Thymic stromal lymphopoietin-mediated STAT5 phosphorylation via kinases JAK1 and JAK2 reveals a key difference from IL-7-induced signaling

Yrina Rochman, Mohit Kashyap, Gertraud W. Robinson, Kazuhito Sakamoto, Julio Gomez-Rodriguez, Kay Uwe Wagner, Warren J. Leonard

Research output: Contribution to journalArticle

110 Scopus citations

Abstract

Thymic stromal lymphopoietin (TSLP) is a type I cytokine that plays essential roles in allergic/inflammatory skin and airway disorders, in helminth infections and in regulating intestinal immunity. TSLP signals via IL-7Rα and a specific TSLPR subunit that is highly related to the common cytokine receptor γ chain, γc. Although TSLP has effects on a broad range of hematopoetic cells and can induce STAT5 phosphorylation, TSLP was reported to not signal via JAK kinases, and the mechanismby which TSLP regulates STAT5 phosphorylation has been unclear. Wenowdemonstrate the role of JAK1 and JAK2 in TSLP-mediated STAT5 phosphorylation in mouse and human primary CD4+ T cells, in contrast to the known activation of JAK1 and JAK3 by the related cytokine, IL-7. We also show that just as JAK1 interacts with IL-7Rα, JAK2 is associated with TSLPR protein. Moreover, we demonstrate the importance of STAT5 activation for TSLPmediated survival and proliferation of CD4+ T cells. These findings clarify the basis for TSLP-mediated signaling and provide an example wherein a cytokine uses JAK1 and JAK2 to mediate the activation of STAT5.

Original languageEnglish (US)
Pages (from-to)19455-19460
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number45
DOIs
StatePublished - Nov 9 2010

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