Endogenous expression of a Bt toxin receptor in the Cry1Ac-susceptible insect cell line and its synergistic effect with cadherin on cytotoxicity of activated Cry1Ac

文献类型： 外文期刊

第一作者： He, Fei

作者： He, Fei;Li, Jianghuai;Yang, Yongbo;Ai, Hui;Peng, Jianxin;Hong, Huazhu;Liu, Kaiyu;Xiao, Yutao;Liu, Chenxi

作者机构：

关键词： Spodoptera litura cell line;Bacillus thuringiensis;Cytotoxicity;ATP-binding cassette transporter;Cadherin

期刊名称：INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY （ 影响因子：4.714； 五年影响因子：4.953 ）

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收录情况： SCI

摘要： Although many insect cell lines derived from various tissues are available, it is unclear whether endogenous receptors of Bacillus thuringiensis (Bt) crystal toxins are expressed in these cell lines. In the present study, we demonstrated that the ovaries-derived Spodoptera aura SI-HP cell line was susceptible to activated Cry1Ac although larvae of S. litura are not susceptible to the toxin. Assays of the transcriptome revealed that thirteen ATP-binding cassette transporter genes (ABC) were expressed at different levels in this cell line. Of these, the S1ABCC3 shared 52-55% amino acid sequence identity with the known Bt toxin receptor ABCC2. RNAi-mediated knockdown targeting SIABCC3 significantly decreased the susceptibility of SI-HP cells to activated Cry1Ac. Over-expression of the gene strongly increased the susceptibility of Trichoplusia ni Hi5 cells to the toxin. Not only was SIABCC3 comparable to the heterologously expressed Helicoverpa armigera Hacadherin on the receptor-mediated cytotoxicity of activated Cry1Ac to Hi5 cells, but also SIABCC3 and Hacadherin had a strong synergistic effect on cytotoxicity of activated Cry1Ac. These results suggested that Bt toxin receptors-expressing insect cell lines can be used as an alternative model for evaluating cytotoxicity of Bt toxins and studying their mechanisms of action. (C) 2015 Elsevier Ltd. All rights reserved.

分类号： Q5

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