The Journal of Immunology, Vol 158, Issue 7 3054-3061, Copyright © 1997 by American Association of Immunologists

ARTICLES

Modulation of the p27kip1 cyclin-dependent kinase inhibitor expression during IL-4-mediated human B cell activation

DA Blanchard, MT Affredou and A Vazquez
INSERM Unit 131-IPSC, Clamart, France.

IL-4 activates resting B cells and, in conjunction with cosignals such as anti-IgM (anti-mu) Ab or CD40 ligand, modulates progression of B cells through the cell cycle, leading to proliferation. In this study, we show that the mitogenic combination of IL-4 and anti-mu Ab triggered induction of cyclin D3 and up-regulated cyclin-dependent kinase (cdk) 6 expression, whereas such regulation was not observed in B cells activated by IL-4 or anti-mu Ab alone. Furthermore, cyclin D3 immunoprecipitated fron as associated with cdk6, and the cyclin D3/cdk6 complex was able to phosphorylate recombinant retinoblastoma protein in vitro. In addition, B cells activated with either IL-4 or 1L-13 alone expressed a higher amount of p27kip1 (p27) cdk inhibitor than nonstimulated cells. In contrast, p27 expression was decreased when cells were activated with mitogenic combinations of IL-4 and anti-mu Ab or anti-CD40 mAb. We also observed that the IL-4-mediated inhibition of the proliferation of anti-mu/IL-2- or anti-mu/phorbol 12,13-dibutyrate- activated human leukemic B cells was associated with the maintenance of large amounts of p27 in these cells. These data suggest that IL-4 controls B cell proliferation by action during at least two steps of the regulation of the cell cycle, cyclin D3/cdk6 complex regulation and p27 inhibitor expression.

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