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Volume 271, Number 34, Issue of August 23, 1996 pp. 20914-20921
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

Characterization of a New Isoform of the NFAT (Nuclear Factor of Activated T Cells) Gene Family Member NFATc

(Received for publication, April 22, 1996, and in revised form, June 6, 1996)

Jungchan Park , Atsuko Takeuchi and Surendra Sharma

From the Section of Experimental Pathology, Department of Pathology, Roger Williams Medical Center-Brown University, Providence, Rhode Island 02908

The cyclosporin A (CsA)/FK506-sensitive nuclear factor of activated T cells (NFAT) plays a key role in the inducible expression of cytokine genes in T cells. Although NFAT has been recently shown to be inducible in several non-T immune cells, the NFAT gene family members characterized to date have been isolated only from T cells. To further characterize NFAT function in human B cells and to demonstrate cytokine gene specificity of NFAT proteins, we report here the isolation and characterization of a cDNA clone from the Raji B cell line. The cDNA clone encodes a new isoform, NFATc.beta , of the NFAT gene family member NFATc (designated here NFATc.alpha ). The amino acid sequence of NFATc.beta differs from that of NFATc.alpha in the first NH2-terminal 29 residues and contains an additional region of 142 residues at the COOH terminus. Northern analysis using a probe encompassing a common region of both isoforms showed two mRNA species of 2.7 and 4.5 kilobase pairs, while an NFATc.beta -specific probe detected only the 4.5-kilobase pair mRNA which was preferentially expressed in the spleen. Transient expression of NFATc.beta was capable of activating an interleukin-2 NFAT-driven reporter gene in stimulated Jurkat cells in a CsA-sensitive manner. However, NFATc.beta neither bound to the kappa 3 element (an NFAT-binding site) in the tumor necrosis factor-alpha promoter nor activated the tumor necrosis factor-alpha promoter in cotransfection assays. These data suggest that different members or isoforms of NFAT gene family may regulate inducible expression of different cytokine genes.


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