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Imidazole binding to human serum albumin
M C Rodrigo1, A Ceballos, E Mariño
1Physical Chemistry Department, Faculty of Pharmacy, University of Salamanca, Spain.
International Journal of Clinical Pharmacology, Therapy, and Toxicology
|June 1, 1988
Summary
Imidazole salicylate administration releases imidazole. This study found imidazole binds to human serum albumin with low percentages (12-20%) at physiological temperatures, unaffected by sodium salicylate.
Area of Science:
- Pharmacology
- Biochemistry
- Drug Metabolism
Background:
- Imidazole is released in vivo upon administration of imidazole salicylate.
- Understanding imidazole's interaction with plasma proteins is crucial for pharmacokinetic profiling.
Purpose of the Study:
- To investigate the in vitro binding of imidazole to human serum albumin (HSA).
- To determine the binding characteristics and constants of imidazole-HSA interaction.
- To assess the influence of sodium salicylate on imidazole binding to HSA.
Main Methods:
- In vitro ultrafiltration assay was used to measure imidazole binding to HSA.
- Binding percentages were determined at physiological temperatures (25°C and 37°C).
- A three-site binding model was applied to analyze the data.
Main Results:
- Imidazole exhibited low binding percentages to HSA: 12.1 ± 1.8% at 37°C and 19.7 ± 3.1% at 25°C.
- The binding data fit a model with three equal and independent binding sites on HSA.
- Sodium salicylate (100 µg/ml) did not significantly alter imidazole binding to HSA.
Conclusions:
- Imidazole has limited binding to human serum albumin at therapeutic concentrations.
- The binding is temperature-dependent and follows a specific multi-site model.
- Co-administered sodium salicylate does not interfere with imidazole's plasma protein binding.