目的:观察天麻钩藤饮对血管紧张素Ⅱ(AngⅡ)致人脐静脉内皮细胞(HUVECs)损伤的保护作用。方法:制备大鼠天麻钩藤饮含药血清。采用酶消化法体外培养HUVECs,利用Human von Willebrand factor免疫细胞化学法鉴定,随机分为3组:对照组,AngⅡ...目的:观察天麻钩藤饮对血管紧张素Ⅱ(AngⅡ)致人脐静脉内皮细胞(HUVECs)损伤的保护作用。方法:制备大鼠天麻钩藤饮含药血清。采用酶消化法体外培养HUVECs,利用Human von Willebrand factor免疫细胞化学法鉴定,随机分为3组:对照组,AngⅡ组,AngⅡ+天麻钩藤饮组。倒置显微镜下观察细胞形态、密度,酶联免疫法测定细胞上清TNF-α含量,RT-PCR法测定细胞PPAR-γmRNA的表达。结果:与对照组比较,AngⅡ(10-6mol/L)可引起内皮细胞密度降低,细胞分泌TNF-α增加,PPAR-γmRNA表达水平降低。天麻钩藤饮含药血清可抑制AngⅡ导致的细胞损伤,减少TNF-α的分泌,升高PPAR-γmRNA的表达。结论:天麻钩藤饮可对抗AngⅡ所致的HUVECs损伤,保护血管内皮细胞功能。展开更多
目的在先天性动眼神经麻痹家系中定位相关致病基因并克隆该基因。方法对1个先天性动眼神经麻痹家系(3代共16人)通过血液基因组提取和微卫星连锁分析寻找基因突变所在区域,计算有利连锁优势比的对数值(log-arithm of the odds of linkage...目的在先天性动眼神经麻痹家系中定位相关致病基因并克隆该基因。方法对1个先天性动眼神经麻痹家系(3代共16人)通过血液基因组提取和微卫星连锁分析寻找基因突变所在区域,计算有利连锁优势比的对数值(log-arithm of the odds of linkage,LOD),并对该区域内的可能致病基因进行突变筛选和突变验证。结果微卫星标记连锁分析发现位于12p11-12p12区域的D12S85和D12S345区域显示与该家系疾病紧密连锁,LOD值为2.4。对家系KIF21A基因全部外显子进行的突变检测分析显示21号外显子存在c.2680C>T(p.Arg954Trp)的碱基改变。结论 KIF21A基因c.2680C>T(p.Arg954Trp)突变是导致该先天性动眼神经麻痹的致病因素。展开更多
The distribution of repetitive DNAs along chromosomes is one of the crucial elements for understanding the organization and the evolution of plant genomes. Using a modified genomic in situ hybridization （GISH） proce...The distribution of repetitive DNAs along chromosomes is one of the crucial elements for understanding the organization and the evolution of plant genomes. Using a modified genomic in situ hybridization （GISH） procedure, fluorescence in situ hybridization （FISH） with genomic DNA to their own chromosomes （called self-genomic in situ hybridization, self-GISH） was carried out in six selected plant species with different genome size and amount of repetitive DNA. Nonuniform distribution of the fluorescent labeled probe DNA was observed on the chromosomes of all the species that were tested. The signal patterns varied among species and were related to the genome size. The chromosomes of the small Arabidopsis genome were labeled almost only in the pericentromeric regions and the nucleolus organizer regions （NORs）. The signals in the relatively small genomes, rice, sorghum, and Brassica oleracea var. capitata L., were dispersed along the chromosome lengths, with a predominant distribution in the pericentromeric or proximal regions and some heterochromatic arms. All chromosomes of the large genomes, maize and barley, were densely labeled with strongly labeled regions and weakly labeled or unlabeled regions being arranged alternatively throughout the lengths. In addition, enhanced signal bands were shown in all pericentromeres and the NORs in B. oleracea var. capitata, and in all pericentromeric regions and certain intercalary sites in barley. The enhanced signal band pattern in barley was found consistent with the N-banding pattern of this species. The GISH with self-genomic DNA was compared with FISH with Cot-1 DNA in rice, and their signal patterns are found to be basically consistent. Our results showed that the self-GISH signals actually reflected the hybridization of genomic repetitive DNAs to the chromosomes, thus the self-GISH technique would be useful for revealing the distribution of the regions where repetitive DNAs concentrate along chromosomes and some chromatin differentiation associated with repetitive DNAs in plants.展开更多
