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- W2947296782 abstract "A small group of only seven transcription factors known as STATs (signal transducer and activator of transcription) are considered to be canonical determinants of specific gene activation for a plethora of ligand/receptor systems. The activation of STATs involves a family of four tyrosine kinases called JAK kinases. JAK1 and JAK2 activate STAT1 in the cytoplasm at the heterodimeric gamma interferon (IFN γ ) receptor, while JAK1 and TYK2 activate STAT1 and STAT2 at the type I IFN heterodimeric receptor. The same STATs and JAKs are also involved in signaling by functionally different cytokines, growth factors, and hormones. Related to this, IFN γ -activated STAT1 binds to the IFN γ -activated sequence (GAS) element, but so do other STATs that are not involved in IFN γ signaling. Activated JAKs such as JAK2 and TYK2 are also involved in the epigenetics of nucleosome unwrapping for exposure of DNA to transcription. Furthermore, activated JAKs and STATs appear to function coordinately for specific gene activation. These complex events have not been addressed in canonical STAT signaling. Additionally, the function of noncoding enhancer RNAs, including their role in enhancer/promoter interaction is not addressed in the canonical STAT signaling model. In this perspective, we show that JAK/STAT signaling, involving membrane receptors, is essentially a variation of cytoplasmic nuclear receptor signaling. Focusing on IFN signaling, we showed that ligand, IFN receptor, the JAKs, and the STATs all undergo endocytosis and ATP-dependent nuclear translocation to promoters of genes specifically activated by IFNs. We argue here that the vacuolar ATPase (V-ATPase) proton pump probably plays a key role in endosomal membrane crossing by IFNs for receptor cytoplasmic binding. Signaling of nuclear receptors such as those of estrogen and dihydrotestosterone provides templates for making sense of the specificity of gene activation by closely related cytokines, which has implications for lymphocyte phenotypes." @default.
- W2947296782 created "2019-06-07" @default.
- W2947296782 creator A5023962326 @default.
- W2947296782 creator A5040070946 @default.
- W2947296782 creator A5086247539 @default.
- W2947296782 date "2019-05-28" @default.
- W2947296782 modified "2023-10-18" @default.
- W2947296782 title "Noncanonical IFN Signaling, Steroids, and STATs: A Probable Role of V-ATPase" @default.
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- W2947296782 doi "https://doi.org/10.1155/2019/4143604" @default.
- W2947296782 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6558600" @default.
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- W2947296782 hasPublicationYear "2019" @default.
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