多种酰基辅酶A脱氢酶缺陷(Multiple acyl CoA dehydrogenase deficiency,MADD)是一种罕见的脂肪酸、氨基酸和胆碱代谢异常的常染色体隐性遗传病,由电子转移黄素蛋白或电子转移黄素蛋白脱氢酶的基因缺陷引起。迟发型MADD患者大多具有ETFD...多种酰基辅酶A脱氢酶缺陷(Multiple acyl CoA dehydrogenase deficiency,MADD)是一种罕见的脂肪酸、氨基酸和胆碱代谢异常的常染色体隐性遗传病,由电子转移黄素蛋白或电子转移黄素蛋白脱氢酶的基因缺陷引起。迟发型MADD患者大多具有ETFDH突变,可出现近端肌肉无力和远端感觉神经病变,对核黄素治疗反应较好。主要机制可能是ETFDH突变导致线粒体中的电子传递链异常,从而无法在线粒体膜中产生能量。核黄素可以减少ETF/ETF-QO蛋白的异常表达,改善患者的发病状况,是理想的治疗方案。但目前对核黄素无反应的MADD患者的发病机制和治疗方案尚不清楚。展开更多
AIM： To test the hypothesis that the variant UDP- glucuronosyltransferase 1A1 （UGT1A1） gene, glucose-6- phosphate dehydrogenase （G6PD） deficiency, and thalassemia influence bilirubin metabolism and play a role in...AIM： To test the hypothesis that the variant UDP- glucuronosyltransferase 1A1 （UGT1A1） gene, glucose-6- phosphate dehydrogenase （G6PD） deficiency, and thalassemia influence bilirubin metabolism and play a role in the development of cholelithiasis. METHODS： A total of 372 Taiwan Chinese with cholelithiasis who had undergone cholecystectomy and 293 healthy individuals were divided into case and control groups, respectively. PCR and restriction fragment length polymorphism were used to analyze the promoter area and nucleotides 211, 686, 1 091, and 1 456 of the UGT1A1 gene for all subjects and the gene variants for thalassemia and G6PD deficiency. RESULTS： Variation frequencies for the cholelithiasis patients were 16.1%, 25.8%, 5.4%, and 4.3% for A（TA）6 TAA/A（TA）TTAA （6/7）, heterozygosity within the coding region, compound heterozygosity, and homozygosity of the UGT1A1 gene, respectively. Comparing the case and control groups, a statistically significant difference in frequency was demonstrated for the homozygous variation of the UGT1A1 gene （P = 0.012, Z2 test）, but not for the other variations. Further, no difference was demonstrated in a between-group comparison of the incidence of G6PD deficiency and thalassemia （2.7% vs 2.4% and 5.1% vs 5.1%, respectively）. The bilirubin levels for the cholelithiasis patients with the homozygous variant-UGT1A1 gene were significantly different from the control analog （18.0±6.5 and 12.7±2.9 μmol/L, respectively; P〈0.001, Student＇s ttest）.CONCLUSION： Our results show that the homozygous variation in the UGT1A1 gene is a risk factor for the development of cholelithiasis in Taiwan Chinese. 2005 The WJG Press and Elsevier Inc. All rights reserved展开更多
The design of non-noble metal heterogeneous catalyst with superior performance for selective hydrogenation or transfer hydrogenation of nitroarenes to amines is significant but challenging.Herein,a single-atom Fe supp...The design of non-noble metal heterogeneous catalyst with superior performance for selective hydrogenation or transfer hydrogenation of nitroarenes to amines is significant but challenging.Herein,a single-atom Fe supported by nitrogen-doped carbon(Fe_(1)/N-C)catalyst is reported.The Fe_(1)/N-C sample shows superior performances for the selective hydrogenation and transfer hydrogenation of nitrobenzene to aniline at different temperatures.Density functional theory(DFT)calculations show that the superior catalytic activity for the selective hydrogenation at lower temperatures could be attributed to the effective activation of the reactant and intermediates by the Fe_(1)/N-C.Moreover,the excellent performance of Fe_(1)/N-C for the selective transfer hydrogenation could be attributed to that the reaction energy barrier for dehydrogenation of isopropanol can be overcome by elevated temperatures.展开更多
