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M9650484.TXT
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1996-03-09
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Document 0484
DOCN M9650484
TI Changes in membrane enzymes and glycosphingolipids in lymphocytes from
HIV-1--infected and noninfected intravenous drug users.
DT 9605
AU Leoni LM; Losa GA; Laboratory of Cellular Pathology, Institute of
Pathology,; Locarno, Switzerland.
SO J Acquir Immune Defic Syndr Hum Retrovirol. 1996 Feb 1;11(2):188-97.
Unique Identifier : AIDSLINE MED/96147320
AB The amounts of cell-surface glycosphingolipids and plasma membrane
enzymes produced on the peripheral blood mononuclear cells (PBMNCs)
isolated from 101 intravenous drug users (IDUs), of whom 91 were HIV-1
seropositive, were examined. Seronegative IDUs and age-matched healthy
donors served as controls. The numbers of circulating CD3+, CD4+, and
CD8+ T lymphocytes decreased during the advanced stages of the
infection. There were also fewer CD4+ T-helper cells in
HIV-1--seronegative IDU drug addicts. PBMNCs from HIV-1--seropositive
subjects had abnormal surface enzyme kinetics. The phospholipase C had
two pH optima, whereas the enzyme on normal cells has only one. The
specific activity in cells from AIDS subjects was 4 times lower than
that in normal PBMNCs. 5'-Nucleotidase showed a similar trend, whereas
neutral endopeptidase activity did not correlate with the amounts of
surface common acute lymphoblastic leukemia antigen (CALLA). These
enzyme activities were decreased in HIV-seronegative IDUs. The
subcellular distribution of enzymes and the profile of surface
glycosphingolipids were also markedly changed, indicating the profound
alterations in the membranes of PBMNCs from HIV-1--seropositive IDUs.
These data suggest that intravenous drug use compromises the biochemical
and structural integrity of the membrane surface of PBMNCs even before
the onset of HIV.
DE Adolescence Adult Cell Membrane/ENZYMOLOGY CD4 Lymphocyte Count
CD4-Positive T-Lymphocytes/IMMUNOLOGY CD8-Positive
T-Lymphocytes/IMMUNOLOGY Enzymes/*METABOLISM Female
Gangliosides/BLOOD Glutathione Transferases/METABOLISM
Glycosphingolipids/*BLOOD Human HIV
Infections/*BLOOD/COMPLICATIONS/ENZYMOLOGY HIV
Seropositivity/BLOOD/ENZYMOLOGY/IMMUNOLOGY *HIV-1 Immunophenotyping
Lymphocytes/ENZYMOLOGY/*METABOLISM Male Membrane
Metallo-Endopeptidase/METABOLISM Middle Age Peptide
Peptidohydrolases/METABOLISM Phospholipase C/METABOLISM Sialic
Acids/BLOOD Substance Abuse,
Intravenous/*BLOOD/COMPLICATIONS/ENZYMOLOGY Support, Non-U.S. Gov't
5'-Nucleotidase/METABOLISM JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).