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Microtiter plate binding assay for cholinergic compounds utilizing the nicotinic acetylcholine receptor
L Chen1, G B Martin, G A Rechnitz
1Department of Chemistry, University of Hawaii, Honolulu 96822.
Analytical Chemistry
|December 1, 1992
Summary
A novel binding assay for nicotinic acetylcholine receptors enables large-scale drug development screening. This simplified method uses solid-phase extraction and microtiter plates for efficient cholinergic compound determination.
Area of Science:
- Neuroscience
- Biochemistry
- Pharmacology
Background:
- Cholinergic compounds modulate nicotinic acetylcholine receptors (nAChRs).
- Accurate determination of these compounds is crucial for drug development.
- Existing assays can be complex and time-consuming.
Purpose of the Study:
- To develop a receptor-based binding assay for determining cholinergic compounds targeting nAChRs.
- To adapt the assay for high-throughput screening in drug discovery.
- To simplify the assay protocol for increased efficiency.
Main Methods:
- Developed a 96-well microtiter plate assay.
- Utilized immobilization of biotin-BSA and avidin-biotin interaction.
- Employed sequential binding of ligands and biotin alpha-bungarotoxin conjugate to vesicle-bound nAChRs.
- Incorporated solid-phase extraction of enzyme labels.
- Determined bound enzyme activity to quantify alpha Bgt-biotin.
Main Results:
- The assay is suitable for large-scale screening.
- Solid-phase extraction simplifies the protocol.
- Dose-response curves and Scatchard plots were generated.
- Apparent binding constants were evaluated.
- Kinetic studies facilitated optimization.
Conclusions:
- A simplified, efficient receptor-based binding assay for nAChRs has been developed.
- The assay is amenable to large-scale drug development screening.
- The method allows for rapid determination of cholinergic compounds with minimal sample handling.