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Genetic variants in the serotonin transporter influence the efficacy of bupropion and nortriptyline in smoking cessation.
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- Author(s): Quaak, Marieke (AUTHOR); van Schayck, Constant P. (AUTHOR); Postma, Dirkje S. (AUTHOR); Wagena, Edwin J. (AUTHOR); van Schooten, Frederik J. (AUTHOR)
- Source:
Addiction. Jan2012, Vol. 107 Issue 1, p178-187. 10p. 5 Charts, 2 Graphs. - Source:
- Additional Information
- Subject Terms: ANTIDEPRESSANTS; DOPAMINE uptake inhibitors; NORTRIPTYLINE (Drug); AGAR; ANALYSIS of variance; CHI-squared test; CONFIDENCE intervals; ELECTROPHORESIS; GENES; GENETIC polymorphisms; HEALTH outcome assessment; POLYMERASE chain reaction; RESEARCH funding; SEROTONIN; SMOKING cessation; LOGISTIC regression analysis; SECONDARY analysis; RANDOMIZED controlled trials; TREATMENT effectiveness; DATA analysis software; THERAPEUTICS
- Subject Terms:
- Abstract: ABSTRACT Aims We investigated whether variants in the serotonin transporter gene ( SLC6A4) influence smoking cessation rates using antidepressant therapy (i.e. bupropion and nortriptyline). Design Pharmacogenetic (secondary) analysis of a randomized, placebo-controlled efficacy trial of bupropion and nortriptyline for smoking cessation. Setting Single-centre study, Maastricht University, the Netherlands. Participants A total of 214 of 255 (84%) current daily smokers participating in a randomized controlled efficacy trial. Measurements Subjects were genotyped for three functional variants in SLC6A4 (5-HTTLPR, STin2, rs25531). Primary outcome measures were prolonged abstinence from weeks 4-12, 4-26 and 4-52. Secondary outcome measures included 7-day point prevalence abstinence at weeks 4, 12, 26 and 52. Findings Carriers of the 5-HTTLPR high-activity L-variant had higher prolonged cessation rates with bupropion than placebo [odds ratio (OR) = 1.44, 95% confidence interval (CI) = 1.01-2.05, P = 0.04]. Combining the three variants resulted in increased prolonged cessation rates for both bupropion and nortriptyline among carriers of four to five high-activity variants (bupropion: OR = 2.00, 95% CI = 1.21-3.29, P = 0.01; nortriptyline: OR = 1.91, 95% CI = 1.02-3.56, P = 0.04). Similar results were found for point prevalence abstinence. Conclusions Bupropion and nortriptyline seem to be more effective in smoking cessation among SLC6A4 high-activity variant carriers, probably by blocking the increased serotonin transporter activity, thereby increasing serotonin levels. Prospective studies have to assess if this can improve cessation rates when treatment is targeted at individuals based on their genotypes. [ABSTRACT FROM AUTHOR]
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