Potentialization of IL-2 effects on immune cells by oyster extract (JCOE) in normal and HIV-infected individuals.

Peripheral blood mononuclear cells (PBMCs) are physiologically activated by interleukin (IL)-2. We found that oyster extract (JCOE) currently used as a functional nutrient enhanced in vitro the IL-2 dependent activation as measured by cell count. 3H-thymidine uptake and up-regulation of a IL-2 receptor.

Homeostasis of chemokines, interferon production and lymphocyte subsets: implications for AIDS pathogenesis.

Certain individuals with elevated levels of macrophage inflammatory protein (MIP)1 alpha, MIP1 beta and RANTES expression appear to be resistant to human immunodeficiency virus (HIV) infection. In this work, we demonstrate that chemokines production by peripheral blood mononuclear cells (PBMCs) are homeostatic parameters varying from one individual to another, and we define optimized experimental conditions to reproducibly assess these parameters. We also studied alpha- and gamma-interferons (IFN alpha and IFN gamma, respectively) which have been implicated in the pathogenesis of acquired immunodeficiency syndrome (AIDS).

Repair of the in vitro HIV-1-induced immunosuppression and blockade of the generation of functional suppressive CD8 cells by anti-alpha interferon and anti-Tat antibodies.

The acute human immunodeficiency virus type 1 (HIV-1) infection of activated peripheral blood mononuclear cells (PBMCs) from normal donors results in inhibition of cell proliferation and generation of functional suppressive T cells. Cultured HIV-1 infected PBMCs but not uninfected PBMCs, following irradiation, can inhibit the proliferation of antigen-activated autologous T cells in a dose-dependent way. CD8+ cell subpopulation is responsible for this inhibition.

Biological effect of active anti-IFN alpha immunization in HIV-infected patients.

Circulating interferon (IFN) was investigated in HIV-1 seropositive patients by measuring the IFN alpha antiviral effect in the serum. While serum of healthy seronegative individuals exhibits an antiviral effect, not due to IFNs, considered as background, serum of seropositive patients showed an additional antiviral effect due to the abnormal presence of IFN alpha. Increased titers of IFN alpha were found in the course of the HIV infection and seemed to correlate with the evolution of AIDS disease.

Identification of CD4 and major histocompatibility complex functional peptide sites and their homology with oligopeptides from human immunodeficiency virus type 1 glycoprotein gp120: role in AIDS pathogenesis.

CD4 molecules interact with class II major histocompatibility complex molecules as a critical costimulatory signal in CD4+ cell immune activation. CD4 also recognizes a specific region of the human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein gp120 forming a binding site for early stages of HIV-1 infection. We designed two software packages, AUTOMAT and CRITIC, which allowed us to identify similarities between regions of HIV-1 proteins and immunoregulatory protein sequences stored in data banks.

HIV-1-induced immune suppression may result from autoimmune disorders including anti-SLWDQ autoantibodies.

We have previously unravelled the striking SLWDQ pentapeptide identity between HIV-1 env gp120 and the CD4 molecule. We show here that this pentapeptide is required for the functioning of the co-stimulatory MHC-CD4 signal in T4-cell activation since it suppresses antigen-induced T-cell proliferation. Moreover, concerning the MHC class II counterpart, the LNGQEETGVVSTN sequence which strongly inhibits T-cell immune activation is likely to be part of the functional site of the molecule.

Striking similarities between HIV-1 Env protein and the apoptosis mediating cell surface antigen Fas. Role in the pathogenesis of AIDS.

We have designed a computer strategy in order to detect systematically peptidic sites with the potential of interfering with the immune regulatory processes. Applying this software to HIV-1 proteins has led us to unravel a few peptidic sites which could either act directly or be the targets of an auto-immune reaction during HIV-1 infection. We previously reported that the SLWDQ pentapeptide identity with a critical site of CD4 could trigger in HIV-1 infected individuals both an humoral and a cellular autoimmune reaction.