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Thioxanthene-derived analogs as sigma(1) receptor ligands
Richard A Glennon1, Abd M Ismaiel, Seth Ablordeppey
1Department of Medicinal Chemistry, School of Pharmacy, Virginia Commonwealth University, PO Box 980540, Richmond, VA 23298-0540, USA. glennon@hsc.vcu.edu
Bioorganic & Medicinal Chemistry Letters
|April 15, 2004
Summary
Thioxanthene analogs can bind to sigma(1) receptors without an intact thioxanthene ring. Structural modifications can improve binding affinity to subnanomolar levels and enhance selectivity for sigma(1) over sigma(2) receptors.
Area of Science:
- Medicinal Chemistry
- Neuropharmacology
- Molecular Biology
Background:
- Sigma receptors, including sigma(1) and sigma(2) subtypes, are implicated in various neurological processes.
- Thioxanthene derivatives have shown potential as ligands for sigma receptors, but their structural requirements for binding are not fully understood.
Purpose of the Study:
- To investigate the structure-affinity relationships of thioxanthene-related compounds at sigma(1) receptors.
- To explore the potential for enhancing binding affinity and selectivity through structural modifications.
Main Methods:
- Synthesis of novel thioxanthene analogs.
- Radioligand binding assays to determine affinity (Ki) and selectivity for sigma(1) and sigma(2) receptors.
Main Results:
- An intact thioxanthene ring is not essential for binding to sigma(1) receptors.
- Specific structural modifications led to analogs with subnanomolar affinity for sigma(1) receptors.
- Several analogs exhibited significant selectivity for sigma(1) over sigma(2) receptors.
Conclusions:
- Thioxanthene-related structures can be optimized for high-affinity and selective binding to sigma(1) receptors.
- These findings provide a basis for designing novel therapeutic agents targeting sigma(1) receptors.