Pharmacological and Regional Characterization of [3H]LY278584 Binding Sites in Human Brain

Anissa Abi‐Dargham, Marc Laruelle, David T. Wong, David W. Robertson, Daniel Weinberger, Joel Kleinman

Research output: Contribution to journalReview article

Abstract

Abstract: Binding of [3H]LY278584, which has been previously shown to label 5‐hydroxytryptamine3 (5‐HT3) receptors in rat cortex, was studied in human brain. Saturation experiments revealed a homogeneous population of saturable binding sites in amygdala (KD= 3.08 ± 0.67 nM, Bmax= 11.86 ± 1.87 fmol/mg of protein) as well as in hippocampus, caudate, and putamen. Specific binding was also high in nucleus accumbens and entorhinal cortex. Specific binding was negligible in neocortical areas. Kinetic studies conducted in human hippocampus revealed a Kon of 0.025 ± 0.009 nM−1 min−1 and a Koff of 0.010 ± 0.002 min−1. The kinetics of [3H]LY278584 binding were similar in the caudate. Pharmacological characterization of [3H]LY278584 specific binding in caudate and amygdala indicated the compound was binding to 5‐HT3 receptors. We conclude that 5‐HT3 receptors labeled by [3H]LY278584 are present in both limbic and striatal areas in human brain, suggesting that 5‐HT3 receptor antagonists may be able to influence the dopamine system in humans, similarly to their effects in rodent studies.

Original languageEnglish (US)
Pages (from-to)730-737
Number of pages8
JournalJournal of Neurochemistry
Volume60
Issue number2
DOIs
Publication statusPublished - 1993
Externally publishedYes

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Keywords

  • 5‐Hydroxytryptamine receptors
  • Limbic system
  • Striatum
  • [H]LY278584

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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