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Altered Interleukin-12 Responsiveness in Th1 and Th2 Cells Is
Associated With the Differential Activation of STAT5 and STAT1
Jared A. Gollob,
Erin A. Murphy,
Sudipta Mahajan,
Claudia P. Schnipper,
Jerome Ritz, and
David A. Frank
From the Department of Adult Oncology, Dana-Farber Cancer Institute,
Department of Medicine, Harvard Medical School, Boston, MA.
T-cell activation in response to interleukin-12 (IL-12) is mediated
through signaling events that include the tyrosine phosphorylation of
STAT4. IL-12 responsiveness and the ability of IL-12 to activate STAT4
is different in T cells induced to differentiate into a Th1 or Th2
phenotype. In this report, we show that STAT5, STAT1 , and STAT1 ,
in addition to STAT4, are tyrosine phosphorylated in response to IL-12
in phytohemagglutinin (PHA)-activated human T cells. To understand how
the activation of these STATs contributes to T-cell IL-12
responsiveness, we analyzed the IL-12-induced activation of STAT5 and
STAT1 in T cells stimulated to undergo Th1 or Th2 differentiation. The
IL-12-induced tyrosine phosphorylation of STAT5 and STAT1, but not
STAT4, is augmented in T cells activated into Th1 cells with PHA + interferon- (IFN- ) compared with T cells activated with PHA
alone. STAT5 DNA binding induced by IL-12 is also augmented in T cells
activated with PHA + IFN- compared with T cells activated with PHA
alone, whereas STAT4 DNA binding is not increased. In contrast, the
IL-12-induced activation of these STATs is inhibited in T cells
activated into Th2 cells with PHA + IL-4. The enhancement of IL-12
signaling by IFN- is not a direct effect of IFN- on T cells, but
rather is mediated by IL-12 that is produced by antigen-presenting
cells in response to IFN- . This positive autoregulatory effect of
IL-12 on the activation of select STATs correlates with an increase in
T-cell IFN- production in response to IL-12. These findings suggest that the activation of STAT5 and STAT1 may augment select
STAT4-dependent functional responses to IL-12 in Th1 cells.
Blood, Vol. 91 No. 4 (February 15), 1998:
pp. 1341-1354
© 1998 by The American Society of Hematology.

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