地塞米松及Lat—A对人眼小梁细胞蛋白质表达的影响

目的探讨地塞米松（Dex）及latrunculin—A（Lat-A）处理后人眼小梁细胞蛋白质表达的变化。方法正常供体人眼小梁细胞培养后用Dex及Lat—A处理，经二维凝胶电泳分离小梁细胞蛋白质，分析凝胶电泳图谱，选取部分差异凝胶斑点并采用基质辅助激光解析电离飞行时间质谱（MALDI—TOFMS）鉴定蛋白质。结果采用24cm IPG胶条获得正常人眼小梁细胞对照组、Dex组、Dex＋Lat—A组以及Lat—A组的二维电泳凝胶图谱，得出不同培养条件下人眼小梁细胞蛋白质表达的差异。应用GDPi MALDI—TOFMS得出不同培养条件下差异表达的蛋白质斑点并成功鉴定出其中的24种蛋白质，主要包括细胞骨架相关的蛋白、热休克蛋白、氧化还原相关的蛋白和糖代谢相关的蛋白4类蛋白质。ADLH和Rab蛋白在Lat—A组的人小梁细胞中表达增加，但在Dex组表达减少，而热休克蛋白27（HSP27）和人CRMP2呈现相反的结果。结论成功建立Dex及Lat—A诱导人眼小梁细胞蛋白质表达图谱。Dex及Lat—A能诱导人眼小梁细胞的蛋白质表达变化，可能与青光眼致病的分子机制相关。

Effects of dexamethasone and latrunculin A on expression of protein in human trabecular meshwork cell

Background Researches have demonstrated that dexamethasone (Dex) can induce the changes of the function and structure of trabecular meshwork cells,and latrunculin A (Lat A) can enhance the outflow of aqueous humour and therefore low the intraocular pressure.Objective The aim of the present study is to investigate the effects of Dex and Lat A on the expression of protein in human trabecular meshwork cells.Methods Human trabecular meshwork cells were primarily cultured in DMEM using expand culture method and the fifth generation of cells were used to this experiment.Dex and/or Lat A were added in medium as 10~(-6)mol/L Dex group(Dex treating for 24 hours),Dex+Lat A group(10~(-6)mol/L Dex+2mmol/L Lat A for 24 hours),Lat A group(2mmol/L Lat A for 24 hours) and DMEM culture group.Two dimensional gel electrophoresis(2 DE) was used to compare the protein expressions among these four groups.Subsequently protein spots with different intensity were selected for mass spectrometry analysis.Results Four gel patterns of two dimensional gel electrophoresis of human trabecular meshwork cells from Dex,Dex+Lat A,Lat A and control groups were obtained.A good isolated result for majority of proteins in human trabecular meshwork cells was found in all of the four groups.An obvious expression difference of proteins in human trabecular meshwork cells was seen among the different culture conditions.Twenty four kinds proteins were identified by GDPiMALDI TOF MS,including cytoskeleton related proteins,heat shock proteins,redox related proteins,and proteins participating in carbohydrate metabolism.The expressions of aldehyde dehydrogenase(ADLH)and Rab were increased in Lat A group and decreased in Dex group,but HSP27 and hCRMP2 showed the contrary outcome.Conclusion This study construct the pattern of protein expression in human trabecular meshwork cells by using 2 DE.Dex and Lat A impact the protein expressions in human trabecular meshwork cells.