Charcot-Marie-Tooth disease （CMT）, also known as hereditary motor and sensory neuropathies,comprises a genetically heterogeneous group of inherited peripheral neuropathies. Clinically it is characterized by progress...Charcot-Marie-Tooth disease （CMT）, also known as hereditary motor and sensory neuropathies,comprises a genetically heterogeneous group of inherited peripheral neuropathies. Clinically it is characterized by progressive distal weakness, muscle atrophy, distal sensory loss and loss of deep tendon reflexes. Following electrophysiological criteria, CMT is divided into two main forms：展开更多
In order to evaluate the effect of mitofusin-2 gene （mfn2） on proliferation and chemotherapy sensitivity of human breast carcinoma cell line MCF-7 in vitro, pEGFPmfn2 plasmid carrying full length of mitofusin-2 gene...In order to evaluate the effect of mitofusin-2 gene （mfn2） on proliferation and chemotherapy sensitivity of human breast carcinoma cell line MCF-7 in vitro, pEGFPmfn2 plasmid carrying full length of mitofusin-2 gene was transfected, by using sofast, into MCF-7 cells. Mitofusin-2 gene expression in MCF-7 cells transfected by sofast after 48 h was detected by PCR and Western blotting, and the stable expression of GFP protein in MCF-7 cells by Western blot analysis. The proliferation of MCF-7 cells was assayed by MTT and cell counting. By using PI method, the effects of mfn2 on the cell cycle distribution of MCF-7 were measured. Annexin-Ⅴ/PI double labeling method was employed to detect the changes in apoptosis induced by chemotherapeutics before and after transfection. The results showed that the MCF-7 cells transfected with mfn2 gene could stably and highly express GFP protein. MTT assay revealed that after transfection of mfn2 cDNA, the proliferation of MCF-7 cells was significantly inhibited. DNA histogram showed that cells arrested in S phase, and the percentage of S phase cells was 42.7, 17.2 and 19.6 in mfn2 cDNA transfection group, blank plasmid transfection group and blank control group, respectively （P〈0.05）. The apoptosis ratio of the cells transfected with mfn2 gene was increased from 3.56% to 15.95%, that of the cells treated with camptothecin （CAMP） followed by mfn2 gene transfection was 69.6%, and that in blank plasmid transfection group and blank control group was 31.0% and 23.4% respectively （P〈0.05）. It was suggested that transfection of mfn2 gene could significantly inhibit the proliferation of MCF-7 cells and promote their sensitivity to CAMP with a synergic effect.展开更多
目的研究线粒体融合素基因-2(mitofusin-2,Mfn2)沉默对人肝癌细胞株(HepG2)葡萄糖代谢和胰岛素信号通路分子丝/苏氨酸蛋白激酶(Akt1)的影响。方法构建Mfn2短发夹双链RNA(Mfn2shRNA)和阴性对照短发夹双链RNA(HK),将HepG2细胞株分为空白...目的研究线粒体融合素基因-2(mitofusin-2,Mfn2)沉默对人肝癌细胞株(HepG2)葡萄糖代谢和胰岛素信号通路分子丝/苏氨酸蛋白激酶(Akt1)的影响。方法构建Mfn2短发夹双链RNA(Mfn2shRNA)和阴性对照短发夹双链RNA(HK),将HepG2细胞株分为空白对照组(NC)、阴性对照组(HK)、Mfn2shRNA质粒转染组(Mfn2)。HK和Mfn2组细胞应用lipo-fectamine2000转染HepG2细胞株;采用葡萄糖氧化酶的方法和氚标记葡萄糖(3-3H-Glucose)放射性核素示踪法检测细胞葡萄糖消耗量和摄取率;Western blotting检测Mfn2和Akt1蛋白表达。结果与HK组比较,Mfn2组细胞Mfn2蛋白表达明显下降(0.23±0.05 vs 0.51±0.14,P=0.034),Akt1表达差异无统计学意义(0.13±0.00 vs 0.14±0.01,P=0.055);Mfn2组细胞葡萄糖消耗量明显下降(8.72±0.62 vs 9.75±0.35,P=0.001),葡萄糖摄取率亦显著下降(7.94±0.04 vs 9.64±0.13,P=0.002)。结论抑制Mfn2基因表达导致HepG2细胞葡萄糖代谢下降;Mfn2表达对葡萄糖代谢的影响是否通过PI3K/Akt信号通路介导还需要进一步研究。展开更多
