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Purification of L-[3H]nicotine eliminates low affinity binding
E Romm1, P M Lippiello, M J Marks
1Institute for Behavioral Genetics, University of Colorado, Boulder 80309.
Life Sciences
|January 1, 1990
Summary
Researchers investigated nicotine binding sites in the brain. The low-affinity site identified in some studies is likely an artifact from nicotine breakdown products, not a true binding site.
Area of Science:
- Neuroscience
- Pharmacology
Background:
- Studies have suggested two nicotine binding sites in rodent and human brain tissue based on Scatchard plot analysis.
- The nature and existence of these multiple binding sites, particularly a low-affinity site, remain under investigation.
Purpose of the Study:
- To clarify the nature of the low-affinity binding site observed in nicotine binding studies.
- To determine if the low-affinity site represents a genuine biological target or an experimental artifact.
Main Methods:
- Utilized L-[3H]nicotine binding assays with rodent and human brain tissue.
- Investigated the stereospecificity and inhibition by cholinergic agonists of the low-affinity binding site.
- Compared binding characteristics before and after purification of L-[3H]nicotine.
Main Results:
- The low-affinity binding site was found to be non-stereospecific.
- This site was not inhibited by low concentrations of cholinergic agonists.
- Purification of L-[3H]nicotine removed the low-affinity binding site.
Conclusions:
- The low-affinity binding site is likely an artifact resulting from nicotine degradation products.
- This finding suggests that only a single, high-affinity stereospecific nicotine binding site exists in the brain tissue studied.