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Related Concept Videos

The Blood-brain Barrier00:49

The Blood-brain Barrier

Overview
Physiological Barriers01:25

Physiological Barriers

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.
The blood endothelial barrier is the most porous of these. It allows all small ionized, un-ionized, and lipophilic molecules to pass through the endothelial lining into the interstitial space...
Factors Affecting Drug Distribution: Physiological Barriers01:23

Factors Affecting Drug Distribution: Physiological Barriers

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.
The capillary endothelial barrier allows only smaller molecules below 600 Da (Daltons) to pass through. It also restricts drugs like heparin that are bound to blood components, limiting their movement within the bloodstream.
The...
Factors Affecting Drug Distribution: Organ Perfusion Rate01:15

Factors Affecting Drug Distribution: Organ Perfusion Rate

Drug distribution within the body is a complex process influenced by several factors, including perfusion rate, the rate at which the bloodstream transports drugs to tissue. This limitation becomes particularly significant when dealing with highly lipophilic drugs. In such cases, the rate at which the drug can move across membranes is crucial, and if the membrane is highly permeable to the drug, distribution becomes rate-limited by perfusion.
Perfusion rate-limited distribution relies on the...
Pharmacodynamics: Overview and Principles01:21

Pharmacodynamics: Overview and Principles

Pharmacodynamics is a scientific field that delves into drugs' intricate biochemical, cellular, and physiological effects on the human body. The study of pharmacodynamics helps us understand how drugs interact with the body and elicit various responses.
Most drugs' effects result from their interactions with drug receptors or targets within the body. These interactions trigger specific responses at the cellular or systemic level. Drug receptors can be found on the surfaces of cells or within...

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Related Experiment Video

Updated: May 28, 2026

An In Vivo Assessment of Blood-Brain Barrier Disruption in a Rat Model of Ischemic Stroke
12:19

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Do polyphenols enter the brain and does it matter? Some theoretical and practical considerations.

Sebastian Schaffer1, Barry Halliwell

  • 1Department of Biochemistry, Centre for Life Sciences, National University of Singapore, 22 Medical Drive, Singapore, 117456, Singapore.

Genes & Nutrition
|October 21, 2011
PubMed
Summary
This summary is machine-generated.

Polyphenols (PPs) may benefit brain health, but their brain uptake and action mechanisms remain unclear. This review examines PP brain penetration and explores new research avenues like hormesis and gut-brain interactions for better understanding.

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Area of Science:

  • Neuroscience
  • Nutritional Science
  • Pharmacology

Background:

  • Epidemiological and intervention studies suggest polyphenols (PPs) may enhance memory and cognition in humans and animals.
  • The precise mechanisms underlying these cognitive benefits of PPs are not well understood.
  • Limited reliable data exist on polyphenol brain uptake in animal models, hindering mechanism elucidation.

Purpose of the Study:

  • To review existing data on polyphenol penetration into the animal brain.
  • To explore proposed hypotheses for the biological basis of PPs' beneficial effects on the brain.
  • To highlight novel research approaches for understanding polyphenol neuroactivity.

Main Methods:

  • Systematic review of published literature on polyphenol brain uptake in animal studies.
  • Analysis of proposed biological mechanisms for polyphenol neuroprotection and cognitive enhancement.
  • Discussion of emerging research paradigms, including hormetic dose-response and gut microbiota-brain axis.

Main Results:

  • Data on polyphenol brain accumulation are scarce and often lack rigorous control measures.
  • Several hypotheses exist regarding PPs' neurobiological effects, including antioxidant and anti-inflammatory actions.
  • New approaches like hormesis and gut microbiota interactions offer promising avenues for future research.

Conclusions:

  • Understanding polyphenol brain penetration is crucial for deciphering their cognitive effects.
  • Hormetic effects and the gut microbiota-brain axis represent key areas for future investigation into polyphenol neurobiology.
  • Further research is needed to clarify polyphenol bioavailability and mechanisms of action in the brain.