The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1999/12/1837/ $5.00
The Journal of Experimental Medicine, Volume 190, Number 12, December 20, 1999 1837-1848


Original Article

Lineage-specific Modulation of Interleukin 4 Signaling by Interferon Regulatory Factor 4

Sanjay Guptaa, Man Jianga, Alissa Anthonya, and Alessandra B. Pernisa
a Department of Medicine, Columbia University, New York, New York 10032

Correspondence to: Alessandra B. Pernis, Department of Medicine, Columbia University, 630 West 168th St., New York, NY 10032. Tel:212-305-3763 Fax:212-305-4478 E-mail:abp1{at}columbia.edu.

Interleukin (IL)-4 is an immunoregulatory cytokine that exerts distinct biological activities on different cell types. Our studies indicate that interferon regulatory factor (IRF)-4 is both a target and a modulator of the IL-4 signaling cascade. IRF-4 expression is strongly upregulated upon costimulation of B cells with CD40 and IL-4. Furthermore, we find that IRF-4 can interact with signal transducer and activator of transcription (Stat)6 and drive the expression of IL-4–inducible genes. The transactivating ability of IRF-4 is blocked by the repressor factor BCL-6. Since expression of IRF-4 is mostly confined to lymphoid cells, these data provide a potential mechanism by which IL-4–inducible genes can be regulated in a lineage-specific manner.

Key Words: CD40, interleukin 4, signal transducer and activator of transcription 6, BCL-6, interferon regulatory factor 4


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