Abstract
The role of paf-acether (paf), a phospholipid cytokine, in the modulation of human B cell function was investigated. Paf, from 1×10−5 M to 10−6 M, decreased B cell proliferation induced by both phorbol myristate acetate (PMA) and anti-IgM antibodies (anti-IgM Ab). By contrast, 1×10−7 M to 1×10−9 M paf enhanced PMA triggered, but not anti-IgM triggered B cell proliferation. B cell proliferation was modulated between 24 and 72 hr of culture indicating that the effect of paf did not merely reflect a shift in proliferation kinetics. Interestingly, paf also enhanced the spontaneous proliferation of a Burkitt lymphoma-derived B cell line, Raji, which suggests that paf can directly act on B cells. The modulatory effect of paf on peripheral blood B cells was independent of PMA concentration, yet the effect on Raji cells was dependent upon cell density. The data suggest that paf is a potent modulator of B cell function, and may be involved in the control of humoral immune response.
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Abbreviations
- anti-IgM Ab:
-
anti-IgM antibodies
- EBV:
-
Epstein-Barr virus
- FCS:
-
fetal calf serum
- HSA:
-
human serum albumin
- IL:
-
interleukin
- paf:
-
paf-acether, 1-O-alkyl-2-acetyl-sn-glycero-3-phosphocholine
- PHA:
-
phytohemagglutinin A
- PKC:
-
protein kinase C
- PMA:
-
phorbol myristate acetate
- TNF:
-
tumor necrosis factor
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Leprince, C., Vivier, E., Treton, D. et al. Immunoregulatory functions of paf-acether. VI. Dual effect on human B cell proliferation. Lipids 26, 1204–1208 (1991). https://doi.org/10.1007/BF02536532
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DOI: https://doi.org/10.1007/BF02536532