绿脓假单胞菌感染中耳上皮细胞可以激活TGF-β1 Smad信号通路
Infection of Pseudomonas aeruginosa Activates TGF-β1 Smad Signaling Pathway in Human Middle Ear Epithelial Cells
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摘要: 目的 探讨绿脓假单胞菌 (pseudomonas aeruginosa, P.aeruginosa) 在感染中耳上皮细胞过程中的作用机制.方法 采用Real-time PCR和Western blotting方法检测绿脓假单胞菌感染中耳上皮细胞后, 转化生长因子-β1 (TGF-β1) 和Smad2蛋白的mR和蛋白水平以及Smad7蛋白的磷酸化水平.结果 绿脓假单胞菌在感染中耳上皮细胞过程中显著上调TGF-β1和Smad2的m RNA和蛋白水平, 同时抑制了Smad7的磷酸化;突变型 (Opr F) 绿脓假单胞菌和采用蛋白激酶C (protein kinase C, PKC) 抑制剂Bisindolylmaleimide I处理中耳上皮细胞均可以下调TGF-β1和Smad2的m RNA和蛋白水平, 同时促进Smad7蛋白的磷酸化.结论 绿脓假单胞菌感染中耳上皮细胞可以激活TGF-β1/Smad信号通路.
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关键词:
- 绿脓假单胞菌 /
- 人中耳上皮细胞 /
- TGF-β1/Smad信号通路 /
- 蛋白激酶C
Abstract: Objective To study the molecular mechanism of the infection process of Pseudomonas aeruginosa in human middle ear epithelial cells (HMEECs) . Methods Real-time PCR and Western blotting method were used to detect the m RNA and protein levels of TGF-β1 and Smad2, and the phosphorylation of Smad7 in the infection process of Pseudomonas aeruginosaonhuman middle ear epithelial cells. Results Infection of Pseudomonas aeruginosa in human middle ear epithelial cells significantly increased the m RNA and protein levels of TGF-β1 and Smad2, and also inhibited the phosphorylation of Smad7. Mutation of Opr F and PKC inhibitor Bisindolylmaleimide I could derease the m RNA and protein levels of TGF-β1 and Smad2 and the enhanced the phosphorylation of Smad7 compared with Pseudomonasaeruginosa infected HMEECs. Conclusion Infection of Pseudomonas aeruginosaonhuman activates the TGF-β1 Smad signaling pathway in middle ear epithelial cells. -
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