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Localized alterations in pre- and postsynaptic serotonin binding sites in the ventrolateral prefrontal cortex of suicide victims

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Arango, Victoria, Underwood, Mark D., Gubbi, Ananda V., Mann, J. John·1995·Brain Research

Abstract

Altered serotonin indices have been reported in the brain of suicide victims. We sought to localize the changes in presynaptic and postsynaptic serotonin receptors and identify an area of prefrontal cortex that may influence suicide risk. Quantitative autoradiography was performed in coronal sections of prefrontal cortex to determine whether serotonin 5-HT1A receptor (postsynaptic in cortex) and serotonin transporter (presynaptic) binding are different in suicide victims compared to matched controls. 5-HT1A receptor binding was higher in 85 of the 103 sampled areas in the suicide group (n = 18 pairs; P < 0.0001). The increase ranged from 17 to 30%. The increase was more pronounced in the ventrolateral prefrontal cortex. Serotonin transporter binding was found to be lower in the suicide group in all but one of the 43 sampled regions (n = 22 pairs; P < 0.0001). The reduction in binding was most pronounced in the ventrolateral prefrontal cortex, where the difference between suicides and controls ranged between 15 and 27%. Serotonin transporter and 5-HT1A binding were negatively correlated (r = -0.35 to -0.44, P = 0.04 to 0.007) within the same brain areas, suggesting common regulatory factors with opposite effects on binding to the two receptors. We conclude that suicide victims have an abnormality in the serotonin system involving predominantly the ventrolateral prefrontal cortex, and hypothesize that the serotonergic dysfunction in this brain region contributes to the risk for suicidal behavior.

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Metadata

Authors
Arango, V., Underwood, M. D., Gubbi, A. V., & Mann, J. J.
Venue
Brain Research
Publisher
Elsevier BV
Published
1995-08
Volume
688
Issue
1-2
Pages
121-133
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2075327466
Cited by
459
References
0
FWCI
14.11
Type
journal article
Language
en
Open access
hybrid
Licence

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Arango, V., Underwood, M. D., Gubbi, A. V., & Mann, J. J. (1995). Localized alterations in pre- and postsynaptic serotonin binding sites in the ventrolateral prefrontal cortex of suicide victims. Brain Research. https://doi.org/10.1016/0006-8993(95)00523-s

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