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M9630208.TXT
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1996-02-27
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Document 0208
DOCN M9630208
TI [Activation of cell death in lymphocytes from individuals infected with
HIV]
DT 9603
AU Quiros E; Lopez-Canabare MJ; Quiros A; Piedrola G; Maroto MC;
Departamento de Microbiologia, Facultad de Medicina, Granada.
SO Enferm Infecc Microbiol Clin. 1995 Nov;13(9):522-6. Unique Identifier :
AIDSLINE MED/96122978
AB BACKGROUND: In HIV infection, T cells depletion cannot only be explained
by direct viral infection. Programmed cell death (PCD), also know as
apoptosis or activation-induced cell death, may be responsible for the
deletion of reactive T cells that contributes to HIV induced
immunodeficiency. We studied the response of lymphocytes in vitro to
different polyclonal and oligoclonal (superantigen) activators, and
tested whether the stimulation of T cells from individual with HIV
infection lead to cell death. MATERIAL AND METHODS: Peripheral blood
mononuclear cells, total T lymphocytes, TCD4+ and TCD8+ cells from 10
positive patients, 2 patients with AIDS and 10 negative individual for
the virus were cultured in RPMI medium and subjected to stimulation with
PHA, PWM and SEB (staphylococcus B enterotoxin). Trypan blue was used to
distinguish viable from dead cells. RESULTS: TCD4+ cells from
HIV-infected patients die after SEB or PWM activation (almost 40% from
asymptomatic and 80% from AIDS), and do not die TCD8+ from the same
individuals (around 10-15%), or T cells from seronegative controls.
CONCLUSIONS: Lymphocytes from patients with HIV-infection showed as
abnormal proliferative response to self-MHC class II restricted recall
antigens and PWM whereas the response to PHA was conserved. Probably,
apoptosis is triggered by an aberrant form of T cell activation in the
mature TCD4+ cell population in HIV-infected individuals.
DE Acquired Immunodeficiency Syndrome/IMMUNOLOGY *Apoptosis CD4-Positive
T-Lymphocytes/*PHYSIOLOGY CD8-Positive T-Lymphocytes/PHYSIOLOGY
English Abstract Human HIV Infections/*IMMUNOLOGY Immunity, Cellular
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).