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Since the brain endocannabinoid system (ECS) has been implicated in ASPD and aggressive behavior, we utilized [<jats:sup>11<\/jats:sup>C]CURB positron emission tomography to investigate fatty acid amide hydrolase (FAAH), an enzyme of the ECS that degrades anandamide, in 16 individuals with ASPD and 16 control participants. We hypothesized that FAAH density would be lower in the amygdala for several reasons. First, decreased FAAH expression is associated with increased cannabinoid receptor 1 stimulation, which may be responsible for amygdala hyper-reactivity in reactive aggression. Second, the amygdala is the seat of the neural circuit mediating reactive aggression. Third, other PET studies of externalizing populations show reduced brain FAAH density. Conversely, we hypothesized that FAAH expression would be greater in the orbitofrontal cortex. Consistent with our hypothesis, we found that amygdala FAAH density was lower in the amygdala of ASPD (<jats:italic>p<\/jats:italic>\u2009=\u20090.013). Cerebellar and striatal FAAH expression were inversely related with impulsivity (cerebellum: <jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.60, <jats:italic>p<\/jats:italic>\u2009=\u20090.017; dorsal caudate: <jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.58, <jats:italic>p<\/jats:italic>\u2009=\u20090.023; dorsal putamen: <jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.55, <jats:italic>p<\/jats:italic>\u2009=\u20090.034), while cerebellar FAAH density was also negatively associated with assaultive aggression (<jats:italic>r<\/jats:italic>\u2009=\u2009\u22120.54, <jats:italic>p<\/jats:italic>\u2009=\u20090.035). ASPD presents high levels of disruptive behavior with few, if any, efficacious treatment options. Novel therapeutics that increase FAAH brain levels in a region-specific manner could hold promise for attenuating certain symptom clusters of ASPD, although our results require replication.<\/jats:p>","DOI":"10.1038\/s41398-020-01144-2","type":"journal-article","created":{"date-parts":[[2021,1,18]],"date-time":"2021-01-18T15:08:40Z","timestamp":1610982520000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Lower amygdala fatty acid amide hydrolase in violent offenders with antisocial personality disorder: an [11C]CURB positron emission tomography study"],"prefix":"10.1038","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7578-723X","authenticated-orcid":false,"given":"Nathan J.","family":"Kolla","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Isabelle","family":"Boileau","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karolina","family":"Karas","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeremy J.","family":"Watts","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pablo","family":"Rusjan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sylvain","family":"Houle","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Romina","family":"Mizrahi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,1,18]]},"reference":[{"key":"1144_CR1","doi-asserted-by":"publisher","first-page":"259","DOI":"10.1146\/annurev-clinpsy-050817-084819","volume":"14","author":"A Raine","year":"2018","unstructured":"Raine, A. 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