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1996-02-26
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Document 0647
DOCN M9620647
TI Ligation of either CD2 or CD28 rescues CD4+ T cells from
HIV-gp120-induced apoptosis.
DT 9602
AU Tuosto L; Piazza C; Moretti S; Modesti A; Greenlaw R; Lechler R;
Lombardi G; Piccolella E; Department of Cellular and Developmental
Biology, University La; Sapienza, Rome, Italy.
SO Eur J Immunol. 1995 Oct;25(10):2917-22. Unique Identifier : AIDSLINE
MED/96062045
AB Temporal or quantitative imbalance in signals delivered to T cells via T
cell antigen receptor (TCR), the CD4 co-receptor, and accessory
molecules can lead to anergy, apoptosis, or both. This has been observed
following ligation of CD4 by HIV gp120 prior to TCR occupancy. The
ability of molecules such as CD2 and CD28, interacting with their
ligands LFA-3 and B7, to provide signals that protect T cells from the
induction of anergy, has been reported. Here, we demonstrate that
ligation of CD2 and CD28 in conjunction with TCR occupancy rescue T
cells that have been programmed for apoptotic death by prior CD4
ligation to gp120. This appears to be the result of augmented
interleukin-2 and interleukin-4 release by the T cells following these
molecular interactions. In conclusion, our results suggest that an
impairment of antigen-presenting accessory cell functions could favor
gp120-mediated apoptosis in HIV-uninfected cells.
DE Animal *Antigen Presentation Antigens, CD2/*METABOLISM Antigens,
CD28/*METABOLISM Antigens, CD58/IMMUNOLOGY Antigens,
CD80/GENETICS/IMMUNOLOGY Apoptosis/*DRUG EFFECTS
B-Lymphocytes/IMMUNOLOGY CD4-Positive T-Lymphocytes/CYTOLOGY/*DRUG
EFFECTS/METABOLISM Hemagglutinins, Viral/IMMUNOLOGY Human HIV
Envelope Protein gp120/*PHARMACOLOGY HIV-1/*PHYSIOLOGY HLA-DR1
Antigen/GENETICS/IMMUNOLOGY Interleukin-2/PHARMACOLOGY/SECRETION
Interleukin-4/PHARMACOLOGY/SECRETION L Cells Leukocytes,
Mononuclear/IMMUNOLOGY/METABOLISM Ligands *Lymphocyte Transformation
Mice Monocytes/IMMUNOLOGY Peptide Fragments/IMMUNOLOGY Recombinant
Proteins/PHARMACOLOGY 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).