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Experimental Therapeutics |
Lung Cancer Program and Department of Medicine, University of Colorado Cancer Center, University of Colorado Health Sciences Center, Denver, Colorado 80262 [A. F. S., B. H., D. C. C., L. E. H., P. A. B.], and Laboratory of Biochemical Pharmacology, Memorial Sloan-Kettering Cancer Center and Cornell University Graduate School of Medical Sciences, New York, New York 10021 [T-C. C.]
Non-small cell lung cancer (NSCLC) cells have constitutively high expression of cytosolic phospholipase A2 (cPLA2) and cyclooxygenase (COX) 2. These NSCLC cells also have increased prostaglandin expression (PGE2). Many lung cancers also express 12-lipoxygenase RNA and 12-lipoxygenase protein and biosynthesize 12(S)-hydroxyeicosatetraenoic acid, which correlates with their metastatic potential. Several studies have demonstrated that COX-1 and COX-2 inhibitors could inhibit the in vitro growth of human lung cancer cell lines. In this report, we evaluated the growth-inhibitory effects of sulindac sulfide, a COX-1 and COX-2 inhibitor; exisulind (sulindac sulfone), a novel proapoptotic agent that does not inhibit COX enzymes; and nordihydroguaiaretic acid (NDGA), a lipoxygenase inhibitor on human lung cancer cell lines. We compared these effects with those of 13-cis-retinoic acid, a chemoprevention agent, and with the cytotoxic chemotherapeutic agents paclitaxel and cisplatin, alone or in combination. Our goal was to develop new chemoprevention and treatment strategies. Each of the six agents tested inhibited the in vitro growth of three NSCLC and three SCLC cell lines at the highest concentration. Paclitaxel was the most potent agent (IC50 = 0.003–0.150 µM); sulindac sulfide, NDGA, and 13-cis-retinoic acid had intermediate potency (IC50 = 4–80 µM), and cisplatin and exisulind were the least potent (IC50 = 150–500 µM). Combination studies showed synergistic interactions for sulindac sulfide, exisulind, and NDGA with paclitaxel, cisplatin, and 13-cis-retinoic acid, regardless of drug-resistance phenotype. At high concentrations, the combination of 13-cis-retinoic acid and each of the five other drugs resulted in a strong synergistic effect. These studies provide a rationale for chemoprevention (exisulind ± retinoic acid ± NDGA) and therapeutic (exisulind ± paclitaxel ± cisplatin) studies in patients at risk for, or with, lung cancer.
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