目的:观察七龙天对低氧性肺动脉高压(HPH)大鼠内皮素-1(ET-1)、血管内皮细胞一氧化氮合成酶(NOS)的影响。方法:雄性SD大鼠随机分为6组:空白对照组(A)、模型组(B)、波生坦组(C)、七龙天低剂量组(D)、七龙天中剂量组(E)、七龙天高剂量组(F...目的:观察七龙天对低氧性肺动脉高压(HPH)大鼠内皮素-1(ET-1)、血管内皮细胞一氧化氮合成酶(NOS)的影响。方法:雄性SD大鼠随机分为6组:空白对照组(A)、模型组(B)、波生坦组(C)、七龙天低剂量组(D)、七龙天中剂量组(E)、七龙天高剂量组(F)。A组大鼠置于正常环境中饲养,B、C、D、E、F组均造模。采用常压低氧法制模,从制模第1天始给药,连续3周,A、B两组均给予蒸馏水3 m L/(只·d)。在直视下行右心导管术测定肺血流动力学参数,及RT-PCR法检测肺组织中NOS、ET-1 mRNA表达。结果:七龙天及波生坦均可明显降低大鼠肺动脉高压,且以七龙天高剂量组效果为佳,疗效呈药物剂量依赖表现。各组NOS、ET-1表达量与肺动脉压具有相关性,但二者在高剂量七龙天调节至正常范围时,肺动脉压仍未恢复正常水平。结论:不同剂量七龙天均可降低肺动脉高压,且高剂量七龙天疗效优于波生坦。其降压机制与降低NOS及ET-1表达量有关,但仍可能受其他炎症因子及血管新生因子影响。展开更多
Current glacier recession under the global warming has aroused world-wide attention.Initiated from 1958,the observations show that over the past 50 years,the glacier has changed remarkably in the aspects of snow-firn ...Current glacier recession under the global warming has aroused world-wide attention.Initiated from 1958,the observations show that over the past 50 years,the glacier has changed remarkably in the aspects of snow-firn stratigraphy,ice formation zone,ice temperature,area and terminus position,etc.These changes are apparently the results of temperature rise in this area.The glacier recession continued throughout the entire observed time period,and showed an accelerated tendency since 1985.Meltwater runoff also increased 84.2% over the last 20 years.展开更多
文摘目的:观察七龙天对低氧性肺动脉高压(HPH)大鼠内皮素-1(ET-1)、血管内皮细胞一氧化氮合成酶(NOS)的影响。方法:雄性SD大鼠随机分为6组:空白对照组(A)、模型组(B)、波生坦组(C)、七龙天低剂量组(D)、七龙天中剂量组(E)、七龙天高剂量组(F)。A组大鼠置于正常环境中饲养,B、C、D、E、F组均造模。采用常压低氧法制模,从制模第1天始给药,连续3周,A、B两组均给予蒸馏水3 m L/(只·d)。在直视下行右心导管术测定肺血流动力学参数,及RT-PCR法检测肺组织中NOS、ET-1 mRNA表达。结果:七龙天及波生坦均可明显降低大鼠肺动脉高压,且以七龙天高剂量组效果为佳,疗效呈药物剂量依赖表现。各组NOS、ET-1表达量与肺动脉压具有相关性,但二者在高剂量七龙天调节至正常范围时,肺动脉压仍未恢复正常水平。结论:不同剂量七龙天均可降低肺动脉高压,且高剂量七龙天疗效优于波生坦。其降压机制与降低NOS及ET-1表达量有关,但仍可能受其他炎症因子及血管新生因子影响。
基金This research was supported by the Knowledge Innovation Project of the Chinese Academy of Sciences(KZCX2-YW-127)and the National Natural Science Foundation of China(40631001,40571033,40371028,J0630966).
文摘Current glacier recession under the global warming has aroused world-wide attention.Initiated from 1958,the observations show that over the past 50 years,the glacier has changed remarkably in the aspects of snow-firn stratigraphy,ice formation zone,ice temperature,area and terminus position,etc.These changes are apparently the results of temperature rise in this area.The glacier recession continued throughout the entire observed time period,and showed an accelerated tendency since 1985.Meltwater runoff also increased 84.2% over the last 20 years.
