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Mechanisms of HIV-associated immunosuppression
D D Peković1, M Gornitsky, S Garzon
1AIDS Research Center, Soficorp Scientific, Montreal, Canada.
Cancer Detection and Prevention
|January 1, 1988
Summary
Human immunodeficiency virus (HIV) primarily infects OKT4+ lymphocytes. Antibody-complement complexes on cells suggest a mechanism for lymphocyte destruction in HIV patients.
Area of Science:
- Immunology
- Virology
- Cell Biology
Background:
- Human immunodeficiency virus (HIV) infection leads to progressive immune system damage.
- Understanding the cellular targets and mechanisms of immune destruction in HIV is crucial.
Purpose of the Study:
- To identify HIV antigens in peripheral blood lymphocytes (PBL).
- To determine the phenotype of HIV-infected lymphocytes.
- To investigate the role of antibody-complement complexes in HIV-associated lympholysis.
Main Methods:
- Immunofluorescence (IF) and Immunoelectron Microscopy (IEM) were used to detect HIV antigens.
- Phenotypic analysis of HIV-containing lymphocytes was performed.
- Detection of antibody-complement (Ab-C3) complexes on PBL surfaces.
Main Results:
- HIV antigens were detected in PBL from HIV-positive patients.
- OKT4+ cells were identified as the principal target cells for HIV.
- Approximately 5% of infected cells were multinucleated.
- Nearly all infected PBL and about 30% of uninfected PBL showed Ab-C3 complexes on their surfaces.
- Sera from HIV-positive patients contained antibodies reactive with PBL.
Conclusions:
- HIV predominantly infects OKT4+ lymphocytes.
- The presence of Ab-C3 complexes on a high percentage of PBL suggests a significant role in antibody-complement-mediated lympholysis.
- This mechanism may contribute substantially to lymphatic tissue destruction in HIV-infected individuals.