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. 1990 May;87(9):3309–3313. doi: 10.1073/pnas.87.9.3309

Interleukin 6 dependence of spontaneous in vitro differentiation of B cells from patients with IgM gammapathy.

Y Levy 1, J P Fermand 1, S Navarro 1, C Schmitt 1, W Vainchenker 1, M Seligmann 1, J C Brouet 1
PMCID: PMC53889  PMID: 2333285

Abstract

Blood B cells from eight patients with clonal lymphoid disorders characterized by monoclonal IgM secretion (four with malignant plasmacytic proliferation typical of Waldenström macroglobulinemia and four without overt lymphoid neoplasia) were found to spontaneously differentiate in vitro into plasma cells. In all instances, monoclonal plasma cells (8-45% of the cells) were generated from extensively purified B cells or T-cell-depleted peripheral blood mononuclear cells after a 7-day culture period, with a corresponding high rate of IgM secretion into the culture medium. This differentiation occurred in the absence of any cell proliferation process as measured by [3H]thymidine uptake at day 2 or 4. Normal B cells did not differentiate under the same experimental conditions. Detection of interleukin 6 (IL-6) bioactivity in all patients' B-cell culture supernatants as well as of IL-6 mRNA in freshly prepared, uncultured B cells in the two cases studied by in situ hybridization suggested that IL-6 secretion by B cells may play a role in this process. Moreover, in the four patients without overt lymphoid proliferation, B-cell differentiation was significantly inhibited (60-80%) in the presence of anti-IL-6 antibodies. In contrast, anti-IL-6 antibodies did not preclude the differentiation into plasma cells of B cells from the four patients with bona fide Waldenström macroglobulinemia. These results suggest a two-step pathogenesis for such human lymphoplasmacytic clonal proliferations, the initial stage being characterized by an IL-6-dependent autocrine differentiation pathway.

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Selected References

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