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The Bacterial Redox Protein Azurin Induces Apoptosis in J774 Macrophages through Complex Formation and Stabilization of the Tumor Suppressor Protein p53

机译:细菌氧化还原蛋白天青素通过复合物形成和肿瘤抑制蛋白p53的稳定化诱导J774巨噬细胞凋亡。

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Two redox proteins, azurin and cytochrome c551 elaborated by Pseudomonas aeruginosa, demonstrate significant cytotoxic activity towards macrophages. Azurin can enter macrophages, localize in the cytosol and nuclear fractions, and induce apoptosis. Two redox-negative mutants of azurin have less cytotoxicity than does wild-type (wt) azurin. Azurin has been shown to form a complex with the tumor suppressor protein p53, a known inducer of apoptosis, thereby stabilizing it and enhancing its intracellular level. A higher level of reactive oxygen species (ROS), generated during treatment of macrophages with wt azurin, correlates with its cytotoxicity. Treatment with some ROS-removing antioxidants greatly reduces azurin-mediated cytotoxicity, thus demonstrating a novel virulence property of this bacterial redox protein.
机译:铜绿假单胞菌修饰的两种氧化还原蛋白,天青蛋白和细胞色素 c 551 对巨噬细胞具有明显的细胞毒性。天青素可以进入巨噬细胞,位于细胞质和核部分,并诱导凋亡。天青蛋白的两个氧化还原阴性突变体比野生型(wt)天青蛋白具有更低的细胞毒性。已显示出天青素与肿瘤抑制蛋白p53(一种已知的凋亡诱导剂)形成复合物,从而使其稳定并增强其细胞内水平。用wt azurin处理巨噬细胞期间产生的较高水平的活性氧(ROS)与它的细胞毒性有关。用一些去除ROS的抗氧化剂进行处理可大大降低天青素介导的细胞毒性,从而证明了这种细菌氧化还原蛋白具有新颖的毒力特性。

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