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Related Concept Videos

Dose-Response Relationship: Overview01:03

Dose-Response Relationship: Overview

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Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
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Dose-Response Relationship: Potency and Efficacy01:22

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The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it...
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Dose Response Curve: Conventional Versus Nonmonotonic01:21

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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response...
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Pharmacokinetic–Pharmacodynamic Relationship: Intensity of Dose-Effect Relationship01:23

Pharmacokinetic–Pharmacodynamic Relationship: Intensity of Dose-Effect Relationship

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Pharmacodynamics explores the relationship between drug concentration and its effect. In a quantal response drug, the duration of action better correlates with drug concentration, while for graded effect drugs, the intensity of response is more relevant. This intensity depends on the dose, drug removal rate, and the region of the concentration–response curve.The concentration–response curve can be divided into three regions. Region 3 (80–100% maximum response) demonstrates...
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Pharmacokinetic–Pharmacodynamic Relationship: Dose to Pharmacological Effect01:28

Pharmacokinetic–Pharmacodynamic Relationship: Dose to Pharmacological Effect

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A drug’s dosage and pharmacokinetic properties determine how quickly it acts, how intense its effects are, and how long it lasts. Higher doses increase drug concentration at receptor sites, producing a hyperbolic curve when pharmacologic response is plotted against drug dose. Converting this scale to a log-linear format results in a sigmoidal curve, better representing dose–response relationships.For drugs following a one-compartment model, the pharmacologic response is directly...
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Quantitative Aspects of Drug-Receptor Interaction01:30

Quantitative Aspects of Drug-Receptor Interaction

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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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Potentiation of Anticancer Antibody Efficacy by Antineoplastic Drugs: Detection of Antibody-drug Synergism Using the Combination Index Equation
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Dose-Response Analysis When There Is a Correlation between Affinity and Efficacy.

Anthony Auerbach1

  • 1Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, New York auerbach@buffalo.edu.

Molecular Pharmacology
|December 15, 2015
PubMed
Summary
This summary is machine-generated.

Understanding receptor-ligand interactions is key. New methods allow calculation of concentration-response curves (CRCs) using two receptor constants, simplifying agonist characterization and aiding drug discovery.

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Area of Science:

  • Pharmacology
  • Biophysics
  • Computational Biology

Background:

  • Concentration-response curves (CRCs) typically describe agonist effects using parameters like efficacy, EC(50), and Hill coefficient.
  • Receptor activation involves ligand binding affinity differences between resting and active states.
  • Skeletal muscle nicotinic acetylcholine receptors exhibit an exponential relationship between binding affinities.

Purpose of the Study:

  • To present methods for estimating CRCs of partial agonists.
  • To demonstrate how two receptor-specific constants can predict entire CRCs.
  • To simplify the characterization of ligands and receptors.

Main Methods:

  • Utilizing two agonist-independent constants: the activation equilibrium constant (E(0)) and the affinity-correlation exponent (M).
  • Calculating entire CRCs from measurements of either efficacy or affinity.
  • Applying methods to receptors with a correlation between affinity and efficacy.

Main Results:

  • An exponential relationship between equilibrium dissociation constants for active and resting conformations was identified.
  • A method was developed to calculate CRCs using E(0) and M.
  • This approach allows for the prediction of CRCs for partial agonists.

Conclusions:

  • Two receptor constants (E(0) and M) are sufficient to define the CRC.
  • This simplifies the characterization of agonists and receptor activation.
  • The methods are applicable to partial agonists in systems with affinity-efficacy correlation.