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M94A3204.TXT
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1994-10-25
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Document 3204
DOCN M94A3204
TI Apoptosis induced in CD4+ cells expressing gp160 of HIV type 1.
DT 9412
AU Koga Y; Sasaki M; Department of Infectious Disease, Tohkai University
School of; Medicine, Kanagawa, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):13 (abstract no. 024A). Unique
Identifier : AIDSLINE ICA10/94369371
AB CD4+ cell clones expressing gp160 or gp120 of HIV under the
transcriptional control of an inducible promoter were made in order to
examine the effect of these env products on the downregulation of
surface CD4 and cell injury. A complete disappearance of surface CD4
preceding single-cell death occurred in the cell clones expressing
gp160, in which a complex between gp160 and CD4 was formed and
accumulated intracellularly. In contrast with them, the cell clones
expressing gp120 exhibited no such depletion of surface CD4 nor apparent
cytopathic effect. Further investigation of the events that lead to cell
death in such cells expressing gp160 demonstrated the induction of
apoptosis in them. Prominent elevation of intracellular Ca2+ was
observed at 10-15 min after the expression of gp160 in those cells, and
the treatment of such cells with Ca2+ antagonists blocked significantly
the induction of apoptosis, suggesting that Ca2+ is a critical signal
transducing molecule leading to the apoptosis induced by gp160-CD4
complex.
DE Antigens, CD4/DRUG EFFECTS Antigens, Surface/DRUG EFFECTS
Apoptosis/*DRUG EFFECTS Calcium/METABOLISM Cell Death/DRUG EFFECTS
Gene Products, env/*PHARMACOLOGY Human HIV Envelope Protein
gp120/PHARMACOLOGY HIV-1/*PHYSIOLOGY Protein Precursors/*PHARMACOLOGY
T4 Lymphocytes/MICROBIOLOGY/*PHYSIOLOGY MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).