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CHEMOTHERAPY, ANTIBIOTICS, AND GENE THERAPY

P-Glycoprotein-Independent Apoptosis Induction by a Novel Synthetic Compound, MMPT [5-[(4-Methylphenyl)methylene]-2-(phenylamino)-4(5H)-thiazolone]

Department of Thoracic and Cardiovascular Surgery, University of Texas M.D. Anderson Cancer Center, Houston, Texas (F.T., S.W., J.S., L.Z., H.-B.Z., J.J.D., B.F.); and Program in Gene Therapy and Virology, University of Texas Graduate School of Biomedical Sciences, Houston, Texas (J.J.D., B.F.)

To develop new anticancer agents that are effective for treatment of chemoresistant tumors, we screened a chemical library for compounds that can effectively kill both paclitaxel-sensitive lung cancer cell H460 and P-glycoprotein-overexpressing paclitaxel-resistant cell H460/TaxR. A synthetic compound, MMPT (5-[(4-methylphenyl)methylene]-2-(phenylamino)-4(5H)-thiazolone), was identified to induce cytotoxic effects in both H460 and H460/TaxR cells but not in normal fibroblasts. MMPT effectively inhibited the growth of several human lung cancer cell lines in a dose-dependent manner, with 50% inhibitory concentrations ranging from 4.9 to 8.0 µM. The inhibitory effect on cancer cells is independent of the status of p53 and P-glycoprotein. Moreover, MMPT had no obvious toxic effects on normal human fibroblasts and mesenchymal stem cells at the 50% inhibitory concentration for lung cancer cell lines. Treating lung cancer cells with MMPT-induced apoptosis with caspase-3, -8, -9, and poly(ADP-ribose) polymerase cleavage and cytochrome c release from mitochondria. MMPT-induced apoptosis was abrogated when c-Jun N-terminal kinase (JNK) activation was blocked with a specific JNK inhibitor, SP600125. Furthermore, in vivo administration of MMPT suppressed human H460 xenograft tumor growth in nude mice. Our results suggest that MMPT may induce tumor-selective cell killing in both P-glycoprotein-negative and -positive cancer cells and could be a new anticancer agent for treatment of refractory tumors.

Address correspondence to: Dr. Bingliang Fang, Department of Thoracic and Cardiovascular Surgery, Unit 445, University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030. E-mail: bfang{at}mdanderson.org

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