目的观察丹龙醒脑方对脑缺血再灌注模型大鼠侧脑室室管膜下区(SVZ)神经干细胞(NSCs)增殖与Hes1、Hes5表达的影响,探讨其促进内源性NSCs增殖的作用机制。方法将80只雄性SD大鼠随机分为假手术组、模型组、依达拉奉组(依达组)、丹龙醒脑方...目的观察丹龙醒脑方对脑缺血再灌注模型大鼠侧脑室室管膜下区(SVZ)神经干细胞(NSCs)增殖与Hes1、Hes5表达的影响,探讨其促进内源性NSCs增殖的作用机制。方法将80只雄性SD大鼠随机分为假手术组、模型组、依达拉奉组(依达组)、丹龙醒脑方组(丹龙组)。采用线栓法制备局灶性脑缺血再灌注模型,再灌注7 d后取缺血侧SVZ脑组织。Brdu免疫荧光法检测SVZ NSCs增殖,RT-q PCR、Western blot分别检测Hes1、Hes5 m RNA和蛋白的表达。结果与假手术组比较,其余各组Brdu阳性细胞率增加,Hes1、Hes5 m RNA及蛋白表达明显升高(P<0.01);与模型组比较,依达组、丹龙组Brdu阳性细胞率明显增加,Hes1、Hes5 m RNA及蛋白表达水平明显增强(P<0.01);丹龙组Hes1 m RNA表达水平优于依达组(P<0.01),其余指标均无明显差异。结论丹龙醒脑方可促进脑缺血再灌注后大鼠SVZ NSCs增殖,并上调Hes1、Hes5表达水平,其机制可能与激活Notch信号通路有关。展开更多
目的研究紫草素对Ha Ca T细胞抑制增殖的作用及其作用机制。方法倒置显微镜下观察不同浓度紫草素(0、2、5、10、15μmol/L)作用后Ha Ca T细胞的形态学改变;MTT法检测紫草素对Ha Ca T细胞抑制增殖的作用;流式细胞术检测细胞凋亡率变化;We...目的研究紫草素对Ha Ca T细胞抑制增殖的作用及其作用机制。方法倒置显微镜下观察不同浓度紫草素(0、2、5、10、15μmol/L)作用后Ha Ca T细胞的形态学改变;MTT法检测紫草素对Ha Ca T细胞抑制增殖的作用;流式细胞术检测细胞凋亡率变化;Western blot法检测Notch-1、Jagged1和Hes5蛋白的表达情况。RT-PCR检测下游信号分子Hes1和Hes5的m RNA表达。结果 10μmol/L紫草素即可显著抑制Ha Ca T细胞的增殖,且随着浓度的增加,紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖(均P<0.01)。流式细胞术检测结果显示10μmol/L紫草素能够显著诱导Ha Ca T细胞凋亡(P<0.01)。Western bolt法检测结果显示,Notch-1、Jagged1和Hes5蛋白表达逐渐降低。RT-PCR法检测结果显示,Notch信号通路下游信号分子Hes1和Hes5的m RNA表达水平亦呈剂量依赖性降低。结论紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖,并诱导细胞凋亡,Notch-1信号通路在其中起了重要作用。展开更多
As an inhibitor of the Notch signaling pathway, N-[N-(3,5-difluorohenacetyl)-l-alanyl]-S-phenylglycine tert-butyl ester(DAPT) may protect brain tissue from serious ischemic injury. This study aimed to explore neuropro...As an inhibitor of the Notch signaling pathway, N-[N-(3,5-difluorohenacetyl)-l-alanyl]-S-phenylglycine tert-butyl ester(DAPT) may protect brain tissue from serious ischemic injury. This study aimed to explore neuroprotection by DAPT after cerebral ischemia/reperfusion(I/R) injury. DAPT was intraperitoneally injected 3 hours before the establishment of a focal cerebral I/R model in the right middle cerebral artery of obstructed mice. Longa scores were used to assess neurological changes of mice. Nissl staining and TdT-mediated dUTP-biotin nick-end labeling staining were used to examine neuronal damage and cell apoptosis in the right prefrontal cortex, while immunofluorescence staining was used to detect glial fibrillary acidic protein-and Notch1-positive cells. Protein expression levels of Hes1 and Hes5 were detected by western blot assay in the right prefrontal cortex. Our results demonstrated that DAPT significantly improved neurobehavioral scores and relieved neuronal morphological damage. DAPT decreased the number of glial fibrillary acidic protein-and Notch1-positive cells in the right prefrontal cortex, while also reducing the number of apoptotic cells and decreasing interleukin-6 and tumor necrosis factor-α contents, and simultaneously downregulating Hes1 and Hes5 protein expression. These findings verify that DAPT alleviates pathological lesions and strengthens the anti-inflammatory response after cerebral I/R injury. Thus, DAPT might be developed as an effective drug for the prevention of cerebral I/R injury.展开更多
Objective： To observe the effect of acupuncture on the Notch signaling pathway in rats with traumatic brain injury and to explore the pathogenesis of acupuncture intervention on traumatic brain injury. Methods： Fee...Objective： To observe the effect of acupuncture on the Notch signaling pathway in rats with traumatic brain injury and to explore the pathogenesis of acupuncture intervention on traumatic brain injury. Methods： Feeney＇s freefall epidural impact method was used to establish a traumatic brain injury model in rats; the rats were randomly divided into a normal group, sham operation group, model group and acupuncture group. Acupuncture was performed in the Baihui（DU 20）, Shuigou（DU 26）, Fengfu（DU 16）, Yamen（DU 15） and Hegu（LI 4） acupoints in the rat, and Yamen was punctured via Fengfu. Then, the rats in each group were