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Influence of 15 retinoic acid amides on urinary bladder carcinogenesis in the mouse
Abstract:
A series of experiments was conducted to determine the efficacy of 15 synthetic retinoic acid amides (retinamides) as inhibitors of chemical carcinogenesis of the urinary bladder in C57BL/6 x DBA/2F1 mice. Eight of the retinamides tested had significant protective activity when administered at nontoxic levels in the diet. Minor structural alterations, such as the addition of a methyl or hydroxyl group to the terminal amide moiety had a major influence on the anticarcinogenic activity of the retinamides. Although 13-cis retinamides generally were less toxic on a molar basis than were their all-trans isomers, no consistent pattern of differential anticarcinogenic activity was noted among the six pairs of all-trans and 13-cis isomers tested. All-trans-4-hydroxyphenyl retinamide was among the most active and least toxic of the retinoids tested, and appears to be the compound of choice for further study.
Insights
Researchers tested 15 synthetic retinoic acid amides (retinamides) for their ability to prevent bladder cancer in mice. Eight retinamides showed significant protective effects, with structural changes greatly impacting their efficacy.
Area of Science:
- Oncology
- Medicinal Chemistry
- Toxicology
Background:
- Chemical carcinogenesis poses a significant health risk, particularly for urinary bladder cancer.
- Synthetic retinoic acid amides (retinamides) are being investigated for their potential chemopreventive properties.
- Understanding structure-activity relationships is crucial for developing effective anticancer agents.
Purpose of the Study:
- To evaluate the efficacy of 15 synthetic retinamides as inhibitors of chemical carcinogenesis in the urinary bladder.
- To identify specific retinamides with significant anticarcinogenic activity and favorable toxicity profiles.
- To explore the influence of structural modifications on the chemopreventive activity of retinamides.
Main Methods:
- Administration of 15 synthetic retinamides to C57BL/6 x DBA/2F1 mice models of chemical carcinogenesis.
- Assessment of protective activity at non-toxic dietary levels.
- Evaluation of toxicity and structure-activity relationships, including comparisons between all-trans and 13-cis isomers.
Main Results:
- Eight of the 15 tested retinamides demonstrated significant protective activity against urinary bladder carcinogenesis.
- Minor structural modifications, such as methyl or hydroxyl group additions, substantially influenced anticarcinogenic efficacy.
- While 13-cis isomers were generally less toxic, no consistent difference in anticarcinogenic activity was observed compared to their all-trans counterparts.
- All-trans-4-hydroxyphenyl retinamide emerged as a highly effective and well-tolerated compound.
Conclusions:
- Synthetic retinamides hold promise as chemopreventive agents against urinary bladder cancer.
- Structural optimization is key to maximizing the anticarcinogenic potential of retinamides.
- All-trans-4-hydroxyphenyl retinamide is a strong candidate for further preclinical and clinical investigation.