To evaluate the neuroprotective effect of memantine, a non-competitive antagonist at the N-methyl-D-aspartate receptor, against hypoxic ischemia (HI) by exploring its regulation on the expression and synthesis of heat...To evaluate the neuroprotective effect of memantine, a non-competitive antagonist at the N-methyl-D-aspartate receptor, against hypoxic ischemia (HI) by exploring its regulation on the expression and synthesis of heat shock protein 70 (HSP70) gene in neonatal rat models with cerebral HI Methods Memantine was intraperitoneally injected at a dose of 20 mg/kg in neonatal rat models either before (PRE group) or after (POST group) induction of HI The expression and synthesis of the HSP70 gene and its corresponding product were determined by rapid competitive PCR and immunohistochemistry, respectively Results There was an increase in the expression of HSP70 mRNA two hours after induction of HI, which reached its peak at 48 hours, then decreased gradually The same expression occurred at relatively low levels in the control group Also, HSP70 synthesis was detected as early as 2h after HI, reached its peak between 48 and 72 hours, then declined over time After memantine administration, the expression of the gene and its synthesis of the corresponding product decreased significantly during the time intervals 24-72 h for the gene and 48-72 h for the product compared to the HI group Conclusion It was shown that HI is very sensitive to the expression of the HSP70 gene and synthesis of its corresponding product, which could be regulated by memantine The latter may have the ability to reduce brain damage; thus decreased HSP70 mRNA expression could be a marker for HI It is suggested that memantine can be a promising agent for neuroprotection against HI, although an overall and abstract assessment of memantine is required to see if it can be used on neonates clinically later on展开更多
Objective To explore the mechanism of perinatal hypoxia-ischemia encephalopathy, we studied the expression of the c-fos gene and its relationship with delayed neuronal death in a rat model.Methods Cerebral hypoxia-isc...Objective To explore the mechanism of perinatal hypoxia-ischemia encephalopathy, we studied the expression of the c-fos gene and its relationship with delayed neuronal death in a rat model.Methods Cerebral hypoxia-ischemia was produced in 7-day-old SD rats using the Rice model, Reverse transcription PCR (RT-PCR), immunohistochemistry and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) were used to detect the expression of c-fos gene and cell apoptosis in the hippocampus.Results The selective expression of c-fos and delayed cell apoptosis were observed in the hypoxiaischemia hippocampus. Expression of the c-fos gene was seen in the CA4 and cingulate sulcus neurons, and apoptosis was observed in the CA1 neurons.Conclusion Transient expression of the c-fos gene may induce cerebral cell apoptosis, and may have complex relations with delayed cell death.展开更多
目的:通过比较足月缺氧缺血性脑病患儿与正常足月新生儿外周静脉血中淋巴细胞(Peripheral blood lymphocytes cell,PBLC)中钟基因Clock m RNA、Bmal1 m RNA含量水平的变化,研究探讨HIE所致的昼夜节律紊乱中对钟基因的影响。方法:采用半...目的:通过比较足月缺氧缺血性脑病患儿与正常足月新生儿外周静脉血中淋巴细胞(Peripheral blood lymphocytes cell,PBLC)中钟基因Clock m RNA、Bmal1 m RNA含量水平的变化,研究探讨HIE所致的昼夜节律紊乱中对钟基因的影响。方法:采用半定量逆转录聚合酶链反应(Reverse Transcriptase Polymerase Chain Reaction,RT-PCR)测定32例缺氧缺血性脑病患儿(HIE组)与24例正常足月新生儿(对照组)外周血淋巴细胞中Clock m RNA、Bmal1 m RNA的含量,并比较各组之间的差异。结果:HIE组外周血淋巴细胞中Clock m RNA和Bmal1 m RNA的水平均低于对照组,两组比较差异有统计学意义(P<0.05),HIE组外周血淋巴细胞中Clock m RNA、Bmal1 m RNA含量的变化趋势基本一致。结论:HIE患儿PBLC中Clock m RNA、Bmal1 m RNA表达存在异常,两者可能在缺氧缺血后昼夜节律紊乱的发生起着一定的作用。展开更多
基金ThestudywassupportedbyagrantfromtheNationalNaturalScienceFoundationofChina (No 39670 758)
文摘To evaluate the neuroprotective effect of memantine, a non-competitive antagonist at the N-methyl-D-aspartate receptor, against hypoxic ischemia (HI) by exploring its regulation on the expression and synthesis of heat shock protein 70 (HSP70) gene in neonatal rat models with cerebral HI Methods Memantine was intraperitoneally injected at a dose of 20 mg/kg in neonatal rat models either before (PRE group) or after (POST group) induction of HI The expression and synthesis of the HSP70 gene and its corresponding product were determined by rapid competitive PCR and immunohistochemistry, respectively Results There was an increase in the expression of HSP70 mRNA two hours after induction of HI, which reached its peak at 48 hours, then decreased gradually The same expression occurred at relatively low levels in the control group Also, HSP70 synthesis was detected as early as 2h after HI, reached its peak between 48 and 72 hours, then declined over time After memantine administration, the expression of the gene and its synthesis of the corresponding product decreased significantly during the time intervals 24-72 h for the gene and 48-72 h for the product compared to the HI group Conclusion It was shown that HI is very sensitive to the expression of the HSP70 gene and synthesis of its corresponding product, which could be regulated by memantine The latter may have the ability to reduce brain damage; thus decreased HSP70 mRNA expression could be a marker for HI It is suggested that memantine can be a promising agent for neuroprotection against HI, although an overall and abstract assessment of memantine is required to see if it can be used on neonates clinically later on
文摘Objective To explore the mechanism of perinatal hypoxia-ischemia encephalopathy, we studied the expression of the c-fos gene and its relationship with delayed neuronal death in a rat model.Methods Cerebral hypoxia-ischemia was produced in 7-day-old SD rats using the Rice model, Reverse transcription PCR (RT-PCR), immunohistochemistry and terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) were used to detect the expression of c-fos gene and cell apoptosis in the hippocampus.Results The selective expression of c-fos and delayed cell apoptosis were observed in the hypoxiaischemia hippocampus. Expression of the c-fos gene was seen in the CA4 and cingulate sulcus neurons, and apoptosis was observed in the CA1 neurons.Conclusion Transient expression of the c-fos gene may induce cerebral cell apoptosis, and may have complex relations with delayed cell death.
文摘目的:通过比较足月缺氧缺血性脑病患儿与正常足月新生儿外周静脉血中淋巴细胞(Peripheral blood lymphocytes cell,PBLC)中钟基因Clock m RNA、Bmal1 m RNA含量水平的变化,研究探讨HIE所致的昼夜节律紊乱中对钟基因的影响。方法:采用半定量逆转录聚合酶链反应(Reverse Transcriptase Polymerase Chain Reaction,RT-PCR)测定32例缺氧缺血性脑病患儿(HIE组)与24例正常足月新生儿(对照组)外周血淋巴细胞中Clock m RNA、Bmal1 m RNA的含量,并比较各组之间的差异。结果:HIE组外周血淋巴细胞中Clock m RNA和Bmal1 m RNA的水平均低于对照组,两组比较差异有统计学意义(P<0.05),HIE组外周血淋巴细胞中Clock m RNA、Bmal1 m RNA含量的变化趋势基本一致。结论:HIE患儿PBLC中Clock m RNA、Bmal1 m RNA表达存在异常,两者可能在缺氧缺血后昼夜节律紊乱的发生起着一定的作用。
