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Related Concept Videos

Clearance Models: Noncompartmental Models01:17

Clearance Models: Noncompartmental Models

206
Clearance is a pharmacokinetic parameter traditionally defined by compartment models, signifying the rate at which a drug is expelled from the body. However, a noncompartmental model offers an alternative method for assessing clearance, primarily employing empirical data obtained after administering a single drug dose.
The noncompartmental approach capitalizes on extensive sampling data, correlating the volume of distribution to systemic exposure and the administered dosage. This method enables...
206
Clearance Models: Compartment Models01:25

Clearance Models: Compartment Models

261
Clearance measures drug elimination from the central compartment, including plasma and highly perfused organs like kidneys and liver. Its calculation varies depending on pharmacokinetic models and administration routes. The one-compartment model, for instance, portrays the pharmacokinetics of polar drugs such as aminoglycoside antibiotics administered intravenously and readily excreted in urine. In this case, clearance is influenced by the terminal rate constant (λz) and the total volume...
261
Clearance Models: Physiological Models01:09

Clearance Models: Physiological Models

242
Drug clearance is a critical pharmacokinetic process involving the irreversible removal of drugs from the body through various organs over a specified time period. Physiological models are indispensable in determining organ-specific clearance, defined by the proportion of the drug eliminated per unit of time from the organ's blood volume.
The organ's clearance rate depends on the blood flow to the organ and the extraction ratio (E). The extraction ratio describes the organ's...
242
Hepatic Drug Clearance: Role of Transporters01:14

Hepatic Drug Clearance: Role of Transporters

250
In the liver and bile canaliculi, influx and efflux transporters modification can influence intrinsic clearance. Transporters play a significant role in moving drugs within liver cells. Elaborate models, such as the Biopharmaceutical Classification System (BCS), are essential to relate transporters to drug disposition. This system categorizes drugs into four classes based on solubility and permeability, providing insights into elimination routes and the effects of transporters following oral...
250
One-Compartment Open Model for IV Bolus Administration: Estimation of Clearance00:56

One-Compartment Open Model for IV Bolus Administration: Estimation of Clearance

298
Clearance is a key pharmacokinetic parameter that quantifies the volume of body fluid from which a drug is entirely removed within a specific time frame. It is crucial in assessing how a drug is eliminated from the body and has critical clinical applications.
In the one-compartment open model for intravenous (IV) bolus administration, clearance is estimated by dividing the elimination rate by the plasma drug concentration. This equation leverages the elimination rate constant and the apparent...
298
Hepatic Drug Clearance: Restrictive and Nonrestrictive Clearance01:09

Hepatic Drug Clearance: Restrictive and Nonrestrictive Clearance

421
Hepatic clearance refers to the volume of blood cleared of a drug by the liver per unit of time. It plays a crucial role in drug metabolism and elimination. While hepatic clearance is commonly estimated by subtracting renal clearance from total body clearance, other pathways, such as pulmonary or biliary clearance, may also contribute. However, these pathways are generally less significant than hepatic and renal clearance.
Most drugs undergo restrictive clearance, which is proportional to the...
421

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Related Experiment Video

Updated: Dec 27, 2025

Novel Passive Clearing Methods for the Rapid Production of Optical Transparency in Whole CNS Tissue
06:14

Novel Passive Clearing Methods for the Rapid Production of Optical Transparency in Whole CNS Tissue

Published on: May 8, 2018

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Tau Clearance Mechanisms.

Maoping Tang1, Jarreau Harrison1, Carol A Deaton1

  • 1University of Rochester, Rochester, NY, USA.

Advances in Experimental Medicine and Biology
|February 26, 2020
PubMed
Summary
This summary is machine-generated.

Proper protein degradation is vital for neuronal health. This chapter explores how the proteasome and autophagy-lysosome pathways clear tau protein, crucial for preventing neurodegenerative diseases like Alzheimer's.

Keywords:
AutophagyAutophagy receptorsBAG3Endolysosomal pathwayProteasomeUbiquitylation

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Related Experiment Videos

Last Updated: Dec 27, 2025

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Neurons require efficient protein quality control to maintain function.
  • Tau protein is critical for neuronal processes, and its dysregulation is implicated in neurodegenerative diseases.
  • Impaired clearance of misfolded or toxic proteins, including tau, contributes to neuronal dysfunction.

Purpose of the Study:

  • To review the primary mechanisms of tau protein clearance: the proteasome and autophagy-lysosome pathways.
  • To discuss the known contributions of these degradative pathways to tau clearance.
  • To explore recent findings on tau degradation via the endolysosomal system and its role in neurodegeneration.

Main Methods:

  • Literature review of proteasomal and autophagic mechanisms for protein degradation.
  • Analysis of current research on tau protein clearance pathways.
  • Examination of the endolysosomal system's role in tau degradation.

Main Results:

  • The proteasome and autophagy-lysosome pathways are key routes for tau degradation.
  • Deficits in these clearance systems can lead to the accumulation of toxic tau species.
  • The endolysosomal system also plays a role in clearing tau protein.

Conclusions:

  • Efficient tau clearance is essential for neuronal health and preventing neurodegenerative conditions.
  • Dysfunctional proteasomal, autophagic, or endolysosomal pathways contribute to tauopathies.
  • Understanding these clearance mechanisms is critical for developing therapeutic strategies for Alzheimer's disease and related disorders.