幽门螺旋杆菌诱导基质金属蛋白酶-9表达的研究

目的 通过研究幽门螺旋杆茼对基质金属蛋白酶表达水平的影响，探讨幽门螺旋杆茼致病的分子机理。方法 ATCC49503(CagA^ )、HP30929(CagA^-)幽门螺旋杆茼分别与BGC-823共同培养后提取总RNA，用RT-PCR方法分析BGC-823细胞中MMP-9的表达水平；通过胃镜活检选取9例HP阳性胃溃疡、9例HP阴性胃溃疡患者的标本采用RT-PCR分析MMP-9的表达水平；取17例HP阳性和14例HP阴性的胃溃疡标本经切片后石蜡包埋，用免疫组化染色检测MMP-9表达并图象定量分析测量MMP-9染色阳性的面积。结果 HP能诱导MMP-9在BGC-823细胞中表达，CagA^ HP株明显强于CagA^-株；在HP阳性胃溃疡的胃黏膜上皮细胞中，MMP-9表达水平明显高于HP阴性胃溃疡。结论 HP诱导MMP-9的表达在胃溃疡、胃癌的病理过程中可能起到重要的作用。

The Induction of Matrix Metalloproteinase-9 Expression by Helicobacterium Pylori

Objective To study the pathogenic molecular mechanism of H.pylori through analyzing its effect of on MMP-9 expression. Methods BGC-823 cells were cocultured with ATCC49503(CagA +)and HP 030811 (CagA -) H.pylori strains respectively, then the total cellelar RNA was extracted. The MMP-9 mRNA expression in BGC-823 cells, 9 cases of H.pylori-positive and 9 cases of H.pylori-negative gastric ulcer biopsy tissues was detected by RT-PCR. The MMP-9 protein expression on the paraffin-imbedded tissue sections of 17 cases of H.pylori-positive and 14 cases of H.pylori-negative gastric ulcer tissues was detected with immunohistochemical technique, and was quantified by image quantitative analysis. Results H.pylori induced MMP-9 expression in BGC-823, and the level of MMP-9 expression induced by CagA -postive H.pylori strain was higher than that by CagA -negative one. MMP-9 expression level was higher in the H.pylori-positive gastric ulcer tissues than that in the H.pylori-negative ones. Conclusion H.pylori-induced MMP-9 expression may play an important role in gastric ulcer formation and gastric carcinogenesis.