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Moving from Basic Toward Systems Pharmacodynamic Models

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ABSTRACT

Building upon many classical foundations of pharmacology, a diverse array of mechanistic pharmacokinetic-pharmacodynamic (PK/PD) models have emerged based on mechanisms of drug action and primary rate-limiting or turnover processes in physiology. An array of basic models can be extended to handle various complexities including tolerance and can readily be employed as building blocks in assembling enhanced PK/PD or small systems models. Our corticosteroid models demonstrate these concepts as well as elements of horizontal and vertical integration of molecular to whole-body processes. The potential advantages and challenges in moving PK/PD toward systems models are described.

Section snippets

INTRODUCTION

The areas of pharmacokinetics and pharmacodynamics (PK/PD) have evolved from a long history of appreciation of basic pharmacological principles mostly applied to static or in vitro systems. An array of simple PK/PD models for the time course of in vivo drug effects have evolved to the present era of use of extended or enhanced PK/PD models and small-to-large systems models to capture drug actions at various levels of biological organization. This overview will describe the various arenas that

ACKNOWLEDGMENTS

This work was supported by NIH grants GM 24211 and 57980. The author appreciates the many contributions of his esteemed colleagues, collaborators, fellows, students, and technicians for those aspects of this work that is cited herein as well as forming the basis for his PKPD modeling efforts over the course of his career. The assistance of Katherine Majewski from the National Library of Medicine is also appreciated. Our efforts were part of the activities of the UB Center of Excellence in

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