幽门螺杆菌对SGC-7901细胞增殖凋亡及p27kipl表达的影响

Objective To explore the influence of Helicobacter pylori (Hp) on the proliferation, apoptosis and expression of p27kipl protein of gastric epithelial cells in vitro. Methods SC, C-7901 cell pro-liferation was examined by flow cytometry after incubation with different concentration of NCTC11637. The effect of NCTC11637 on cell apoptosis was also evaluated by flow cytometryo And the expression of p27kipl of gastric epithelial cells was detected by immunohistochemical analysis and in situ hybridization, respectively. Results Cell proliferation was enhanced when co-incubated with the Hp in low concentration (3.4 x 104 to 1.9 x 105 CFU/ml) but inhibited in higher concentration (≥4.8×106CFU/ml). However, cell apoptosis was increase when co-incubated with the Hp in high concentration (≥9.6 ×105 CFU/ml) showing concen-tration dependent picture. In addition, the co-incubation of SGC-7901 with Hp led to decrease of the expres-sion of p27kipl protein but not mRNA in a Hp concentration dependent way. Conclusion Hp could effect the gastric epithelial cells apoptosis and proliferation directly and influence the expression of p27kips protein which might facilitate gastric carcinoma.     

布鲁氏菌分种分型研究进展

布鲁氏菌的分型技术有表型技术和基因型技术两种,其中表型技术主要是利用生物分型,噬菌体和细菌素分型,血清分型,药物敏感分型,细菌菌体组分分型;基因型技术主要是利用限制性片段长度多态性分型,PCR及其衍生物技术分型,DNA同源性和染色体大小分型。但没有一种方法能完全反映布鲁氏菌的进化关系和分类地位,在临床和流行病学上又具有现实意义,寻找一种更好的分型方法或者是多种方法的联合运用,可能会更好地解决布鲁氏菌的分种分型问题。     

幽门螺杆菌对SGC-7901细胞增殖凋亡及p27kipl表达的影响

Objective To explore the influence of Helicobacter pylori (Hp) on the proliferation, apoptosis and expression of p27kipl protein of gastric epithelial cells in vitro. Methods SC, C-7901 cell pro-liferation was examined by flow cytometry after incubation with different concentration of NCTC11637. The effect of NCTC11637 on cell apoptosis was also evaluated by flow cytometryo And the expression of p27kipl of gastric epithelial cells was detected by immunohistochemical analysis and in situ hybridization, respectively. Results Cell proliferation was enhanced when co-incubated with the Hp in low concentration (3.4 x 104 to 1.9 x 105 CFU/ml) but inhibited in higher concentration (≥4.8×106CFU/ml). However, cell apoptosis was increase when co-incubated with the Hp in high concentration (≥9.6 ×105 CFU/ml) showing concen-tration dependent picture. In addition, the co-incubation of SGC-7901 with Hp led to decrease of the expres-sion of p27kipl protein but not mRNA in a Hp concentration dependent way. Conclusion Hp could effect the gastric epithelial cells apoptosis and proliferation directly and influence the expression of p27kips protein which might facilitate gastric carcinoma.     

幽门螺杆菌对SGC-7901细胞增殖凋亡及p27kipl表达的影响

Objective To explore the influence of Helicobacter pylori (Hp) on the proliferation, apoptosis and expression of p27kipl protein of gastric epithelial cells in vitro. Methods SC, C-7901 cell pro-liferation was examined by flow cytometry after incubation with different concentration of NCTC11637. The effect of NCTC11637 on cell apoptosis was also evaluated by flow cytometryo And the expression of p27kipl of gastric epithelial cells was detected by immunohistochemical analysis and in situ hybridization, respectively. Results Cell proliferation was enhanced when co-incubated with the Hp in low concentration (3.4 x 104 to 1.9 x 105 CFU/ml) but inhibited in higher concentration (≥4.8×106CFU/ml). However, cell apoptosis was increase when co-incubated with the Hp in high concentration (≥9.6 ×105 CFU/ml) showing concen-tration dependent picture. In addition, the co-incubation of SGC-7901 with Hp led to decrease of the expres-sion of p27kipl protein but not mRNA in a Hp concentration dependent way. Conclusion Hp could effect the gastric epithelial cells apoptosis and proliferation directly and influence the expression of p27kips protein which might facilitate gastric carcinoma.     

幽门螺杆菌对SGC-7901细胞增殖凋亡及p27kipl表达的影响

Objective To explore the influence of Helicobacter pylori (Hp) on the proliferation, apoptosis and expression of p27kipl protein of gastric epithelial cells in vitro. Methods SC, C-7901 cell pro-liferation was examined by flow cytometry after incubation with different concentration of NCTC11637. The effect of NCTC11637 on cell apoptosis was also evaluated by flow cytometryo And the expression of p27kipl of gastric epithelial cells was detected by immunohistochemical analysis and in situ hybridization, respectively. Results Cell proliferation was enhanced when co-incubated with the Hp in low concentration (3.4 x 104 to 1.9 x 105 CFU/ml) but inhibited in higher concentration (≥4.8×106CFU/ml). However, cell apoptosis was increase when co-incubated with the Hp in high concentration (≥9.6 ×105 CFU/ml) showing concen-tration dependent picture. In addition, the co-incubation of SGC-7901 with Hp led to decrease of the expres-sion of p27kipl protein but not mRNA in a Hp concentration dependent way. Conclusion Hp could effect the gastric epithelial cells apoptosis and proliferation directly and influence the expression of p27kips protein which might facilitate gastric carcinoma.     

