Variation in the α 5 nicotinic acetylcholine receptor subunit gene predicts cigarette smoking intensity as a function of nicotine content.
Pharmacogenomics J
; 14(1): 70-6, 2014 Feb.
Article
en En
| MEDLINE
| ID: mdl-23358500
ABSTRACT
A single-nucleotide polymorphism (SNP) in the α5 nicotinic acetylcholine receptor subunit gene, rs16969968, has been repeatedly associated with both smoking and respiratory health phenotypes. However, there remains considerable debate as to whether associations with lung cancer are mediated through effects on smoking behavior. Preclinical studies suggest that α5 receptor subunit expression and function may have a direct role in nicotine titration during self administration. The present study investigated the association of CHRNA5 polymorphisms and smoking topography in 66 smokers asked to smoke four nicotine-containing (nicotine yield=0.60 mg) and four placebo (nicotine yield <0.05 mg) cigarettes, during separate experimental sessions. Genotype at rs16969968 predicted nicotine titration, with homozygotes for the major allele (GG) displaying significantly reduced puff volume in response to nicotine, whereas minor allele carriers (AG or AA) produced equivalent puff volumes for placebo and nicotine cigarettes. The present results suggest that puff volume may be a more powerful objective phenotype of smoking behavior than self-reported cigarettes per day and nicotine dependence. Further, these results suggest that the association between rs16969968 and lung cancer may be mediated by the quantity of smoke inhaled.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Tabaquismo
/
Fumar
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Receptores Nicotínicos
/
Polimorfismo de Nucleótido Simple
/
Nicotina
Tipo de estudio:
Clinical_trials
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Adolescent
/
Adult
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Aged
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Female
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Humans
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Male
/
Middle aged
Idioma:
En
Revista:
Pharmacogenomics J
Asunto de la revista:
BIOLOGIA MOLECULAR
/
FARMACOLOGIA
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos