BACKGROUND： During the cellular aging process, the number of mitochondria, generation of adenosine triphosphate （ATP）, activity of respiratory chain enzyme complex 1 and 4, and oxidation decrease. OBJECTIVE： To ob...BACKGROUND： During the cellular aging process, the number of mitochondria, generation of adenosine triphosphate （ATP）, activity of respiratory chain enzyme complex 1 and 4, and oxidation decrease. OBJECTIVE： To observe the effects of aqueous and spirituous extract, as well as polysaccharides from Fructus schizandrae （Magnolia Vine） on energy metabolism and mitochondrial anti-oxidation in cranial nerve cells of a D-gal-induced aging mouse model. DESIGN, TIME AND SETTING： A randomized, controlled, animal study. The experiment was conducted at the Department of Biochemistry, Qiqihar Medical College between March and July 2006. MATERIALS： Fifty healthy, Kunming mice of both sexes, aged 2 3 months old and weighing 18 22 g, were used for the present study. Fructus schizandrae was purchased from the Medical College of Jiamusi University. Aqueous extracts, spirituous extracts, and polysaccharides from Fructus schizandrae were prepared. D-galactose （D-gal） is a product of the Second Reagent Factory, Shanghai City, China. Mn-superoxide dismutase （Mn-SOD） kit, malonaldehyde （MDA） kit, protein quantification kit, and inorganic phosphorus testing kit were purchased from Jian Cheng Bioeng. Co., China. METHODS： Fifty mice were randomly divided into five groups, with 10 mice in each group： young control, aging model, aqueous Fructus schizandrae extract, spirituous Fructus schizandrae extract, and Fructus schizandrae polysaccharides. Over a course of 30 days, mice in aging model, aqueous Fructus schizandrae extract, spirituous Fructus schizandrae extract, and Fructus schizandrae polysaccharides groups were injected subcutaneously with D-gal （100 mg/kg） into the nape of the neck daily, and administered intragastrically with an equal volume of sterile, warm water （aging model）, aqueous Fructus schizandrae extract （2 g/kg）, spirituous Fructus schizandrae extract （2 g/kg）, or Fructus schizandrae polysaccharides （0.2 g/kg）, respectively. Mice in the young control group were injected into the nape of the neck with physiological saline and administered intragastrically with sterile, warm water. MAIN OUTCOME MEASURES： Respiratory chain complex I and H^＋-ATP enzyme activities, as well as Mn-SOD and MDA levels, were determined by the Coomassie brilliant blue method. RESULTS： All fifty mice were included in the final analysis. In mitochondria fiom cranial nerve cells of the aging mouse group MDA levels were significantly increased, compared with young control group （P 〈 0.01）; however, Mn-SOD levels, as well as respiratory chain complex I and H＋-ATP enzyme activity, were remarkably decreased （P 〈 0.01 ）. In each Fructus schizandrae group, Mn-SOD levels, as well as respiratory chain complex I and H＋-ATP enzyme activity was enhanced to various extents （P 〈 0.05, P 〈 0.01）, and MDA levels were decreased （P 〈 0.01）, compared with the aging model group. CONCLUSION： Aqueous and spirituous Fructus schizandrae extracts, as well as Fructus schizandrae polysaccharides delayed changes in mitochondrial energy metabolism, increased Mn-SOD levels, and decreased MDA levels in cranial nerve cell mitochondria of an aging mouse model. Fructus schizandrae polysaccharides were particularly capable of protecting mitochondria from oxidative injury.展开更多
