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A role for O-1602 and G protein-coupled receptor GPR55 in the control of colonic motility in mice.
Neuropharmacology. 2013 Aug; 71:255-63.N

Abstract

OBJECTIVE

The G protein-coupled receptor 55 (GPR55) is a novel cannabinoid (CB) receptor, whose role in the gastrointestinal (GI) tract remains unknown. Here we studied the significance of GPR55 in the regulation of GI motility.

DESIGN

GPR55 mRNA and protein expression were measured by RT-PCR and immunohistochemistry. The effects of the GPR55 agonist O-1602 and a selective antagonist cannabidiol (CBD) were studied in vitro and in vivo and compared to a non-selective cannabinoid receptor agonist WIN55,212-2. CB1/2(-/-) and GPR55(-/-) mice were employed to identify the receptors involved.

RESULTS

GPR55 was localized on myenteric neurons in mouse and human colon. O-1602 concentration-dependently reduced evoked contractions in muscle strips from the colon (∼60%) and weakly (∼25%) from the ileum. These effects were reversed by CBD, but not by CB1 or CB2 receptor antagonists. I.p. and i.c.v. injections of O-1602 slowed whole gut transit and colonic bead expulsion; these effects were absent in GPR55(-/-) mice. WIN55,212-2 slowed whole gut transit effects, which were counteracted in the presence of a CB1 antagonist AM251. WIN55,212-2, but not O-1602 delayed gastric emptying and small intestinal transit. Locomotion, as a marker for central sedation, was reduced following WIN55,212-2, but not O-1602 treatment.

CONCLUSION

GPR55 is strongly expressed on myenteric neurons of the colon and it is selectively involved in the regulation of colonic motility. Since activation of GPR55 receptors is not associated with central sedation, the GPR55 receptor may serve as a future target for the treatment of colonic motility disorders.

Authors+Show Affiliations

Snyder Institute for Chronic Diseases, Division of Gastroenterology, Department of Medicine, University of Calgary, Alberta, Canada.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23603203

Citation

Li, Kun, et al. "A Role for O-1602 and G Protein-coupled Receptor GPR55 in the Control of Colonic Motility in Mice." Neuropharmacology, vol. 71, 2013, pp. 255-63.
Li K, Fichna J, Schicho R, et al. A role for O-1602 and G protein-coupled receptor GPR55 in the control of colonic motility in mice. Neuropharmacology. 2013;71:255-63.
Li, K., Fichna, J., Schicho, R., Saur, D., Bashashati, M., Mackie, K., Li, Y., Zimmer, A., Göke, B., Sharkey, K. A., & Storr, M. (2013). A role for O-1602 and G protein-coupled receptor GPR55 in the control of colonic motility in mice. Neuropharmacology, 71, 255-63. https://doi.org/10.1016/j.neuropharm.2013.03.029
Li K, et al. A Role for O-1602 and G Protein-coupled Receptor GPR55 in the Control of Colonic Motility in Mice. Neuropharmacology. 2013;71:255-63. PubMed PMID: 23603203.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A role for O-1602 and G protein-coupled receptor GPR55 in the control of colonic motility in mice. AU - Li,Kun, AU - Fichna,Jakub, AU - Schicho,Rudolf, AU - Saur,Dieter, AU - Bashashati,Mohammad, AU - Mackie,Ken, AU - Li,Yongyu, AU - Zimmer,Andreas, AU - Göke,Burkhard, AU - Sharkey,Keith A, AU - Storr,Martin, Y1 - 2013/04/18/ PY - 2013/01/08/received PY - 2013/03/06/revised PY - 2013/03/12/accepted PY - 2013/4/23/entrez PY - 2013/4/23/pubmed PY - 2014/1/11/medline SP - 255 EP - 63 JF - Neuropharmacology JO - Neuropharmacology VL - 71 N2 - OBJECTIVE: The G protein-coupled receptor 55 (GPR55) is a novel cannabinoid (CB) receptor, whose role in the gastrointestinal (GI) tract remains unknown. Here we studied the significance of GPR55 in the regulation of GI motility. DESIGN: GPR55 mRNA and protein expression were measured by RT-PCR and immunohistochemistry. The effects of the GPR55 agonist O-1602 and a selective antagonist cannabidiol (CBD) were studied in vitro and in vivo and compared to a non-selective cannabinoid receptor agonist WIN55,212-2. CB1/2(-/-) and GPR55(-/-) mice were employed to identify the receptors involved. RESULTS: GPR55 was localized on myenteric neurons in mouse and human colon. O-1602 concentration-dependently reduced evoked contractions in muscle strips from the colon (∼60%) and weakly (∼25%) from the ileum. These effects were reversed by CBD, but not by CB1 or CB2 receptor antagonists. I.p. and i.c.v. injections of O-1602 slowed whole gut transit and colonic bead expulsion; these effects were absent in GPR55(-/-) mice. WIN55,212-2 slowed whole gut transit effects, which were counteracted in the presence of a CB1 antagonist AM251. WIN55,212-2, but not O-1602 delayed gastric emptying and small intestinal transit. Locomotion, as a marker for central sedation, was reduced following WIN55,212-2, but not O-1602 treatment. CONCLUSION: GPR55 is strongly expressed on myenteric neurons of the colon and it is selectively involved in the regulation of colonic motility. Since activation of GPR55 receptors is not associated with central sedation, the GPR55 receptor may serve as a future target for the treatment of colonic motility disorders. SN - 1873-7064 UR - https://www.unboundmedicine.com/medline/citation/23603203/A_role_for_O_1602_and_G_protein_coupled_receptor_GPR55_in_the_control_of_colonic_motility_in_mice_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0028-3908(13)00125-1 DB - PRIME DP - Unbound Medicine ER -