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M9650198.TXT
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1996-03-09
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Document 0198
DOCN M9650198
TI Mitochondrial perturbations define lymphocytes undergoing apoptotic
depletion in vivo.
DT 9605
AU Castedo M; Macho A; Zamzami N; Hirsch T; Marchetti P; Uriel J; Kroemer
G; CNRS-UPR420, Villejuif, France.
SO Eur J Immunol. 1995 Dec;25(12):3277-84. Unique Identifier : AIDSLINE
MED/96140663
AB We have recently shown that lymphocyte apoptosis induced by
dexamethasone or superantigens is accompanied by reduction of
mitochondrial transmembrane potential (delta psi m) which precedes
nuclear DNA fragmentation. Here, we demonstrate that fluorochromes such
as 3,3' dihexyloxacarbocyanine iodide [DiOC6(3)] which measure delta psi
m, or fluorochromes such as hydroethidine (HE) which measure
mitochondrial superoxide anion production allow the identification of
thymocytes or peripheral T lymphocytes which are eliminated by apoptosis
in vivo. In mice bearing transgenic alpha/beta T cell receptor (TCR)
specific for a class I-restricted male-specific peptide, the
superoxide-mediated oxidation of HE into ethidium (Eth) is enhanced
among thymocytes which are being deleted due to negative selection (CD4+
CD8+ cells expressing the transgenic TCR in male mice) or lack of
positive selection (CD4+ CD8- thymocytes from female mice). delta psi m
reduction and/or enhanced HE oxidation are also found when apoptosis is
induced by a series of pathogenic agents. Thus, lethal irradiation
provokes mitochondrial and nuclear signs of apoptosis, and both these
alterations are absent in mice bearing a p53 null mutation, underlying
the correlation between mitochondrial perturbation and nuclear
apoptosis. Similarly, superantigen-triggered deletion of peripheral T
cells in vivo is accompanied by enhanced HE-->Eth conversion and reduced
DiOC6(3) uptake. More importantly, as compared to normal controls, CD4+
or CD8+ cells from clinically asymptomatic human immunodeficiency
virus-1 (HIV-1) carriers also contain a significantly elevated
percentage of cells endowed with reduced DiOC6(3) uptake. In
superantigen- and HIV-induced apoptosis, the percentage of T lymphocytes
with a subnormal DiOC6(3) uptake is more important than that of cells
marked by enhanced HE-->Eth conversion. In conclusion, mitochondrial
alterations precede and/or accompany nuclear signs of apoptosis induced
by physiological and a variety of different pathogenic agents in vivo.
DE Animal Apoptosis/*IMMUNOLOGY/RADIATION EFFECTS Clonal Deletion Human
HIV Infections/IMMUNOLOGY/METABOLISM *Lymphocyte Depletion Mice Mice,
Inbred C57BL Mitochondria/*IMMUNOLOGY Protein p53/PHYSIOLOGY Reactive
Oxygen Species/ANALYSIS Staining Superantigens/PHARMACOLOGY Support,
Non-U.S. Gov't T-Lymphocytes/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).