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1996-02-27
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Document 0596
DOCN M9630596
TI Transmembrane P-glycoprotein (P-gp/P-170) in HIV infection: analysis of
lymphocyte surface expression and drug-unrelated function.
DT 9603
AU Lucia MB; Cauda R; Landay AL; Malorni W; Donelli G; Ortona L; Istituto
Clinica delle Malattie Infettive, Universita Cattolica; del Sacro Cuore,
Rome, Italy.
SO AIDS Res Hum Retroviruses. 1995 Aug;11(8):893-901. Unique Identifier :
AIDSLINE MED/96020090
AB P-glycoprotein (P-gp/P-170), a transmembrane efflux pump known to be one
of the mechanisms responsible for multidrug resistance in cancer
therapy, is constitutively expressed in several solid human tissues as
well as in normal peripheral blood lymphocytes and bone marrow cells. In
particular, this molecule has been associated with the transport of
perforin and other cytolysins in natural killer (NK) and T cytotoxic
lymphocytes. In the present study, we analyzed peripheral blood
lymphocytes (PBLs) from controls and HIV+ patients for phenotypic
expression and function of the P-gp/P-170 molecule. We found that 90% of
all PBL subsets (i.e., CD4+, CD8+, CD56+, and CD19+ cells) expressed
surface P-gp/P-170 both in controls and HIV+ patients. However, a
significant decrease in CD4+/P-170+ and CD19+/P-170+ cells was observed
in HIV+ individuals with respect to controls. PHA and IL-2 stimulation
of PBLs was unable to increase the expression of P-gp/P-170 both in
controls and HIV+ patients, despite the increased detection of the CD25
molecule. On the other hand, stimulation with anti-CD3 determined a
significant increase in lymphocyte P-gp/P-170. The function of
P-gp/P-170, assessed by a flow cytometric assay for rhodamine-123
(Rh123) efflux, was significantly reduced in CD16+ NK cells and CD19+ B
cells from HIV+ patients. The Rh123 efflux by NK cells correlated (p <
0.01) with the NK cytotoxicity against the 51Cr-labeled K562 cell line.
Last, the effect of the antiretroviral drugs AZT, ddI, and ddC on P-gp
expression and function was evaluated. The dideoxynucleoside compounds
did not inhibit P-gp/P-170 function of normal mononuclear cells in
vitro, and did not increase P-gp/P-170 expression in vivo, in patients
undergoing antiretroviral therapy with AZT. These findings provide
further evidence of a possible involvement of the P-gp/P-170 system in
specific immunological lymphocyte functions, and especially in
cytotoxic-type functions. In addition, it is possible to suggest, on the
basis of our experimental data, that the dideoxynucleoside class of
antiretroviral agents does not contribute to the phenotypic and
functional alterations related to P-glycoprotein during HIV infection.
DE Adult Antiviral Agents/*PHARMACOLOGY Cells, Cultured
Didanosine/PHARMACOLOGY Female Human HIV Seropositivity/*METABOLISM
Immunophenotyping Interleukin-2/PHARMACOLOGY Lymphocyte Transformation
Lymphocytes/DRUG EFFECTS/IMMUNOLOGY/*METABOLISM Male
P-Glycoprotein/*METABOLISM Phytohemagglutinins/PHARMACOLOGY Support,
Non-U.S. Gov't Zalcitabine/PHARMACOLOGY Zidovudine/PHARMACOLOGY
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).