文摘目的:观察天麻钩藤饮对血管紧张素Ⅱ(AngⅡ)致人脐静脉内皮细胞(HUVECs)损伤的保护作用。方法:制备大鼠天麻钩藤饮含药血清。采用酶消化法体外培养HUVECs,利用Human von Willebrand factor免疫细胞化学法鉴定,随机分为3组:对照组,AngⅡ组,AngⅡ+天麻钩藤饮组。倒置显微镜下观察细胞形态、密度,酶联免疫法测定细胞上清TNF-α含量,RT-PCR法测定细胞PPAR-γmRNA的表达。结果:与对照组比较,AngⅡ(10-6mol/L)可引起内皮细胞密度降低,细胞分泌TNF-α增加,PPAR-γmRNA表达水平降低。天麻钩藤饮含药血清可抑制AngⅡ导致的细胞损伤,减少TNF-α的分泌,升高PPAR-γmRNA的表达。结论:天麻钩藤饮可对抗AngⅡ所致的HUVECs损伤,保护血管内皮细胞功能。
文摘目的在先天性动眼神经麻痹家系中定位相关致病基因并克隆该基因。方法对1个先天性动眼神经麻痹家系(3代共16人)通过血液基因组提取和微卫星连锁分析寻找基因突变所在区域,计算有利连锁优势比的对数值(log-arithm of the odds of linkage,LOD),并对该区域内的可能致病基因进行突变筛选和突变验证。结果微卫星标记连锁分析发现位于12p11-12p12区域的D12S85和D12S345区域显示与该家系疾病紧密连锁,LOD值为2.4。对家系KIF21A基因全部外显子进行的突变检测分析显示21号外显子存在c.2680C>T(p.Arg954Trp)的碱基改变。结论 KIF21A基因c.2680C>T(p.Arg954Trp)突变是导致该先天性动眼神经麻痹的致病因素。
基金This work was supported by the National Natural Sciences Foundation of China (No. 39870423).
文摘The distribution of repetitive DNAs along chromosomes is one of the crucial elements for understanding the organization and the evolution of plant genomes. Using a modified genomic in situ hybridization （GISH） procedure, fluorescence in situ hybridization （FISH） with genomic DNA to their own chromosomes （called self-genomic in situ hybridization, self-GISH） was carried out in six selected plant species with different genome size and amount of repetitive DNA. Nonuniform distribution of the fluorescent labeled probe DNA was observed on the chromosomes of all the species that were tested. The signal patterns varied among species and were related to the genome size. The chromosomes of the small Arabidopsis genome were labeled almost only in the pericentromeric regions and the nucleolus organizer regions （NORs）. The signals in the relatively small genomes, rice, sorghum, and Brassica oleracea var. capitata L., were dispersed along the chromosome lengths, with a predominant distribution in the pericentromeric or proximal regions and some heterochromatic arms. All chromosomes of the large genomes, maize and barley, were densely labeled with strongly labeled regions and weakly labeled or unlabeled regions being arranged alternatively throughout the lengths. In addition, enhanced signal bands were shown in all pericentromeres and the NORs in B. oleracea var. capitata, and in all pericentromeric regions and certain intercalary sites in barley. The enhanced signal band pattern in barley was found consistent with the N-banding pattern of this species. The GISH with self-genomic DNA was compared with FISH with Cot-1 DNA in rice, and their signal patterns are found to be basically consistent. Our results showed that the self-GISH signals actually reflected the hybridization of genomic repetitive DNAs to the chromosomes, thus the self-GISH technique would be useful for revealing the distribution of the regions where repetitive DNAs concentrate along chromosomes and some chromatin differentiation associated with repetitive DNAs in plants.
