Abstract:
:Epidemiological and animal studies have demonstrated that vitamin A and its natural and synthetic derivatives, retinoids, are effective agents in preventing the development of tobacco-associated cancers. Unfortunately, clinical trials of retinoids on cigarette smokers have shown lack of efficacy in preventing lung cancer. In our study, we investigated the effect of nicotine on the anti-cancer activity of all trans-retinoic acid (trans-RA) in human lung cancer cells. Our results demonstrated that nicotine could abrogate the growth inhibitory effect of trans-RA by suppressing its ability to induce the expression of RA receptor beta (RAR beta), a tumor suppressor. The inhibitory effect of nicotine was accompanied with induction of orphan receptor TR3. Inhibition of TR3 expression by overexpression of TR3 anti-sense RNA in H460 lung cancer cells strongly prevented the suppressive effect of nicotine on trans-RA activity. Treatment with nicotine or the cotransfection of TR3 expression vector inhibited the induction of RAR beta promoter activity by trans-RA in transient transfection assays. The inhibition of RAR beta promoter activity was due to the interaction of TR3 with orphan receptor COUP-TF, resulting in inhibition of COUP-TF DNA binding and transactivation on the RAR beta promoter. Furthermore, we found that nicotine failed to suppress the effect of a retinoid X receptor (RXR)-selective retinoid SR11237 on inducing both growth inhibition and RAR beta promoter activity, due to the ability of SR11237 to activate the RAR beta promoter through the RXR/TR3 heterodimer. Together, our results demonstrate that nicotine suppresses the growth inhibitory effects of trans-RA by inhibiting RAR beta expression through its induction of TR3 expression and suggest that RXR-selective retinoids may be more effective than classical retinoids for preventing and treating tobacco-associated cancers.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Chen GQ,Lin B,Dawson MI,Zhang XKdoi
10.1002/ijc.10304keywords:
subject
Has Abstractpub_date
2002-05-10 00:00:00pages
171-8issue
2eissn
0020-7136issn
1097-0215journal_volume
99pub_type
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