目的研究模拟微重力环境对人角质细胞(HaCaT细胞)创伤修复相关蛋白和基因表达的影响。方法应用RCCS系统进行模拟微重力细胞培养实验,将HaCaT细胞随机分为模拟微重力(SMG)组和正常重力对照(NG)组,培养32、36和42 h后分别收集细胞,检测热...目的研究模拟微重力环境对人角质细胞(HaCaT细胞)创伤修复相关蛋白和基因表达的影响。方法应用RCCS系统进行模拟微重力细胞培养实验,将HaCaT细胞随机分为模拟微重力(SMG)组和正常重力对照(NG)组,培养32、36和42 h后分别收集细胞,检测热休克蛋白70(HSP70)、基质金属蛋白酶-9(MMP-9)和Caspase-3的mRNA及蛋白表达水平变化,透射电镜观察2组培养42 h后细胞超微结构变化。结果SMG组HaCaT细胞培养32、36 h HSP70 mRNA表达量,培养32、36和42 h MMP-9 mRNA及培养36 h Caspase-3 mRNA表达水平均高于NG组(P<0.05)。蛋白免疫印迹法检测结果显示,HaCaT细胞经微重力培养32、36和42 h后HSP70和MMP-9蛋白表达趋势与相应蛋白mRNA表达一致,而Caspase-3蛋白表达趋势与相应mRNA表达存在一定差异。透射电镜观察发现,模拟微重力环境下培养42 h后的HaCaT细胞出现皱缩表现,线粒体嵴出现断裂,结构模糊,部分线粒体出现空泡。结论模拟微重力环境下HaCaT细胞HSP70、MMP-9及Caspase-3表达水平上调,细胞超微结构发生明显病理性改变。展开更多
Climate change resulted in changes in crop growth duration and planting structure, northward movement of planting region, and more severe plant diseases and insect pests in Northwest China. It caused earlier seeding f...Climate change resulted in changes in crop growth duration and planting structure, northward movement of planting region, and more severe plant diseases and insect pests in Northwest China. It caused earlier seeding for spring crop, later seeding for autumn crop, accelerated crop growth, and reduced mortality for winter crop. To adapt to climate change, measures such as optimization of agricultural arrangement, adjustment of planting structure, expansion of thermophilic crops, and development of water-saving grassland and livestock were enhanced. agriculture have been taken. Damaging The deterioration trend of grassland was consequences of imbalance between intensified; both grass quantity and quality declined. With overgrazing, proportions of inferior grass, weeds and poisonous weeds increased in plateau pastoral areas. Returning farmland to grazing, returning grazing to grassland, fence enclosure and artificial grassland construction have been implemented to restore the grassland vegetation, to increase the grassland coverage, to reasonably control the livestock carrying capacity, to prevent overgrazing, to keep balance between grassland and livestock, and to develop the ecological animal husbandry. In Northwest China, because the amount of regional water resources had an overall decreasing trend, there was a continuous expansion in the regional land desertification, and soil erosion was very serious. A series of measures, such as development of artificial precipitation （snow）, water resources control, regional water diversion, water storage project and so on, were used effectively to respond to water deficit. It had played a certain role in controlling soil erosion by natural forest protection and returning farmland to forest and grassland. In the early 21st century, noticeable achievements had been made in prevention and control of desertification in Northwest China. The regional ecological environment has been improved obviously, and the desertification trend has shown sign of under control.展开更多
文摘目的研究模拟微重力环境对人角质细胞(HaCaT细胞)创伤修复相关蛋白和基因表达的影响。方法应用RCCS系统进行模拟微重力细胞培养实验,将HaCaT细胞随机分为模拟微重力(SMG)组和正常重力对照(NG)组,培养32、36和42 h后分别收集细胞,检测热休克蛋白70(HSP70)、基质金属蛋白酶-9(MMP-9)和Caspase-3的mRNA及蛋白表达水平变化,透射电镜观察2组培养42 h后细胞超微结构变化。结果SMG组HaCaT细胞培养32、36 h HSP70 mRNA表达量,培养32、36和42 h MMP-9 mRNA及培养36 h Caspase-3 mRNA表达水平均高于NG组(P<0.05)。蛋白免疫印迹法检测结果显示,HaCaT细胞经微重力培养32、36和42 h后HSP70和MMP-9蛋白表达趋势与相应蛋白mRNA表达一致,而Caspase-3蛋白表达趋势与相应mRNA表达存在一定差异。透射电镜观察发现,模拟微重力环境下培养42 h后的HaCaT细胞出现皱缩表现,线粒体嵴出现断裂,结构模糊,部分线粒体出现空泡。结论模拟微重力环境下HaCaT细胞HSP70、MMP-9及Caspase-3表达水平上调,细胞超微结构发生明显病理性改变。
基金supported by the Special Climate Change Research Program of China Meteorological Administration(No.CCSF2010-5)
文摘Climate change resulted in changes in crop growth duration and planting structure, northward movement of planting region, and more severe plant diseases and insect pests in Northwest China. It caused earlier seeding for spring crop, later seeding for autumn crop, accelerated crop growth, and reduced mortality for winter crop. To adapt to climate change, measures such as optimization of agricultural arrangement, adjustment of planting structure, expansion of thermophilic crops, and development of water-saving grassland and livestock were enhanced. agriculture have been taken. Damaging The deterioration trend of grassland was consequences of imbalance between intensified; both grass quantity and quality declined. With overgrazing, proportions of inferior grass, weeds and poisonous weeds increased in plateau pastoral areas. Returning farmland to grazing, returning grazing to grassland, fence enclosure and artificial grassland construction have been implemented to restore the grassland vegetation, to increase the grassland coverage, to reasonably control the livestock carrying capacity, to prevent overgrazing, to keep balance between grassland and livestock, and to develop the ecological animal husbandry. In Northwest China, because the amount of regional water resources had an overall decreasing trend, there was a continuous expansion in the regional land desertification, and soil erosion was very serious. A series of measures, such as development of artificial precipitation （snow）, water resources control, regional water diversion, water storage project and so on, were used effectively to respond to water deficit. It had played a certain role in controlling soil erosion by natural forest protection and returning farmland to forest and grassland. In the early 21st century, noticeable achievements had been made in prevention and control of desertification in Northwest China. The regional ecological environment has been improved obviously, and the desertification trend has shown sign of under control.
