Evidence for chronically altered serotonin function in the cerebral cortex of female 3,4-methylenedioxymethamphetamine polydrug users

Christina R. Di Iorio, Tristan J. Watkins, Mary S. Dietrich, Aize Cao, Jennifer U. Blackford, Baxter Rogers, Mohammed S. Ansari, Ronald M. Baldwin, Rui Li, Robert M. Kessler, Ronald M. Salomon, Margaret Benningfield, Ronald L. Cowan

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Context: MDMA (3,4-methylenedioxymethamphetamine, also popularly known as "ecstasy") is a popular recreational drug that produces loss of serotonin axons in animal models. Whether MDMA produces chronic reductions in serotonin signaling in humans remains controversial. Objective: To determine whether MDMA use is associated with chronic reductions in serotonin signaling in the cerebral cortex of women as reflected by increased serotonin 2A receptor levels. Design: Cross-sectional case-control study comparing serotonin 2A receptor levels in abstinent female MDMA polydrug users with those in women who did not use MDMA (within-group design assessing the association of lifetime MDMA use and serotonin 2A receptors). Case participants were abstinent from MDMA use for at least 90 days as verified by analysis of hair samples. The serotonin 2A receptor levels in the cerebral cortex were determined using serotonin 2A-specific positron emission tomography with radioligand fluorine 18-labeled setoperone as the tracer. Setting: Academic medical center research laboratory. Participants: A total of 14 female MDMA users and 10 women who did not use MDMA (controls). The main exclusion criteria were nondrug-related DSM-IV Axis I psychiatric disorders and general medical illness. Main Outcome Measures: Cortical serotonin 2A receptor nondisplaceable binding potential (serotonin 2ABP ND). Results: MDMA users had increased serotonin 2ABP ND in occipital-parietal (19.7%), temporal (20.5%), occipitotemporal- parietal (18.3%), frontal (16.6%), and frontoparietal (18.5%) regions (corrected P < .05). Lifetime MDMA use was positively associated with serotonin 2ABP NDin frontoparietal (β = 0.665; P = .007), occipitotemporal (β = 0.798; P = .002), frontolimbic (β = 0.634; P = .02), and frontal (β = 0.691; P = .008) regions. In contrast, there were no regions in which MDMA use was inversely associated with receptor levels. There were no statistically significant effects of the duration of MDMA abstinence on serotonin 2ABP ND. Conclusions: The recreational use of MDMA is associated with long-lasting increases in serotonin 2A receptor density. Serotonin 2A receptor levels correlate positively with lifetime MDMA use and do not decrease with abstinence. These results suggest that MDMA use produces chronic serotonin neurotoxicity in humans. Given the broad role of serotonin in human brain function, the possibility for therapeutic MDMA use, and the widespread recreational popularity of this drug, these results have critical public health implications.

Original languageEnglish (US)
Pages (from-to)399-409
Number of pages11
JournalArchives of general psychiatry
Volume69
Issue number4
DOIs
StatePublished - Apr 2012
Externally publishedYes

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Psychiatry and Mental health

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