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Article Abstract
Innate lymphoid cells (ILCs) ensure protection against pathogens by quickly reacting to the alterations of the cytokine milieu taking place upon infection. More than 50 cytokines and growth factors activate the Janus kinases (JAKs), leading to phosphorylation of members of the signal transducer and activator of transcription (STAT) family. Activation of STATs induces specific transcriptional programs which are associated with distinct cellular outcomes. Thus, an efficient measurement of rapid STAT phosphorylation enables not only to dissect the spectrum of cytokine sensitivity among ILC subsets but also to pinpoint specific transcriptional programs and cellular functions initiated after activation. Using this method, we have previously dissected the downstream events of Interleukin (IL)-23 and IL-12 signaling in ILCs, shedding light on the differential usage of STATs among ILC subsets. Here, we provide an optimized and detailed protocol describing how to analyze phosphorylation of STAT transcription factors in murine NK and ILC subsets isolated from different tissues.
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