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Distribution and characterization of [3H]mesulergine binding in human brain postmortem
D Marazziti1, A Rossi, G Giannaccini
1Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotechnologie, University of Pisa, Italy. dmarazzi@psico.med.unipi.it
Summary
This study maps serotonin 5-HT2C receptor distribution in the human brain using [3H]mesulergine binding. Findings reveal widespread receptor presence, particularly in the choroid plexus, offering anatomical insights into 5-HT2C receptor functions.
Area of Science:
- Neuroscience
- Pharmacology
- Neuroanatomy
Background:
- Serotonin 5-HT2C receptors are implicated in various brain functions, including feeding, anxiety, and neuronal excitability.
- Limited data exists on the precise distribution of these receptors within the human brain.
Purpose of the Study:
- To investigate and characterize the binding of [3H]mesulergine, a 5-HT2C antagonist, in human autopsy brain samples.
- To map the distribution of 5-HT2C receptors in the human brain.
Main Methods:
- Radioligand binding assays using [3H]mesulergine on autopsy brain tissue from 24 subjects.
- Saturation binding experiments to determine binding characteristics and receptor density.
- Pharmacological profiling using various displacing compounds to confirm receptor specificity.
Main Results:
- [3H]mesulergine binding predominantly represented 5-HT2C receptors, with saturation studies indicating a single binding site.
- Highest binding density was observed in the choroid plexus, followed by the hippocampus, substantia nigra, basal ganglia, amygdala, hypothalamus, and prefrontal cortex.
- Pharmacological data confirmed the binding specificity for 5-HT2C receptors, with ritanserin, mesulergine, and mianserine showing high affinity.
Conclusions:
- This study demonstrates a broad distribution of 5-HT2C receptors across the human brain.
- The identified anatomical distribution provides a basis for understanding the diverse roles of 5-HT2C receptors in human physiology and behavior.