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Tea catechins' affinity for human cannabinoid receptors.

G Korte1, A Dreiseitel, P Schreier

  • 1Department of Psychiatry, University of Regensburg, Franz-Josef-Strauss-Allee 11, H4 R97 93053 Regensburg, Germany. gabriele.korte@klinik.uni-regensburg.de

Phytomedicine : International Journal of Phytotherapy and Phytopharmacology
|November 10, 2009
PubMed
Summary
This summary is machine-generated.

Certain tea catechins, like EGCG, show moderate affinity for type 1 cannabinoid receptors (CB1), suggesting a potential mechanism for their health benefits. Peripheral receptor signaling is unlikely to be significant.

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Area of Science:

  • Pharmacology
  • Natural Products Chemistry
  • Neuroscience

Background:

  • Tea catechins possess known health benefits, including anti-inflammatory and neuroprotective effects.
  • Their role in regulating food intake is also documented.
  • The potential cannabimimetic activity of tea catechins is explored as a cellular mechanism.

Purpose of the Study:

  • To investigate the cannabimimetic bioactivity of tea catechin derivatives.
  • To determine the binding affinity of specific tea catechins to cannabinoid receptors (CB1 and CB2).

Main Methods:

  • Competitive radioligand binding assays were employed.
  • Recombinant human cannabinoid receptors (CB1 and CB2) expressed in cell lines (Chem-1 and CHO) were used.
  • Affinity was quantified using inhibition constants (Ki).

Main Results:

  • (-)-epigallocatechin-3-O-gallate (EGCG), (-)-epigallocatechin (EGC), and (-)-epicatechin-3-O-gallate (ECG) demonstrated moderate affinity for CB1 receptors (Ki values ranging from 33.6 to 47.3 microM).
  • Binding to CB2 receptors was weaker for EGC and ECG (inhibition constants > 50 microM).
  • (+)-catechin and (-)-epicatechin showed negligible affinity for both CB1 and CB2 receptors.

Conclusions:

  • Selected tea catechins can potentially target central nervous cannabinoid receptors (CB1).
  • Signaling via peripheral cannabinoid receptors (CB2) is less likely to be a major in vivo mechanism for these compounds.
  • The findings suggest a possible cellular effector role for the cannabimimetic activity of tea catechins in their known health benefits.