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American Health Foundation, Valhalla, New York 06595 [J. L. W., B. R.]; Division of Gastroenterology [J. L. W., I. H., E. C., B. R.] and Brader Cancer Canter [F. T.], New York Medical College, Valhalla, New York 06595; and Strang Cancer Prevention Center [S. B.] and Rockefeller University [B. R.], New York, New York 10021
Nitric oxide-releasing nonsteroidal anti-inflammatory drugs (NO-NSAIDs), consisting of a known nonsteroidal anti-inflammatory drug (NSAID) and a nitric oxide (NO)-releasing group, are reported safer than NSAIDs. To assess their potential in colon cancer chemoprevention, we studied in vitro the effect of NO-aspirin, NO-sulindac, and NO-ibuprofen on colonocyte kinetics. These three NO-NSAIDs reduced the growth of cultured HT-29 colon adenocarcinoma cells much more effectively than the corresponding NSAIDs; e.g., at 24 h, their IC50 values were as follows: (a) aspirin, >5000 µM; (b) NO-aspirin, 1 µM; (c) sulindac, 750 µM; (d) NO-sulindac, 150 µM; (e) ibuprofen, >1000 µM; and (f) NO-ibuprofen, 42 µM. This effect was due to inhibition of proliferation and induction of apoptosis and perhaps to the induction of novel cell changes, characterized by extensive DNA degradation. NO-NSAIDs also blocked the G0-G1 to S cell cycle transition. Their superior effectiveness compared with traditional NSAIDs, combined with their reported safety, makes them promising candidates for chemopreventive agents against colon cancer.
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