randomly divided into three subgroups, namely the day 3 subgroup, day 7 subgroup and day 14 subgroup according to treatment duration. The modified neurological severity scores（m Nss） method was used to perform neurobehavioral scoring for evaluating the degree of injury in the rats. The hematoxylin-eosin（HE） staining method was used to observe the pathological change in the brain tissue of rats in each group. Real-time fluorescent quantitative polymerase chain reaction（Q-PCR） technology was used to detect changes in the Notch1, Hes1 and Hes5 gene expression levels in the cortex on the injured side. Western blot was used to detect the protein expression changes. Results： One day after modeling, the m Nss scores in the model group and in the acupuncture group were significantly higher than those in the normal and sham operation groups（P〈0.01）; there was no statistically significant difference between the normal group and the sham operation group. The scores decreased with increased treatment time, and the scores in the acupuncture group decreased more significantly than those in the model group（P〈0.01）. The pathological examination by the HE staining method demonstrated that the brain tissue of the rats in the acupuncture and model groups relatively significantly changed. The Notch1 gene expression level in the acupuncture group was significantly higher than the level in all of the other groups（P〈0.01）; the Hes1 and Hes5 gene expression levels were also higher in the acupuncture group. The expression changes of the Notch1 and Hes1 protein were consistent with that of m RNA. In each experimental group, the m Nss score and the pathological results by the HE staining method were consistent with the m RNA results. Conclusion： Acupuncture could significantly promote high expression levels of Notch1, Hes1 and Hes5 in the brain tissue of traumatic brain injury rats. Therefore, acupuncture might be an important intervention for inducing endogenous stem cell proliferation and for promoting nerve repair.展开更多
文摘目的观察丹龙醒脑方对脑缺血再灌注模型大鼠侧脑室室管膜下区(SVZ)神经干细胞(NSCs)增殖与Hes1、Hes5表达的影响,探讨其促进内源性NSCs增殖的作用机制。方法将80只雄性SD大鼠随机分为假手术组、模型组、依达拉奉组(依达组)、丹龙醒脑方组(丹龙组)。采用线栓法制备局灶性脑缺血再灌注模型,再灌注7 d后取缺血侧SVZ脑组织。Brdu免疫荧光法检测SVZ NSCs增殖,RT-q PCR、Western blot分别检测Hes1、Hes5 m RNA和蛋白的表达。结果与假手术组比较,其余各组Brdu阳性细胞率增加,Hes1、Hes5 m RNA及蛋白表达明显升高(P<0.01);与模型组比较,依达组、丹龙组Brdu阳性细胞率明显增加,Hes1、Hes5 m RNA及蛋白表达水平明显增强(P<0.01);丹龙组Hes1 m RNA表达水平优于依达组(P<0.01),其余指标均无明显差异。结论丹龙醒脑方可促进脑缺血再灌注后大鼠SVZ NSCs增殖,并上调Hes1、Hes5表达水平,其机制可能与激活Notch信号通路有关。
文摘目的研究紫草素对Ha Ca T细胞抑制增殖的作用及其作用机制。方法倒置显微镜下观察不同浓度紫草素(0、2、5、10、15μmol/L)作用后Ha Ca T细胞的形态学改变;MTT法检测紫草素对Ha Ca T细胞抑制增殖的作用;流式细胞术检测细胞凋亡率变化;Western blot法检测Notch-1、Jagged1和Hes5蛋白的表达情况。RT-PCR检测下游信号分子Hes1和Hes5的m RNA表达。结果 10μmol/L紫草素即可显著抑制Ha Ca T细胞的增殖,且随着浓度的增加,紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖(均P<0.01)。流式细胞术检测结果显示10μmol/L紫草素能够显著诱导Ha Ca T细胞凋亡(P<0.01)。Western bolt法检测结果显示,Notch-1、Jagged1和Hes5蛋白表达逐渐降低。RT-PCR法检测结果显示,Notch信号通路下游信号分子Hes1和Hes5的m RNA表达水平亦呈剂量依赖性降低。结论紫草素呈剂量依赖性地抑制Ha Ca T细胞的增殖,并诱导细胞凋亡,Notch-1信号通路在其中起了重要作用。
基金supported by the National Natural Science Foundation of China,No.81660243(to JDZ)a grant from the Social Development Science and Technology Plan Project of Science and Technology Department of Guizhou Province of China,No.SY [2015] 3041(to JDZ)a grant from the Science and Technology Department of Guizhou Province of China,No.LG [2012] 028(to JDZ)
