In the present study, the effect of manganese（Mn） on antioxidant status and the expression of the manganese superoxide dismutase（MnSOD） gene in cultured primary myocardial cells collected from the chick embryos wa...In the present study, the effect of manganese（Mn） on antioxidant status and the expression of the manganese superoxide dismutase（MnSOD） gene in cultured primary myocardial cells collected from the chick embryos was investigated. The hypothesis that Mn supplementation would enhance the expression of MnSOD in cultured primary myocardial cells of chick embryos was tested. Eggs collected from Mn-depleted Arbor Acres laying breeder hens were incubated for 10 days and then myocardial cells were isolated and cultivated for 8 days. The embryonic myocardial cells on day 6 were treated with Mn in the cell culture medium at different time points when the proportion of cells showing spontaneous contraction was over 95% after the 3-day primary culture. A completely randomized design involving a 3 Mn levels（0, 0.5 and 1.0 mmol L^（-1））×3 incubation time points（12, 24 and 48 h） factorial arrangement of treatments（n=6） was used in the current experiment. The results showed that MnSOD activity and m RNA expression level were induced by Mn and increased with incubation time, which supported the hypothesis that Mn would enhance the expression of the MnSOD gene, and thus might protect myocardial cells from oxidative stress during the chick embryonic development.展开更多
目的:分析不同浓度重组myocilin蛋白对体外培养的原发性开角型青光眼(primary open angle glaucoma,POAG)患者小梁网细胞纤维连接蛋白(fibronectin,FN)表达及对黏附功能的影响。方法:体外培养POAG患者小梁网细胞,分别加入含重组myocili...目的:分析不同浓度重组myocilin蛋白对体外培养的原发性开角型青光眼(primary open angle glaucoma,POAG)患者小梁网细胞纤维连接蛋白(fibronectin,FN)表达及对黏附功能的影响。方法:体外培养POAG患者小梁网细胞,分别加入含重组myocilin蛋白终浓度为0(对照组)、0.5、1、1.5、2、2.5μg/mL的无血清培养基,运用Western blot、ELISA法分别检测小梁网细胞内和细胞培养液中FN的表达水平;并运用CCK-8法检测myocilin蛋白对POAG小梁网细胞黏附的影响。结果:Western blot检测结果:FN/β-actin比值分别为34.8±0.6、33.4±1.0、28.9±0.8、21.6±0.9、15.9±1.1、11.9±0.8;0.5μg/mL组与对照组相比,差异无统计学意义(P=0.092);1.0、1.5、2、2.5μg/mL组与对照组比较,差异有统计学意义(F=346.131,P<0.05)。ELISA法检测各组细胞培养液中FN浓度为:0.4654±0.0039、0.4596±0.0032、0.4216±0.0037、0.4214±0.0039、0.4043±0.0039、0.3806±0.0071μg/mL;0.5μg/mL组与对照组相比,差异无统计学意义(P=0.120);1.0、1.5、2、2.5μg/mL组与对照组比较,差异有统计学意义(F=176.054,P<0.05)。运用CCK-8法检测各组细胞吸光度均值分别为1.98140.1624、1.8848±0.0267、1.4895±0.0916、1.4120±0.1087、1.3392±0.1391、1.0310±0.0639;0.5μg/mL组与对照组相比,差异无统计学意义(P=0.300);1、1.5、2、2.5μg/mL组与对照组相比,差异有统计学意义(F=177.818,P<0.05)。结论:Myocilin蛋白能抑制POAG小梁网细胞FN的表达,并呈现一定的剂量依赖性;myocilin蛋白可降低POAG小梁网细胞的黏附能力。展开更多
基金supported by the Key International Cooperation Program of the National Natural Science Foundation of China (31110103916)the National Natural Science Foundation of China (31272465)+1 种基金the Agricultural Science and Technology Innovation Program,China (ASTIP-IAS08)the China Agriculture Research System (CARS-42)
文摘In the present study, the effect of manganese（Mn） on antioxidant status and the expression of the manganese superoxide dismutase（MnSOD） gene in cultured primary myocardial cells collected from the chick embryos was investigated. The hypothesis that Mn supplementation would enhance the expression of MnSOD in cultured primary myocardial cells of chick embryos was tested. Eggs collected from Mn-depleted Arbor Acres laying breeder hens were incubated for 10 days and then myocardial cells were isolated and cultivated for 8 days. The embryonic myocardial cells on day 6 were treated with Mn in the cell culture medium at different time points when the proportion of cells showing spontaneous contraction was over 95% after the 3-day primary culture. A completely randomized design involving a 3 Mn levels（0, 0.5 and 1.0 mmol L^（-1））×3 incubation time points（12, 24 and 48 h） factorial arrangement of treatments（n=6） was used in the current experiment. The results showed that MnSOD activity and m RNA expression level were induced by Mn and increased with incubation time, which supported the hypothesis that Mn would enhance the expression of the MnSOD gene, and thus might protect myocardial cells from oxidative stress during the chick embryonic development.
