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肺炎链球菌触发人肺Ⅱ型上皮细胞F-actin细胞骨架重排与TPK信号转导的相关性研究

Investigating on the relationship between F-actin rearrangements of type Ⅱ pneumocytes induced by Streptococcus pneumoniae and TPK signal transduction in vitro
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摘要 目的 :通过体外实验 ,研究Streptococcuspneumoniae(S pn)是否通过肺Ⅱ型上皮细胞 (A5 4 9)酪氨酸蛋白激酶 (TPK)信号转导途径触发微丝肌动蛋白 (Filamentousactin ,F actin)细胞骨架重排 ,进而导致S pn对A5 4 9细胞的侵袭。 方法 :采用F actin特异性FITC phalloidin荧光染料 ,观察S pn作用A5 4 9细胞前后的F actin细胞骨架重排情况 ,依照重排百分率得分标准以 (% )表示 ;用F actin细胞骨架重排抑制剂细胞松驰素D预处理A5 4 9细胞 ,观察S pn对A5 4 9细胞的侵袭率 ;使用TPK信号转导抑制剂Genistein预处理A5 4 9细胞 ,观察其与F actin细胞骨架重排百分率间是否存在剂量依赖关系。结果 :S pn作用A5 4 9细胞后 ,经FITC phalloidin荧光染色 ,F actin细胞骨架呈块状、丝状聚集 ;F actin细胞骨架重排抑制剂细胞松驰素D可明显降低S pn对A5 4 9细胞的侵袭率 ,在其浓度为 0 2 5 μg/ml时 ,未得到可测的细菌数 ;TPK信号转导途径抑制剂可部分抑制A5 4 9细胞F actin细胞骨架重排 ,并与F actin细胞骨架重排百分率间存在量效关系 ,其相关系数分别为rTPK= 0 91(P <0 0 5 )。结论 :上述结果提示S pn可通过TPK细胞信号转导途径触发A5 4 9细胞F actin细胞骨架重排 ,进而导致S pn侵袭A5 4 9细胞。 Objective:TO investigated whether Streptococcus pueumoniae(S.pn) could provoke filamentous actin(F-actin) rearrangements in vitro through TPK signaling pathways.Methods:Labelled F-actin with FITC-phalloidin,we observed F-actin rearrangements by S.pn adhesion of type Ⅱ pneumocytes (A549).S.pn invasion of A549 cells was determined by pretreating A549 cells with Cytochalasin D.To investigate whether F-actin rearrangements could be blocked by TPK inhibitors,A549 cells were pretreated with TPK inhibitors genistein.Results:Intact S.pn could promote F-actin rearrangements.Cytochalasin D was able to prevent S.pn invasion of A549 cells.Inhibitors of TPK signal transduction molecules block F-actin rearrangements dose dependently.Conclusion:S.pn could provoke F-actin rearrangements through TPK signaling pathways,which will further lead to S.pn invasion of A549 cells.
出处 《中国微生态学杂志》 CAS CSCD 2004年第2期85-86,88,共3页 Chinese Journal of Microecology
基金 国家自然科学基金项目 (编号 3 0 72 10 5 0 )
关键词 肺炎链球菌 肺Ⅱ型上皮细胞 细胞骨架 TPK信号转导 相关性 Streptococcus pneumoniae Signal transduction Cytoskeletal rearrangement Type Ⅱ pneumocyte
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参考文献6

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