhibitor of metalloproteinases-1, TIMP-1).
DT 9409
AU Uchijima M; Sato H; Fujii M; Seiki M; Department of Molecular Virology
and Oncology, Kanazawa; University, Ishikawa, Japan.
SO J Biol Chem. 1994 May 27;269(21):14946-50. Unique Identifier : AIDSLINE
GENBANK/D26513
AB A growth factor-like activity for erythroid cells
(erythroid-potentiating activity) is produced by the T-cells infected
with human T-cell leukemia virus type 2 (HTLV-2) (Gasson, J. C., Golde,
D. W., Kaufman, S. E., Westbrook, C. A., Hewick, R. M., Kaufmann, R. J.,
Wong, G. G., Temple, P. A., Leary, A. C., Brown, E. L., Orr, E. C., and
Clark, S. C. (1985) Nature 315, 768-771) and is reportedly identical
with tissue inhibitors of matrix metalloproteinases-1 (TIMP-1)
(Docherty, A. J. P., Lyons, A., Smith, B. J., Wright, E. M., Stephens,
P. E., Harris, T. J. R., Murphy, G., and Reynolds, J. J. (1985) Nature
318, 66-69). We found that adult T-cell leukemia cell lines infected
with HTLV-1 also express high levels of a TIMP-1 transcript. A viral
transactivator of HTLV-1, Tax1, in a human T-cell line (Jurkat), was
sufficient to stimulate transcription of the TIMP-1 gene. Deletion and
mutation analysis of the TIMP-1 gene promoter showed that the AP-1
binding site in the 38-base pair sequence conserved between the human
and mouse genes was essential for activation by Tax1. The transactivator
of HTLV-2 also stimulated the promoter through the same cis-element. The
reported growth-promoting activity of TIMP-1 against erythroid cells and
potentially against HTLV-1-infected T-cells may modulate the clinical
course of adult T-cell leukemia.
DE Animal Base Sequence Binding Sites Cells, Cultured *Gene Expression
Regulation, Viral Gene Products, tax/*PHYSIOLOGY
Glycoproteins/*GENETICS Human HTLV-I/*METABOLISM HTLV-II/*METABOLISM
Lymphocytes/MICROBIOLOGY Mice Molecular Sequence Data Nuclear
Proteins/METABOLISM Proto-Oncogene Proteins/METABOLISM Proto-Oncogene
Proteins c-jun/METABOLISM RNA, Messenger/METABOLISM Support, Non-U.S.
Gov't Trans-Activation (Genetics) JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).