赖氨酰氧化酶和基质金属蛋白酶2在胃癌组织中的表达及其与胃癌转移的关系

Expression of LOX and MMP-2 in gastric cancer tissue and the effects of LOX and MMP-2 on tumor invasion and metastasis

目的 探讨赖氨酰氧化酶（LOX）和基质金属蛋白酶2（MMP-2）在胃癌组织中的表达及其与胃癌转移的关系.方法 收集手术切除新鲜胃癌及相应的癌旁胃组织,用逆转录聚合酶链反应（RT-PCR）方法检测LOX mRNA和MMP-2 mRNA表达,Western blot方法检测LOX蛋白和MMP-2蛋白表达.结果 LOX mRNA在胃癌组织和癌旁胃组织中的相对表达量分别为0.5328±0.1367和0.2436±0.1372（P〈0.01）,MMP-2 mRNA在胃癌组织和癌旁胃组织中的相对表达量分别为0.7980±0.1571和0.3231±0.1672（P〈0.05） LOX mRNA在有淋巴结转移和无淋巴结转移的胃癌组织中的相对表达量分别为0.6336±0.1547和0.4914±0.1408,MMP-2 mRNA在有淋巴结转移和无淋巴结转移的胃癌组织中的相对表达量分别为0.8762±0.1381和0.6362±0.1936,差异均有统计学意义（均P〈0.05）.LOX蛋白在胃癌组织和癌旁胃组织中的相对表达量分别为0.5237±0.1426和0.2972±0.1480（P〈0.05）,在有淋巴结转移和无淋巴结转移的胃癌组织中相对表达量分别为0.6880±0.1263和0.4944±0.1217（P〈0.05） MMP-2蛋白在胃癌组织和癌旁胃组织中的相对表达量分别为0.7365±0.1607和0.3321±0.1480（P〈0.05）,在有淋巴结转移和无淋巴结转移的胃癌组织中相对表达量分别为0.8097±0.1632和0.5132土0.1366（P〈0.05）.胃癌组织中,LOX mRNA与MMP-2 mRNA、LOX蛋白与MMP-2蛋白相对表达量呈正相关（r=0.873,P〈0.001 r=0.881,P〈0.001） 在伴有淋巴结转移的胃癌组织中,LOX mRNA与MMP-2 mRNA、LOX蛋白与MMP-2蛋白相对表达量也呈正相关（r=0.923,P〈0.001 r=0.972,P〈0.001）.结论 LOX和MMP-2在胃癌组织中的表达明显高于相应的癌旁胃组织 在伴有淋巴结转移的胃癌组织中,LOX和MMP-2表达高于无淋巴结转移的胃癌组织,且LOX和MMP-2表达呈正相关,提示LOX和MMP-2对胃癌的发生和转移有促进作用,且两者可能有协同作用.

Objective To compare the expressions of lysyl oxidase （LOX） and matrix metalloproteinases-2 （MMP-2） in gastric cancer and pericancerous tissues, in gastric cancers.with and without lymph node metastasis, and to analyze the effects of LOX and MMP-2 on tumor invasion and metastasis.Methods Gastric cancer and pericancerous tissues were collected from 46 patients who underwent surgery.Levels of LOX and MMP-2 mRNA were detected by RT-PCR.Protein abundance of LOX and MMP-2 was examined using Western blot.Results Expressions of LOX and MMP-2 mRNA, and protein in 46 gastric cancers were significantly higher than that in 46 pericancerous tissues.In gastric cancer with lymph node metastasis, the levels of LOX and MMP-2 mRNA and protein were higher than those in gastric cancers without lymph node metastasis （ P 〈 0.05 ）.In the groups of gastric cancer with lymph node metastasis, expression of LOX was positively correlated with MMP-2 protein expression （ P 〈 0.01 ）.Conclusions Expressions of LOX and MMP-2 in gastric cancer tissues are significantly higher than that in pericancerous tissues.The expressions of LOX and MMP-2 in gastric cancer with lymph node metastasis are higher than that in gastric cancer without lymph node metastasis.Expressions of LOX and MMP-2 are positively correlated.The results suggest that LOX and MMP-2 may promote the growth and metastasis of gastric cancer.