Impairment of B-lymphocyte differentiation induced by dual triggering of the B-cell antigen receptor and CD40 in advanced HIV-1-disease.
AIDS 1998;
12:1437-49. [PMID:
9727564 DOI:
10.1097/00002030-199812000-00005]
[Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
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.
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