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M9650550.TXT
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1996-03-09
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Document 0550
DOCN M9650550
TI HIV type 1 extracellular Tat protein stimulates growth and protects
cells of BK virus/tat transgenic mice from apoptosis.
DT 9605
AU Campioni D; Corallini A; Zauli G; Possati L; Altavilla G;
Barbanti-Brodano G; Institute of Microbiology, School of Medicine,
University of; Ferrara, Italy.
SO AIDS Res Hum Retroviruses. 1995 Sep;11(9):1039-48. Unique Identifier :
AIDSLINE MED/96089211
AB Cells from BKV/tat transgenic mice were characterized for their
tumorigenic phenotype in nude and syngeneic BDF mice. The results
indicate that the BKV/tat recombinant transgene has a weak tumorigenic
potential, mostly predisposing to oncogenesis, and that second events
are required for the development of tumorigenicity. Tat is endogenously
produced and released by tumor cells. It is taken up by recipient cells
directly from the culture medium, without need of cell to cell contact.
Extracellular Tat stimulates proliferation of cells from BKV/tat
transgenic mice and protects them from apoptosis under conditions of
serum starvation. Our results are in agreement with a model in which Tat
induces its effects on target cells in two different ways. Growth
promotion may require interaction of extracellular Tat with surface
receptors eliciting a signal for cell proliferation, whereas
intranuclear localization of Tat is necessary for transactivation of
viral and cellular genes.
DE Animal Apoptosis Cell Division Cell Line Cell Transformation,
Neoplastic Gene Products, tat/GENETICS/*PHYSIOLOGY Genes, tat Growth
Substances/PHYSIOLOGY HIV-1/GENETICS/*PHYSIOLOGY/PATHOGENICITY Mice
Mice, Inbred BALB C Mice, Nude Mice, Transgenic Support, Non-U.S.
Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).