Reported childhood abuse is associated with low serotonin transporter binding in vivo in major depressive disorder.
BACKGROUND
Physical or psychological adversity in childhood is associated with a higher risk for depression in adulthood, and with persistent serotonergic abnormalities in humans and in animal models. We hypothesized that reported childhood abuse would be associated with lower brain serotonin transporter (5-HTT) binding potential (BP(P), proportional to the number of available transporters) in adults. We examined healthy volunteers and subjects with major depressive disorder, a sample enriched for childhood abuse.


METHODS
Regional brain 5-HTT BP(P) was measured using positron emission tomography (PET) with [(11)C]McN 5652 and a metabolite-corrected arterial input function in 43 healthy volunteers and 23 subjects in a major depressive episode, ten of whom reported a history of sexual and/or physical abuse before age 15, and 13 of whom did not. As only two healthy volunteers reported childhood abuse, primary analyses were restricted to the depressed sample, with healthy controls presented as comparators.


RESULTS
Depressed subjects reporting childhood abuse had lower 5-HTT BP(P) than nonabused depressed subjects across all brain regions examined (P = 0.017). The groups did not differ in relevant demographic or clinical variables. Genotype frequencies of a functional polymorphism in the 5-HTT gene promoter (5-HTTLPR) did not differ between the groups.


CONCLUSIONS
Reported childhood abuse is associated with lower 5-HTT BP(P) in this sample of subjects with major depression, consistent with other reports that childhood adversity can lower serotonergic function permanently. Lower 5-HTT BP(P) may represent a biological pathway through which early life stress predisposes to the development of subsequent psychiatric illness, including major depressive disorder.
Miller
Jeffrey M
JM
Department of Molecular Imaging and Neuropathology, New York State Psychiatric Institute, New York, New York, USA. jm2233@columbia.edu
Kinnally
Erin L
EL
Ogden
R Todd
RT
Oquendo
Maria A
MA
Mann
J John
JJ
Parsey
Ramin V
RV
D000328:Adult; D054523:Adult Survivors of Child Abuse; D001921:Brain / Q000000981:diagnostic imaging / Q000378:metabolism*; D002250:Carbon Radioisotopes; D003865:Major Depressive Disorder / Q000000981:diagnostic imaging / Q000378:metabolism*; D005260:Female; D005787:Gene Frequency; D006801:Humans; D007546:Isoquinolines; D008297:Male; D009483:Neuropsychological Tests; D010865:Pilot Projects; D011110:Polymorphism, Genetic; D049268:Positron-Emission Tomography; D011401:Promoter Regions, Genetic; D017422:Sequence Analysis, DNA; D050486:Serotonin Plasma Membrane Transport Proteins / Q000235:genetics / Q000378:metabolism*
D002250:Carbon Radioisotopes; D007546:Isoquinolines; C493230:SLC6A4 protein, human; D050486:Serotonin Plasma Membrane Transport Proteins; C058079:McN 5652