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香鱼巨噬细胞炎性蛋白-2基因的克隆、序列分析及表达

, PP. 143-149

Keywords: 巨噬细胞炎性蛋白-2,香鱼,鳗利斯顿氏菌感染,基因表达

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Abstract:

巨噬细胞炎性蛋白-2(MIP-2)是一种重要的趋化因子,可趋化中性粒细胞到炎症部位,从而消除炎症反应。从香鱼巨噬细胞转录组测序中获得MIP-2基因,阅读框序列长为318个核苷酸,编码一个由105个氨基酸组成、相对分子质量为11.6kD的前体蛋白。N端19个氨基酸为信号肽序列。氨基酸序列分析表明,香鱼MIP-2与白斑狗鱼MIP-2的氨基酸同源性最高,为54%。健康香鱼MIP-2基因mRNA主要在脾、肾、脑、鳃中表达,在肝、心、肌肉、肠中表达量次之。实时荧光定量PCR结果显示,鳗利斯顿氏菌侵染香鱼后,各组织中MIP-2基因mRNA表达量均呈上调趋势。尤其以肾组织和肌肉组织中变化最显著。以上结果表明,香鱼MIP-2基因表达与鳗利斯顿氏菌的侵染密切相关,揭示了MIP-2可能在香鱼抗菌免疫反应中具有重要的作用。

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