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Friday, August 2, 2013
Gene combinations help predict treatment success for alcoholism medication
NIH-funded study says five-marker genotype panel can guide ondansetron use.
An experimental treatment for alcohol dependence works better in individuals who possess specific combinations of genes that regulate the function and binding of serotonin, a brain chemical affected by the treatment, according to a study supported by the National Institutes of Health. A report of the finding appears online in the American Journal of Psychiatry.
“This study is another important step toward personalized treatments for alcohol dependence,” says Kenneth R. Warren, Ph.D., acting director of the National Institute on Alcohol Abuse and Alcoholism (NIAAA), which funded the study. “A personalized approach based on a person’s genetic makeup is increasingly being investigated for delivering optimum treatment to the ‘right’ patient.”
Ondansetron is a medication currently used to treat nausea and vomiting, often following chemotherapy. It works by blocking serotonin-3 receptors, and has shown potential as a treatment for defined subpopulations with alcohol dependence.
In previous studies, Professor Bankole Johnson, D.Sc., M.D., and his team at the University of Virginia, Charlottesville, have shown that variations in genes that encode the serotonin transporter, a protein that regulates the concentration of serotonin between nerve cells, can significantly influence drinking intensity. They have also shown that the effectiveness of ondansetron therapy among people with alcohol dependence is influenced by variations of the serotonin transporter gene.
In the current study, Professor Johnson and his colleagues extended their prior work by analyzing variants of serotonin receptor genes, collectively designated as HTR3, among nearly 300 alcohol-dependent individuals who were participating in a clinical trial of ondansetron. They found that three HTR3 variants were significantly associated with the effectiveness of ondansetron treatment for alcohol dependence.
“Taken together, these studies implicate a collective effect of serotonin receptor and transporter gene combinations, defined by a five-marker genotype panel, on the response to treatment with ondansetron for a genetically defined subpopulation of individuals with alcohol dependence,” says Professor Johnson. “Multi-site, larger studies are about to begin to progress this work.”
The National Institute on Alcohol Abuse and Alcoholism, part of the National Institutes of Health, is the primary U.S. agency for conducting and supporting research on the causes, consequences, prevention, and treatment of alcohol abuse, alcoholism, and alcohol problems. NIAAA also disseminates research findings to general, professional, and academic audiences. Additional alcohol research information and publications are available at http://www.niaaa.nih.gov.
About the National Institutes of Health (NIH): NIH, the nation's medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.
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Determination of genotype combinations that can predict the outcome of the treatment of alcohol dependence using the 5-HT3 antagonist ondansetron. Johnson, BA, et al. American Journal of Psychiatry. 2013 July 30. [Epub ahead of print]