Objective: With regard to the 2010 edition of Dietary Reference Intakes for Japanese (DRIs-2010), we investigated whether the DRIs for two age groups, breast-fed infants aged 6-8 and 9-11 months, can be fulfilled for ...Objective: With regard to the 2010 edition of Dietary Reference Intakes for Japanese (DRIs-2010), we investigated whether the DRIs for two age groups, breast-fed infants aged 6-8 and 9-11 months, can be fulfilled for every nutrient in actual dietary practice. Design: We evaluated (1) whether the DRIs for all nutrients can be fulfilled in a formula with energy and protein exceeding their DRIs, (2) whether the DRIs for all nutrients can be fulfilled in a formula prepared in accordance with Japanese government-recommended weaning guidelines, and (3) what kinds of formulas can be prepared if the DRIs for all nutrients are fulfilled without referring to the weaning guidelines. Setting: Simulation of diet menu on the basis of published data in our university and survey of diet menu in a university hospital attached to a national medical school. Subjects: The three types of formulas were planned for ten days. Results: It was impossible to simultaneously fulfil the DRIs for 6 - 8-month-old infants concerning pantothenic acid, vitamin D, and iron and those for 9 - 11-month-old infants concerning these nutrients plus protein. Conclusion: According to the DRIs-2010, the DRI for all nutrients could not be fulfilled in an ingestible formula.展开更多
目的对Piezo1蛋白在巨噬细胞参与铁代谢平衡调控中作用作一综述,总结近年来关于年龄相关骨量丢失及巨噬细胞Piezo1的最新研究进展,为治疗年龄相关骨量丢失提供新思路。方法计算机检索CNKI、PubMed等数据库自建库至2023年1月与巨噬细胞Pi...目的对Piezo1蛋白在巨噬细胞参与铁代谢平衡调控中作用作一综述,总结近年来关于年龄相关骨量丢失及巨噬细胞Piezo1的最新研究进展,为治疗年龄相关骨量丢失提供新思路。方法计算机检索CNKI、PubMed等数据库自建库至2023年1月与巨噬细胞Piezo1在年龄相关骨量丢失的相关文献,中文检索关键词为“巨噬细胞、机械敏感性离子通道蛋白、年龄相关骨量丢失、骨质疏松症”,英文检索关键词为“Macrophages、Piezo1、age⁃related bone loss、ARBL、Osteoporosis”,最终将42篇文献纳入。结果与结论巨噬细胞参与铁代谢平衡的调控,骨髓巨噬细胞中Piezo1高表达能导致机体出现铁超载,进而导致ARBL的发生。Piezo1为治疗年龄相关骨量丢失提供了分子层面的新思路和新视角。展开更多
目的探讨血清铁调节蛋白2(iron-regulated protein 2,IRP2)、诱饵受体3(decoy receptor 3,DcR3)水平与老年慢性阻塞性肺疾病急性加重期(acute exacerbation of chronic obstructive pulmonary disease,AECOPD)患者疾病转归的关系。方法...目的探讨血清铁调节蛋白2(iron-regulated protein 2,IRP2)、诱饵受体3(decoy receptor 3,DcR3)水平与老年慢性阻塞性肺疾病急性加重期(acute exacerbation of chronic obstructive pulmonary disease,AECOPD)患者疾病转归的关系。方法选择AECOPD患者(AECOPD组)88例,检测血清IRP2、DcR3水平,追踪AECOPD患者临床疾病转归,根据临床疾病转归将其分为恶化组(22例)和好转组(66例)。多因素Logistic回归分析AECOPD患者疾病转归的影响因素。受试者工作特征曲线(receiver operating characteristic curve,ROC)分析IRP2、DcR3预测AECOPD患者疾病转归的价值。结果恶化组近1年AECOPD发作次数、急性生理和慢性健康状况评分、合并休克、呼吸困难评分(modified medical research council,mMRC)分级3~4级高于好转组(P<0.05)。恶化组治疗前和治疗2周后血清IRP2、DcR3水平高于好转组,治疗2周后好转组血清IRP2、DcR3水平低于治疗前(P<0.05);恶化组血清IRP2、DcR3水平与治疗前比较差异无统计学意义(P>0.05)。多因素Logistic回归分析结果显示,近1年AECOPD发作次数、mMRC分级、治疗前IRP2、治疗前DcR3是AECOPD患者疾病恶化的危险因素(P<0.05)。治疗前IRP2、DcR3预测AECOPD患者疾病转归的曲线下面积为0.781、0.795,联合IRP2、DcR3预测AECOPD患者疾病转归的曲线下面积为0.918,大于单独IRP2、DcR3预测(P<0.05)。结论AECOPD患者血清IRP2、DcR3水平均显著增高,且与肺功能降低以及疾病恶化有关,检测血清IRP2、DcR3水平有助于对AECOPD患者疾病转归的预测。展开更多
