Title:Nicotine Abuse and Neurodegeneration: Novel Pharmacogenetic Targets
to Aid Quitting and Reduce the Risk of Dementia
Volume: 23
Issue: 1
Author(s): Fatimah Almahasneh, Romany H. Gerges, Ejlal Abu-El-Rub*Ramada R. Khasawneh
Affiliation:
- Department of Basic Medical Sciences, Faculty of Medicine, Yarmouk University, Irbid, Jordan
Keywords:
Nicotine abuse, neurodegeneration, dementia, pharmacogenetics, dopamine, prevention.
Abstract: Nicotine dependence has deleterious neurological impacts. Previous studies found an association
between cigarette smoking and accelerating age-related thinning of the brain's cortex and subsequent
cognitive decline. Smoking is considered the third most common risk factor for dementia,
which prompted the inclusion of smoking cessation in dementia prevention strategies. Traditional
pharmacologic options for smoking cessation include nicotine transdermal patches, bupropion and
varenicline. However, based on smokers’ genetic makeup, pharmacogenetics can be used to develop
novel therapies to replace these traditional approaches. Genetic variability of cytochrome P450 2A6
has a major impact on smokers’ behavior and their response to quitting therapies. Gene polymorphism
in nicotinic acetylcholine receptor subunits also has a great influence on the ability to quit smoking. In
addition, polymorphism of certain nicotinic acetylcholine receptors was found to affect the risk of dementia
and the impact of tobacco smoking on the development of Alzheimer's disease. Nicotine dependence
involves the activation of pleasure response through the stimulation of dopamine release.
Central dopamine receptors, catechol-o-methyltransferase and the dopamine transporter protein, regulate
synaptic dopamine levels. The genes of these molecules are potential targets for novel smoking
cessation drugs. Pharmacogenetic studies of smoking cessation also investigated other molecules, such
as ANKK1 and dopamine-beta-hydroxylase (DBH). In this perspective article, we aim to highlight the
promising role of pharmacogenetics in the development of effective drugs for smoking cessation,
which can increase the success rate of smoking quitting plans and ultimately reduce the incidence of
neurodegeneration and dementia.