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Immunomodulatory effects of 1-(6-hydroxy-2-isopropenyl-1-benzofuran-5-yl)-1-ethanone from Petasites hybridus and its synthesized benzoxazepine derivatives

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Abstract

1-(6-Hydroxy-2-isopropenyl-1-benzofuran-5-yl)-1-ethanone (1), isolated from the roots of Petasites hybridus L., and a series of synthetic benzoxazepine derivatives of compound 1 (26) were evaluated for their immunomodulatory effects. The compounds were evaluated for their effects on the respiratory burst of human whole blood and isolated human polymorphonuclear leukocytes (PMNs) using luminol- and lucigenin-based chemiluminescence (CL) assays, and their effect on chemotactic migration of PMNs was assessed using the Boyden chamber technique. Compound 1 exhibited stronger inhibition than acetylsalicylic acid (ASA) on luminol-enhanced CL of PMNs. It also inhibited PMN chemotaxis with an IC50 value comparable to that of ibuprofen. Of the compounds tested, 5 was the most effective in inhibiting luminol-enhanced CL and also strongly inhibited lucigenin-enhanced CL with IC50 values lower than that of ASA. Compound 2 was the most active in inhibiting migration of PMNs and was five times stronger than ibuprofen. The results suggest that compound 1 and its synthesized benzoxazepine derivatives, especially compounds 2 and 5, were able to modulate the innate immune response of phagocytes at different steps, emphasizing their potential as leads for the development of new immunomodulatory agents.

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Acknowledgments

This work was supported by the Ministry of Higher Education, Malaysia, under the Fundamental Research Grant Scheme (FRGS)(grant number 03-FRGS0029-2010).

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Correspondence to Ibrahim Jantan.

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Khaleghi, F., Jantan, I., Din, L.B. et al. Immunomodulatory effects of 1-(6-hydroxy-2-isopropenyl-1-benzofuran-5-yl)-1-ethanone from Petasites hybridus and its synthesized benzoxazepine derivatives. J Nat Med 68, 351–357 (2014). https://doi.org/10.1007/s11418-013-0805-9

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  • DOI: https://doi.org/10.1007/s11418-013-0805-9

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