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Background  New mode-of-action insecticides are sought to provide continued control of pesticide resistant arthropod vectors of neglected tropical diseases (NTDs). We previously identified antagonists of the AaDOP2 D1-like dopamine receptor (DAR) from the yellow fever mosquito,  Aedes aegypti , with toxicity to  Ae .  aegypti  larvae as leads for novel insecticides. To extend DAR-based insecticide discovery, we evaluated the molecular and pharmacological characteristics of an orthologous DAR target,  Cq DOP2, from  Culex quinquefasciatus , the vector of lymphatic filariasis and West Nile virus.    Methods/Results    Cq DOP2 has 94.7% amino acid identity to  Aa DOP2 and 28.3% identity to the human D1-like DAR, hD1.  Cq DOP2 and  Aa DOP2 exhibited similar pharmacological responses to biogenic amines and DAR antagonists in cell-based assays. The antagonists amitriptyline, amperozide, asenapine, chlorpromazine and doxepin were between 35 to 227-fold more selective at inhibiting the response of  Cq DOP2 and  Aa DOP2 in comparison to hD1. Antagonists were toxic to both  C .  quinquefasciatus  and  Ae .  aegypti  larvae, with LC50 values ranging from 41 to 208 μM 72 h post-exposure. Orthologous DOP2 receptors identified from the African malaria mosquito,  Anopheles gambiae , the sand fly,  Phlebotomus papatasi  and the tsetse fly,  Glossina morsitans , had high sequence similarity to  Cq DOP2 and  Aa DOP2.    Conclusions  DAR antagonists represent a putative new insecticide class with activity against  C .  quinquefasciatus  and  Ae .  aegypti , the two most important mosquito vectors of NTDs. There has been limited change in the sequence and pharmacological properties of the DOP2 DARs of these species since divergence of the tribes Culicini and Aedini. We identified antagonists selective for mosquito versus human DARs and observed a correlation between DAR pharmacology and the  in vivo  larval toxicity of antagonists. These data demonstrate that sequence similarity can be predictive of target potential. On this basis, we propose expanded insecticide discovery around orthologous DOP2 targets from additional dipteran vectors.

Dopamine Receptor Antagonists as New Mode-of-Action Insecticide Leads for Control of Aedes and Culex Mosquito Vectors