This paper focuses on a bioenergetic mechanism responding to hypoxia. This response involves hypoxia-induced reprogramming of respiratory chain function and switching from oxidation of complex I (NAD-related substrate...This paper focuses on a bioenergetic mechanism responding to hypoxia. This response involves hypoxia-induced reprogramming of respiratory chain function and switching from oxidation of complex I (NAD-related substrates) to complex II (succinate oxidation). Transient, reversible, compensatory activation of respiratory chain complex II is a major mechanism of urgent adaptation to hypoxia, which is necessary for 1) succinate-related energy synthesis in the conditions of oxygen shortage and formation of urgent resistance;2) succinate-related stabilization of HIF-1α and initiation of its transcriptional activity related with formation of long-term adaptation;3) succinate-dependent activation of the succinate-specific receptor GPR91. Thus, mitochondria perform a signaling function with succinate as a signaling molecule. Effects of succinate in hypoxia occur at three levels, intramitochondrial, intracellular and intercellular. In these settings, succinate displays antihypoxic activity. The review is focused on tactics and strategy for development of the antihypoxic defense and antihypoxants with energotropic properties.展开更多
目的探讨2型糖尿病(T2DM)患者线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性与疲劳之间的潜在关系。方法选取2022年1月1日—2022年12月31日于泗洪县第一人民医院就诊的130例T2DM患者作为研究对象,根据疲劳量表评分分为糖尿病无疲乏组和糖尿病疲乏...目的探讨2型糖尿病(T2DM)患者线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性与疲劳之间的潜在关系。方法选取2022年1月1日—2022年12月31日于泗洪县第一人民医院就诊的130例T2DM患者作为研究对象,根据疲劳量表评分分为糖尿病无疲乏组和糖尿病疲乏组。采集患者的血样,进行常规的空腹血糖(FBG)、糖化血红蛋白(HbA1c)检测,分别使用辅酶Q10(CoQ10)酶联免疫试剂盒和线粒体呼吸链复合物活性定量检测试剂盒检测CoQ10和呼吸链复合酶Ⅰ、Ⅱ、Ⅲ的活性。采用独立样本t检验、双相关Pearson检验、ROC曲线、二元logistic回归分析评估各项临床指标与糖尿病疲劳风险的相关性。结果2组患者FBG、HbA1c、24 h平均血糖(24 h MBG)及24 h血糖标准差(24 h SDBG)和简单自测抑郁量表(PHQ-9)、广泛性焦虑量表(GAD-7)评分差异无统计学意义(P>0.05)。疲乏组患者CoQ10和线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ水平均低于无疲乏组患者(P<0.05)。T2DM患者CoQ10水平和线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性与疲劳量表评分呈负相关(r=-0.451~-0.906,P<0.05)。性别(女性)、年龄(60~69岁/70~79岁)、病程(10~年)均为影响T2DM患者产生疲劳感的独立危险因素。结论线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性降低与T2DM患者疲劳感产生密切相关,而且对T2DM患者疲劳感的产生具有预测价值。展开更多
文摘BACKGROUND： During the cellular aging process, the number of mitochondria, generation of adenosine triphosphate （ATP）, activity of respiratory chain enzyme complex 1 and 4, and oxidation decrease. OBJECTIVE： To observe the effects of aqueous and spirituous extract, as well as polysaccharides from Fructus schizandrae （Magnolia Vine） on energy metabolism and mitochondrial anti-oxidation in cranial nerve cells of a D-gal-induced aging mouse model. DESIGN, TIME AND SETTING： A randomized, controlled, animal study. The experiment was conducted at the Department of Biochemistry, Qiqihar Medical College between March and July 2006. MATERIALS： Fifty healthy, Kunming mice of both sexes, aged 2 3 months old and weighing 18 22 g, were used for the present study. Fructus schizandrae was purchased from the Medical College of Jiamusi University. Aqueous extracts, spirituous extracts, and polysaccharides from Fructus schizandrae were prepared. D-galactose （D-gal） is a product of the Second Reagent Factory, Shanghai City, China. Mn-superoxide dismutase （Mn-SOD） kit, malonaldehyde （MDA） kit, protein quantification kit, and inorganic phosphorus testing kit were purchased from Jian Cheng Bioeng. Co., China. METHODS： Fifty mice were randomly divided into five groups, with 10 mice in each group： young control, aging model, aqueous Fructus schizandrae extract, spirituous Fructus schizandrae extract, and Fructus schizandrae polysaccharides. Over a course of 30 days, mice in aging model, aqueous