ABSTRACT A quantitative method for the assay of free cholesterol has been described in this paper. The experimental conditions for the determination of cholesterol in serum by Thin-layer chromatography were disscused....ABSTRACT A quantitative method for the assay of free cholesterol has been described in this paper. The experimental conditions for the determination of cholesterol in serum by Thin-layer chromatography were disscused. The solvent System was petroleum ether-ethyl acetate-glacial acetic acid (8o:20:1) and the spra-ying reagent was a solution of sulphuric acid and vanillin. Under the selected con-ditions, the peak area was linearly related to the cholesterol amount for the range between 80～700 ng per spot. The intraplate and interplate coefficients were 2.4% and 7.4% respectively. The recovery of cholesterol was 101.6%. The method presented was simple, rapid and accurate. The results of experi-mental investigation and clinical application were satisfactory.展开更多
Cholesterol,a major lipid component of plasma membrane,is thoughtto have profound effects on the structure and function of cells.Mostanimal tis-sues are capable of synthesizing cholesterol de novo from acetate;however...Cholesterol,a major lipid component of plasma membrane,is thoughtto have profound effects on the structure and function of cells.Mostanimal tis-sues are capable of synthesizing cholesterol de novo from acetate;however,thereare relatively few mammalian cells in vitro expressing an absolute requirement foran exogenous source of cholesterol.In this paper,it was shown that IR983F(983)rat myeloma cells and P3X63-AgS-U1(P3U1)and P3X63-Ag8.653(653)mousemy eloma cells which had been cultivated in serum-free medium for more than 6months required cholesterol in vitro for growth in serum-free medium.Optimalgrowth of P3U1,653 and 983 occurred in cholesterol concentration of 5,10 and15μg/ml,respectively.Moreover,it was demonstrated that the cholesterol couldbe replaced by human low density lipoprotein in a concentration of 10μg/ml butnot by mevalonic acid lactone.In contrast to the parental myeloma cells,hybridoma cells derived from the mouse myeloma cells which had been cultivatedin serum-free medium for more than 6 months did not require cholesterol.展开更多
AIM:To describe the cardiovascular disease(CVD)risk factors in a population of children with celiac disease(CD)on a gluten-free diet(GFD).METHODS:This cross-sectional multicenter study was performed at Schneider Child...AIM:To describe the cardiovascular disease(CVD)risk factors in a population of children with celiac disease(CD)on a gluten-free diet(GFD).METHODS:This cross-sectional multicenter study was performed at Schneider Children’s Medical Center of Israel(Petach Tiqva,Israel),and San Paolo Hospital(Milan,Italy).We enrolled 114 CD children in serologic remission,who were on a GFD for at least one year.At enrollment,anthropometric measurements,blood lipids and glucose were assessed,and compared to values at diagnosis.The homeostasis model assessment-estimated insulin resistance was calculated as a measure of insulin resistance.RESULTS:Three or more concomitant CVD risk factors[body mass index,waist circumference,low density lipoprotein(LDL)cholesterol,triglycerides,blood pressure and insulin resistance]were identified in 14%of CD subjects on a GFD.The most common CVD risk factors were high fasting triglycerides(34.8%),elevated blood pressure(29.4%),and high concentrations of calculated LDL cholesterol(24.1%).On a GFD,four children(3.5%)had insulin resistance.Fasting insulin and HOMA-IR were significantly higher in the Italian cohort compared to the Israeli cohort(P<0.001).Children on a GFD had an increased prevalence of borderline LDL cholesterol(24%)when compared to values(10%)at diagnosis(P=0.090).Trends towards increases in overweight(from 8.8%to 11.5%)and obesity(from 5.3%to 8.8%)were seen on a GFD.CONCLUSION:This report of insulin resistance and CVD risk factors in celiac children highlights the importance of CVD screening,and the need for dietary counseling targeting CVD prevention.展开更多
