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Anandamide, an endogenous cannabinoid, has a very low physical dependence potential
M D Aceto1, S M Scates, R K Razdan
1Department of Pharmacology and Toxicology, Medical College of Virginia, Virginia Commonwealth University, Richmond, Virginia, USA.
The Journal of Pharmacology and Experimental Therapeutics
|November 10, 1998
Summary
An endogenous cannabinoid agonist, anandamide, was investigated for its potential to cause physical dependence. Results indicate anandamide has minimal capacity for physical dependence, unlike cannabinoid antagonists.
Area of Science:
- Neuroscience
- Pharmacology
- Cannabinoid Research
Background:
- Previous studies demonstrated physical dependence on Delta9-tetrahydrocannabinol (THC).
- This prompted investigation into whether anandamide, an endogenous cannabinoid agonist, also induces physical dependence.
Purpose of the Study:
- To determine if anandamide administration leads to physical dependence in rats.
- To evaluate the effects of anandamide precursors and analogs on physical dependence.
Main Methods:
- Rats received continuous intraperitoneal infusions of anandamide (low or high dose) or its precursor/analogs over four days.
- Behavioral changes, including immobility and ptosis, were observed.
- Effects of abrupt discontinuation and challenges with a cannabinoid antagonist (SR 141716A) were assessed.
Main Results:
- High-dose anandamide infusion caused immobility and ptosis in rats.
- Abrupt discontinuation of anandamide did not result in rebound activity.
- Anandamide precursor (arachidonic acid) and a stable analog (2-Me-F-AN) showed no significant effects.
- SR 141716A alone activated behaviors, suggesting it has intrinsic activity.
Conclusions:
- Anandamide exhibits little to no capacity for inducing physical dependence.
- The cannabinoid antagonist SR 141716A demonstrated behavioral activation, supporting a depressant role for the endogenous cannabinoid system in the CNS.