Characteristics of nitric oxide-induced apoptosis and its target cells in mitogen-stimulated peripheral blood mononuclear cells from HIV+ subjects.

Abstract:

:The phenomenon of apoptosis observed in lymphoid cells from HIV+ subjects is an important factor contributing to their massive depletion. Several studies have identified nitric oxide (NO) as one of the molecules involved in the apoptosis phenomenon observed during HIV infection. It has been shown that HIV-derived gp120 enhances NO synthesis in cultured cells from HIV+ individuals. Therefore, we tested the potential of two nitric oxide synthase (NOS) inhibitors with different mechanisms of action as preventive agents of in vitro apoptosis, in peripheral blood mononuclear cells (PBMC) from HIV+ subjects. PBMC isolated from these patients always showed higher apoptosis levels than normal subjects, a fact that correlated with overproduction of NO and with reduction of mitochondrial transmembrane potential in these cells. We identified the CD8+ T lymphocyte sub-population as the major apoptosis target in PBMC cultures. Treatment with NO inhibitors N(G)-monomethyl-L-arginine (L-NMMA) and dexamethasone (DEX) inhibited spontaneous and mitogen-induced apoptosis, while reducing mitochondrial alterations in PBMC from both normal (30%) and HIV+ (70%) subjects. The development of apoptosis in target cells correlated with their mitochondrial transmembrane potential impairment and with increased expression of Fas (CD95) molecules. These results offer additional alternatives for the manipulation of cellular depletion in HIV disease.

journal_name

Immunol Invest

authors

García M,del Llano AM,Cruz-Colón E,Saavedra S,Lavergne JA

doi

10.1081/imm-100108163

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

267-87

issue

4

eissn

0882-0139

issn

1532-4311

journal_volume

30

pub_type

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