[目的]研究绞股蓝总皂苷(gypenosides,GPs)对RAW264.7细胞脂质累积及细胞内氯离子通道蛋白1(chloride intracellular channel 1,CLIC1)表达的影响,探讨GPs抗动脉粥样硬化的分子机制。[方法]将RAW264.7细胞接种于六孔板中,分为NC组、氧...[目的]研究绞股蓝总皂苷(gypenosides,GPs)对RAW264.7细胞脂质累积及细胞内氯离子通道蛋白1(chloride intracellular channel 1,CLIC1)表达的影响,探讨GPs抗动脉粥样硬化的分子机制。[方法]将RAW264.7细胞接种于六孔板中,分为NC组、氧化型低密度脂蛋白(oxidized low density lipoprotein,ox-LDL)组、GPs 10组、GPs 50组、GPs 100组及CLIC1 si RNA组。各组细胞处理24h后,油红O染色检测各组细胞内脂质的累积,化学法检测细胞内总胆固醇(total cholesterol,TC)及游离胆固醇(free cholesterol,FC)的含量,荧光定量PCR和免疫印迹法检测CLIC1、CD36m RNA和蛋白质的表达,免疫荧光技术观察CLIC1的细胞定位,并用MQAE法检测细胞内氯离子浓度的变化。[结果]与NC组相比,ox-LDL组CLIC1、CD36 m RNA(P<0.01,P<0.001)及蛋白(P<0.01,P<0.001)表达水平显著升高,细胞内TC(P<0.001)、FC(P<0.01)显著升高,细胞膜上CLIC1表达显著升高,细胞内氯离子浓度显著增加(P<0.01);经CLIC1 si RNA或GPs处理后,细胞内TC(P<0.001,P<0.001)、FC(P<0.01,P<0.01)含量降低,脂质累积减少,CLIC1、CD36 m RNA及蛋白表达水平显著下调(P<0.01,P<0.001)。[结论]CLIC1在巨噬细胞脂质累积中发挥着重要的作用,GPs可以通过调控CLIC1的表达抑制巨噬细胞脂质累积。展开更多
Hemoglobin was used as a mimetic peroxidase in the catalytic chemiluminescence reaction of lumino and hydrogen peroxide. The hemoglobin-catalyzed reaction was coupled with the oxidation reaction of cholesterol catalyz...Hemoglobin was used as a mimetic peroxidase in the catalytic chemiluminescence reaction of lumino and hydrogen peroxide. The hemoglobin-catalyzed reaction was coupled with the oxidation reaction of cholesterol catalyzed by COA(cholesterol oxydase , COA.) to determine total cholesterol(TC)and free cholesterol (FC) in human serum by flow injection chemiluminescence method. The sampling frequency was 30 s/h. The linear range for free cholesterol is 5.6×10-7mol/L～3.8×10-5mol/L and the detection limit is 3.0×10-7mol/L. The linear range for total cholesterol is 1.1×10-6mol/L～4.3×10-5mol/L and the detection limit is 1.5×10-7mol/L.展开更多
文摘ABSTRACT A quantitative method for the assay of free cholesterol has been described in this paper. The experimental conditions for the determination of cholesterol in serum by Thin-layer chromatography were disscused. The solvent System was petroleum ether-ethyl acetate-glacial acetic acid (8o:20:1) and the spra-ying reagent was a solution of sulphuric acid and vanillin. Under the selected con-ditions, the peak area was linearly related to the cholesterol amount for the range between 80～700 ng per spot. The intraplate and interplate coefficients were 2.4% and 7.4% respectively. The recovery of cholesterol was 101.6%. The method presented was simple, rapid and accurate. The results of experi-mental investigation and clinical application were satisfactory.
基金This project was partially supported by National Natural Science Foundation of China No. 3880715General Logistics Department of PLA
文摘Cholesterol,a major lipid component of plasma membrane,is thoughtto have profound effects on the structure and function of cells.Mostanimal tis-sues are capable of synthesizing cholesterol de novo from acetate;however,thereare relatively few mammalian cells in vitro expressing an absolute requirement foran exogenous source of cholesterol.In this paper,it was shown that IR983F(983)rat myeloma cells and P3X63-AgS-U1(P3U1)and P3X63-Ag8.653(653)mousemy eloma cells which had been cultivated in serum-free medium for more than 6months required cholesterol in vitro for growth in serum-free medium.Optimalgrowth of P3U1,653 and 983 occurred in cholesterol concentration of 5,10 and15μg/ml,respectively.Moreover,it was demonstrated that the cholesterol couldbe replaced by human low density lipoprotein in a concentration of 10μg/ml butnot by mevalonic acid lactone.In contrast to the parental myeloma cells,hybridoma cells derived from the mouse myeloma cells which had been cultivatedin serum-free medium for more than 6 months did not require cholesterol.
