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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1996 Sep 3;93(18):9499–9504. doi: 10.1073/pnas.93.18.9499

Inhibition of cytokines and JAK-STAT activation by distinct signaling pathways.

T K Sengupta 1, E M Schmitt 1, L B Ivashkiv 1
PMCID: PMC38457  PMID: 8790359

Abstract

An important component of cytokine regulation of cell growth and differentiation is rapid transcriptional activation of genes by the JAK-STAT (signal transducer and activator of transcription) signaling pathway. Ligation of cytokine receptors results in tyrosine phosphorylation and activation of receptor-associated Jak protein tyrosine kinases and cytoplasmic STAT transcription factors, which then translocate to the nucleus. We describe the interruption of cytokine triggered JAK-STAT signals by cAMP, the calcium ionophore ionomycin, and granulocyte/macrophage colony-stimulating factor. Jak1 kinase activity, interleukin 6-induced gene activation, Stat3 tyrosine phosphorylation, and DNA-binding were inhibited, as was activation of Jak1 and Stat1 by interferon gamma. The kinetics and requirement for new RNA and protein synthesis for inhibition of interleukin 6 by ionomycin and GM-CSF differed, but both agents increased the association of Jak1 with protein tyrosine phosphatase ID (SH2-containing phosphatase 2). Our results demonstrate that crosstalk with distinct signaling pathways can inhibit JAK-STAT signal transduction, and suggest approaches for modulating cytokine activity during immune responses and inflammatory processes.

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