Cardiovascular disease, nervous system disorders, and cancer in association with other diseases such as diabetes mellitus result in greater than sixty percent of the global annual deaths. These noncommunicable disease...Cardiovascular disease, nervous system disorders, and cancer in association with other diseases such as diabetes mellitus result in greater than sixty percent of the global annual deaths. These noncommunicable diseases also affect at least one-third of the population in low and middle-income countries and lead to hypertension, elevated cholesterol, malignancy, and neurodegenerative disorders such as Alzheimer's disease and stroke. With the climbing lifespan of the world's population, increased prevalence of these disorders is expected requiring the development of new therapeutic strategies against these disabling disease entities. Targeting stem cellproliferation for cardiac disease, vascular disorders, cancer, and neurodegenerative disorders is receiving great enthusiasm, especially those that focus upon SIRT1, a mammalian homologue of the yeast silent information regulator-2. Modulation of the cellular activity of SIRT1 can involve oversight by nicotinamide/nicotinic acid mononucleotide adenylyltransferase, mammalian forkhead transcription factors, mechanistic of rapamycin pathways, and cysteine-rich protein 61, connective tissue growth factor, and nephroblastoma over-expressed gene family members that can impact cytoprotective outcomes. Ultimately, the ability of SIRT1 to control the programmed cell death pathways of apoptosis and autophagy can determine not only cardiac, vascular, and neuronal stem cell development and longevity, but also the onset of tumorigenesis and the resistance against chemotherapy. SIRT1 therefore has a critical role and holds exciting prospects for new therapeutic strategies that can offer reparative processes for cardiac, vascular, and nervous system degenerative disorders as well as targeted control of aberrant cell growth during cancer.展开更多
SIRT1基因对细胞的生存、衰老、凋亡等生理活动起着十分重要的调节作用。为了建立荧光定量PCR技术检测猪SIRT1基因表达量,根据GenBank中猪SIRT1 mRNA序列设计引物,建立基于SYBR Green I染料技术的荧光定量PCR检测方法。结果表明,所建立...SIRT1基因对细胞的生存、衰老、凋亡等生理活动起着十分重要的调节作用。为了建立荧光定量PCR技术检测猪SIRT1基因表达量,根据GenBank中猪SIRT1 mRNA序列设计引物,建立基于SYBR Green I染料技术的荧光定量PCR检测方法。结果表明,所建立的荧光定量PCR检测方法具有快速、敏感和特异性强等特点,为猪SIRT1基因定量分析提供了技术平台。展开更多
本实验旨在研究沉默信息调节因子1(SIRT1)对牛卵泡颗粒细胞凋亡及雌激素分泌的影响。构建SIRT1基因干扰载体,并转染体外培养的颗粒细胞。实验分为转染SIRT1-sh RNA的干扰组、转染NC-sh RNA的对照组和未转染的空白组,每组设3个重复。流...本实验旨在研究沉默信息调节因子1(SIRT1)对牛卵泡颗粒细胞凋亡及雌激素分泌的影响。构建SIRT1基因干扰载体,并转染体外培养的颗粒细胞。实验分为转染SIRT1-sh RNA的干扰组、转染NC-sh RNA的对照组和未转染的空白组,每组设3个重复。流式细胞术检测细胞凋亡;实时荧光定量PCR检测细胞内Bax、Bcl-2 m RNA表达;Western Blot检测细胞内Bax、Bcl-2蛋白表达;ELISA试剂盒检测雌激素水平。结果表明:干扰组颗粒细胞SIRT1 m RNA表达量显著低于对照组与空白组(P<0.05),而对照组与空白组之间差异不显著(P>0.05);干扰组颗粒细胞凋亡率显著低于对照组与空白组(P<0.05);干扰组颗粒细胞Bax m RNA和蛋白质表达显著低于对照组与空白组(P<0.05),而Bcl-2 m RNA和蛋白质表达均显著高于对照组与空白组(P<0.05);干扰组颗粒细胞培养液中雌激素含量显著低于对照组与空白组(P<0.05)。SIRT1基因可以促进牛卵泡颗粒细胞的凋亡,并促进雌激素分泌。展开更多
