目的探讨Salubrinal对大鼠脑缺血再灌注模型LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA表达的影响。方法用线栓法建立大鼠大脑中动脉脑缺血(MCAO)缺血再灌注模型。大鼠随机分为假手术组、模型组、Salubrinal组(Sal组),各组又分为再灌6、12、24、72 ...目的探讨Salubrinal对大鼠脑缺血再灌注模型LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA表达的影响。方法用线栓法建立大鼠大脑中动脉脑缺血(MCAO)缺血再灌注模型。大鼠随机分为假手术组、模型组、Salubrinal组(Sal组),各组又分为再灌6、12、24、72 h 4个亚组。各组于再灌相应时间点行神经功能缺损评分,并断头取脑行HE染色及Real time-PCR检测。结果神经功能缺损:与假手术组比较,模型组、Sal组各时间点均有神经功能缺损(P<0.01);与模型组比较,再灌24、72 h Sal组神经功能缺损评分降低(P<0.05)。HE染色:模型组神经元减少、缺失,细胞肿胀,部分破裂,细胞核固缩、偏移、深染,胶质细胞增生,经Salubrinal干预后,再灌各时间点神经元增多,胞膜较完整,核固缩现象较轻,水肿轻微。Real time-PCR检测:与假手术组比较,模型组、Sal组各指标于再灌各时间点均增高(P<0.01)。与模型组比,Sal组LC3-ⅡmRNA表达于再灌12、24、72 h下降明显(P<0.05);Sal组LC3-Ⅱ/LC3-ⅠmRNA于再灌后各时间点下降均明显(P<0.01)。结论 Salubrinal通过下调LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA比值,对大鼠脑缺血再灌注损伤起保护作用。展开更多
Clock genes are involved in circadian rhythm regulation, and surviving newborns with hypoxic-ischemic encephalopathy may present with sleep-wake cycle reversal. This study aimed to determine the expression of the cloc...Clock genes are involved in circadian rhythm regulation, and surviving newborns with hypoxic-ischemic encephalopathy may present with sleep-wake cycle reversal. This study aimed to determine the expression of the clock genes Clock and Bmall, in the pineal gland of rats with hypoxic-ischemic brain damage. Results showed that levels of Clock mRNA v^re not significantly changed within 48 hours after cerebral hypoxia and ischemia. Expression levels of CLOCK and BMAL1 protein were significantly higher after 48 hours. The levels of Bmall mRNA reached a peak at 36 hours, but were significantly reduced at 48 hours. Experimental findings indicate that Clock and Bmall genes were indeed expressed in the pineal glands of neonatal rats. At the initial stage （within 36 hours） of hypoxic-ischemic brain damage, only slight changes in the expression levels of these two genes were detected, followed by significant changes at 36-48 hours. These changes may be associated with circadian rhythm disorder induced by hypoxic-ischemic brain damage.展开更多
文摘目的探讨Salubrinal对大鼠脑缺血再灌注模型LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA表达的影响。方法用线栓法建立大鼠大脑中动脉脑缺血(MCAO)缺血再灌注模型。大鼠随机分为假手术组、模型组、Salubrinal组(Sal组),各组又分为再灌6、12、24、72 h 4个亚组。各组于再灌相应时间点行神经功能缺损评分,并断头取脑行HE染色及Real time-PCR检测。结果神经功能缺损:与假手术组比较,模型组、Sal组各时间点均有神经功能缺损(P<0.01);与模型组比较,再灌24、72 h Sal组神经功能缺损评分降低(P<0.05)。HE染色:模型组神经元减少、缺失,细胞肿胀,部分破裂,细胞核固缩、偏移、深染,胶质细胞增生,经Salubrinal干预后,再灌各时间点神经元增多,胞膜较完整,核固缩现象较轻,水肿轻微。Real time-PCR检测:与假手术组比较,模型组、Sal组各指标于再灌各时间点均增高(P<0.01)。与模型组比,Sal组LC3-ⅡmRNA表达于再灌12、24、72 h下降明显(P<0.05);Sal组LC3-Ⅱ/LC3-ⅠmRNA于再灌后各时间点下降均明显(P<0.01)。结论 Salubrinal通过下调LC3-ⅡmRNA及LC3-Ⅱ/LC3-ⅠmRNA比值,对大鼠脑缺血再灌注损伤起保护作用。
基金supported by grants from the Foundation for Advancing Medical Sciences of the Health Department, Jiangsu Province, No. Z200519the Project for Social Development of Suzhou, No. SSZ0230
文摘Clock genes are involved in circadian rhythm regulation, and surviving newborns with hypoxic-ischemic encephalopathy may present with sleep-wake cycle reversal. This study aimed to determine the expression of the clock genes Clock and Bmall, in the pineal gland of rats with hypoxic-ischemic brain damage. Results showed that levels of Clock mRNA v^re not significantly changed within 48 hours after cerebral hypoxia and ischemia. Expression levels of CLOCK and BMAL1 protein were significantly higher after 48 hours. The levels of Bmall mRNA reached a peak at 36 hours, but were significantly reduced at 48 hours. Experimental findings indicate that Clock and Bmall genes were indeed expressed in the pineal glands of neonatal rats. At the initial stage （within 36 hours） of hypoxic-ischemic brain damage, only slight changes in the expression levels of these two genes were detected, followed by significant changes at 36-48 hours. These changes may be associated with circadian rhythm disorder induced by hypoxic-ischemic brain damage.
