PMID: 9419348Feb 21, 1998Paper

Regulation of interleukin 4-mediated signaling by naturally occurring dominant negative and attenuated forms of human Stat6

Proceedings of the National Academy of Sciences of the United States of America
B K PatelW J LaRochelle

Abstract

Interleukin (IL)-4-mediated nuclear signaling by Stat6 has been implicated in lymphoid cell proliferation and the transcriptional activation of genes encoding major histocompatability complex (MHC) class II molecules and Fc receptors. To investigate IL-4-mediated transcriptional events, we cloned two naturally occurring human Stat6 isoforms, Stat6b and Stat6c, that encoded an NH2-terminal truncation or an SH2 domain deletion, respectively. Stat6 variant mRNAs were differentially expressed in many human tissues. To elucidate the biologic role of each isoform, we examined the consequences of overexpression in IL-4-responsive FDC-P2 cells. Stat6 and Stat6b (to a lesser extent) enhanced DNA synthesis, up-regulated endogenous MHC class II and Fcgamma receptors, and became tyrosine phosphorylated in response to IL-4 stimulation. In contrast, Stat6c, which lacks functionally critical SH2 domain residues, unexpectedly inhibited IL-4-mediated mitogenesis and cell surface antigen expression and was not tyrosine phosphorylated. Although Stat6c only modestly diminished endogenous Stat6 tyrosine phosphorylation, it abolished endogenous Stat6 FcgammaRI and Iepsilon DNA binding activity and FcgammaRI-luciferase reporter transcriptional activa...Continue Reading

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