Novel pathways and mechanisms of Nicotine-induced oral carcinogenesis

Shetty, Smitha Sammith and Radhakrishnan, Raghu (2022) Novel pathways and mechanisms of Nicotine-induced oral carcinogenesis. Recent Patents on Anti-Cancer Drug Discovery, 17 (1). pp. 66-79. ISSN 1574-8928

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Abstract

Background: Smokeless Tobacco (SLT) contains 9 times more nicotine than Smoked Tobacco (SMT). The carcinogenic effect of nicotine is intensified by converting nicotine-to-nicotine- derived Nitrosamines (NDNs). Methods: A review of the literature was conducted with a tailored search strategy to unravel the novel pathways and mechanisms of nicotine-induced oral carcinogenesis. Results: Nicotine and NDNs act on nicotinic Acetylcholine Receptors (nAChRs) as agonists. Nicotine facilitates cravings through α4β2nAChR and α7nAChR, via enhanced brain dopamine release. Nicotine binding to nAChR promotes proliferation, migration, invasion, chemoresistance, radioresistance, and metastasis of oral cancer cells. Nicotine binding to α7nAChR on keratinocytes triggers Ras/Raf-1/MEK1/ERK cascade, promoting anti-apoptosis and pro-proliferative effects. Furthermore, the nicotine-enhanced metastasis is subdued on nAChR blockade through reduced nuclear localization of p-EGFR. Conclusion: Protracted exposure to nicotine/NDN augments cancer-stimulatory α7nAChR and desensitizes cancer inhibitory α4β2nAChR. Since nAChRs dictate both addictive and carcinogenic effects of nicotine, it seems counterintuitive to designate nicotine just as an addictive agent devoid of any carcinogenicity.

Item Type: Article
Uncontrolled Keywords: Oral cancer; carcinogen; nicotine; nitrosamines; smokeless; tobacco.
Subjects: Dentistry > MMMC Melaka
Depositing User: KMC Library
Date Deposited: 06 Jun 2022 13:37
Last Modified: 06 Jun 2022 13:37
URI: http://eprints.manipal.edu/id/eprint/158794

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