[Objective] Effects of nitrogen amount and nitrogen form on 1-deoxynojimycin(DNJ)content in mulberry leaf was explored in order to provide a reference for improving DNJ content in mulberry leaf and its medicinal val...[Objective] Effects of nitrogen amount and nitrogen form on 1-deoxynojimycin(DNJ)content in mulberry leaf was explored in order to provide a reference for improving DNJ content in mulberry leaf and its medicinal value.[Method] Effects of nitrogen amount(NO-3-N and NH+4-N)and nitrogen form(NO-3-N/NH+4-N)on DNJ content in mulberry leaf were studied by changing nitrogen amount and nitrogen form in water culture solution.[Result] DNJ contents in mulberry leaf both increased at first and then decreased with the increase of nitrogen amount,furthermore compared with NH+4-N,NO-3-N was more beneficial to the accumulation of DNJ;DNJ content in mulberry leaf obviously increased at first and then decreased with the decrease of NO-3-N/NH+4-N,among them when its rate was 25/75,DNJ content reached the highest.[Conclusion] Proper nitrogen amount and nitrogen form could effectively improve the DNJ content in mulberry leaf.展开更多
背景:程序性细胞死亡受体1(programmed death receptor-1,PD-1)在高糖环境下影响骨髓间充质干细胞成骨分化的作用机制尚不清楚。目的:探讨高糖环境中PD-1对大鼠骨髓间充质干细胞成骨分化的影响及其调控机制。方法:将大鼠骨髓间充质干细...背景:程序性细胞死亡受体1(programmed death receptor-1,PD-1)在高糖环境下影响骨髓间充质干细胞成骨分化的作用机制尚不清楚。目的:探讨高糖环境中PD-1对大鼠骨髓间充质干细胞成骨分化的影响及其调控机制。方法:将大鼠骨髓间充质干细胞随机分为正常糖组(5.6 mmol/L)、高糖组(30 mmol/L)、PD-1过表达组、PD-1过表达空载组、PD-1敲低组、PD-1敲低空载组、PI3K/AKT通路抑制剂组(PD-1敲低+5μmol/L LY294002)。通过在高糖培养基中培养大鼠骨髓间充质干细胞来模拟体外糖尿病环境,采用qRT-PCR检测大鼠骨髓间充质干细胞中PD-1及其配体PD-L1和成骨标志物Runx2、OSX的mRNA表达,采用碱性磷酸酶染色和茜素红S染色观察成骨分化能力,采用CCK-8检测细胞增殖情况,采用Western blot检测PD-1、PD-L1、p-PI3K、p-AKT的蛋白表达。结果与结论:①高糖组PD-1及PD-L1表达显著高于正常糖组,高糖组骨髓间充质干细胞的成骨分化能力较正常糖组显著下降;②敲低PD-1表达可以促进骨髓间充质干细胞的成骨分化、增加细胞增殖活性,同时激活PI3K/AKT通路;③加入PI3K/AKT通路抑制剂LY294002后,骨髓间充质干细胞成骨分化能力显著下降。结果表明:PD-1依赖于PI3K/AKT信号通路抑制高糖环境下大鼠骨髓间充质干细胞的成骨分化。展开更多
基金Supported by Key Technology Innovation Project of Sichuan Province(2008NC00365)~~
文摘[Objective] Effects of nitrogen amount and nitrogen form on 1-deoxynojimycin(DNJ)content in mulberry leaf was explored in order to provide a reference for improving DNJ content in mulberry leaf and its medicinal value.[Method] Effects of nitrogen amount(NO-3-N and NH+4-N)and nitrogen form(NO-3-N/NH+4-N)on DNJ content in mulberry leaf were studied by changing nitrogen amount and nitrogen form in water culture solution.[Result] DNJ contents in mulberry leaf both increased at first and then decreased with the increase of nitrogen amount,furthermore compared with NH+4-N,NO-3-N was more beneficial to the accumulation of DNJ;DNJ content in mulberry leaf obviously increased at first and then decreased with the decrease of NO-3-N/NH+4-N,among them when its rate was 25/75,DNJ content reached the highest.[Conclusion] Proper nitrogen amount and nitrogen form could effectively improve the DNJ content in mulberry leaf.