Deposition of protein and metal ions （Fe, Zn） in rice grains is a complex polygenic trait showing considerable environmental effect. To analyze the effect of nitrogen application levels and native soil properties on...Deposition of protein and metal ions （Fe, Zn） in rice grains is a complex polygenic trait showing considerable environmental effect. To analyze the effect of nitrogen application levels and native soil properties on rice grain protein, iron （Fe） and zinc （Zn） contents, 32 rice genotypes were grown at three different locations each under 80 and 120 kg/hm2 nitrogen fertilizer applications. In treatments with nitrogen fertilizer application, the brown rice grain protein content （GPC） increased significantly （1.1% to 7.0%） under higher nitrogen fertilizer application （120 kg/hm2） whereas grain Fe/Zn contents showed non-significant effect of nitrogen application level, thus suggesting that the rate of uptake and translocation of macro-elements does not influence the uptake and translocation of micro-elements. The pH, organic matter content and inherent Fe/Zn levels of native soil showed significant effects on grain Fe and Zn contents of all the rice genotypes. Grain Zn content of almost all the tested rice genotypes was found to increase at Location III having loamy soil texture, neutral pH value （pH 6.83） and higher organic matter content than the other two locations （Locations I and II）, indicating significant influence of native soil properties on brown rice grain Zn content while grain Fe content showed significant genotype × environment interaction effect. Genotypic difference was found to be the most significant factor to affect grain Fe/Zn contents in all the tested rice genotypes, indicating that although native soil properties influence phyto-availability of micronutrients and consequently influencing absorption, translocation and grain deposition of Fe/Zn ions, yet genetic makeup of a plant determines its response to varied soil conditions and other external factors. Two indica rice genotypes R-RF-31 （27.62 μg/g grain Zn content and 7.80% GPC） and R1033-968-2-1 （30.05 μg/g grain Zn content and 8.47% GPC） were identified as high grain Zn and moderate GPC rice genotypes. These results indicate that soil property and organic matter content increase the availability of Fe and Zn in rhizosphere, which in turn enhances the uptake, translocation and redistribution of Fe/Zn into rice grains.展开更多
Background and objective The expression of various trace elements and markers in lung cancer is controversial.The aim of this study is to evaluate the presence of calcium(Ca),copper(Cu),iron(Fe) and carcinoembryonic a...Background and objective The expression of various trace elements and markers in lung cancer is controversial.The aim of this study is to evaluate the presence of calcium(Ca),copper(Cu),iron(Fe) and carcinoembryonic antigen(CEA) in cancerous untreated lung tissues and to determine a possible association between these markers and lung cancer.Methods Fourty-eight cancerous lung tissue blocks,from Sultan Qaboos University Hospital,Sultanate of Oman,were studied.Fe,Ca,Cu,and CEA were demonstrated in the tissue blocks using Perl's Prussian blue,Von Kossa's,modified rhodanine and immunohistochemical staining methods,respectively.Results Twenty-three of 48 specimens showed positive Fe staining,2 showed positive Ca staining and Cu was absent in all specimens.93.7% expressed CEA in varying degree of positivity.81.25% of these sections showed high expression of CEA.Conclusion Tissue concentrations of trace elements were not elevated in lung cancer and therefore cannot be considered as a potential marker.Despite the low sensitivity and specificity of CEA as previously reported,tissue CEA should be considered as a potential marker in the evaluation of lung cancer.展开更多