Fructus schizandrae extract, spirituous Fructus schizandrae extract, and Fructus schizandrae polysaccharides groups were injected subcutaneously with D-gal （100 mg/kg） into the nape of the neck daily, and administered intragastrically with an equal volume of sterile, warm water （aging model）, aqueous Fructus schizandrae extract （2 g/kg）, spirituous Fructus schizandrae extract （2 g/kg）, or Fructus schizandrae polysaccharides （0.2 g/kg）, respectively. Mice in the young control group were injected into the nape of the neck with physiological saline and administered intragastrically with sterile, warm water. MAIN OUTCOME MEASURES： Respiratory chain complex I and H^＋-ATP enzyme activities, as well as Mn-SOD and MDA levels, were determined by the Coomassie brilliant blue method. RESULTS： All fifty mice were included in the final analysis. In mitochondria fiom cranial nerve cells of the aging mouse group MDA levels were significantly increased, compared with young control group （P 〈 0.01）; however, Mn-SOD levels, as well as respiratory chain complex I and H＋-ATP enzyme activity, were remarkably decreased （P 〈 0.01 ）. In each Fructus schizandrae group, Mn-SOD levels, as well as respiratory chain complex I and H＋-ATP enzyme activity was enhanced to various extents （P 〈 0.05, P 〈 0.01）, and MDA levels were decreased （P 〈 0.01）, compared with the aging model group. CONCLUSION： Aqueous and spirituous Fructus schizandrae extracts, as well as Fructus schizandrae polysaccharides delayed changes in mitochondrial energy metabolism, increased Mn-SOD levels, and decreased MDA levels in cranial nerve cell mitochondria of an aging mouse model. Fructus schizandrae polysaccharides were particularly capable of protecting mitochondria from oxidative injury.
文摘This paper focuses on a bioenergetic mechanism responding to hypoxia. This response involves hypoxia-induced reprogramming of respiratory chain function and switching from oxidation of complex I (NAD-related substrates) to complex II (succinate oxidation). Transient, reversible, compensatory activation of respiratory chain complex II is a major mechanism of urgent adaptation to hypoxia, which is necessary for 1) succinate-related energy synthesis in the conditions of oxygen shortage and formation of urgent resistance;2) succinate-related stabilization of HIF-1α and initiation of its transcriptional activity related with formation of long-term adaptation;3) succinate-dependent activation of the succinate-specific receptor GPR91. Thus, mitochondria perform a signaling function with succinate as a signaling molecule. Effects of succinate in hypoxia occur at three levels, intramitochondrial, intracellular and intercellular. In these settings, succinate displays antihypoxic activity. The review is focused on tactics and strategy for development of the antihypoxic defense and antihypoxants with energotropic properties.
文摘目的探讨2型糖尿病(T2DM)患者线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性与疲劳之间的潜在关系。方法选取2022年1月1日—2022年12月31日于泗洪县第一人民医院就诊的130例T2DM患者作为研究对象,根据疲劳量表评分分为糖尿病无疲乏组和糖尿病疲乏组。采集患者的血样,进行常规的空腹血糖(FBG)、糖化血红蛋白(HbA1c)检测,分别使用辅酶Q10(CoQ10)酶联免疫试剂盒和线粒体呼吸链复合物活性定量检测试剂盒检测CoQ10和呼吸链复合酶Ⅰ、Ⅱ、Ⅲ的活性。采用独立样本t检验、双相关Pearson检验、ROC曲线、二元logistic回归分析评估各项临床指标与糖尿病疲劳风险的相关性。结果2组患者FBG、HbA1c、24 h平均血糖(24 h MBG)及24 h血糖标准差(24 h SDBG)和简单自测抑郁量表(PHQ-9)、广泛性焦虑量表(GAD-7)评分差异无统计学意义(P>0.05)。疲乏组患者CoQ10和线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ水平均低于无疲乏组患者(P<0.05)。T2DM患者CoQ10水平和线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性与疲劳量表评分呈负相关(r=-0.451~-0.906,P<0.05)。性别(女性)、年龄(60~69岁/70~79岁)、病程(10~年)均为影响T2DM患者产生疲劳感的独立危险因素。结论线粒体呼吸链复合酶Ⅰ、Ⅱ、Ⅲ活性降低与T2DM患者疲劳感产生密切相关,而且对T2DM患者疲劳感的产生具有预测价值。
