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Related Concept Videos

Physiological Barriers01:25

Physiological Barriers

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Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
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Factors Affecting Drug Distribution: Physiological Barriers01:23

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Drug distribution in the body is intricately regulated by various physiological barriers that control the passage of substances. These include the capillary endothelial barrier, the blood-brain, blood-cerebrospinal fluid, blood-placental, and blood-testis barriers.
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The...
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Multicompartment Models: Overview01:14

Multicompartment Models: Overview

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Multicompartment models are mathematical constructs that depict how drugs are distributed and eliminated within the body. They segment the body into several compartments, symbolizing various physiological or anatomical areas connected through drug transfer processes such as absorption, metabolism, distribution, and elimination.
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Compartment Models: Two-Compartment Model01:20

Compartment Models: Two-Compartment Model

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The two-compartment model divides the body into central and peripheral compartments to account for varying blood perfusion rates among organs and tissues, affecting drug distribution. The central compartment includes blood and highly perfused tissues with rapid drug distribution, while the peripheral compartment contains tissues with slower drug distribution. After a single IV bolus dose, the drug concentration is high in plasma and low in tissues. The drug distribution between compartments...
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Two-Compartment Open Model: Overview01:05

Two-Compartment Open Model: Overview

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Multicompartmental models are crucial tools in pharmacokinetics, providing a framework to understand how drugs move within the body. The two-compartment model is a crucial subtype, segmenting the body into central and peripheral compartments. The central compartment represents areas with high blood flow, such as plasma and highly perfused organs like the kidneys and liver, while the peripheral compartment signifies tissues with lower blood flow, like adipose tissue and muscle tissue.
The...
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Effect of Hepatic Disease on Pharmacokinetics: Active Drug, Metabolite and Fraction of Metabolized Drug01:14

Effect of Hepatic Disease on Pharmacokinetics: Active Drug, Metabolite and Fraction of Metabolized Drug

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In pharmacotherapy, monitoring drug concentrations is paramount, especially for drugs whose therapeutic effects hinge on both the active compound and its metabolite. Hepatic impairment profoundly influences drug potency by altering liver function. If the drug is more potent than its metabolite, impaired liver function amplifies drug activity due to elevated drug concentration levels. Conversely, if the metabolite holds greater potency, diminished liver function diminishes drug activity by...
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Multicompartment Drug Monitoring Reveals Paired Brain-Liver Kinetics and Selective Central Nervous System Barrier

Yuchan Yuan1, Karen Scida2, Gregory V Carr1,2

  • 1Department of Physiology, Pharmacology & Therapeutics, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, United States.

ACS Sensors
|April 22, 2026
PubMed
Summary

Real-time monitoring reveals varied drug distribution in rat brains, challenging uniform central nervous system (CNS) uptake assumptions. This method offers precise pharmacokinetic insights for improved drug discovery.

Keywords:
ADMEaptamersbiosensorsdose scalingdrug monitoringelectrochemistryin vivo biosensingpharmacokinetics

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Biotechnology

Background:

  • Accurate characterization of drug distribution to target organs, particularly the central nervous system (CNS), is crucial for effective drug discovery.
  • Current methods using tissue homogenates lack the spatial and temporal resolution needed for detailed pharmacokinetic analysis.
  • Understanding drug penetration across the blood-brain barrier (BBB) and blood-cerebrospinal fluid barrier (BCSFB) is essential for CNS-targeted therapies.

Purpose of the Study:

  • To develop and apply a real-time monitoring technique for assessing drug concentrations in specific brain regions, blood, and liver.
  • To investigate the pharmacokinetic profiles of vancomycin and tobramycin in rats using this novel approach.
  • To challenge existing assumptions about uniform CNS drug distribution and liver uptake.

Main Methods:

  • Utilized real-time electrochemical aptamer-based (E-AB) monitoring for in vivo drug quantification.
  • Administered vancomycin and tobramycin intravenously to rats.
  • Measured drug concentrations in distinct brain regions (cortex, hippocampus, thalamus), blood, and liver.

Main Results:

  • Demonstrated significant regional differences in brain pharmacokinetics for vancomycin.
  • Observed vancomycin crossing the blood-brain barrier (BBB) but with limited transport across the blood-cerebrospinal fluid barrier (BCSFB).
  • Found that tobramycin failed to cross either the BBB or BCSFB, and vancomycin exhibited delayed and limited liver distribution.

Conclusions:

  • Spatially and temporally resolved pharmacokinetic assessments are necessary, as drug distribution within the CNS and to organs like the liver is not uniform.
  • The E-AB monitoring technique provides high-resolution, in vivo profiling of drug absorption, distribution, and clearance.
  • This approach can significantly inform dosing strategies and enhance the translational success of drug candidates.