文摘多种酰基辅酶A脱氢酶缺陷(Multiple acyl CoA dehydrogenase deficiency,MADD)是一种罕见的脂肪酸、氨基酸和胆碱代谢异常的常染色体隐性遗传病,由电子转移黄素蛋白或电子转移黄素蛋白脱氢酶的基因缺陷引起。迟发型MADD患者大多具有ETFDH突变,可出现近端肌肉无力和远端感觉神经病变,对核黄素治疗反应较好。主要机制可能是ETFDH突变导致线粒体中的电子传递链异常,从而无法在线粒体膜中产生能量。核黄素可以减少ETF/ETF-QO蛋白的异常表达,改善患者的发病状况,是理想的治疗方案。但目前对核黄素无反应的MADD患者的发病机制和治疗方案尚不清楚。
基金Supported by a grant from the Cathay Medical Research Center, Taipei, Taiwan, China
文摘AIM： To test the hypothesis that the variant UDP- glucuronosyltransferase 1A1 （UGT1A1） gene, glucose-6- phosphate dehydrogenase （G6PD） deficiency, and thalassemia influence bilirubin metabolism and play a role in the development of cholelithiasis. METHODS： A total of 372 Taiwan Chinese with cholelithiasis who had undergone cholecystectomy and 293 healthy individuals were divided into case and control groups, respectively. PCR and restriction fragment length polymorphism were used to analyze the promoter area and nucleotides 211, 686, 1 091, and 1 456 of the UGT1A1 gene for all subjects and the gene variants for thalassemia and G6PD deficiency. RESULTS： Variation frequencies for the cholelithiasis patients were 16.1%, 25.8%, 5.4%, and 4.3% for A（TA）6 TAA/A（TA）TTAA （6/7）, heterozygosity within the coding region, compound heterozygosity, and homozygosity of the UGT1A1 gene, respectively. Comparing the case and control groups, a statistically significant difference in frequency was demonstrated for the homozygous variation of the UGT1A1 gene （P = 0.012, Z2 test）, but not for the other variations. Further, no difference was demonstrated in a between-group comparison of the incidence of G6PD deficiency and thalassemia （2.7% vs 2.4% and 5.1% vs 5.1%, respectively）. The bilirubin levels for the cholelithiasis patients with the homozygous variant-UGT1A1 gene were significantly different from the control analog （18.0±6.5 and 12.7±2.9 μmol/L, respectively; P〈0.001, Student＇s ttest）.CONCLUSION： Our results show that the homozygous variation in the UGT1A1 gene is a risk factor for the development of cholelithiasis in Taiwan Chinese. 2005 The WJG Press and Elsevier Inc. All rights reserved
基金the National Key R&D Program of China(2018YFA0702003)the National Natural Science Foundation of China(21890383,21671117,21871159 and21901135)the Science and Technology Key Project of Guangdong Province of China(2020B010188002)。
文摘The design of non-noble metal heterogeneous catalyst with superior performance for selective hydrogenation or transfer hydrogenation of nitroarenes to amines is significant but challenging.Herein,a single-atom Fe supported by nitrogen-doped carbon(Fe_(1)/N-C)catalyst is reported.The Fe_(1)/N-C sample shows superior performances for the selective hydrogenation and transfer hydrogenation of nitrobenzene to aniline at different temperatures.Density functional theory(DFT)calculations show that the superior catalytic activity for the selective hydrogenation at lower temperatures could be attributed to the effective activation of the reactant and intermediates by the Fe_(1)/N-C.Moreover,the excellent performance of Fe_(1)/N-C for the selective transfer hydrogenation could be attributed to that the reaction energy barrier for dehydrogenation of isopropanol can be overcome by elevated temperatures.