Objective: To produce fluorescent tagged recombinant erythroferrone protein(ERFE_eGFP) for laboratory investigations. Methods: Erythroferrone(ERFE) gene was fused to green fluorescent protein(eGFP) gene and cloned in ...Objective: To produce fluorescent tagged recombinant erythroferrone protein(ERFE_eGFP) for laboratory investigations. Methods: Erythroferrone(ERFE) gene was fused to green fluorescent protein(eGFP) gene and cloned in a pSecTag2Hygro plasmid. The constructed plasmid was amplified in Escherichia coli DH5α and the eGFP-fused ERFE(ERFE_eGFP) protein was expressed in human embryonic kidney(HEK293T) cell line. Results: The plasmid constructed from colony C6 contained ERFE_eGFP with the correct restriction sizes of 4.2 kb and expressed secretory ERFE_eGFP fusion protein(approximately size of 75 kDa) in HEK293T cell line. Conclusions: ERFE_eGFP recombinant protein is successfully expressed as a secretory functional protein and could be sensitively detected using fluorometry. This fusion protein might benefit future applications for localization of cellular ERFE receptors and competitive immunoassay of ERFE concentration.展开更多
The effect of iron deficiency on heterocyst differentiation and some physiological properties of the filamentous cyanobacterium Anabaena sp. PCC 7120 was investigated. Under moderate iron limitation conditions, ac...The effect of iron deficiency on heterocyst differentiation and some physiological properties of the filamentous cyanobacterium Anabaena sp. PCC 7120 was investigated. Under moderate iron limitation conditions, achieved by addition of iron chelator 2,2′\|Dipyridyl (<80 μmol/L) led to delayed heterocyst differentiation, no heterocyst differentiation was observed under severe iron limitation conditions, when the concentration of 2,2′\|Dipyridyl in the medium was more than 100 μmol/L . It seemed that there are certain iron\|regulated genes or operons whose function is to control heterocyst development. In addition, iron deficiency impaired the growth. Low\|iron cells had a decrease in the quantities of pigment content (chlorophyll and phycocyanin content),the whole cell in vivo absorbance spectra confirmed the decrease, the protein electrophoretic profiles revealed that iron\|deficient cells had less protein bands, with the increase of 2,2′\|Dipyridyl ,the protein bands was more and more less. And differently, iron deficiency also caused an increase of ROS (Reactive Oxygen Species)and SOD activity, it suggests that iron deficiency led to oxidative stress, which generally occured under high\|iron conditions.展开更多
Cassava (Manihot esculenta Cranzt) is an important food security crop for poor rural communities particularly in Africa. However, little is known about variability of critical root nutritional and quality traits of Af...Cassava (Manihot esculenta Cranzt) is an important food security crop for poor rural communities particularly in Africa. However, little is known about variability of critical root nutritional and quality traits of African cassava germplasm. Cassava roots contain low levels of important micronutrients and its quality can be influenced by the levels of cyanogenic glucosides. Roots from fourteen accessions comprising Kenyan local landraces and improved clones were screened for their nutritional traits including the contents of cyanogenic glycosides, protein and the micro nutrients iron and zinc. Trait stability and the effects of the environment on the expression of the nutritional traits were evaluated using various genotype (G) by environment (E) interaction study models. There were significant (p ≤ 0.05) differences for all the nutritional traits in the three test sites of Baringo, Kericho