title: The Spodoptera exigua (Lepidoptera: Noctuidae) ABCC2 Mediates Cry1Ac Cytotoxicity and, in Conjunction with Cadherin, Contributes to Enhance Cry1Ca Toxicity in Sf9 Cells.
abstract: In insects, the mode of Cry1A toxins action has been studied in detail and many receptors that participate in the process are known. Recent evidence has revealed that an ABC transporter (ABCC2) is involved in conferring resistance to Cry1A toxins and that ABCC2 could be a receptor of Cry1A. However, it is not known whether Cry1Ca interacts with the same receptor proteins as Cry1A. In this study, we report the cloning of an ABC transporter gene, SeABCC2b, from the midgut of Spodoptera exigua (Hübner) larvae, and its expression in Sf9 cells for a functional analysis. The addition of Cry1Ca and Cry1Ac to Sf9 cell culture caused swelling in 28.5% and 93.9% of the SeABCC2-expressing cells, respectively. In contrast, only 7.4% and 1.3% of the controls cells swelled in the presence of Cry1Ca and Cry1Ac. Thus, SeABCC2b-expressing Sf9 cells had increased susceptibility to Cry1Ca and Cry1Ac. Similarly, S. exigua cadherin (SeCad1b) expressed in Sf9 cells caused 47.1% and 1.8% of the SeCad1b-expressing cells to swell to Cry1Ca and Cry1Ac exposure. Therefore, Sf9 cells expressing SeCad1b were more sensitive to Cry1Ca than Cry1Ac. Together, our data suggest that SeABCC2b from S. exigua mediates Cry1Ac cytotoxicity and, in conjunction with SeCad1b, contributes to enhance Cry1Ca toxicity in Sf9 cells.
authors.affiliation: Institute of Cotton Research of CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China.|Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China.
authors.forename: Xiang-Liang
authors.initials: XL
authors.lastname: Ren
authors.affiliation: Institute of Cotton Research of CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China.
authors.forename: Wei-Li
authors.initials: WL
authors.lastname: Jiang
authors.affiliation: Institute of Cotton Research of CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China.
authors.forename: Ya-Jie
authors.initials: YJ
authors.lastname: Ma
authors.affiliation: Institute of Cotton Research of CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China.
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Hu
authors.affiliation: Institute of Cotton Research of CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Ma
authors.affiliation: Institute of Cotton Research of CAAS/State Key Laboratory of Cotton Biology, Anyang, Henan 455000, China aymayan@126.com.
authors.forename: Yan
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Education Ministry Key Laboratory of Integrated Management of Crop Diseases and Pests, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China (ligq@njau.edu.cn).
authors.forename: Guo-Qing
authors.initials: GQ
authors.lastname: Li
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis / Q000235:genetics; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000494:pharmacology*; D015820:Cadherins / Q000235:genetics* / Q000378:metabolism; D004731:Endotoxins / Q000494:pharmacology*; D006460:Hemolysin Proteins / Q000494:pharmacology*; D019476:Insect Proteins / Q000235:genetics* / Q000378:metabolism; D007814:Larva / Q000187:drug effects / Q000254:growth & development; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins / Q000235:genetics* / Q000378:metabolism; D061987:Sf9 Cells; D018411:Spodoptera / Q000187:drug effects* / Q000254:growth & development
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D015820:Cadherins; D004731:Endotoxins; D006460:Hemolysin Proteins; D019476:Insect Proteins; D000089762:Multidrug Resistance-Associated Protein 2; D027425:ATP-Binding Cassette, Sub-Family C Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis
keywords: SeABCC2; Sf9 cell; cadherin; crystal toxin; cytotoxicity