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- W2155994579 abstract "P-glycoprotein (P-gp) is a transmembrane efflux pump that actively extrude a variety of unrelated drugs from cancer cells, leading to the so-called multidrug resistance (MDR) phenomenon. However, P-gp has also been found in normal bone marrow and peripheral blood mononuclear cells (PBMC). Recently, the presence of P-glycoprotein in PBMC from human immunodeficiency virus (HIV)-infected patients has also been investigated and a phenotype-associated P-gp expression has been detected.A total of thirty-eight HIV-1 positive patients with a mean age of 34 years (range, 24-41 years) were studied after an informed consent. Peripheral blood mononuclear cells (PBMC) were isolated by centrifugation on a Ficoll/Hypaque and P-glycoprotein expression was investigated on lymphocyte population by single and double-color immunofluorescence techniques. We investigated: i) both surface and intracellular expression of the P-gp molecule in different PBMC subsets, ii) P-gp expression modifications occurring during HIV infection, and iii) the effect of HIV-gp120 on the expression of P-gp by T lymphocyte subsets from healthy donors.Our experimental findings indicate that: a) P-gp glycoprotein can be detected on an intracellular level in different PBMC subpopulations (mainly CD8+ T lymphocytes, CD16+ NK cells and CD14+ monocytes); b) this intracellular expression is decreased in specific PBMC subsets (i.e. T-CD8+ and NK-CD16+) from HIV-infected patients and c) a rearrangement was obtained when CD4+ and CD8+ lymphocytes from healthy donors were exposed in vitro to the HIV-binding glycoprotein gp120.Our results indicate that P-gp glycoprotein can also be expressed intracellularly and can be rearranged in PBMC subsets from HIV-infected patients." @default.
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- W2155994579 date "1998-01-01" @default.
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- W2155994579 title "Intracellular expression of P-170 glycoprotein in peripheral blood mononuclear cell subsets from healthy donors and HIV-infected patients." @default.
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