title: Differential protein expression in the midgut of Culex quinquefasciatus mosquitoes induced by the insecticide temephos.
abstract: Mosquitoes are vectors for pathogens of malaria, lymphatic filariasis, dengue, chikungunya, yellow fever and Japanese encephalitis. Culex quinquefasciatus Say, 1823 (Diptera: Culicidae) is a known vector of lymphatic filariasis. Its control in Brazil has been managed using the organophosphate temephos. Studies examining the proteins of Cx. quinquefasciatus that are differentially expressed in response to temephos further understanding of the modes of action of the insecticide and may potentially identify resistance factors in the mosquito. In the present study, a comparative proteomic analysis, using 2-dimensional electrophoresis coupled with matrix-assisted laser desorption/ionization (MALDI) time of flight (TOF)/TOF mass spectrometry, and bioinformatics analyses were performed to identify midgut proteins in Cx. quinquefasciatus larvae that were differentially expressed in response to exposure to temephos relative to those in untreated controls. A total of 91 protein spots were differentially expressed; 40 were upregulated and 51 were downregulated by temephos. A total of 22 proteins, predominantly upregulated, were identified as known to play a role in the immune response, whereas the downregulated proteins were involved in energy and protein catabolism. This is the first proteome study of the midgut of Cx. quinquefasciatus and it provides insights into the molecular mechanisms of insecticide-induced responses in the mosquito.
authors.affiliation: Department of General Biology, State University of Viçosa, Viçosa, Brazil.
authors.forename: P D
authors.initials: PD
authors.lastname: Games
authors.affiliation: Department of Biology, State University of São João del-Rey, Divinópolis, Brazil.
authors.forename: S N
authors.initials: SN
authors.lastname: Alves
authors.affiliation: Biotechnology Core Facility and Department of Biochemistry and Molecular Biophysics, Kansas State University, Manhattan, KS, U.S.A.
authors.forename: B B
authors.initials: BB
authors.lastname: Katz
authors.affiliation: Biotechnology Core Facility and Department of Biochemistry and Molecular Biophysics, Kansas State University, Manhattan, KS, U.S.A.
authors.forename: J M
authors.initials: JM
authors.lastname: Tomich
authors.affiliation: Department of General Biology, State University of Viçosa, Viçosa, Brazil.
authors.forename: J E
authors.initials: JE
authors.lastname: Serrão
mesh_terms: D000818:Animals; D003465:Culex / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development; D004064:Digestive System; D015180:Electrophoresis, Gel, Two-Dimensional; D005786:Gene Expression Regulation / Q000187:drug effects*; D019476:Insect Proteins / Q000235:genetics* / Q000378:metabolism; D007306:Insecticides / Q000633:toxicity*; D007814:Larva / Q000187:drug effects / Q000235:genetics / Q000254:growth & development; D040901:Proteomics; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D000002:Temefos / Q000633:toxicity*
chemical_list: D019476:Insect Proteins; D007306:Insecticides; D000002:Temefos
keywords: Culex; Diptera; midgut; proteomics; temephos