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Abstract Title:

Peripheral anti-nociceptive and anti-inflammatory effect of oleanolic acid in a rat model of osteoarthritis.

Abstract Source:

Antiinflamm Antiallergy Agents Med Chem. 2020 Nov 11. Epub 2020 Nov 11. PMID: 33183210

Abstract Author(s):

Israa Salman, Marc Fakhoury, Malak Fouani, Nada Lawand

Article Affiliation:

Israa Salman

Abstract:

BACKGROUND: Oleanolic acid (OA) is a naturally occurring pentacyclic triterpenoid with multifarious actions. Chief among them is the anti-inflammatory effect it exerts when taken orally; however, the underpinning mechanisms of such effects have not yet been fully explored.

METHODS: In the present study, we evaluated the anti-inflammatory and anti-nociceptive effect of OA by injecting it directly into the knee joint using an animal model of osteoarthritis. Behavioral and electrophysiological studies were conducted to determine whether OA exerts a direct modulatory effect on primary sensory afferents that could lead to a decrease in pain-related behaviors and inflammatory responses. Rats were divided into two main groups: a pre- and a post-treatment group. Knee joint inflammation was induced by injecting a mixture of 3% kaolin and carrageenan (K/C). In the pre-treatment groups, two different doses of OA [5 mg/ml (n=5) and 30 mg/ml (n=4); 0.1 ml per injection] were administered into the synovial cavity of the knee joint before induction of inflammation. In the post-treatment group, rats received only one dose [5 mg/ml (n=5)] of OA after induction of inflammation.

RESULTS: Results indicate that intra-articular injection of OA improves motor coordination and attenuates nociceptive behav-ior and inflammatory reactions. More importantly, we observed a direct depolarizing action of OA on articular sensory fi-bers, a crucial mechanism that activates descending inhibitory pathways and controls incoming nociceptive signals to the spinal cord.

CONCLUSION: Overall, our findings suggest that OA can be used as preventive and therapeutic approach for the management of osteoarthritis.

Study Type : Animal Study

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