PROTECTIVE EFFECT OF CELASTRUS PANICULATUS SEEDS EXTRACT AGAINST LIPOPOLYSACCHARIDE-INDUCED PAW EDEMA IN RATS

Abstract

The present study was designed to evaluate the effect of Celastrus paniculatus seeds methanolic extract (CPME) against lipopolysaccharide (LPS)-induced paw edema and nociception in rats.  Moreover, in-vitro test for soluble epoxide hydrolase (sEH) inhibition activity of CPME was conducted to study its possible mode of action. 

Celastrus paniculatus seeds were extracted with methanol by cold maceration for 7 days. The obtained dark brown coloured extract was evaluated for preliminary phytochemical screening and subjected for HPTLC analysis. Then the extract was evaluated for its action against LPS-induced paw edema in rats at the dose of 100, 200 and 400 mg/kg body weight by measuring the paw edema, nociceptive bioassays and estimating 5-HETE in serum. In addition, CPME was evaluated for in-vitro sEH inhibition activity.

Administration of CPME attenuates LPS-induced paw edema by 22.85% and serum 5-HETE levels by 9.56% (P<0.001) and elevated pain threshold by 112.19% (P<0.001). The CPME inhibits human, mouse and rat sEH activity with IC₅₀ of 4.60 µg/mL, 4.17 µg/mL and 5.18 µg/mL, respectively. The present study results indicate that CPME has protective effect against LPS-induced inflammation and pain in rats. The possible mode of action is attenuation of 5-HETE levels and sEH inhibition. However, further research is warranted to elucidate and isolate the active constituents from Celastrus paniculatus seeds.