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Acute tryptophan depletion and self-injurious behavior in aggressive patients and healthy volunteers

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Abstract

Rationale

An association between serotonin (5-HT) activity and self-injurious (i.e., self-aggressive) behavior across the spectrum of lethality (from self-mutilation through completed suicide) is a well-replicated finding. Studies to date, however, have relied on nonexperimental designs to examine this relationship, limiting the causal inferences that can be drawn about the role of 5-HT in self-aggressive behavior.

Objective

Examine the effect of experimentally altered 5-HT activity (via dietary tryptophan depletion) on self-aggressive behavior among adults with and without intermittent explosive disorder (IED). Individuals with a marked history of aggression, such as those with IED, are characterized by compromised 5-HT and heightened risk for self-aggression, making this a population of interest for examining the proposed relations.

Materials and methods

IED patients (n = 16) and healthy controls (n = 16) received a tryptophan depletion and a placebo drink on separate days at least 1 week apart. Self-aggressive behavior was assessed on both study days using a well-validated laboratory-based behavioral assessment with self-aggression defined as the intensity of shock self-administered.

Results

Tryptophan depletion facilitated selection of more intense shocks, on average, in both groups. Patients with IED were also more self-aggressive overall than healthy volunteers. No IED by drink condition interactions were found.

Conclusion

Experimentally lowered 5-HT bioavailability enhances overall self-injurious behavior irrespective of aggression history.

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Notes

  1. Complete VAS data was available from 26 (15 control and 11 IED) of the 28 subjects who completed the SAP. The two remaining subjects failed to complete the VAS for at least one time point.

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Acknowledgements

The authors thank Bing Chen, Damien McCormick, and Adam Strohm for their technical contributions. This study was supported in part by the Guggenheim Foundation (Dr. Royce Lee) and NIH K23MH073721 (Michael McCloskey, Ph.D.).

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Correspondence to Michael S. McCloskey.

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McCloskey, M.S., Ben-Zeev, D., Lee, R. et al. Acute tryptophan depletion and self-injurious behavior in aggressive patients and healthy volunteers. Psychopharmacology 203, 53–61 (2009). https://doi.org/10.1007/s00213-008-1374-6

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  • DOI: https://doi.org/10.1007/s00213-008-1374-6

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