Abstract
OBJECTIVES: To evaluate the antipsoriatic activity of Givotia rottleriformis bark in rats. MATERIALS AND METHODS: The antipsoriatic activity of the ethanol extract was investigated using ultraviolet B (UV-B)-induced photodermatitis model in rats. The animals were divided into four groups (6/groups). The vehicle-control group animals received normal saline (10 ml/kg, p.o.) and standard group received retinoic acid (0.5 mg/kg, p.o.). Remaining groups were treated orally with the ethanolic extract of bark of Givotia rottleriformis (200 and 400 mg/kg, p.o.) and data were analyzed using one-way analysis of variance (ANOVA). The extract was standardized using chemical markers by high-performance liquid chromatography (HPLC) analysis. RESULTS: In case of psoriasis model, histopathological analysis revealed that in the section, there were absence of Munro's microabscess, elongation of rete ridges, and capillary loop dilation in ethanol extract (400 mg/Kg) and standard group. The ethanolic extract (200 and 400 mg/Kg) exhibited significant reduction (P < 0.01) in percentage of relative epidermal thickness as compared with positive control. In the HPLC analysis, 4 flavonoids were quantified by comparison to a calibration curve derived from the standard, rutin (0.215 mg/gm) quercetin (1.36 mg/gm), kaempferol (6.36 mg/gm) and luteolin (8.64 mg/gm). CONCLUSION: The crude extract containing ethanolic extract of Givotia rottleriformis bark have potent antipsoriatic activity in UV-B-induced psoriasis in rat.