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M9620598.TXT
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1996-02-26
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Document 0598
DOCN M9620598
TI Acute Plasmodium falciparum infection is associated with increased
percentages of apoptotic cells.
DT 9602
AU Balde AT; Sarthou JL; Roussilhon C; Unite d'Immunologie, Institut
Pasteur, Dakar, Senegal, West; Africa.
SO Immunol Lett. 1995 May;46(1-2):59-62. Unique Identifier : AIDSLINE
MED/96078154
AB The impact of acute malaria infection on the level of spontaneous
apoptosis, i.e., the percentage of apoptotic cells detectable in
lymphocytes cultured without any exogenous stimulus for 3 days in vitro,
was evaluated. Quantitation of apoptosis was performed by staining of
lymphocyte nuclei with propidium iodide and analysis of the fluorescence
by cytometry. The mean apoptosis of 23 HIV-negative patients (15
Africans and 8 Europeans) determined during a confirmed Plasmodium
falciparum attack was 27.2% (95% confidence interval (CI) = 23.5-30.7%)
i.e., 2.2 times the mean level found in 49 controls (12.4%, CI =
11.1-13.6). These controls included age- and sex-matched Africans (n =
37) and Europeans (n = 12) differing only by their previous level of
exposure to P. falciparum. Naive (European) as well as previously
exposed (African) subjects showed dramatically elevated levels of
spontaneous apoptosis during the malaria attack (mean = 22.5%, CI =
20.7-24.4 for Europeans; mean = 29.7%, CI = 24.6-34.7 for Africans).
Such unusually raised levels were observed for at least 1.5 months and
were probably detectable for longer periods as suggested by the fact
that the mean level of spontaneous apoptosis in healthy Africans was
basically higher (13.8%, CI = 12.5-15) than the one found in healthy
Europeans (8.2%, CI = 6.3-10.1) (P = 0.0001). Selective immunomagnetic
cell isolations carried out immediately before apoptosis quantitation
showed that this process affected not only the alpha beta T cells (CD4+
T cells as well as CD8+ T cells) but also the gamma delta T cells and
the B-lymphocyte subset.(ABSTRACT TRUNCATED AT 250 WORDS)
DE Acute Disease Apoptosis/*IMMUNOLOGY Human Leukocytes,
Mononuclear/PHYSIOLOGY Lymphocyte Count Malaria,
Falciparum/*IMMUNOLOGY JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).