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Originally published In Press as doi:10.1074/jbc.M201207200 on May 22, 2002
J. Biol. Chem., Vol. 277, Issue 30, 27169-27175, July 26, 2002
Interleukin-4-mediated Protection of Primary B Cells from
Apoptosis through Stat6-dependent Up-regulation of
Bcl-xL*
Andrea L.
Wurster ,
Vikki L.
Rodgers ,
Morris F.
White§,
Thomas L.
Rothstein¶, and
Michael J.
Grusby **
From the Department of Immunology and Infectious
Diseases, Harvard School of Public Health and § Howard
Hughes Medical Institute, Joslin Diabetes Center, Harvard Medical
School, Boston, Massachusetts 02115, ¶ Departments of Medicine and
Microbiology and the Evans Memorial Department of Clinical Research,
Boston University Medical Center, Boston, Massachusetts 02118, and
Department of Medicine, Harvard Medical School,
Boston, Massachusetts 02115
Apoptosis is an integral aspect of B lymphocyte
development and homeostasis and is regulated by the engagement of
antigen costimulatory and cytokine receptors. Although it is well
established that interleukin 4 (IL-4) is a potent anti-apoptotic
cytokine for B lymphocytes, little is known about the IL-4-induced
molecular events regulating cell survival. Stat6 is rapidly activated
after IL-4 stimulation, but its role in B lymphocyte apoptosis has not been explored. In this report we demonstrate that Stat6 is a critical signaling molecule for IL-4 in protecting primary B cells from passive
and Fas-induced cell death. We show that expression of the Bcl-2 family
member, Bcl-xL, is induced maximally by IL-4 and anti-IgM/IL-4 in a
Stat6-dependent manner. Additionally, we demonstrate that
bcl-xL transcription is likely to be directly activated
through a Stat6 binding site in the bcl-xL-flanking region.
Finally, reconstitution of Stat6-deficient splenic B cells with Bcl-xL
was able to protect those cells from Fas-induced cell death. These
results suggest that the anti-apoptotic activity of IL-4 in B cells is
mediated through the activation of Stat6 and subsequent transcription
of Bcl-xL.
*
This work was supported by National Institutes of Health
Grants AI40171 (to M. J. G.) and AI40181 (to T. L. R.) and by the Mathers Foundation (to M. J. G.).The costs of publication of this article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
**
A scholar of the Leukemia and Lymphoma Society. To whom
correspondence should be addressed. Tel.: 617-432-1240; Fax:
617-432-0084; E-mail: mgrusby@hsph.harvard.edu.
Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2002 by the American Society for Biochemistry and Molecular Biology.
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