Relationship between dopaminergic neurotransmission, alcoholism, and Reward Deficiency syndrome.
paper
Cited
Public
Unavailable
- Authors
- Bowirrat, Abdalla; Oscar-Berman, Marlene
- Year
- 2005
- Journal
- American journal of medical genetics. Part B, Neuropsychiatric genetics : the official publication of the International Society of Psychiatric Genetics
- PMID
- 15457501
- DOI
- 10.1002/ajmg.b.30080
In this review, we described the neural substrates underlying Reward Deficiency syndrome which, in turn, is posited to underlie alcohol dependency. Alcoholism is a complex, multifactorial disorder that results from the interplay between genetic and environmental factors. The D(2) dopamine receptor (DRD(2)) has been associated with pleasure, and the DRD(2) A1 allele has been referred to as a reward gene. Evidence suggests that there is a tripartite interaction involving dopamine receptor deficiency, a propensity to abuse alcohol, and reduced sensitivity to rewards. This interaction relies heavily on genetic characteristics of the individual, with certain ethnic groups having a greater tendency toward alcoholism than others. The DRD(2) has been one of the most widely studied in neuropsychiatric disorders in general, and in alcoholism and other addictions in particular. The dopamine D2 (DRD2) gene, and especially its allele TaqI A1 allele and its receptor, also may be involved in comorbid antisocial personality disorder symptoms, high novelty seeking, and related traits. The mesocorticolimbic dopaminergic pathway system plays an especially important role in mediating reinforcement by abused drugs, and it may be a common denominator for addictions such as alcoholism. When the mesocorticolimbic dopamine reward system dysfunctions (perhaps caused by certain genetic variants), the end result is Reward Deficiency syndrome and subsequent drug-seeking behaviors. Reward Deficiency syndrome refers to the breakdown of the reward cascade, and resultant aberrant conduct, due to genetic and environmental influences. Alcohol and other drugs of abuse, as well as most positive reinforcers, cause activation and neuronal release of brain dopamine, which can decrease negative feelings and satisfy abnormal cravings. A deficiency or absence of DRD(2) receptors then predisposes individuals to a high risk for multiple addictive, impulsive, and compulsive behaviors. Although other neurotransmitters (e.g., glutamate, gamma-aminobutyric acid (GABA), and serotonin) may be important in determining the rewarding and stimulating effects of ethanol, dopamine may be critical for initiating drug use and for reinstating drug use during protracted abstinence. This article contains supplementary material, which may be viewed at the American Journal of Medical Genetics website at http://www.interscience.wiley.com/jpages/0148-7299:1/suppmat/index.html.
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| Are dopaminergic genes involved in a predisposition to pathological aggression? Hypothesizing the importance of "super normal controls" in psychiatricgenetic research of complex behavioral disorders. | Chen TJ et al. | โ | 2005 | โ |
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