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Psychiatry Res. 2013 May 30;212(2):125-31. doi: 10.1016/j.pscychresns.2012.09.007. Epub 2012 Nov 5.

Trait aggression and trait impulsivity are not related to frontal cortex 5-HT2A receptor binding in healthy individuals.

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1
Neurobiology Research Unit, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark. sophie.da.cunha@nru.dk

Abstract

Numerous studies indicate that the serotonergic (5-HT) transmitter system is involved in the regulation of impulsive aggression and there is from post-mortem, in vivo imaging and genetic studies evidence that the 5-HT2A receptor may be involved. We investigated 94 healthy individuals (60 men, mean age 47.0±18.7, range 23-86) to determine if trait aggression and trait impulsivity were related to frontal cortex 5-HT2A receptor binding (5-HT2AR) as measured with [18F]-altanserin PET imaging. Trait aggression and trait impulsivity were assessed with the Buss-Perry Aggression Questionnaire (AQ) and the Barratt Impulsiveness Scale 11 (BIS-11). Statistical analyses were conducted using a multiple linear regression model and internal consistency reliability of the AQ and BIS-11 was evaluated by Cronbach's alpha. Contrary to our hypothesis, results revealed no significant associations between 5-HT2AR and the AQ or BIS-11 total scores. Also, there was no significant interaction between gender and frontal cortex 5-HT2AR in predicting trait aggression and trait impulsivity. This is the first study to examine how 5-HT2AR relates to trait aggression and trait impulsivity in a large sample of healthy individuals. Our findings are not supportive of a selective role for 5-HT2AR in mediating the 5-HT related effects on aggression and impulsivity in psychiatrically healthy individuals.

[Indexed for MEDLINE]

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