STAT3-IN-52 (Compound 9) is a selective and orally active signal transducer and activator of transcription 3 (STAT3) inhibitor. STAT3-IN-52 binds to the pY705 site of STAT3 (Ki = 440 nM), blocking the phosphorylation and dimerization of STAT3. STAT3-IN-52 shows strong cytotoxicity against various cancer cells, such as breast cancer MDA-MB-231 (IC50 = 0.7 μM), medulloblastoma UW426, pancreatic cancer BKPC3 cells. STAT3-IN-52 can induce cell apoptosis, inhibit the STAT3 nuclear transport and DNA binding activity and downregulate the expression of the STAT3 target gene MMP9. STAT3-IN-52
can be used for research related to STAT3 abnormal activation in cancer.
