目的:探讨Hpylori对人正常胃黏膜上皮细胞永生细胞株GES-1和人淋巴结转移胃腺癌细胞株SGC-7901的氧化性DNA损伤作用.方法:采用细菌-细胞共培养的方法,比较Hpylori作用前后GES-1和SGC-7901细胞株的形态学变化;采用激光扫描共聚焦显微镜方...目的:探讨Hpylori对人正常胃黏膜上皮细胞永生细胞株GES-1和人淋巴结转移胃腺癌细胞株SGC-7901的氧化性DNA损伤作用.方法:采用细菌-细胞共培养的方法,比较Hpylori作用前后GES-1和SGC-7901细胞株的形态学变化;采用激光扫描共聚焦显微镜方法,比较Hpylori作用前后GES-1和SGC-7901细胞株8-羟基脱氧鸟苷(8-OhdG)的表达.结果:Hpylori对GES-1和SGC-7901细胞株均具有损伤作用;8-OHdG表达升高,加菌组与对照组相比差别具有统计学意义(64.9396±17.8142 vs 32.3010±7.3620;102.8344±30.2632 vs 77.1336±32.3223,均P=0.000);而且8-OHdG表达的变化程度GES-1细胞显著高于SGC-7901细胞.结论:Hpylori能够诱导GES-1和SGC-7901细胞DNA氧化性损伤显著增加;在Hpylori氧化损伤的相关研究中,更适宜选择对损伤作用敏感的GES-1细胞株作为研究对象.展开更多
AIM： Nitrative and oxidative DNA damage such as 8-nitroguanine and 8-oxo-7,8-dihydro-2＇-deoxyguanosine （8-oxodG） formation has been implicated in initiation and/ or promotion of inflammation-mediated carcinogenesi...AIM： Nitrative and oxidative DNA damage such as 8-nitroguanine and 8-oxo-7,8-dihydro-2＇-deoxyguanosine （8-oxodG） formation has been implicated in initiation and/ or promotion of inflammation-mediated carcinogenesis. The aim of this study is to clarify whether these DNA lesions participate in the progression of intrahepatic cholangiocarcinoma. METHODS： We investigated the relation of the formation of 8-nitroguanine and 8-oxodG and the expression of hypoxia-inducible factor-1α （HIF-1α） with tumor invasion in 37 patients with intra-hepatic cholangiocarcinoma. RESULTS： Immunohistochemical analyses revealed that 8-nitroguanine and 8-oxodG formation occurred to a much greater extent in cancerous tissues than in non-cancerous tissues. HIF-1α could be detected in cancerous tissues in all patients, suggesting low oxygen tension in the tumors. HIF-1α expression was correlated with inducible niltric oxide synthase （iNOS） expression （r = 0.369 and P = 0.025） and 8-oxodG formation （r = 0.398 and P = 0.015）. Double immunofluorescence study revealed that iNOS and HIF-1α co-localized in cancerous tissues. Notably, the formation of 8-oxodG was correlated significantly with lymphatic invasion （r = 0.386 and P = 0.018）. Moreover, 8- nitroguanine and 8-oxodG in non-cancerous tissues were associated significantly with neural invasion （P = 0.042 and P = 0.026, respectively）. These results suggest that reciprocal activation between HIF-1α and iNOS mediates persistent DNA damage, which induces tumor invasiveness via mutations, resulting in poor prognosis. CONCLUSION： The formation of 8-nitroguanine and 8-oxodG plays an important role in multiple steps of genetic changes leading to tumor progression, including invasiveness.展开更多
To estimate the antioxidant activities of Peanut polypeptides （PPs） by using a chemiluminescence （CL） method in vitro. The scavenging ability of PPs on superoxide anion, hydroxide radical, and hydrogen peroxide wa...To estimate the antioxidant activities of Peanut polypeptides （PPs） by using a chemiluminescence （CL） method in vitro. The scavenging ability of PPs on superoxide anion, hydroxide radical, and hydrogen peroxide was determined by the Pyrogallol-Luminol system, the CuSO4-Phen-Vc-H2O2 system, and the luminol-H2O2 system, respectively. DNA damage preventing the effect of PPs was determined by the CuSO4-Phen-Vc-H2O2-DNA CL system. The results shows that PPs had good effect on the scavenging ability of superoxide anion （IC50=9.68±0.12 mg/ml）. PPs could scavenge hydroxide radical effectively （the IC50 value was 46.06±0.08 μg/ml）. PPs had a good scavenging ability on hydrogen peroxide, which had a relatively low IC50 value （0.17±0.07 mg/ml）. PPs （the IC50 value was0.72±0.11 mg/ml） were powerful on the DNA damage preventing effect. PPs possesses a good scavenging potency on ROS in different systems, but different results exist in different systems.展开更多
