Related Experiment Videos
Two-compartment basophil cell trafficking model for methylprednisolone pharmacodynamics
J A Wald1, D E Salazar, H Y Chen
1Department of Pharmaceutics, School of Pharmacy, State University of New York, Buffalo 14260.
Journal of Pharmacokinetics and Biopharmaceutics
|October 1, 1991
Summary
Methylprednisolone (MP) reduces circulating basophils by decreasing cell recirculation. A new model quantifies this corticosteroid effect, showing a mean IC50 of 8.1 ng/ml, applicable to other immune cell responses.
Area of Science:
- Pharmacology
- Immunology
- Mathematical Modeling
Background:
- Corticosteroids, like methylprednisolone (MP), are known to affect immune cell distribution.
- Basophils play a role in immune responses and their recirculation is influenced by various factors.
Purpose of the Study:
- To characterize the movement of basophils between blood and extravascular sites following methylprednisolone exposure.
- To develop and validate a quantitative model for corticosteroid-induced changes in basophil recirculation.
Main Methods:
- A two-compartment closed model was employed to analyze basophil movement.
- Methylprednisolone was administered to healthy males at varying doses (10, 25, 40 mg).
- Pharmacokinetic analysis of MP and assessment of whole blood histamine (as an index of basophils) were performed using HPLC and RIA, respectively. Nonlinear least-squares analysis was used to solve model parameters.
Main Results:
- The model successfully quantifies the dose-dependent decrease and subsequent return of circulating basophils.
- A mean IC50 value of 8.1 ng/ml was determined, indicating the sensitivity of basophils to methylprednisolone, comparable to receptor binding affinity.
- Simulations explored model extrapolations over a wide dose range.
Conclusions:
- The developed two-compartment model effectively describes corticosteroid-induced changes in basophil recirculation.
- This model provides a quantitative measure of the biologic response to corticosteroids and may be applicable to other immune cells and regulatory effects.