Selective brain hypothermia is considered an effective treatment for neuronal injury after stroke,and avoids the complications of general hypothermia.However,the mechanisms by which selective brain hypothermia affects...Selective brain hypothermia is considered an effective treatment for neuronal injury after stroke,and avoids the complications of general hypothermia.However,the mechanisms by which selective brain hypothermia affects mitochondrial fission remain unknown.In this study,we investigated the effect of selective brain hypothermia on the expression of fission 1 (Fis1) protein,a key factor in the mitochondrial fission system,during focal cerebral ischemia/reperfusion injury.Sprague-Dawley rats were divided into four groups.In the sham group,the carotid arteries were exposed only.In the other three groups,middle cerebral artery occlusion was performed using the intraluminal filament technique.After 2 hours of occlusion,the filament was slowly removed to allow blood reperfusion in the ischemia/reperfusion group.Saline,at 4℃ and 37℃,were perfused through the carotid artery in the hypothermia and normothermia groups,respectively,followed by restoration of blood flow.Neurological function was assessed with the Zea Longa 5-point scoring method.Cerebral infarct volume was assessed by 2,3,5-triphenyltetrazolium chloride staining,and apoptosis was assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling staining.Fis1 and cytosolic cytochrome c levels were assessed by western blot assay.Fis1 mRNA expression was assessed by quantitative reverse transcription-polymerase chain reaction.Mitochondrial ultrastructure was evaluated by transmission electron microscopy.Compared with the sham group,apoptosis,Fis1 protein and mRNA expression and cytosolic cytochrome c levels in the cortical ischemic penumbra and cerebral infarct volume were increased after reperfusion in the other three groups.These changes caused by cerebral ischemia/reperfusion were inhibited in the hypothermia group compared with the normothermia group.These findings show that selective brain hypothermia inhibits Fis1 expression and reduces apoptosis,thereby ameliorating focal cerebral ischemia/reperfusion injury in rats.Experiments were authorized by the Ethics Committee of Qingdao Municipal Hospital of China (approval No.2019008).展开更多
目的利用生物信息学的方法分析细粒棘球绦虫Fis1(EgFis1)蛋白的抗原表位,为分子肽疫苗的研发奠定理论基础。方法在NCBI数据库中检所并下载EgFis1蛋白的氨基酸序列;利用EXpasy软件预测蛋白的理化性质;采用SignalP5.0和TMHMM sever 2.0软...目的利用生物信息学的方法分析细粒棘球绦虫Fis1(EgFis1)蛋白的抗原表位,为分子肽疫苗的研发奠定理论基础。方法在NCBI数据库中检所并下载EgFis1蛋白的氨基酸序列;利用EXpasy软件预测蛋白的理化性质;采用SignalP5.0和TMHMM sever 2.0软件预测EgFis1蛋白的信号肽和跨膜结构域;利用SOPMA和SWISS-MODLE预测EgFis1蛋白的二级结构和三级结构;采用IEDB、ABCpred和SYFPEITHI数据库预测EgFis1蛋白的T、B细胞表位。结果细粒棘球绦虫EgFis1是由157个氨基酸组成的等电点为5.86,分子质量单位为16.93ku的蛋白质;不含有信号肽序列,但具有一个跨膜结构域;其二级结构中α-螺旋占比例为48.41%,延伸连占19.11%,β-转角占7.01%,无规则卷曲占25.48%。亲水性较强的区域主要位于12aa-24aa,42aa-52aa,64aa-69aa,81aa-90aa,97aa-105aa,126aa-150aa。Eg-Fis1含有3个优势B细胞表位,7个T细胞表位以及2个T、B联合表位。结论生物信息学方法预测EgFis1蛋白含有4个优势B细胞表位、7个T细胞表位以及2个T、B联合表位,可作为免疫治疗和药物治疗的靶点。展开更多
基金supported by the Natural Science Foundation of Shandong Province of China,No.ZR2015HM023(to MSW)the Science and Technology Plan Project of Qingdao City of China,No.19-6-1-50-nsh(to MSW)
文摘Selective brain hypothermia is considered an effective treatment for neuronal injury after stroke,and avoids the complications of general hypothermia.However,the mechanisms by which selective brain hypothermia affects mitochondrial fission remain unknown.In this study,we investigated the effect of selective brain hypothermia on the expression of fission 1 (Fis1) protein,a key factor in the mitochondrial fission system,during focal cerebral ischemia/reperfusion injury.Sprague-Dawley rats were divided into four groups.In the sham group,the carotid arteries were exposed only.In the other three groups,middle cerebral artery occlusion was performed using the intraluminal filament technique.After 2 hours of occlusion,the filament was slowly removed to allow blood reperfusion in the ischemia/reperfusion group.Saline,at 4℃ and 37℃,were perfused through the carotid artery in the hypothermia and normothermia groups,respectively,followed by restoration of blood flow.Neurological function was assessed with the Zea Longa 5-point scoring method.Cerebral infarct volume was assessed by 2,3,5-triphenyltetrazolium chloride staining,and apoptosis was assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling staining.Fis1 and cytosolic cytochrome c levels were assessed by western blot assay.Fis1 mRNA expression was assessed by quantitative reverse transcription-polymerase chain reaction.Mitochondrial ultrastructure was evaluated by transmission electron microscopy.Compared with the sham group,apoptosis,Fis1 protein and mRNA expression and cytosolic cytochrome c levels in the cortical ischemic penumbra and cerebral infarct volume were increased after reperfusion in the other three groups.These changes caused by cerebral ischemia/reperfusion were inhibited in the hypothermia group compared with the normothermia group.These findings show that selective brain hypothermia inhibits Fis1 expression and reduces apoptosis,thereby ameliorating focal cerebral ischemia/reperfusion injury in rats.Experiments were authorized by the Ethics Committee of Qingdao Municipal Hospital of China (approval No.2019008).
文摘目的利用生物信息学的方法分析细粒棘球绦虫Fis1(EgFis1)蛋白的抗原表位,为分子肽疫苗的研发奠定理论基础。方法在NCBI数据库中检所并下载EgFis1蛋白的氨基酸序列;利用EXpasy软件预测蛋白的理化性质;采用SignalP5.0和TMHMM sever 2.0软件预测EgFis1蛋白的信号肽和跨膜结构域;利用SOPMA和SWISS-MODLE预测EgFis1蛋白的二级结构和三级结构;采用IEDB、ABCpred和SYFPEITHI数据库预测EgFis1蛋白的T、B细胞表位。结果细粒棘球绦虫EgFis1是由157个氨基酸组成的等电点为5.86,分子质量单位为16.93ku的蛋白质;不含有信号肽序列,但具有一个跨膜结构域;其二级结构中α-螺旋占比例为48.41%,延伸连占19.11%,β-转角占7.01%,无规则卷曲占25.48%。亲水性较强的区域主要位于12aa-24aa,42aa-52aa,64aa-69aa,81aa-90aa,97aa-105aa,126aa-150aa。Eg-Fis1含有3个优势B细胞表位,7个T细胞表位以及2个T、B联合表位。结论生物信息学方法预测EgFis1蛋白含有4个优势B细胞表位、7个T细胞表位以及2个T、B联合表位,可作为免疫治疗和药物治疗的靶点。
