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Related Concept Videos

Pharmacokinetic Models: Comparison and Selection Criterion01:26

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Physiological and compartmental models are valuable tools used in studying biological systems. These models rely on differential equations to maintain mass balance within the system, ensuring an accurate representation of the dynamic processes at play.
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Compartmental analysis is a widely adopted approach to characterizing drug pharmacokinetics. It uses compartment models that conceptualize the body as a collection of reversibly communicating compartments, each representing a group of tissues exhibiting similar drug distribution characteristics. The movement rate of the drug between these compartments is typically described by first-order kinetics.
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The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower...
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Physiological models in pharmacokinetics are instrumental in understanding the distribution and elimination of drugs within the body. These models describe the drug concentration within target organs, influenced by factors such as drug uptake, tissue volume, and blood flow. Drug uptake is governed by the partition coefficient, which signifies the drug concentration ratio in tissue to that in the blood. The blood flow rate to a specific tissue is expressed as Qt, and the rate of change in tissue...
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Related Experiment Video

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Diagonal Method to Measure Synergy Among Any Number of Drugs
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A foundation for reference models for drug combinations with an application to Loewe's reference model.

Wim De Mulder1, Martin Kuiper2

  • 1Department of Biology, NTNU, Realfagbygget, Trondheim, Norway. wim.demulder@kuleuven.be.

BMC Bioinformatics
|October 16, 2020
PubMed
Summary

This study provides a fundamental basis for Loewe

Keywords:
Complementary doseDrug combinationsEquivalent doseLoeweReference model

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Area of Science:

  • Pharmacology
  • Mathematical Biology
  • Drug Combinations

Background:

  • Synergistic drug combinations are widely used in clinical practice.
  • Defining drug non-interaction is crucial for predicting combination effects.
  • Loewe's reference model is a long-standing, intuitive model for drug non-interaction.

Purpose of the Study:

  • To derive Loewe's reference model from more fundamental principles.
  • To introduce novel concepts of complementary and equivalent doses.
  • To propose a general non-interaction principle for drug combinations.

Main Methods:

  • Introduction of the concept of complementary dose.
  • Reformulation of equivalent dose for broader applicability.
  • Development of a general non-interaction principle based on dose interplay.

Main Results:

  • Loewe's reference model can be derived from fundamental principles.
  • A new, general non-interaction principle is established.
  • This principle links complementary and equivalent doses.

Conclusions:

  • The study enhances understanding of Loewe's reference model.
  • A general non-interaction principle is presented, independent of specific dose-response curves.
  • This work offers a more robust theoretical framework for analyzing drug interactions.