Blockage of chloride channels and anion transporters with pesticidal natural products and their synthetic analogs

Springer Science and Business Media LLC - Tập 10 - Trang 217-226 - 2010
Dhana Raj Boina1, Jeffrey R. Bloomquist2
1Department of Entomology and Nematology, Citrus Research and Education Center, University of Florida, Lake Alfred, USA
2Department of Entomology and Nematology, Emerging Pathogens Institute, University of Florida, Gainesville, USA

Tóm tắt

Ligand-gated chloride channels mediate a variety of functions in excitable membranes of nerve and muscle in insects, and have a long history as targets for neurotoxic insecticides. Recent findings from our laboratory confirm that the natural product silphinenes and their semi-synthetic analogs share a mode of action with the established ligand-gated chloride channel antagonist, picrotoxinin. The silphinenes are non-selective, being roughly equipotent on insect and mammalian receptors, but also possess lethal and neurotoxic effects on a dieldrin-resistant strain of Drosophila melanogaster. These findings suggest that silphinenes act on insect GABA receptors in a way that is different from picrotoxinin, and it is possible that resistant insect populations in the field could be controlled with insecticidal compounds derived from the silphinenes. Voltage-gated chloride channels and anion transporters provide additional classes of validated targets for insecticidal/nematicidal action. Anion transporter blockers are toxic to insects via an action on the gut, and RNAi studies implicate voltage-gated chloride channels in nematode muscle as another possible target. There was no cross resistance to DIDS in a dieldrin-resistant strain of Drosophila melanogaster, and no evidence for neurotoxicity. The potent paralytic actions of anion transporter blockers against nematodes, and stomach poisoning activity against lepidopteran larvae suggests they are worthy of further investigation as commercial insecticidal/nematicidal agents.

Tài liệu tham khảo

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