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Signaling through small G proteins of the RhoA subfamily, including RhoC, induces actin-regulated cytosolic-to-nuclear translocation of the oncogene product megakaryoblastic leukemia 1 (MKL1), which binds to serum response factor (SRF).1 The MKL1/SRF complex, in turn, activates the transcription of serum response element (SRE) regulated genes, stimulating cell migration, a process that is central to metastasis.1 CCG-203971 is an inhibitor of SRE activation in the prostate cancer cell line PC-3 (IC50 = 6.4 μM), with 87% inhibition of SRE activation achieved at 100 μM.2 This compound also inhibits PC-3 cell migration (IC50 = 4.2 μM), as determined by a scratch wound assay.2 CCG-203971 causes no cytotoxicity when evaluated by WST-1 assay.2 It is well tolerated in normal mice up to doses of 100 mg/kg given intraperitoneally over five days.2
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1. CCG-
2. Optimization of novel nipecotic bis(amide) inhibitors of the Rho/MKL1/SRF transcriptional pathway as potential anti-