The role of recombinant B cell stimulatory factor 2 (BSF-2/IL-6) in the regulation of growth and differentiation of B cells was investigated. rBSF-2 at 200 pg/ml could induce 50% of the maximum Ig production in B lymphoblastoid cell lines, the specific activity being estimated as 5 X 10(6) U/mg. rBSF-2 augmented PWM-induced IgM, IgG, and IgA production in mononuclear cells (MNC); the effect was exerted by directly acting on PWM-induced B blast cells to induce Ig production. However, rBSF-2 did not induce any growth of activated B cells. In contrast, rBSF-2 showed a potent growth activity on a murine hybridoma clone, MH60.BSF2. The concentration required for half-maximal [3H]TdR uptake was approximately 5 pg/ml, which was 40 times less than that required for Ig induction in a B cell line. Anti-BSF-2 antibody inhibited PWM-induced Ig production in MNC, but not PWM-induced proliferation. The antibody was effective even when added on day 4 of an 8-d culture, indicating that BSF-2 is one of the essential late-acting factors in PWM-induced Ig production.
The essential role of B cell stimulatory factor 2 (BSF-2/IL-6) for the terminal differentiation of B cells.
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A Muraguchi, T Hirano, B Tang, T Matsuda, Y Horii, K Nakajima, T Kishimoto; The essential role of B cell stimulatory factor 2 (BSF-2/IL-6) for the terminal differentiation of B cells.. J Exp Med 1 February 1988; 167 (2): 332–344. doi: https://doi.org/10.1084/jem.167.2.332
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