Background: The present study was designed to evaluate the anti-hyperalgesic effect of
kaempferol-3,7-di-O-α-L-rhamnopyranoside isolated from the ethyl acetate soluble part of Dryopteris
cycadina. Pretreatment of the compound at the doses of 2.5, 5, and 10 mg/kg caused a significant reduction
in abdominal constrictions in acetic acid-induced writhing test with maximum effect of 63.03%
(P < 0.001) at 10 mg/kg i.p. When subjected in formalin test, it evoked a marked antinociceptive effect
in both phases in a dose-dependent manner. The maximum (p < 0.01) pain-inhibiting effects were
61.36% and 65.89% in 1st and 2nd phases at 10 mg/kg i.p., respectively. Administration of atropine
(non-selective cholinergic receptor antagonist) significantly (p < 0.05) antagonized the antihyperalgesic
effect of the compound, while glibenclamide and naloxone did not alter the induced antinociceptive
effect and thus, antinociceptive activity of the compound is mediated, at least in part,
through cholinergic system antagonism; independent of calcium channel and opioidergic receptor participation.
Furthermore, docking studies underlined strong COX-2 inhibitory activity of the compound.
Result: Our data concluded that overall analgesic activity of the compound seems to involve COX-2
inhibition and activation of cholinergic receptors. However, further detailed studies are required in this
direction to confirm the analgesic effect of the compound for its possible clinical utility.