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• W2114051326 abstract "Abstract Lysophosphatidic acid receptors stimulate a Gα12/13/RhoA-dependent gene transcription program involving the serum response factor (SRF) and its coactivator and oncogene, megakaryoblastic leukemia 1 (MKL1). Inhibitors of this pathway could serve as useful biological probes and potential cancer therapeutic agents. Through a transcription-based high-throughput serum response element-luciferase screening assay, we identified two small-molecule inhibitors of this pathway. Mechanistic studies on the more potent CCG-1423 show that it acts downstream of Rho because it blocks SRE.L-driven transcription stimulated by Gα12Q231L, Gα13Q226L, RhoA-G14V, and RhoC-G14V. The ability of CCG-1423 to block transcription activated by MKL1, but not that induced by SRF-VP16 or GAL4-VP16, suggests a mechanism targeting MKL/SRF-dependent transcriptional activation that does not involve alterations in DNA binding. Consistent with its role as a Rho/SRF pathway inhibitor, CCG-1423 displays activity in several in vitro cancer cell functional assays. CCG-1423 potently (&lt;1 μmol/L) inhibits lysophosphatidic acid–induced DNA synthesis in PC-3 prostate cancer cells, and whereas it inhibits the growth of RhoC-overexpressing melanoma lines (A375M2 and SK-Mel-147) at nanomolar concentrations, it is less active on related lines (A375 and SK-Mel-28) that express lower levels of Rho. Similarly, CCG-1423 selectively stimulates apoptosis of the metastasis-prone, RhoC-overexpressing melanoma cell line (A375M2) compared with the parental cell line (A375). CCG-1423 inhibited Rho-dependent invasion by PC-3 prostate cancer cells, whereas it did not affect the Gαi-dependent invasion by the SKOV-3 ovarian cancer cell line. Thus, based on its profile, CCG-1423 is a promising lead compound for the development of novel pharmacologic tools to disrupt transcriptional responses of the Rho pathway in cancer. [Mol Cancer Ther 2007;6(8):2249–60]" @default.
• W2114051326 created "2016-06-24" @default.
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• W2114051326 date "2007-08-01" @default.
• W2114051326 modified "2023-10-17" @default.
• W2114051326 title "CCG-1423: a small-molecule inhibitor of RhoA transcriptional signaling" @default.
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• W2114051326 doi "https://doi.org/10.1158/1535-7163.mct-06-0782" @default.
• W2114051326 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17699722" @default.
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