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Serum effects confound the neuroleptic radioreceptor assay
Life Sciences
|March 12, 1984
Summary
Serum non-specific binding significantly impacts neuroleptic radioreceptor assays (NRRA). This variability in neuroleptic-like activity (NLA) monitoring may explain discrepancies with other analytical methods.
Area of Science:
- Pharmacology
- Neuroscience
- Analytical Chemistry
Background:
- The neuroleptic radioreceptor assay (NRRA) is a common method for measuring neuroleptic-like activity (NLA) in patients on antipsychotic medication.
- Previous studies suggested serum effects on NRRA binding were negligible.
Purpose of the Study:
- To investigate the impact of serum from healthy volunteers on NRRA binding.
- To determine if serum variability affects the quantitative accuracy of NRRA.
Main Methods:
- Utilized striata from rat and cow brains for radioreceptor binding assays.
- Assessed the effect of serum (50 microL/1 mL assay volume) on radioligand binding.
- Analyzed log-logit plots to evaluate binding characteristics in the presence of serum.
Main Results:
- Sera from drug-free volunteers caused marked inhibition of radioligand binding.
- Serum effects varied significantly between different membrane preparations and individuals.
- Despite variability, the slopes of log-logit plots remained consistent (equal to 1).
Conclusions:
- Non-specific serum effects introduce significant variability into NRRA.
- Accurate compensation for serum effects using standard curves is challenging.
- This variability may limit the quantitative utility of NRRA in neuroleptic drug monitoring and explain assay inconsistencies.