Related Experiment Video
Updated: Jan 7, 2026
11:56
Nanomechanics of Drug-target Interactions and Antibacterial Resistance Detection
Published on: October 25, 2013
14.6K
The Hill-Langmuir Equation Governs Drug-Target Binding Kinetics for Pulsed Drug Delivery.
1Department of Mathematics, Shanghai University, Shanghai, China.
Fundamental & Clinical Pharmacology
|December 27, 2025
Summary
Pulsed drug delivery can be accurately modeled using a Hill-Langmuir equation, integrating pharmacokinetics and pharmacodynamics. This model helps optimize drug efficacy by understanding receptor occupancy dynamics.
Area of Science:
- Pharmacology
- Drug Delivery Systems
- Biophysics
Background:
- Receptor occupancy is a key metric for drug efficacy.
- Pulsed drug delivery aims to optimize dosing timing based on biological rhythms.
Purpose of the Study:
- Derive analytical expressions for steady-state receptor occupancy.
- Establish design principles for pulsed drug delivery systems.
Main Methods:
- Developed a simplified model integrating pharmacokinetic and binding kinetics.
- Utilized a Hill-Langmuir equation for analysis.
Main Results:
- The Hill-Langmuir equation accurately describes receptor occupancy under pulsed and multiple-dose regimens without assuming rapid equilibrium.
- Effective dissociation constant is influenced by elimination rate, dosing interval, and dissociation constant.
- Association and dissociation rate constants regulate receptor occupancy, aligning with binding affinity principles.
Conclusions:
- For pulsed delivery, the elimination rate constant must exceed dose frequency.
- Association rate drives rapid effects, while dissociation rate ensures sustained binding.
- Findings offer insights for drug discovery and optimizing pulsed drug delivery.
Related Concept Videos
00:57Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models
309
Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...
309
01:22Nonlinear Pharmacokinetics: Bioavailability and Protein-Drug Binding
557
When a drug follows nonlinear pharmacokinetics, its bioavailability, the amount of the drug that reaches the systemic circulation, can change with different doses. This is due to the presence of a saturable pathway. The pathway becomes saturated as the drug concentration increases, decreasing the absorption rate. Consequently, the drug's bioavailability may be lower than expected at higher doses.
To quantify the extent of bioavailability, pharmacologists often use a parameter called .
To quantify the extent of bioavailability, pharmacologists often use a parameter called .
557
01:13Physiological Pharmacokinetic Models: Assumption with Protein Binding
191
Physiological models with protein binding in pharmacokinetics offer a sophisticated approach to understanding drug disposition. These models consider drug-protein interactions, enabling them to effectively predict drug concentrations in different organs and tissues. This precision aids in accurate drug dosing, providing a significant advantage over conventional models. A key process within these models is equilibration, which ensures that drug concentrations achieve a steady state within the...
191
01:25Drug Distribution as One-Compartment Model and Elimination by Nonlinear Pharmacokinetics: Overview
304
Drug administration can occur through various routes, each of which may result in a different process of elimination. This process is often mixed with nonlinear and linear processes. It's important to understand that a single drug can be metabolized into different metabolites through parallel processes.
For instance, consider the metabolism of sodium salicylate. This compound is metabolized into two distinct substances: a glucuronide and a glycine conjugate. The rate of conjugation depends...
For instance, consider the metabolism of sodium salicylate. This compound is metabolized into two distinct substances: a glucuronide and a glycine conjugate. The rate of conjugation depends...
304
01:18Nonlinear Pharmacokinetics: Michaelis-Menten Equation
961
The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...
961
01:07Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance
241
Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
A recent model describes pravastatin's hepatobiliary excretion,...
A recent model describes pravastatin's hepatobiliary excretion,...
241