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The Two-State Receptor Model

The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
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Related Experiment Video

Updated: May 24, 2026

Tracking Drug-induced Changes in Receptor Post-internalization Trafficking by Colocalizational Analysis
07:48

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Published on: July 3, 2015

Cannabinoid receptor trafficking in peripheral cells is dynamically regulated by a binary biochemical switch.

Jonas Kleyer1, Simon Nicolussi, Peter Taylor

  • 1Institute of Biochemistry and Molecular Medicine, Swiss National Centre of Competence in Research NCCR TransCure, University of Bern, Bühlstrasse 28, CH-3012 Bern, Switzerland.

Biochemical Pharmacology
|March 6, 2012
PubMed
Summary

Cannabinoid receptors (CB₁ and CB₂) exhibit ligand-independent trafficking between cytoplasm and cell membranes, not internalization upon agonist binding. This dynamic trafficking, influenced by biochemical switches, impacts cannabinoid research.

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Area of Science:

  • Cellular Biology
  • Neuroscience
  • Pharmacology

Background:

  • Cannabinoid receptors (CB₁ and CB₂), G protein-coupled receptors (GPCRs), are crucial in peripheral cell signaling.
  • Receptor localization in the cell membrane dictates G protein pathway activation.
  • Understanding CB receptor trafficking is key to cannabinoid pharmacology.

Purpose of the Study:

  • To investigate the trafficking mechanisms of CB₁ and CB₂ receptors in various cell types.
  • To explore the role of ligand-independent mechanisms in CB receptor localization.
  • To identify biochemical factors influencing CB receptor cell surface expression and internalization.

Main Methods:

  • Utilized cell lines (including HL60) and primary human immune cells (monocytes, T cells).
  • Investigated receptor localization and trafficking using techniques sensitive to cell surface expression and internalization.
  • Examined the effects of hydrogen peroxide and protein tyrosine phosphatase inhibitors (TPIs) on receptor dynamics.

Main Results:

  • CB receptors in cell lines and primary cells undergo ligand-independent trafficking, not agonist-induced internalization.
  • CB receptor expression and localization vary significantly across cell types, with oscillations in HL60 cells.
  • CB₂ receptors form oligomers and heterodimers with CB₁ receptors, exhibiting synchronized behavior.
  • Hydrogen peroxide and TPIs trigger CB receptor internalization or externalization based on cellular localization, acting as a regulatory switch.
  • This switch can inhibit phorbol ester-mediated CB receptor internalization.

Conclusions:

  • CB receptor trafficking is dynamic and regulated by ligand-independent mechanisms and biochemical switches.
  • Cell-type specific regulation of CB receptor cell surface expression is evident.
  • Findings offer new insights into cannabinoid signaling and receptor regulation, with implications for therapeutic development.