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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Tetrahydrocannabinol (THC) is a phytocannabinoid that primarily interacts with the CB1 receptor, a type of G protein-coupled receptor (GPCR) predominantly in and around the chemoreceptor trigger zone (CTZ) and emetic center. THC also blocks the serotonin receptor activity in the dorsal vagal complex (DVC) by inhibiting serotonin release. THC exerts its anti-emetic effects through these interactions, which are beneficial for patients undergoing chemotherapy.
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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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G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Cannabinoid receptor CB1 and CB2 interacting proteins: Techniques, progress and perspectives.

Caitlin R M Oyagawa1, Natasha L Grimsey1

  • 1Department of Pharmacology and Clinical Pharmacology, School of Medical Sciences, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand; Centre for Brain Research, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, Auckland, New Zealand.

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Summary

Understanding cannabinoid receptors 1 and 2 (CB1 and CB2) protein interactions is key for developing new therapies. Research into the cannabinoid receptor interactome offers novel therapeutic intervention strategies.

Keywords:
CB1CB2CannabinoidDimerHeteromerInteractionMultimerizationReceptorSignalingTrafficking

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Biochemistry

Background:

  • Cannabinoid receptors 1 and 2 (CB1 and CB2) are crucial in physiological processes.
  • These receptors are potential therapeutic targets for various diseases.
  • Protein-protein interactions influence G protein-coupled receptor (GPCR) function and signaling.

Purpose of the Study:

  • To review the current literature on the cannabinoid receptor interactome.
  • To discuss methodologies for studying GPCR protein-protein interactions.
  • To explore future perspectives in cannabinoid receptor research.

Main Methods:

  • Review of existing scientific literature.
  • Analysis of techniques like FRET, BRET, PLA, and BiFC for studying protein interactions.
  • Consideration of controls and physiological context in experimental design.

Main Results:

  • A growing number of proteins interacting with CB1 and CB2 have been identified.
  • Various techniques are employed to investigate these interactions.
  • The importance of appropriate controls and physiological context is highlighted.

Conclusions:

  • Characterizing the cannabinoid receptor interactome enhances understanding of GPCR biology.
  • Investigating these interactions may lead to novel therapeutic interventions.
  • Further research into CB1 and CB2 interacting proteins is warranted.