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J Biol Chem, Vol. 274, Issue 36, 25855-25861, September 3, 1999

Distinct Roles for STAT1, STAT3, and STAT5 in Differentiation Gene Induction and Apoptosis Inhibition by Interleukin-9

Jean-Baptiste DemoulinDagger , Emiel Van RoostDagger , Monique StevensDagger , Bernd Groner, and Jean-Christophe RenauldDagger

From the Dagger  Ludwig Institute for Cancer Research and the Experimental Medicine Unit, Université Catholique de Louvain, avenue Hippocrate, 74, B-1200 Brussels, Belgium and the  Institute for Experimental Cancer Research, Tumor Biology Center, Breisacher Strasse 117, D-79106 Freiburg, Germany

Interleukin-9 (IL-9) activates three distinct STAT proteins: STAT1, STAT3, and STAT5. This process depends on one tyrosine of the IL-9 receptor, which is necessary for proliferation, gene induction, and inhibition of apoptosis induced by glucocorticoids. By introduction of point mutations in amino acids surrounding this tyrosine, we obtained receptors that activated either STAT5 alone or both STAT1 and STAT3, thus providing us with the possibility to study the respective roles of these factors in the biological activities of IL-9. Both mutant receptors were able to prevent apoptosis, but only the mutant that activated STAT1 and STAT3 was able to support induction of granzyme A and L-selectin. In line with these results, constitutively activated STAT5 blocked glucocorticoid-induced apoptosis. In Ba/F3 cells, significant proliferation and pim-1 induction were observed with both STAT-restricted mutants, though proliferation was lower than with the wild-type receptor. These results suggest that survival and cell growth are redundantly controlled by multiple STAT factors, whereas differentiation gene induction is more specifically correlated with individual STAT activation by IL-9.

Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.
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