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The Use of Pharmacological-challenge fMRI in Pre-clinical Research: Application to the 5-HT System
Published on: April 25, 2012
[3H]MDL 100,907: a novel selective 5-HT2A receptor ligand
M P Johnson1, B W Siegel, A A Carr
1Hoechst Marion Roussel, Inc., Cincinnati, OH 45215, USA.
Naunyn-Schmiedeberg'S Archives of Pharmacology
|July 1, 1996
Summary
[3H]MDL 100,907 selectively binds to the serotonin 5-HT2A receptor with sub-nanomolar affinity. This radioligand offers a specific tool for 5-HT2A receptor research without needing additional blocking agents.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- MDL 100,907 demonstrates high selectivity for the serotonin 5-HT2A receptor in previous studies.
- Investigating the precise binding characteristics of radiolabeled MDL 100,907 is crucial for its application in receptor research.
Purpose of the Study:
- To characterize the receptor binding profile of [3H]MDL 100,907 in rat cortical homogenates.
- To determine the affinity and selectivity of [3H]MDL 100,907 for the 5-HT2A receptor.
Main Methods:
- Radioligand binding assays were performed using rat cortical homogenates.
- Saturation binding experiments determined affinity (KD) and receptor density (Bmax).
- Competition binding assays with various receptor ligands assessed selectivity.
Main Results:
- [3H]MDL 100,907 exhibited rapid equilibrium binding and identified a single binding site with a low KD (0.56 nM).
- Binding affinity was comparable to, and in some cases superior to, the standard radioligand [3H]ketanserin.
- Competition studies confirmed high selectivity for the 5-HT2A receptor over other neurotransmitter receptors.
Conclusions:
- [3H]MDL 100,907 is a highly selective radioligand for the 5-HT2A receptor with sub-nanomolar affinity.
- This radioligand can be effectively used for 5-HT2A receptor studies without requiring secondary blocking agents.
- The findings support the utility of [3H]MDL 100,907 in pharmacological research targeting the 5-HT2A receptor.
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