目的通过研究沉默信息调节因子1(SIRT1)基因敲除对骨关节炎小鼠VEGF/AKT通路的作用,探讨骨关节炎关节软骨退变的可能机制。方法将小鼠分为两组:SIRT1^(+/+)小鼠骨关节炎模型组(A组,n=6);SIRT1^(-/-)小鼠骨关节炎模型组(B组,n=6)。荧光...目的通过研究沉默信息调节因子1(SIRT1)基因敲除对骨关节炎小鼠VEGF/AKT通路的作用,探讨骨关节炎关节软骨退变的可能机制。方法将小鼠分为两组:SIRT1^(+/+)小鼠骨关节炎模型组(A组,n=6);SIRT1^(-/-)小鼠骨关节炎模型组(B组,n=6)。荧光定量聚合酶链反应检测SIRT1基因表达情况;HE染色、番红O-固绿双染色观察膝关节软骨形态结构改变,Mankin评分评价膝关节关节软骨退变,免疫组化染色检测膝关节软骨细胞中SIRT1、VEGF和AKT蛋白水平。结果 B组SIRT1 m RNA表达量为2.24417±1.316569,明显低于A组(P<0.01)。HE染色和番红O-固绿双染色结果显示,B组膝关节关节软骨退变明显,Mankin评分分值为9.8333±1.94079分,明显高于A组(P<0.05),B组SIRT1、VEGF和AKT免疫组化染色积分分别为3.3333±1.96638、10.0000±2.44949和1.3333±1.21106,B组SIRT1蛋白表达与A组相比差异不显著(P>0.05);B组VEGF蛋白表达明显高于A组(P<0.05);B组AKT蛋白表达明显低于A组(P<0.01)。结论 SIRT1基因敲除可能通过激活VEGF/AKT通路加重骨关节炎关节软骨的退变,因此SIRT1基因可能对骨关节炎起到保护作用。展开更多
【目的】探讨沉默信息调节因子1(Silent information regulator1,SIRT1)对牛卵泡颗粒细胞增殖及细胞周期的影响。【方法】选取牛卵巢上直径2～6mm的卵泡,用注射器抽取卵泡中的颗粒细胞,进行体外培养。根据牛SIRT1基因的核苷酸序列,构建...【目的】探讨沉默信息调节因子1(Silent information regulator1,SIRT1)对牛卵泡颗粒细胞增殖及细胞周期的影响。【方法】选取牛卵巢上直径2～6mm的卵泡,用注射器抽取卵泡中的颗粒细胞,进行体外培养。根据牛SIRT1基因的核苷酸序列,构建了4条干扰载体(shRNA-SIRT1-1597、shRNA-SIRT1-1471、shRNA-SIRT1-1186、shRNA-SIRT1-1306)及1条阴性对照载体(shRNA-NC),利用脂质体将质粒转入牛卵泡颗粒细胞,通过实时荧光定量PCR法筛选出干扰效果最佳的干扰载体用于后续试验。以转染shRNA-SIRT1-1471的颗粒细胞为干扰组,转染sh-RNA-NC的颗粒细胞为阴性对照组,不做处理的颗粒细胞为空白对照组,采用CCK-8法检测转染后24,36,48和60h各组颗粒细胞增殖情况,用流式细胞术检测转染后24,36和48h各组颗粒细胞的细胞周期变化情况。【结果】转染后48hshRNA-SIRT1-1471干扰的颗粒细胞SIRT1表达量显著低于其他处理组(P<0.05),故选用shRNA-SIRT1-1471作为最佳干扰载体。转染后24,36,48和60h,干扰组颗粒细胞增殖效果显著高于空白对照组和阴性对照组(P<0.05);转染后24～48h干扰组与空白对照组和阴性对照组相比G1期细胞比例显著降低,S期细胞比例显著升高,从而使更多细胞进入M期进行正常的有丝分裂,促进细胞增殖。【结论】SIRT1能抑制牛卵泡颗粒细胞的增殖,并阻滞细胞周期的进程。展开更多
基金American Diabetes AssociationAmerican Heart Association+3 种基金NIH NIEHSNIH NIANIH NINDSNIH ARRA
文摘Cardiovascular disease, nervous system disorders, and cancer in association with other diseases such as diabetes mellitus result in greater than sixty percent of the global annual deaths. These noncommunicable diseases also affect at least one-third of the population in low and middle-income countries and lead to hypertension, elevated cholesterol, malignancy, and neurodegenerative disorders such as Alzheimer's disease and stroke. With the climbing lifespan of the world's population, increased prevalence of these disorders is expected requiring the development of new therapeutic strategies against these disabling disease entities. Targeting stem cellproliferation for cardiac disease, vascular disorders, cancer, and neurodegenerative disorders is receiving great enthusiasm, especially those that focus upon SIRT1, a mammalian homologue of the yeast silent information regulator-2. Modulation of the cellular activity of SIRT1 can involve oversight by nicotinamide/nicotinic acid mononucleotide adenylyltransferase, mammalian forkhead transcription factors, mechanistic of rapamycin pathways, and cysteine-rich protein 61, connective tissue growth factor, and nephroblastoma over-expressed gene family members that can impact cytoprotective outcomes. Ultimately, the ability of SIRT1 to control the programmed cell death pathways of apoptosis and autophagy can determine not only cardiac, vascular, and neuronal stem cell development and longevity, but also the onset of tumorigenesis and the resistance against chemotherapy. SIRT1 therefore has a critical role and holds exciting prospects for new therapeutic strategies that can offer reparative processes for cardiac, vascular, and nervous system degenerative disorders as well as targeted control of aberrant cell growth during cancer.
