The Open Biochemistry Journal

ISSN: 1874-091X ― Volume 14, 2020

Molecules Acting on CB1 Receptor and their Effects on Morphine Withdrawal In Vitro

Anna Capasso*, Chiara Gallo
Department of Pharmaceutical Sciences, University of Salerno, Via Ponte Don Melillo (84084) Fisciano, Salerno, Italy


Several pharmacological studies indicate that CB1 cannabinoid receptors (CB1Rs) are present in guinea pig ileum (GPI) and their activation reduce the acetylcholine (Ach) release. Dependence can be induced and measured in vitro by using GPI and the contraction due to opioid withdrawal is caused by acetylcholine release.

Design of molecules acting on the CB1Rs are widely studied and the large availaibility of CB1Rs agonists and antagonists provides powerful tools to determine the role of these receptors in mediating some of physiological and pharmacological effects in the myenteric neurones.

Given the relationship between CB1Rs/Opioid Withdrawal/Ach system, in the present paper we have designed six new CB1Rs agonists named A-F and evaluated their role in mediating morphine withdrawal in GPI. Also, a comparative study was performed by using the CB1Rs synthetic cannabinoid WIN 55,212-2 and CP 55,940. The results of our experiments indicate that both WIN 55,212-2 and CP 55,940 (1x10-8-5x10-8-1x10-7 M) were able to reduce morphine withdrawal in a concentration-dependent manner. Very similar results were obtained with the new CB1Rs agonists (A-F) used at same concentrations. The results of our experiments indicate that CB1Rs are involved in the control of morphine withdrawal in vitro thus confirming an important functional interaction between the cannabinoid and opioid system.

Keywords: Ach. CB1 receptors, morphine, withdrawal, guinea-pig ileum.

Article Information

Identifiers and Pagination:

Year: 2009
Volume: 3
First Page: 78
Last Page: 84
Publisher Id: TOBIOCJ-3-78
DOI: 10.2174/1874091X00903010078

Article History:

Received Date: 20/9/2009
Revision Received Date: 23/10/2009
Acceptance Date: 30/10/2009
Electronic publication date: 11/12/2009
Collection year: 2009

© Capasso and Gallo; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Dipartimento di Scienze Farmaceutiche, Università di Salerno, Via Ponte Don Melillo, (84084) Fisciano, Salerno, Italia; Tel/Fax: 0039-089-969744; E-mail:

Track Your Manuscript:


"We have always had a fruitful cooperation and long-term experience of publishing with Bentham Open."

"A number of our original papers have appeared in its different journals, as the Bentham Open Publishers provides sufficient research in the field of science and technologies (belonging to the pharmaceutical, biotechnology, biomedical industries etc). The staff of the Bentham Open always treat our papers very seriously and gently during the rutile paper reviewing process, so far we always felt their kindness and highly cooperative support. Today, Bentham Open is providing a great support to science and research, giving opportunities of high standard publishing as well as promoting and enhancing selected papers around the world through communication and exchange of global scientific education."

Kholmirzo T. Kholmurodov
Leading Scientist
FLNP (Frank Laboratory of Neutron Physics) JINR (Joint Institute of Nuclear Research) Moscow region, Russia

Browse Contents

Webmaster Contact:
Copyright © 2020 Bentham Open