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The Resident-intruder Paradigm: A Standardized Test for Aggression, Violence and Social Stress
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Brain monoamine oxidase A activity predicts trait aggression.

Nelly Alia-Klein1, Rita Z Goldstein, Aarti Kriplani

  • 1Medical Department, Brookhaven National Laboratory, Upton, New York 11973, USA. nellyklein@bnl.gov

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|May 9, 2008
PubMed
Summary

Lower brain monoamine oxidase A (MAO A) activity in males is linked to higher self-reported aggression, regardless of MAOA genotype. This suggests MAO A enzyme levels, not just the gene, are key neurochemical substrates for aggression.

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Area of Science:

  • Neuroscience
  • Genetics
  • Psychology

Background:

  • Monoamine oxidase A (MAO A) enzyme breaks down key neurotransmitters.
  • Genetic variations in MAOA have been linked to aggressive behavior, particularly with environmental stressors.
  • Previous research focused on MAOA genotype rather than the enzyme's activity in the brain.

Purpose of the Study:

  • To investigate the association between brain MAO A enzyme activity and trait aggression in healthy adult males.
  • To determine if MAO A enzyme levels, rather than MAOA genotype alone, regulate brain amine concentrations related to aggression.
  • To explore the neurochemical basis of aggression.

Main Methods:

  • Positron emission tomography (PET) was used to measure in vivo brain MAO A activity in healthy men using a specific radioligand.
  • Trait aggression was assessed using the Multidimensional Personality Questionnaire (MPQ).
  • MAOA genotype was considered, but the focus was on enzyme activity.

Main Results:

  • Brain MAO A activity showed an inverse correlation with trait aggression.
  • Lower MAO A activity in both cortical and subcortical brain regions was associated with higher self-reported aggression.
  • This relationship explained over one-third of the variability in aggression and was observed across MAOA genotype groups.

Conclusions:

  • Brain MAO A enzyme activity is a significant neurochemical substrate for trait aggression in healthy adult males.
  • The findings highlight the importance of MAO A enzyme levels in regulating aggression, independent of MAOA genotype.
  • This research provides a neurochemical basis for understanding aberrant aggression and its potential link to antisocial behavior.