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Structure-activity studies on inhibition of choline uptake by a mouse brain synaptosomal preparation: basic data
1Department of Neurobiochemistry, Beckman Research Institute of the City of Hope, Duarte, CA 91010.
Brain Research
|November 15, 1988
Summary
Researchers investigated over 80 substances inhibiting high-affinity choline uptake in mouse brain synaptosomes. A model of the choline transporter suggests two anionic sites and a hydrophobic domain, guiding the development of novel inhibitors.
Area of Science:
- Neuroscience
- Pharmacology
- Biochemistry
Background:
- High-affinity choline uptake is crucial for acetylcholine synthesis in the brain.
- Understanding the molecular mechanisms of choline transport is vital for developing neurological drugs.
Purpose of the Study:
- To identify substances that inhibit high-affinity choline uptake.
- To elucidate the structural characteristics of the choline transporter.
Main Methods:
- Screening of over 80 compounds for inhibition of [3H]choline uptake in mouse brain synaptosomes.
- Kinetic analysis to determine the competitive nature of inhibition.
Main Results:
- A provisional model of the choline transporter was proposed, featuring two hydrophilic anionic sites and a cationic hydrophobic domain.
- Inhibitors with quaternary ammonium groups and lipophilic moieties effectively blocked choline uptake.
- Bisquaternary compounds and certain monoquaternary compounds showed potent inhibitory effects.
Conclusions:
- The choline transporter possesses specific structural features, including anionic and hydrophobic regions, that can be targeted for inhibition.
- Further characterization of transporter sites may lead to more potent reversible inhibitors of choline uptake.
- This research provides insights into the structure-activity relationships of choline uptake inhibitors.