幽门螺杆菌对SGC-7901细胞增殖凋亡及p27kipl表达的影响

目的 探讨幽门螺杆菌(Helicobacterpriori,Hp)对感染细胞增殖凋亡及细胞周期蛋白抑制因子p27kipl表达的影响.方法 不同浓度Hp国际标准株NCTC11637分别感染胃上皮细胞株SGC-7901,测定p27kipl蛋白及mRNA的表达、细胞增殖指数和凋亡率.结果 (1)Hp在3.4×104～1.9×105CFUml浓度时,SGC-7901的增殖指数随Hp浓度增高而显著增高,而在Hp≥14.8×106CFU/ml时明显降低;(2)Hp≥9.6×105CFU/ml时,细胞凋亡率呈浓度依赖性显著增高(P<0.01);(3)细胞p27kiplmRNA表达阳性率元显著变化,而p27kipl蛋白表达阳性率呈Hp浓度依赖性显著降低(P<0.05),与细胞凋亡率呈负相关.结论 Hp感染可直接导致胃上皮细胞增殖与凋亡的紊乱,影响细胞周期调控蛋白p27kipl的表达.     

幽门螺杆菌对胃上皮细胞凋亡及p27^kip1表达的影响

凋亡是一种基因调控的程序性细胞死亡,正常情况下它与增殖一起维持人体细胞总数的相对恒定。细胞周期调控点是将细胞增殖和凋亡连在一起的枢纽,是控制细胞增殖与凋亡的双向开关。p27^kip1（p^27-kinase inhibition protein 1）基因是Polyka等于1994年发现的新的CKI基因．具有限制性调节细胞周期进程的作用.     

幽门螺杆菌感染与胃黏膜上皮细胞转化生长因子β1表达的关系

目的为证实幽门螺杆菌(H.pylori)通过诱导胃黏膜上皮细胞表达转化生长因子β1(TGF-β1)抑制机体免疫功能,参与H.pylori免疫逃逸提供依据。方法选用1.0×109CFU/ml(低浓度),4.0×109CFU/ml(中浓度),8.0×109CFU/ml(高浓度)H.pylori国际标准毒力菌株NCTC11637菌悬液分别感染体外培养胃黏膜上皮细胞,建立不同共孵育时间(0、0.5、1、1.5、2、4、8、12h)H.pylori体外感染细胞模型,以不加H.pylori的胃黏膜上皮细胞为对照组,用酶联免疫吸附试验(ELISA)法测定感染细胞培养上清TGF-β1含量;以4.0×109CFU/ml灭活菌株菌悬液与胃黏膜上皮细胞共孵育,同法检测感染细胞2、12h培养上清TGF-β1含量。结果不同浓度时间组H.pylori诱导产生TGF-β1的量均较对照组显著增高(P<0.01);各浓度时间组TGF-β1分泌有相似的动态趋势,但尤以中浓度组表达量最高;H.pylori灭活菌株与活菌诱导TGF-β1的表达差异无统计学意义(P>0.05)。结论H.py-lori可能具有诱导胃黏膜上皮细胞分泌TGF-β1的菌体成分,当H.pylori感染人胃黏膜细胞后,其菌体成分通过诱导胃黏膜细胞TGF-β1的表达,抑制机体免疫功能,导致H.pylori免疫逃逸,参与其H.pylori致病过程。     

提高医学微生物学实验课教学质量的思考

医学微生物学是一门理论与实践紧密结合的课程,为使学生更多地获得实验操作技能和理论知识,并培养他们的创新能力和科学素养,就如何提高医学微生物学实验课的教学质量进行新教学方式的探讨。     

幽门螺杆菌对SGC-7901细胞增殖凋亡及p27kipl表达的影响

Objective To explore the influence of Helicobacter pylori (Hp) on the proliferation, apoptosis and expression of p27kipl protein of gastric epithelial cells in vitro. Methods SC, C-7901 cell pro-liferation was examined by flow cytometry after incubation with different concentration of NCTC11637. The effect of NCTC11637 on cell apoptosis was also evaluated by flow cytometryo And the expression of p27kipl of gastric epithelial cells was detected by immunohistochemical analysis and in situ hybridization, respectively. Results Cell proliferation was enhanced when co-incubated with the Hp in low concentration (3.4 x 104 to 1.9 x 105 CFU/ml) but inhibited in higher concentration (≥4.8×106CFU/ml). However, cell apoptosis was increase when co-incubated with the Hp in high concentration (≥9.6 ×105 CFU/ml) showing concen-tration dependent picture. In addition, the co-incubation of SGC-7901 with Hp led to decrease of the expres-sion of p27kipl protein but not mRNA in a Hp concentration dependent way. Conclusion Hp could effect the gastric epithelial cells apoptosis and proliferation directly and influence the expression of p27kips protein which might facilitate gastric carcinoma.