文摘AIM:To describe the cardiovascular disease(CVD)risk factors in a population of children with celiac disease(CD)on a gluten-free diet(GFD).METHODS:This cross-sectional multicenter study was performed at Schneider Children’s Medical Center of Israel(Petach Tiqva,Israel),and San Paolo Hospital(Milan,Italy).We enrolled 114 CD children in serologic remission,who were on a GFD for at least one year.At enrollment,anthropometric measurements,blood lipids and glucose were assessed,and compared to values at diagnosis.The homeostasis model assessment-estimated insulin resistance was calculated as a measure of insulin resistance.RESULTS:Three or more concomitant CVD risk factors[body mass index,waist circumference,low density lipoprotein(LDL)cholesterol,triglycerides,blood pressure and insulin resistance]were identified in 14%of CD subjects on a GFD.The most common CVD risk factors were high fasting triglycerides(34.8%),elevated blood pressure(29.4%),and high concentrations of calculated LDL cholesterol(24.1%).On a GFD,four children(3.5%)had insulin resistance.Fasting insulin and HOMA-IR were significantly higher in the Italian cohort compared to the Israeli cohort(P<0.001).Children on a GFD had an increased prevalence of borderline LDL cholesterol(24%)when compared to values(10%)at diagnosis(P=0.090).Trends towards increases in overweight(from 8.8%to 11.5%)and obesity(from 5.3%to 8.8%)were seen on a GFD.CONCLUSION:This report of insulin resistance and CVD risk factors in celiac children highlights the importance of CVD screening,and the need for dietary counseling targeting CVD prevention.
文摘[目的]研究绞股蓝总皂苷(gypenosides,GPs)对RAW264.7细胞脂质累积及细胞内氯离子通道蛋白1(chloride intracellular channel 1,CLIC1)表达的影响,探讨GPs抗动脉粥样硬化的分子机制。[方法]将RAW264.7细胞接种于六孔板中,分为NC组、氧化型低密度脂蛋白(oxidized low density lipoprotein,ox-LDL)组、GPs 10组、GPs 50组、GPs 100组及CLIC1 si RNA组。各组细胞处理24h后,油红O染色检测各组细胞内脂质的累积,化学法检测细胞内总胆固醇(total cholesterol,TC)及游离胆固醇(free cholesterol,FC)的含量,荧光定量PCR和免疫印迹法检测CLIC1、CD36m RNA和蛋白质的表达,免疫荧光技术观察CLIC1的细胞定位,并用MQAE法检测细胞内氯离子浓度的变化。[结果]与NC组相比,ox-LDL组CLIC1、CD36 m RNA(P<0.01,P<0.001)及蛋白(P<0.01,P<0.001)表达水平显著升高,细胞内TC(P<0.001)、FC(P<0.01)显著升高,细胞膜上CLIC1表达显著升高,细胞内氯离子浓度显著增加(P<0.01);经CLIC1 si RNA或GPs处理后,细胞内TC(P<0.001,P<0.001)、FC(P<0.01,P<0.01)含量降低,脂质累积减少,CLIC1、CD36 m RNA及蛋白表达水平显著下调(P<0.01,P<0.001)。[结论]CLIC1在巨噬细胞脂质累积中发挥着重要的作用,GPs可以通过调控CLIC1的表达抑制巨噬细胞脂质累积。
文摘Hemoglobin was used as a mimetic peroxidase in the catalytic chemiluminescence reaction of lumino and hydrogen peroxide. The hemoglobin-catalyzed reaction was coupled with the oxidation reaction of cholesterol catalyzed by COA(cholesterol oxydase , COA.) to determine total cholesterol(TC)and free cholesterol (FC) in human serum by flow injection chemiluminescence method. The sampling frequency was 30 s/h. The linear range for free cholesterol is 5.6×10-7mol/L～3.8×10-5mol/L and the detection limit is 3.0×10-7mol/L. The linear range for total cholesterol is 1.1×10-6mol/L～4.3×10-5mol/L and the detection limit is 1.5×10-7mol/L.