and Nakuru in Kenya. Contents of cyanogenic glycosides in both roots and leaves, total root proteins, root iron and zinc ranged from 31.8 ppm to 90.8 ppm;20.8 ppm to 154.4 ppm;1.15% to 3.47%;17.81 ppm to 59.69 ppm and 39.39 ppm to 118 ppm, respectively. The sites were also significantly (p ≤ 0.05) different from each other with the highest cyanogenic content in leaves and roots expressed at the Nakuru site. Regression analysis was used to assess genotype response to environments. Regression coefficients (bi) obtained ranged from 0.13 to 2.23 for all traits combined indicating wide variability in quality trait among the test germplasm. Analysis for sensitivity to environmental change SEi2 revealed that cassava genotypes differed in their level of sensitivity. The root cyanide trait had the highest mean SEi2 which indicated that it was the least stable quality trait in the cassava germplasm. This implies that the same cassava genotypes will give food of different quality depending on growing environment. The observed values for protein and mineral contents suggest the potential for improving the nutritive value of local cassava germplasm.展开更多
文摘Objective: With regard to the 2010 edition of Dietary Reference Intakes for Japanese (DRIs-2010), we investigated whether the DRIs for two age groups, breast-fed infants aged 6-8 and 9-11 months, can be fulfilled for every nutrient in actual dietary practice. Design: We evaluated (1) whether the DRIs for all nutrients can be fulfilled in a formula with energy and protein exceeding their DRIs, (2) whether the DRIs for all nutrients can be fulfilled in a formula prepared in accordance with Japanese government-recommended weaning guidelines, and (3) what kinds of formulas can be prepared if the DRIs for all nutrients are fulfilled without referring to the weaning guidelines. Setting: Simulation of diet menu on the basis of published data in our university and survey of diet menu in a university hospital attached to a national medical school. Subjects: The three types of formulas were planned for ten days. Results: It was impossible to simultaneously fulfil the DRIs for 6 - 8-month-old infants concerning pantothenic acid, vitamin D, and iron and those for 9 - 11-month-old infants concerning these nutrients plus protein. Conclusion: According to the DRIs-2010, the DRI for all nutrients could not be fulfilled in an ingestible formula.
文摘目的对Piezo1蛋白在巨噬细胞参与铁代谢平衡调控中作用作一综述,总结近年来关于年龄相关骨量丢失及巨噬细胞Piezo1的最新研究进展,为治疗年龄相关骨量丢失提供新思路。方法计算机检索CNKI、PubMed等数据库自建库至2023年1月与巨噬细胞Piezo1在年龄相关骨量丢失的相关文献,中文检索关键词为“巨噬细胞、机械敏感性离子通道蛋白、年龄相关骨量丢失、骨质疏松症”,英文检索关键词为“Macrophages、Piezo1、age⁃related bone loss、ARBL、Osteoporosis”,最终将42篇文献纳入。结果与结论巨噬细胞参与铁代谢平衡的调控,骨髓巨噬细胞中Piezo1高表达能导致机体出现铁超载,进而导致ARBL的发生。Piezo1为治疗年龄相关骨量丢失提供了分子层面的新思路和新视角。
文摘目的探讨血清铁调节蛋白2(iron-regulated protein 2,IRP2)、诱饵受体3(decoy receptor 3,DcR3)水平与老年慢性阻塞性肺疾病急性加重期(acute exacerbation of chronic obstructive pulmonary disease,AECOPD)患者疾病转归的关系。方法选择AECOPD患者(AECOPD组)88例,检测血清IRP2、DcR3水平,追踪AECOPD患者临床疾病转归,根据临床疾病转归将其分为恶化组(22例)和好转组(66例)。多因素Logistic回归分析AECOPD患者疾病转归的影响因素。受试者工作特征曲线(receiver operating characteristic curve,ROC)分析IRP2、DcR3预测AECOPD患者疾病转归的价值。结果恶化组近1年AECOPD发作次数、急性生理和慢性健康状况评分、合并休克、呼吸困难评分(modified medical research council,mMRC)分级3~4级高于好转组(P<0.05)。恶化组治疗前和治疗2周后血清IRP2、DcR3水平高于好转组,治疗2周后好转组血清IRP2、DcR3水平低于治疗前(P<0.05);恶化组血清IRP2、DcR3水平与治疗前比较差异无统计学意义(P>0.05)。多因素Logistic回归分析结果显示,近1年AECOPD发作次数、mMRC分级、治疗前IRP2、治疗前DcR3是AECOPD患者疾病恶化的危险因素(P<0.05)。治疗前IRP2、DcR3预测AECOPD患者疾病转归的曲线下面积为0.781、0.795,联合IRP2、DcR3预测AECOPD患者疾病转归的曲线下面积为0.918,大于单独IRP2、DcR3预测(P<0.05)。结论AECOPD患者血清IRP2、DcR3水平均显著增高,且与肺功能降低以及疾病恶化有关,检测血清IRP2、DcR3水平有助于对AECOPD患者疾病转归的预测。
