Journal
MEDICAL AND VETERINARY ENTOMOLOGY
Volume 25, Issue 4, Pages 436-444Publisher
WILEY
DOI: 10.1111/j.1365-2915.2011.00949.x
Keywords
Aedes aegypti; agonist; antagonist; indole; modulator; mosquito; octenol; odorant receptor; pyrethroid; repellent
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Funding
- National Institute of Child Health and Human Development, National Institutes of Health
- Deployed War Fighter Protection (DWFP) Research Program
- U.S. Department of Defense through the Armed Forces Pest Management Board (AFPMB)
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Several lines of evidence suggest that insect repellent molecules reduce mosquito-host contacts by interacting with odorants and odorant receptors (ORs), thereby ultimately affecting olfactory-driven behaviours. We describe the molecular effects of 10 insect repellents and a pyrethroid insecticide with known repellent activity on two highly specific Aedes aegypti (Diptera: Culicidae) ORs, AaOR2 + AaOR7 and AaOR8 + AaOR7, exquisitely sensitive to key mosquito attractants indole and (R)-(-)-1-octen-3-ol, expressed in oocytes of Xenopus (Anura: Pipidae). Our study demonstrates that insect repellents can both inhibit odorant-evoked currents mediated by ORs and independently elicit currents in the absence of odorants. All of the repellents had effects on one or both ORs; most of these compounds were selective inhibitors and showed a high degree of specificity in their capacity to activate the two ORs. These results show that a range of insect repellents belonging to structurally diverse chemical classes modulate the function of mosquito ORs through multiple molecular mechanisms.
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