The protein encoded by this gene is a member of the STAT protein family. In response to cytokines and growth factors, STAT family members are phosphorylated by the receptor associated kinases, and then form homo- or heterodimers that translocate to the cell nucleus where they act as transcription activators. This protein is activated through phosphorylation in response to various cytokines and growth factors including IFNs, EGF, IL5, IL6, HGF, LIF and BMP2. This protein mediates the expression of a variety of genes in response to cell stimuli, and thus plays a key role in many cellular processes such as cell growth and apoptosis. The small GTPase Rac1 has been shown to bind and regulate the activity of this protein. PIAS3 protein is a specific inhibitor of this protein. This gene also plays a role in regulating host response to viral and bacterial infections. Mutations in this gene are associated with infantile-onset multisystem autoimmune disease and hyper-immunoglobulin E syndrome.

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Flow cytometric analysis of Stat3 expression in C2C12 cells using Stat3 antibody . Green, isotype control; red, Stat3.

Immunocytochemical staining of HepG2 cells with Stat3Antibody antibody . Nuclei were stained blue with DAPI; Stat3Antibody was stained magenta with Alexa Fluor® 647. Images were taken using Leica stellaris 5. Protein abundance based on laser Intensity and smart gain: Medium. Scale bar, 20 μm.

Western blotting analysis using Stat3 antibody . Total cell lysates (30 μg) from various cell lines were loaded and separated by SDS-PAGE. The blot was incubated with Stat3 antibody and HRP-conjugated goat anti rabbit secondary antibody respectively. Image was developed using FeQ™ ECL Substrate Kit .

Western blotting analysis using Stat3 antibody . Stat3 expression in wild type (WT) and Stat3 shRNA knockdown (KD) HT-1080 cells with 30 μg of total cell lysates. β-Tubulin serves as a loading control. The blot was incubated with Stat3 antibody and HRP-conjugated goat anti rabbit secondary antibody respectively. Image was developed using FeQ™ ECL Substrate Kit .

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