A risk variant for alcoholism in the NMDA receptor affects amygdala activity during fear conditioning in humans

作者：Cacciaglia Raffaele; Nees Frauke; Pohlack Sebastian T; Ruttorf Michaela; Winkelmann Tobias; Witt Stephanie H; Nieratschker Vanessa; Rietschel Marcella; Flor Herta^*

来源：Biological Psychology, 2013, 94(1): 74-81.

DOI：10.1016/j.biopsycho.2013.05.006

• Single nucleotide polymorphism
• NMDA receptor
• Alcoholism
• Fear conditioning
• Amygdala

People at high risk for alcoholism show deficits in aversive learning, as indicated by impaired electrodermal responses during fear conditioning, a basic form of associative learning that depends on the amygdala. A positive family history of alcohol dependence has also been related to decreased amygdala responses during emotional processing. In the present study we report reduced amygdala activity during the acquisition of conditioned fear in healthy carriers of a risk variant for alcoholism (rs2072450) in the NR2A subunit-containing N-methyl-d-aspartate (NMDA)-receptor. These results indicate that rs2072450 might confer risk for alcohol dependence through deficient fear acquisition indexed by a diminished amygdala response during aversive learning, and provide a neural basis for a weak behavioral inhibition previously documented in individuals at high risk for alcohol dependence. Carriers of the risk variant additionally exhibit dampened insula activation, a finding that further strengthens our data, given the importance of this brain region in fear conditioning.

• 出版日期2013-9
• 单位上海市精神卫生中心