文摘目的:探讨Hpylori对人正常胃黏膜上皮细胞永生细胞株GES-1和人淋巴结转移胃腺癌细胞株SGC-7901的氧化性DNA损伤作用.方法:采用细菌-细胞共培养的方法,比较Hpylori作用前后GES-1和SGC-7901细胞株的形态学变化;采用激光扫描共聚焦显微镜方法,比较Hpylori作用前后GES-1和SGC-7901细胞株8-羟基脱氧鸟苷(8-OhdG)的表达.结果:Hpylori对GES-1和SGC-7901细胞株均具有损伤作用;8-OHdG表达升高,加菌组与对照组相比差别具有统计学意义(64.9396±17.8142 vs 32.3010±7.3620;102.8344±30.2632 vs 77.1336±32.3223,均P=0.000);而且8-OHdG表达的变化程度GES-1细胞显著高于SGC-7901细胞.结论:Hpylori能够诱导GES-1和SGC-7901细胞DNA氧化性损伤显著增加;在Hpylori氧化损伤的相关研究中,更适宜选择对损伤作用敏感的GES-1细胞株作为研究对象.
基金Supported by the Khon Kaen University Research Fund in Thailand Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture of Japan
文摘AIM： Nitrative and oxidative DNA damage such as 8-nitroguanine and 8-oxo-7,8-dihydro-2＇-deoxyguanosine （8-oxodG） formation has been implicated in initiation and/ or promotion of inflammation-mediated carcinogenesis. The aim of this study is to clarify whether these DNA lesions participate in the progression of intrahepatic cholangiocarcinoma. METHODS： We investigated the relation of the formation of 8-nitroguanine and 8-oxodG and the expression of hypoxia-inducible factor-1α （HIF-1α） with tumor invasion in 37 patients with intra-hepatic cholangiocarcinoma. RESULTS： Immunohistochemical analyses revealed that 8-nitroguanine and 8-oxodG formation occurred to a much greater extent in cancerous tissues than in non-cancerous tissues. HIF-1α could be detected in cancerous tissues in all patients, suggesting low oxygen tension in the tumors. HIF-1α expression was correlated with inducible niltric oxide synthase （iNOS） expression （r = 0.369 and P = 0.025） and 8-oxodG formation （r = 0.398 and P = 0.015）. Double immunofluorescence study revealed that iNOS and HIF-1α co-localized in cancerous tissues. Notably, the formation of 8-oxodG was correlated significantly with lymphatic invasion （r = 0.386 and P = 0.018）. Moreover, 8- nitroguanine and 8-oxodG in non-cancerous tissues were associated significantly with neural invasion （P = 0.042 and P = 0.026, respectively）. These results suggest that reciprocal activation between HIF-1α and iNOS mediates persistent DNA damage, which induces tumor invasiveness via mutations, resulting in poor prognosis. CONCLUSION： The formation of 8-nitroguanine and 8-oxodG plays an important role in multiple steps of genetic changes leading to tumor progression, including invasiveness.
文摘To estimate the antioxidant activities of Peanut polypeptides （PPs） by using a chemiluminescence （CL） method in vitro. The scavenging ability of PPs on superoxide anion, hydroxide radical, and hydrogen peroxide was determined by the Pyrogallol-Luminol system, the CuSO4-Phen-Vc-H2O2 system, and the luminol-H2O2 system, respectively. DNA damage preventing the effect of PPs was determined by the CuSO4-Phen-Vc-H2O2-DNA CL system. The results shows that PPs had good effect on the scavenging ability of superoxide anion （IC50=9.68±0.12 mg/ml）. PPs could scavenge hydroxide radical effectively （the IC50 value was 46.06±0.08 μg/ml）. PPs had a good scavenging ability on hydrogen peroxide, which had a relatively low IC50 value （0.17±0.07 mg/ml）. PPs （the IC50 value was0.72±0.11 mg/ml） were powerful on the DNA damage preventing effect. PPs possesses a good scavenging potency on ROS in different systems, but different results exist in different systems.