文摘Deposition of protein and metal ions （Fe, Zn） in rice grains is a complex polygenic trait showing considerable environmental effect. To analyze the effect of nitrogen application levels and native soil properties on rice grain protein, iron （Fe） and zinc （Zn） contents, 32 rice genotypes were grown at three different locations each under 80 and 120 kg/hm2 nitrogen fertilizer applications. In treatments with nitrogen fertilizer application, the brown rice grain protein content （GPC） increased significantly （1.1% to 7.0%） under higher nitrogen fertilizer application （120 kg/hm2） whereas grain Fe/Zn contents showed non-significant effect of nitrogen application level, thus suggesting that the rate of uptake and translocation of macro-elements does not influence the uptake and translocation of micro-elements. The pH, organic matter content and inherent Fe/Zn levels of native soil showed significant effects on grain Fe and Zn contents of all the rice genotypes. Grain Zn content of almost all the tested rice genotypes was found to increase at Location III having loamy soil texture, neutral pH value （pH 6.83） and higher organic matter content than the other two locations （Locations I and II）, indicating significant influence of native soil properties on brown rice grain Zn content while grain Fe content showed significant genotype × environment interaction effect. Genotypic difference was found to be the most significant factor to affect grain Fe/Zn contents in all the tested rice genotypes, indicating that although native soil properties influence phyto-availability of micronutrients and consequently influencing absorption, translocation and grain deposition of Fe/Zn ions, yet genetic makeup of a plant determines its response to varied soil conditions and other external factors. Two indica rice genotypes R-RF-31 （27.62 μg/g grain Zn content and 7.80% GPC） and R1033-968-2-1 （30.05 μg/g grain Zn content and 8.47% GPC） were identified as high grain Zn and moderate GPC rice genotypes. These results indicate that soil property and organic matter content increase the availability of Fe and Zn in rhizosphere, which in turn enhances the uptake, translocation and redistribution of Fe/Zn into rice grains.
文摘Background and objective The expression of various trace elements and markers in lung cancer is controversial.The aim of this study is to evaluate the presence of calcium(Ca),copper(Cu),iron(Fe) and carcinoembryonic antigen(CEA) in cancerous untreated lung tissues and to determine a possible association between these markers and lung cancer.Methods Fourty-eight cancerous lung tissue blocks,from Sultan Qaboos University Hospital,Sultanate of Oman,were studied.Fe,Ca,Cu,and CEA were demonstrated in the tissue blocks using Perl's Prussian blue,Von Kossa's,modified rhodanine and immunohistochemical staining methods,respectively.Results Twenty-three of 48 specimens showed positive Fe staining,2 showed positive Ca staining and Cu was absent in all specimens.93.7% expressed CEA in varying degree of positivity.81.25% of these sections showed high expression of CEA.Conclusion Tissue concentrations of trace elements were not elevated in lung cancer and therefore cannot be considered as a potential marker.Despite the low sensitivity and specificity of CEA as previously reported,tissue CEA should be considered as a potential marker in the evaluation of lung cancer.
