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• W2800116371 abstract "Pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I and jasmolin II are six closely related insecticidal active esters, known as pyrethrins, found in the pyrethrum extract from the dry flowers of Tanacetum cinerariifolium. The chemical structures of the six compounds differ only in the terminal moieties at the acid and alcohol ends, but the compounds' in vivo toxicities are substantially different. Pyrethrins are lead compounds for pyrethroids, a large family of synthetic insecticides that alter nerve functions by prolonging the opening of voltage-gated sodium channels. However, data on the mechanism of action of natural pyrethrins are very limited. In this study, we examined the actions of all six pyrethrins on cockroach sodium channels expressed in Xenopus oocytes. Although the six compounds showed comparable potencies in inhibiting the inactivation of sodium channels, they had greatly variable potencies in inhibiting channel deactivation. Furthermore, unlike pyrethroids, the action of pyrethrins neither depend on nor were enhanced by repeated channel activation. We created a NavMs-based model of the cockroach sodium channel, in which pyrethrin II was docked at the pyrethroid receptor site 1 (PyR1), and proposed a rationale for the observed structure-activity relationship of the six pyrethrins. Our study sheds light on the molecular mechanism of pyrethrum action on sodium channels and reveled differences in the modes of action of the six bioactive constitutes of pyrethrum." @default.
• W2800116371 created "2018-05-17" @default.
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• W2800116371 date "2018-10-01" @default.
• W2800116371 modified "2023-10-16" @default.
• W2800116371 title "Action of six pyrethrins purified from the botanical insecticide pyrethrum on cockroach sodium channels expressed in Xenopus oocytes" @default.
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• W2800116371 doi "https://doi.org/10.1016/j.pestbp.2018.05.002" @default.
• W2800116371 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30704718" @default.
• W2800116371 hasPublicationYear "2018" @default.
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