Optimization of novel nipecotic bis (amide) inhibitors of the Rho/MKL1/SRF transcriptional pathway as potential anti-metastasis agents

JL Bell, AJ Haak, SM Wade, PD Kirchhoff… - Bioorganic & medicinal …, 2013 - Elsevier
JL Bell, AJ Haak, SM Wade, PD Kirchhoff, RR Neubig, SD Larsen
Bioorganic & medicinal chemistry letters, 2013Elsevier
CCG-1423 (1) is a novel inhibitor of Rho/MKL1/SRF-mediated gene transcription that
inhibits invasion of PC-3 prostate cancer cells in a Matrigel model of metastasis. We recently
reported the design and synthesis of conformationally restricted analogs (eg, 2) with
improved selectivity for inhibiting invasion versus acute cytotoxicity. In this study we
conducted a survey of aromatic substitution with the goal of improving physicochemical
parameters (eg, ClogP, MW) for future efficacy studies in vivo. Two new compounds were …
CCG-1423 (1) is a novel inhibitor of Rho/MKL1/SRF-mediated gene transcription that inhibits invasion of PC-3 prostate cancer cells in a Matrigel model of metastasis. We recently reported the design and synthesis of conformationally restricted analogs (e.g., 2) with improved selectivity for inhibiting invasion versus acute cytotoxicity. In this study we conducted a survey of aromatic substitution with the goal of improving physicochemical parameters (e.g., ClogP, MW) for future efficacy studies in vivo. Two new compounds were identified that attenuated cytotoxicity even further, and were fourfold more potent than 2 at inhibiting PC-3 cell migration in a scratch wound assay. One of these (8a, CCG-203971, IC50=4.2μM) was well tolerated in mice for 5days at 100mg/kg/day i.p., and was able to achieve plasma levels exceeding the migration IC50 for up to 3h.
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