文摘As an inhibitor of the Notch signaling pathway, N-[N-(3,5-difluorohenacetyl)-l-alanyl]-S-phenylglycine tert-butyl ester(DAPT) may protect brain tissue from serious ischemic injury. This study aimed to explore neuroprotection by DAPT after cerebral ischemia/reperfusion(I/R) injury. DAPT was intraperitoneally injected 3 hours before the establishment of a focal cerebral I/R model in the right middle cerebral artery of obstructed mice. Longa scores were used to assess neurological changes of mice. Nissl staining and TdT-mediated dUTP-biotin nick-end labeling staining were used to examine neuronal damage and cell apoptosis in the right prefrontal cortex, while immunofluorescence staining was used to detect glial fibrillary acidic protein-and Notch1-positive cells. Protein expression levels of Hes1 and Hes5 were detected by western blot assay in the right prefrontal cortex. Our results demonstrated that DAPT significantly improved neurobehavioral scores and relieved neuronal morphological damage. DAPT decreased the number of glial fibrillary acidic protein-and Notch1-positive cells in the right prefrontal cortex, while also reducing the number of apoptotic cells and decreasing interleukin-6 and tumor necrosis factor-α contents, and simultaneously downregulating Hes1 and Hes5 protein expression. These findings verify that DAPT alleviates pathological lesions and strengthens the anti-inflammatory response after cerebral I/R injury. Thus, DAPT might be developed as an effective drug for the prevention of cerebral I/R injury.
基金Supported by the National Natural Science Foundation of China(No.81273827)the Project of Science and Technology of Guangdong,China(No.2011B031800284)the Science and Technology Program of Guangzhou,China(No.2010GN-E00221)
文摘Objective： To observe the effect of acupuncture on the Notch signaling pathway in rats with traumatic brain injury and to explore the pathogenesis of acupuncture intervention on traumatic brain injury. Methods： Feeney＇s freefall epidural impact method was used to establish a traumatic brain injury model in rats; the rats were randomly divided into a normal group, sham operation group, model group and acupuncture group. Acupuncture was performed in the Baihui（DU 20）, Shuigou（DU 26）, Fengfu（DU 16）, Yamen（DU 15） and Hegu（LI 4） acupoints in the rat, and Yamen was punctured via Fengfu. Then, the rats in each group were randomly divided into three subgroups, namely the day 3 subgroup, day 7 subgroup and day 14 subgroup according to treatment duration. The modified neurological severity scores（m Nss） method was used to perform neurobehavioral scoring for evaluating the degree of injury in the rats. The hematoxylin-eosin（HE） staining method was used to observe the pathological change in the brain tissue of rats in each group. Real-time fluorescent quantitative polymerase chain reaction（Q-PCR） technology was used to detect changes in the Notch1, Hes1 and Hes5 gene expression levels in the cortex on the injured side. Western blot was used to detect the protein expression changes. Results： One day after modeling, the m Nss scores in the model group and in the acupuncture group were significantly higher than those in the normal and sham operation groups（P〈0.01）; there was no statistically significant difference between the normal group and the sham operation group. The scores decreased with increased treatment time, and the scores in the acupuncture group decreased more significantly than those in the model group（P〈0.01）. The pathological examination by the HE staining method demonstrated that the brain tissue of the rats in the acupuncture and model groups relatively significantly changed. The Notch1 gene expression level in the acupuncture group was significantly higher than the level in all of the other groups（P〈0.01）; the Hes1 and Hes5 gene expression levels were also higher in the acupuncture group. The expression changes of the Notch1 and Hes1 protein were consistent with that of m RNA. In each experimental group, the m Nss score and the pathological results by the HE staining method were consistent with the m RNA results. Conclusion： Acupuncture could significantly promote high expression levels of Notch1, Hes1 and Hes5 in the brain tissue of traumatic brain injury rats. Therefore, acupuncture might be an important intervention for inducing endogenous stem cell proliferation and for promoting nerve repair.
