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J Immunol. 2005 Jul 15;175(2):951-8.

Restraint of B cell activation by Foxj1-mediated antagonism of NF-kappa B and IL-6.

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1
Division of Rheumatology, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.

Abstract

The forkhead transcription factor Foxj1 inhibits spontaneous autoimmunity, in part by antagonizing NF-kappaB activation in T cells. We demonstrate here that Foxj1 also inhibits humoral immune responses intrinsically in B cells; Foxj1 deficiency in B cells results in spontaneous and accentuated germinal center formation, associated with the development of pathogenic autoantibodies and accentuated responses to immunizations-all reflecting excessive activity of NF-kappaB and its target gene IL-6, and correlating with a requirement for Foxj1 to regulate the inhibitory NF-kappaB component IkappaBbeta. Thus, Foxj1 restrains B cell activation and the maturation of humoral responses, demonstrating a critical role for at least this forkhead transcription factor in the regulation of B lymphocyte homeostasis.

PMID:
16002694
[Indexed for MEDLINE]
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