Cited by 18Pharmaceutical studies and practicesPharmacogenetics and Drug MetabolismComputational Drug Discovery Methods

On the Nature of Physiologically-Based Pharmacokinetic Models –A Priori or A Posteriori? Mechanistic or Empirical?

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Korzekwa, Ken, Nagar, Swati·2017·Pharmaceutical Research

Abstract

Physiologically-based pharmacokinetic (PBPK) models explicitly incorporate tissue-specific blood flows, partition coefficients, and metabolic processes. Since PBPK models are derived using physiologic parameters and interactions of the compound with tissue components, these models are considered to be "bottom up" as opposed to "top down". Modeling approaches can be characterized as either a posteriori (observational) or a priori (based solely on theory). Furthermore, approaches can be mechanistic (structure and components based on mechanisms) or empirical (based on observations alone). Both "bottom up" and "top down" approaches can incorporate either empirical or mechanistic components. In this perspective, we discuss some of the methods and assumptions of current PBPK modeling approaches. Specifically, we discuss drug partitioning into phospholipids and neutral lipids, use of blood-plasma ratios to estimate basic drug tissue partitioning, and clearance of neutral and acidic drugs. Based on these discussions, we believe that current PBPK models are mechanistic but a posteriori and semi-empirical.

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  1. [15]Davies JT A quantitative kinetic theory of emulsion type, I. Physical chemistry of the emulsifying agent. In Gas/Liquid and Liquid/Liquid Interface Proceedings of the International Congress of Surface Activity 1957 426 438

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Authors
Korzekwa, K., & Nagar, S.
Affiliations
Temple University (US)
Corresponding author
Korzekwa, Ken
Venue
Pharmaceutical Research
Published
2016-12-27
Volume
34
Issue
3
Pages
529-534
ISSN
  • 0724-8741 (ISSN-L)
  • 1573-904X
OpenAlex
W2562277823
Cited by
18
References
25
Citations by year
2024: 3 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 2 · 2019: 4 · 2018: 3 · 2017: 2
FWCI
3.49
Type
journal article
Language
en
Open access
Locations
  • Pharmaceutical Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of General Medical Sciences (1R01GM114369, 1R01GM104178)
Topics
  • Health Sciences › Medicine › Pediatrics, Perinatology and Child Health › Pharmaceutical studies and practices
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
  • Physical Sciences › Computer Science › Computational Theory and Mathematics › Computational Drug Discovery Methods
Keywords
physiologically based pharmacokinetic modeling, bottom-up modeling, top-down modeling, drug partitioning, tissue partitioning, drug clearance, acidic drugs, tissue blood flow, partition coefficient
MeSH terms
Chemistry, Pharmaceutical, Pharmaceutical Preparations, Humans, Models, Biological, Pharmacokinetics, Phospholipids, Tissue Distribution, Molecular Structure

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