文摘SIRT1基因对细胞的生存、衰老、凋亡等生理活动起着十分重要的调节作用。为了建立荧光定量PCR技术检测猪SIRT1基因表达量,根据GenBank中猪SIRT1 mRNA序列设计引物,建立基于SYBR Green I染料技术的荧光定量PCR检测方法。结果表明,所建立的荧光定量PCR检测方法具有快速、敏感和特异性强等特点,为猪SIRT1基因定量分析提供了技术平台。
文摘本实验旨在研究沉默信息调节因子1(SIRT1)对牛卵泡颗粒细胞凋亡及雌激素分泌的影响。构建SIRT1基因干扰载体,并转染体外培养的颗粒细胞。实验分为转染SIRT1-sh RNA的干扰组、转染NC-sh RNA的对照组和未转染的空白组,每组设3个重复。流式细胞术检测细胞凋亡;实时荧光定量PCR检测细胞内Bax、Bcl-2 m RNA表达;Western Blot检测细胞内Bax、Bcl-2蛋白表达;ELISA试剂盒检测雌激素水平。结果表明:干扰组颗粒细胞SIRT1 m RNA表达量显著低于对照组与空白组(P<0.05),而对照组与空白组之间差异不显著(P>0.05);干扰组颗粒细胞凋亡率显著低于对照组与空白组(P<0.05);干扰组颗粒细胞Bax m RNA和蛋白质表达显著低于对照组与空白组(P<0.05),而Bcl-2 m RNA和蛋白质表达均显著高于对照组与空白组(P<0.05);干扰组颗粒细胞培养液中雌激素含量显著低于对照组与空白组(P<0.05)。SIRT1基因可以促进牛卵泡颗粒细胞的凋亡,并促进雌激素分泌。
文摘目的通过研究沉默信息调节因子1(SIRT1)基因敲除对骨关节炎小鼠VEGF/AKT通路的作用,探讨骨关节炎关节软骨退变的可能机制。方法将小鼠分为两组:SIRT1^(+/+)小鼠骨关节炎模型组(A组,n=6);SIRT1^(-/-)小鼠骨关节炎模型组(B组,n=6)。荧光定量聚合酶链反应检测SIRT1基因表达情况;HE染色、番红O-固绿双染色观察膝关节软骨形态结构改变,Mankin评分评价膝关节关节软骨退变,免疫组化染色检测膝关节软骨细胞中SIRT1、VEGF和AKT蛋白水平。结果 B组SIRT1 m RNA表达量为2.24417±1.316569,明显低于A组(P<0.01)。HE染色和番红O-固绿双染色结果显示,B组膝关节关节软骨退变明显,Mankin评分分值为9.8333±1.94079分,明显高于A组(P<0.05),B组SIRT1、VEGF和AKT免疫组化染色积分分别为3.3333±1.96638、10.0000±2.44949和1.3333±1.21106,B组SIRT1蛋白表达与A组相比差异不显著(P>0.05);B组VEGF蛋白表达明显高于A组(P<0.05);B组AKT蛋白表达明显低于A组(P<0.01)。结论 SIRT1基因敲除可能通过激活VEGF/AKT通路加重骨关节炎关节软骨的退变,因此SIRT1基因可能对骨关节炎起到保护作用。
文摘【目的】探讨沉默信息调节因子1(Silent information regulator1,SIRT1)对牛卵泡颗粒细胞增殖及细胞周期的影响。【方法】选取牛卵巢上直径2～6mm的卵泡,用注射器抽取卵泡中的颗粒细胞,进行体外培养。根据牛SIRT1基因的核苷酸序列,构建了4条干扰载体(shRNA-SIRT1-1597、shRNA-SIRT1-1471、shRNA-SIRT1-1186、shRNA-SIRT1-1306)及1条阴性对照载体(shRNA-NC),利用脂质体将质粒转入牛卵泡颗粒细胞,通过实时荧光定量PCR法筛选出干扰效果最佳的干扰载体用于后续试验。以转染shRNA-SIRT1-1471的颗粒细胞为干扰组,转染sh-RNA-NC的颗粒细胞为阴性对照组,不做处理的颗粒细胞为空白对照组,采用CCK-8法检测转染后24,36,48和60h各组颗粒细胞增殖情况,用流式细胞术检测转染后24,36和48h各组颗粒细胞的细胞周期变化情况。【结果】转染后48hshRNA-SIRT1-1471干扰的颗粒细胞SIRT1表达量显著低于其他处理组(P<0.05),故选用shRNA-SIRT1-1471作为最佳干扰载体。转染后24,36,48和60h,干扰组颗粒细胞增殖效果显著高于空白对照组和阴性对照组(P<0.05);转染后24～48h干扰组与空白对照组和阴性对照组相比G1期细胞比例显著降低,S期细胞比例显著升高,从而使更多细胞进入M期进行正常的有丝分裂,促进细胞增殖。【结论】SIRT1能抑制牛卵泡颗粒细胞的增殖,并阻滞细胞周期的进程。
