Bitter-sensitive gustatory receptor neuron responds to chemically diverse insect repellents in the common malaria mosquito Anopheles quadrimaculatus.
Female mosquitoes feed on blood from animal hosts to obtain nutritional resources used for egg production. These contacts facilitate the spread of harmful human diseases. Chemical repellents are used to disrupt mosquito host-seeking and blood-feeding behaviors; however, little is known about the gustatory sensitivity of mosquitoes to known repellents. Here, we recorded electrical responses from gustatory receptor neurons (GRNs) housed within the labellar sensilla of female Anopheles quadrimaculatus to N,N-diethyl-3-methylbenzamide (DEET), picaridin, IR3535, 2-undecanone, p-menthane-3,8-diol, geraniol, trans-2-hexen-1-ol, quinine, and quinidine. A bitter-sensitive GRN responded to all tested repellents and quinine, a known feeding deterrent. Responses of the bitter-sensitive neuron to quinine and an isomer, quinidine, did not differ. Delayed bursts of electrical activity were observed in response to continuous stimulation with synthetic repellents at high concentrations. Electrophysiological recordings from bitter-sensitive GRNs associated with mosquito gustatory sensilla represent a convenient model to evaluate candidate repellents.
United States Department of Agriculture, Agricultural Research Service, Henry A. Wallace Beltsville Agricultural Research Center, Invasive Insect Biocontrol and Behavior Laboratory, Bldg. 007, Rm. 030, 10300 Baltimore Avenue, Beltsville, MD, 20705, USA.
Jackson T
JT
Sparks
United States Department of Agriculture, Agricultural Research Service, Henry A. Wallace Beltsville Agricultural Research Center, Invasive Insect Biocontrol and Behavior Laboratory, Bldg. 007, Rm. 030, 10300 Baltimore Avenue, Beltsville, MD, 20705, USA. joseph.dickens@ars.usda.gov.
Joseph C
JC
Dickens
D000818:Animals; D000852:Anopheles / Q000187:drug effects* / Q000502:physiology*; D002628:Chemoreceptor Cells / Q000187:drug effects / Q000502:physiology; D055724:Electrophysiological Phenomena / Q000187:drug effects; D005260:Female; D007302:Insect Repellents / Q000494:pharmacology*; D009474:Neurons / Q000187:drug effects / Q000502:physiology; D013649:Taste
D007302:Insect Repellents
Bitter; Chemosensory; Electrophysiology; Mosquito; Repellent; Taste