文摘Objective: To produce fluorescent tagged recombinant erythroferrone protein(ERFE_eGFP) for laboratory investigations. Methods: Erythroferrone(ERFE) gene was fused to green fluorescent protein(eGFP) gene and cloned in a pSecTag2Hygro plasmid. The constructed plasmid was amplified in Escherichia coli DH5α and the eGFP-fused ERFE(ERFE_eGFP) protein was expressed in human embryonic kidney(HEK293T) cell line. Results: The plasmid constructed from colony C6 contained ERFE_eGFP with the correct restriction sizes of 4.2 kb and expressed secretory ERFE_eGFP fusion protein(approximately size of 75 kDa) in HEK293T cell line. Conclusions: ERFE_eGFP recombinant protein is successfully expressed as a secretory functional protein and could be sensitively detected using fluorometry. This fusion protein might benefit future applications for localization of cellular ERFE receptors and competitive immunoassay of ERFE concentration.
文摘The effect of iron deficiency on heterocyst differentiation and some physiological properties of the filamentous cyanobacterium Anabaena sp. PCC 7120 was investigated. Under moderate iron limitation conditions, achieved by addition of iron chelator 2,2′\|Dipyridyl (<80 μmol/L) led to delayed heterocyst differentiation, no heterocyst differentiation was observed under severe iron limitation conditions, when the concentration of 2,2′\|Dipyridyl in the medium was more than 100 μmol/L . It seemed that there are certain iron\|regulated genes or operons whose function is to control heterocyst development. In addition, iron deficiency impaired the growth. Low\|iron cells had a decrease in the quantities of pigment content (chlorophyll and phycocyanin content),the whole cell in vivo absorbance spectra confirmed the decrease, the protein electrophoretic profiles revealed that iron\|deficient cells had less protein bands, with the increase of 2,2′\|Dipyridyl ,the protein bands was more and more less. And differently, iron deficiency also caused an increase of ROS (Reactive Oxygen Species)and SOD activity, it suggests that iron deficiency led to oxidative stress, which generally occured under high\|iron conditions.
文摘Cassava (Manihot esculenta Cranzt) is an important food security crop for poor rural communities particularly in Africa. However, little is known about variability of critical root nutritional and quality traits of African cassava germplasm. Cassava roots contain low levels of important micronutrients and its quality can be influenced by the levels of cyanogenic glucosides. Roots from fourteen accessions comprising Kenyan local landraces and improved clones were screened for their nutritional traits including the contents of cyanogenic glycosides, protein and the micro nutrients iron and zinc. Trait stability and the effects of the environment on the expression of the nutritional traits were evaluated using various genotype (G) by environment (E) interaction study models. There were significant (p ≤ 0.05) differences for all the nutritional traits in the three test sites of Baringo, Kericho and Nakuru in Kenya. Contents of cyanogenic glycosides in both roots and leaves, total root proteins, root iron and zinc ranged from 31.8 ppm to 90.8 ppm;20.8 ppm to 154.4 ppm;1.15% to 3.47%;17.81 ppm to 59.69 ppm and 39.39 ppm to 118 ppm, respectively. The sites were also significantly (p ≤ 0.05) different from each other with the highest cyanogenic content in leaves and roots expressed at the Nakuru site. Regression analysis was used to assess genotype response to environments. Regression coefficients (bi) obtained ranged from 0.13 to 2.23 for all traits combined indicating wide variability in quality trait among the test germplasm. Analysis for sensitivity to environmental change SEi2 revealed that cassava genotypes differed in their level of sensitivity. The root cyanide trait had the highest mean SEi2 which indicated that it was the least stable quality trait in the cassava germplasm. This implies that the same cassava genotypes will give food of different quality depending on growing environment. The observed values for protein and mineral contents suggest the potential for improving the nutritive value of local cassava germplasm.
