热休克蛋白在慢性萎缩性胃炎及胃癌中的表达及意义

目的 探讨热休克蛋白(HSP)90和HSP70在慢性萎缩性胃炎及胃癌中的表达及意义.方法 收集2005年4月至2006年4月慢性浅表性胃炎患者35例、慢性萎缩性胃炎患者66例(轻度21例、中度30例、重度15例)和胃癌患者40例.中位年龄分别为47.8、56.1和59.4岁.幽门螺杆菌(Hp)阳性在慢性浅表性胃炎和萎缩性胃炎者中分别为12例和28例.HSP70和HSP90的定性检测采用免疫组化法,基因和蛋白检测分别采用Western印迹和实时荧光聚合酶链反应法.结果 HSP70基因表达在萎缩性胃炎(1.41±0.80)中高于浅表性胃炎(1.31±0.80)和胃癌(1.18±0.70),差异有统计学意义(P＜0.05);且在轻、中度萎缩者中呈低表达.分别为1.32±0.70和1.34±0.60,而在重度萎缩者中明显升高(2.20±0.80,P＜0.05),HSP90的基因表达从浅表性胃炎(1.27±0.60)、萎缩性胃炎(1.53±O.80)至胃癌(1.84±0.70)呈逐步升高趋势;且在轻度(1.33±0.60)、中度(1.47±0.90)、重度(2.75±0.70)萎缩性胃炎中亦呈逐步升高趋势(P＜0.05).HSP90表达在Hp阳性(1.63±0.80)萎缩性胃炎患者中高于阴性患者(1.35±0.50).两者间差异有统计学意义(P＜0.05).结论 HSP70和HSP90同步升高预示慢性萎缩性胃炎的萎缩程度加重,而当HSP70下降而HSP90上升时提示胃癌发生可能.

The expression of heat shock protein 70/90 in patients with atrophic gastritis or gastric cancer and its significance

Objective To investigate the expression of heat shock protein(HSP)70 and HSP90 in patients with atrophic gastritis(AG)or gastric cancer(GC)and its significance.Methods One hundred and forty-one patients including 35 with superficial gastritis(CSG),66 with AG(miner in 21,medium in 30 and severe in 15)and 40 with GC were enrolled with mean age of 47.8,56.1 or 59.4 years,respectively.H.pylori positive patients were 12 with CSG and 28 with AG.The quantity analysis of HSP90 and HSP70 were detected by immunohistochemistry,whereas their mRNA and protein expressions were measured by Western bolt and real-time PCR,respectively.Results The mRNA expression of HSP70 was significantly higher in CSG(1.31±0.80)and AG(1.41±0.80)than that in GC(1.18±0.70,P＜0.05),but was significantly lower in miner(1.32±0.70)and medium(1.34±0.60)AG than that in severe AG(2.20±0.80,P＜0.05).The mRNA expression of HSP90 was kept on increasing in order of CSG(1.27±0.60),AG(1.53±0.80)and GC(1.84±0.70); or in order of miner(1.33±0.60),medium(1.47±0.90)and severe(2.75±0.70)(P＜0.05).The patients infected with H.pylori had higher expression of HSP90 compared with those without H. pylori infection (P＜0.05). Conclusion The synchronous increase of HSP90 and HSP70 indicates the aggravation of AG. When HSP90 is up-regulated and HSP70 is down-regulatied, it may predict the occurrence of cancer.