Introduction:The anthelmintic activity of various extracts of leaves of Ocimum sanctum and Mallotus phillipensis was assessed in vitro against Setaria digitata. Materials and Methods: The leaves of Ocimum sanctum and Mallotus phillipensis were collected and were extracted using methanol, dried and stored under refrigeration till further use. The aqueous extract was taken as a decoction. The methanolic extract was further fractionated by taking solvents of increasing polarity viz, hexane, chloroform, n-butanol and water. The extract as well as the fractions were analysed qualitatively for various phytochemical constituents. Fresh nematodes (Setaria digitata) were recovered manually from the peritoneum of infested buffalo, were washed and transferred to the extract containing petriplates (concentrations of 50, 25, 12.5, 6.25, 3.125 and 1.56 mg/ml) immediately and the motility/death of Setaria digitata was noted. Results: The presence of flavonoids and tannins were detected in all the extracts where was phenolics as absent in the hexane fraction. The methanolic extract of Tulsi and Kamla produced death of nematodes in concentrations of 3.125 mg/ml and the extract of tulsi was found to be more potent. Similar results were also observed in the case of hydro alcoholic extract whereas the aqueous extract showed no effect. The chloroform fraction of Ocimum sanctum and n-butanol and chloroform fractions of Mallotus were equally potent in inhibiting the motility and producing death of the worms. The control drug, albendazole produced death in 30 minutes in both the concentrations. Conclusion: It could be concluded that higher doses of the extract are as potent as albendazole.Key words: Anthelmintic, Albendazole, Mallotus phillipensis, Ociumum sanctum, Setaria digitata. SUMMARY• The phytochemical analysis revealed the presence of tannins, flavonoids, terpenes and phenolic compounds in almost all extracts of Ocimum sanctum and Mallotus phillipensis.• Methanolic and hydroalcoholic extracts of Mallotus phillipensis produced death of Setaria in concentrations of 1.56 mg/ml where as Tulsi extracts did it at 3.125 mg/ml.• The extracts showed no toxicity on acute oral toxicity testing in rats.• Presence of saponins and tannins may be the cause of the anthelmintic property of the extracts.
Prostaglandins are a group of important cell-signaling molecules involved in the regulation of ovarian maturation, oocyte development, egg laying and associated behaviors in invertebrates. However, the presence of prostaglandin E2 (PGE2), the key enzymes for PGE2 biosynthesis and its interference by drugs were not investigated previously in the ovary of ticks. The present study was undertaken to assess the modulation of the PGE2-mediated pathway in the eclosion blocking effect of flumethrin and terpenoid subfraction isolated from Artemisia nilagirica in Rhipicephalus annulatus ticks. The acaricidal activities and chemical profiling of the terpenoid subfraction were performed. The localization of the cyclooxygenase1 (COX1) and prostaglandin E synthase (PGES) enzymes and the quantification of PGE2 in the ovaries of the ticks treated with methanol (control), flumethrin and terpenoid subfraction were also undertaken. In addition, the vitellogenin concentration in hemolymph was also assayed. Both flumethrin and the terpenoid subfraction of A. nilagirica elicited a concentration-dependent inhibition of fecundity and blocking of hatching of the eggs. The COX1 could not be detected in the ovaries of treated and control ticks, while there was no significant difference observed in the concentration of vitellogenin (Vg) in them. The presence of PGES in the oocytes of control ticks was confirmed while the immunoreactivities against PGES were absent in the vitellogenic oocytes of ticks treated with flumethrin and terpenoid subfraction. The levels of PGE2 were below the detection limit in the ovaries of the flumethrin-treated ticks, while it was significantly lower in the ovaries of the terpenoid subfraction-treated ticks. Hence, the prostaglandin E synthase and PGE2 were identified as very important mediators for the signaling pathway for ovarian maturation and oviposition in ticks. In addition, the key enzyme for prostaglandin biosynthesis, PGES and the receptors for PGE2 can be exploited as potential drug targets for tick control. The detection of PGES by immunohistochemistry and quantification of PGE2 by LC-MSMS can be employed as valuable tools for screening newer compounds for their eclosion blocking acaricidal effects.
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