文摘Charcot-Marie-Tooth disease （CMT）, also known as hereditary motor and sensory neuropathies,comprises a genetically heterogeneous group of inherited peripheral neuropathies. Clinically it is characterized by progressive distal weakness, muscle atrophy, distal sensory loss and loss of deep tendon reflexes. Following electrophysiological criteria, CMT is divided into two main forms：
基金a grant of the Clinical Key Subject Foundation from Ministry of Health of China (No. 2004CB518705)
文摘In order to evaluate the effect of mitofusin-2 gene （mfn2） on proliferation and chemotherapy sensitivity of human breast carcinoma cell line MCF-7 in vitro, pEGFPmfn2 plasmid carrying full length of mitofusin-2 gene was transfected, by using sofast, into MCF-7 cells. Mitofusin-2 gene expression in MCF-7 cells transfected by sofast after 48 h was detected by PCR and Western blotting, and the stable expression of GFP protein in MCF-7 cells by Western blot analysis. The proliferation of MCF-7 cells was assayed by MTT and cell counting. By using PI method, the effects of mfn2 on the cell cycle distribution of MCF-7 were measured. Annexin-Ⅴ/PI double labeling method was employed to detect the changes in apoptosis induced by chemotherapeutics before and after transfection. The results showed that the MCF-7 cells transfected with mfn2 gene could stably and highly express GFP protein. MTT assay revealed that after transfection of mfn2 cDNA, the proliferation of MCF-7 cells was significantly inhibited. DNA histogram showed that cells arrested in S phase, and the percentage of S phase cells was 42.7, 17.2 and 19.6 in mfn2 cDNA transfection group, blank plasmid transfection group and blank control group, respectively （P〈0.05）. The apoptosis ratio of the cells transfected with mfn2 gene was increased from 3.56% to 15.95%, that of the cells treated with camptothecin （CAMP） followed by mfn2 gene transfection was 69.6%, and that in blank plasmid transfection group and blank control group was 31.0% and 23.4% respectively （P〈0.05）. It was suggested that transfection of mfn2 gene could significantly inhibit the proliferation of MCF-7 cells and promote their sensitivity to CAMP with a synergic effect.
文摘目的研究线粒体融合素基因-2(mitofusin-2,Mfn2)沉默对人肝癌细胞株(HepG2)葡萄糖代谢和胰岛素信号通路分子丝/苏氨酸蛋白激酶(Akt1)的影响。方法构建Mfn2短发夹双链RNA(Mfn2shRNA)和阴性对照短发夹双链RNA(HK),将HepG2细胞株分为空白对照组(NC)、阴性对照组(HK)、Mfn2shRNA质粒转染组(Mfn2)。HK和Mfn2组细胞应用lipo-fectamine2000转染HepG2细胞株;采用葡萄糖氧化酶的方法和氚标记葡萄糖(3-3H-Glucose)放射性核素示踪法检测细胞葡萄糖消耗量和摄取率;Western blotting检测Mfn2和Akt1蛋白表达。结果与HK组比较,Mfn2组细胞Mfn2蛋白表达明显下降(0.23±0.05 vs 0.51±0.14,P=0.034),Akt1表达差异无统计学意义(0.13±0.00 vs 0.14±0.01,P=0.055);Mfn2组细胞葡萄糖消耗量明显下降(8.72±0.62 vs 9.75±0.35,P=0.001),葡萄糖摄取率亦显著下降(7.94±0.04 vs 9.64±0.13,P=0.002)。结论抑制Mfn2基因表达导致HepG2细胞葡萄糖代谢下降;Mfn2表达对葡萄糖代谢的影响是否通过PI3K/Akt信号通路介导还需要进一步研究。
文摘目的研究阿司匹林对高脂喂养Wistar大鼠胰岛素敏感性和线粒体功能的影响。方法 24只Wistar大鼠,♂,分为对照组(NC)、高脂组(HF)和阿司匹林组(AF)(n=8),喂养8周后,以高胰岛素-正常葡萄糖钳夹测定大鼠胰岛素敏感性,取空腹血清测定大鼠谷草转氨酶(ALT)、谷丙转氨酶(AST)、高密度脂蛋白(HDL-C)、甘油三酯(TG)、空腹血糖(FBS),空腹胰岛素(FINS)的水平;将大鼠肝脏组织进行固定、包埋、切片和HE染色,观察肝脏组织学变化;取肝脏组织,测定肝糖原含量;提取肝细胞线粒体并分离线粒体超氧化物歧化酶,测定线粒体超氧化物歧化酶活性(SOD),以及提取肝组织总RNA,应用RT-PCR测定肝脏组织Mfn2 m RNA的表达。结果与NC组大鼠比较,HF组大鼠肝脏指数、TG、FBS、ALT、AST、INS明显升高(P<0.05),GIR和SOD显著降低(P<0.05),肝脏组织Mfn2 mRNA表达显著降低,肝细胞体积增大,胞质中有脂滴空泡;AF组大鼠上述各指标差异无统计学意义,显微结构无显著变化。结论阿司匹林可以改善高脂诱导的胰岛素抵抗及抑制脂肪肝的形成,这一作用可能是部分通过促进肝细胞Mfn2表达、改善线粒体功能实现的。
