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NLM AIDSLINE

Impairment of B-lymphocyte differentiation induced by dual triggering of the B-cell antigen receptor and CD40 in advanced HIV-1-disease.




 

AIDS. 1998 Aug 20;12(12):1437-49. Unique Identifier : AIDSLINE

OBJECTIVE: This study was performed to investigate the hyporeactivity of purified B lymphocytes from HIV-1-infected patients. DESIGN: Given the importance of the B-cell Ag receptor (BCR) and CD40 in B-lymphocyte activation, we assessed the capacity of purified peripheral blood B lymphocytes from HIV-1-infected patients to differentiate into Ig-secreting cells in a T-cell- and accessory-cell-independent system of BCR and CD40 costimulation. METHODS: B lymphocytes from 21 HIV-1-infected patients were purified by immunomagnetic cell separation and costimulated with immobilized anti-CD40 monoclonal antibodies and Staphylococcus aureus Cowan I particles in the presence of interleukin (IL)-2 and IL-10. Homotypic aggregate formation, apoptosis, cell cycle entrance, proliferation and Ig secretion of B cells were analysed. RESULTS: Costimulation by the BCR and CD40 induced proliferation and differentiation of B lymphocytes into Ig-secreting cells in 13 patients (group I) but not in eight patients (group II). For three patients in group II, the dual triggering induced apoptosis of B cells. The unexpected inability of these cells to differentiate was associated with a high CD38 expression and a weak spontaneous production of Ig or anti-HIV-1 antibodies in patients with a high viral load and a low CD4+ lymphocyte count. Despite this anomaly, the B cells from group II were able to progress through the cell cycle after stimulation with a combination of phorbol ester and ionomycin in complete medium, suggesting an impairment in BCR and CD40 early signal transduction. CONCLUSION: Intrinsic in vitro hyporeactivity of B lymphocytes to dual triggering of BCR and CD40 was observed in advanced HIV-1 disease and appeared to be related to in vivo hyperactivation of B cells.

JOURNAL ARTICLE Adult Antibodies, Monoclonal Antigens, CD40/*IMMUNOLOGY Apoptosis B-Lymphocytes/*IMMUNOLOGY Cell Cycle Cell Differentiation Enzyme-Linked Immunosorbent Assay Female Human HIV Antibodies/BLOOD HIV Infections/*IMMUNOLOGY *HIV-1 IgG/BLOOD Immunomagnetic Separation Lymphocyte Transformation Male Middle Age Receptors, Antigen, B-Cell/*IMMUNOLOGY Support, Non-U.S. Gov't Viral Load



 




Information in this article was accurate in January 30, 1999. The state of the art may have changed since the publication date. This material is designed to support, not replace, the relationship that exists between you and your doctor. Always discuss treatment options with a doctor who specializes in treating HIV.