Porphyromonas gingivalis(P. gingivalis) is an anaerobic gram-negative bacterium that colonizes in the epithelium and has been strongly associated with periodontal disease. Recently, various degrees of associations bet...Porphyromonas gingivalis(P. gingivalis) is an anaerobic gram-negative bacterium that colonizes in the epithelium and has been strongly associated with periodontal disease. Recently, various degrees of associations between P.gingivalis and digestive system cancers, including oral squamous cell carcinoma in the oral cavity, oesophageal squamous carcinoma in the digestive tract, and pancreatic cancer in pancreatic tissues, have been displayed in multiple clinical and experimental studies. Since P. gingivalis has a strong association with periodontal diseases, not only the relationships between P. gingivalis and digestive system tumours but also the effects induced by periodontal diseases on cancers are well-illustrated in this review. In addition, the prevention and possible treatments for these digestive system tumours induced by P. gingivalis infection are also included in this review. At the end, we also highlighted the possible mechanisms of cancers caused by P. gingivalis. One important carcinogenic effect of P. gingivalis is inhibiting the apoptosis of epithelial cells,which also plays an intrinsic role in protecting cancerous cells. Some signalling pathways activated by P. gingivalis are involved in cell apoptosis, tumourigenesis,immune evasion and cell invasion of tumour cells. In addition, metabolism of potentially carcinogenic substances caused by P. gingivalis is also one of the connections between this bacterium and cancers.展开更多
文摘目的:探讨肺腺癌转移相关转录因子1(metastasis-associated lungadenocarcinoma transcript 1,MALAT1)对口腔鳞状细胞癌侵袭能力的影响。方法:应用RT-PCR方法检测MALAT1在口腔鳞状细胞癌组织标本、正常口腔黏膜组织标本以及口腔鳞癌细胞系中的表达;利用小干扰RNA(si RNA)敲低MALAT1在人舌鳞状细胞癌细胞Tscca中的表达;MTT法检测细胞的增殖能力变化;划痕实验、Transwell实验检测肿瘤细胞迁移、侵袭能力的变化;蛋白质印迹法检测肿瘤细胞迁移、侵袭及上皮间质转化(epithelial-mesenchymal transition,EMT)等相关蛋白的表达变化;免疫荧光法检测细胞EMT相关蛋白表达变化;建立Tscca裸鼠皮下荷瘤模型,免疫组织化学染色法检测细胞增殖、侵袭相关蛋白表达。结果:MALAT1在口腔鳞癌组织中的表达明显高于正常组织。抑制MALAT1表达后细胞增殖率下降,细胞系划痕闭合减慢,通过Transwell小室聚碳酸酯膜的细胞数减少,与对照组比较,差异有统计学意义(P<0.05);基质金属蛋白酶-2、-9(MMP-2、MMP-9)、神经钙黏素(N-cadherin)蛋白表达水平明显下调,钙黏着蛋白(E-cadherin)表达水平上调。免疫荧光显示,细胞神经钙黏素荧光强度明显减弱,钙黏着蛋白荧光强度显著增强。体内实验结果显示,MALAT1 si RNA治疗组裸鼠皮下荷瘤体积小于空白对照组及无义序列组(F=18.664,P<0.001);免疫组织化学染色结果示,MALAT1 si RNA治疗组中增殖核抗原(PCNA)、MMP-2、MMP-9表达减少。结论:MALAT1在口腔鳞癌组织中过表达,敲低人舌鳞癌细胞中MALAT1的表达可抑制舌鳞癌细胞的迁移、侵袭能力,MALAT1可能通过调控EMT促进口腔鳞癌的增殖和侵袭过程。
基金Supported by Changzhou High-Level Medical Talents Training Project,No:2016ZCLJ002
文摘Porphyromonas gingivalis(P. gingivalis) is an anaerobic gram-negative bacterium that colonizes in the epithelium and has been strongly associated with periodontal disease. Recently, various degrees of associations between P.gingivalis and digestive system cancers, including oral squamous cell carcinoma in the oral cavity, oesophageal squamous carcinoma in the digestive tract, and pancreatic cancer in pancreatic tissues, have been displayed in multiple clinical and experimental studies. Since P. gingivalis has a strong association with periodontal diseases, not only the relationships between P. gingivalis and digestive system tumours but also the effects induced by periodontal diseases on cancers are well-illustrated in this review. In addition, the prevention and possible treatments for these digestive system tumours induced by P. gingivalis infection are also included in this review. At the end, we also highlighted the possible mechanisms of cancers caused by P. gingivalis. One important carcinogenic effect of P. gingivalis is inhibiting the apoptosis of epithelial cells,which also plays an intrinsic role in protecting cancerous cells. Some signalling pathways activated by P. gingivalis are involved in cell apoptosis, tumourigenesis,immune evasion and cell invasion of tumour cells. In addition, metabolism of potentially carcinogenic substances caused by P. gingivalis is also one of the connections between this bacterium and cancers.
