In the past decade, mosquitoes in many countries have become increasingly resistant to pyrethroid insecticides used to fend off mosquito-borne diseases such as malaria and dengue fever. Now, Ke Dong of Michigan State University and her colleagues have discovered a second pyrethroid-docking site in the molecular doorways, or channels, that control the flow of sodium into cells. Pyrethroids paralyze and kill mosquitoes and other insects by propping open the door and causing the pests to overdose on sodium, a critical regulator of nerve function. By providing new insights on pyrethroid action at the molecular level—and how mutations in the dual docking sites cause resistance—the findings open avenues to better monitoring and management of insecticide resistance.
Michigan State University News Release