Inhibition of Notch1 signaling has been shown to promote astrocyte-derived neurogenesis after stroke.To investigate the regulatory role of Notch1 signaling in this process,in this study,we used a rat model of stroke b...Inhibition of Notch1 signaling has been shown to promote astrocyte-derived neurogenesis after stroke.To investigate the regulatory role of Notch1 signaling in this process,in this study,we used a rat model of stroke based on middle cerebral artery occlusion and assessed the behavior of reactive astrocytes post-stroke.We used theγ-secretase inhibitor N-[N-(3,5-diuorophenacetyl)-1-alanyl]-S-phenylglycine t-butylester(DAPT)to block Notch1 signaling at 1,4,and 7 days after injury.Our results showed that only administration of DAPT at 4 days after stroke promoted astrocyte-derived neurogenesis,as manifested by recovery of white matter fiber bundle integrity on magnetic resonance imaging,which is consistent with recovery of neurologic function.These findings suggest that inhibition of Notch1 signaling at the subacute stage post-stroke mediates neural repair by promoting astrocyte-derived neurogenesis.展开更多
目的探讨果蝇双翅边缘缺刻同源基因(Notch)信号通路在慢性阻塞性肺疾病(COPD)辅助性T细胞1(Helper T cells 1,Th1)和辅助性T细胞2(Helper T cells 2,Th2)失衡中的作用及芪蛭皱肺颗粒的干预机制。方法70只Wistar大鼠随机挑选10只作为空...目的探讨果蝇双翅边缘缺刻同源基因(Notch)信号通路在慢性阻塞性肺疾病(COPD)辅助性T细胞1(Helper T cells 1,Th1)和辅助性T细胞2(Helper T cells 2,Th2)失衡中的作用及芪蛭皱肺颗粒的干预机制。方法70只Wistar大鼠随机挑选10只作为空白对照组,其余大鼠均采用香烟烟雾(CS)联合气管滴注脂多糖(Lipopolysaccharide,LPS)法建立COPD模型,空白对照组及造模组各随机挑选3只大鼠验证造模是否成功。造模结束进行灌胃给药干预,造模组大鼠随机分为模型对照组、阳性对照组(67.5μg·kg^(-1))及芪蛭皱肺颗粒高中低剂量组(3.24、1.62、0.81 g·kg^(-1)),分别给予生理盐水、醋酸地塞米松混悬液、芪蛭皱肺高、中、低剂量混悬液进行灌胃干预,空白对照组同模型对照组,灌胃等体积生理盐水。经28天造模及28天治疗后,采用动物肺功能测试系统检测吸气峰流速(Peak Inspiratory Flow,PIF)和呼气峰流速(Peak Expiratory Flow,PEF),处死大鼠提取肺脏、脾脏、血清及支气管肺泡灌洗液(BALF),苏木素-伊红(HE)染色评价肺组织病理变化,酶联免疫吸附实验法(ELISA)测定血清及BALF中肿瘤坏死因子-α(TNF-α)含量,流式细胞仪检测脾脏Th1/Th2细胞水平,免疫组织化学法(Immunohistochemistry,IHC)及蛋白免疫印迹法(Western blot)检测肺组织Notch1、Hes家族发状分裂相关增强子1(Hes1)、Hey家族发状分裂相关增强子1(Hey1)蛋白水平,实时荧光定量聚合酶链式反应(Real-time PCR,RT-PCR)检测肺组织Notch1、Hes1、Hey1基因表达水平。结果与空白对照组比较,模型对照组大鼠肺功能显著降低(P<0.05),肺组织出现炎性细胞浸润、支气管结构破坏等病变,血清及BALF中TNF-α含量显著升高(P<0.05),脾Th1细胞百分比显著降低(P<0.05),Th2细胞百分比显著升高(P<0.05),肺组织Notch1、Hes1、Hey1蛋白及mRNA表达显著升高(P<0.05),差异均具有统计学意义;与模型对照组比较,各给药组大鼠肺功能显著升高(P<0.05),肺组织病理损伤均有所减轻,血清及BALF中TNF-α含量显著降低(P<0.05),脾Th1细胞百分比显著升高(P<0.05),Th2细胞百分比显著降低(P<0.05),肺组织Notch1、Hes1、Hey1蛋白及mRNA表达显著降低(P<0.05),差异均具有统计学意义。结论芪蛭皱肺颗粒通过抑制Notch信号通路调节Th1/Th2平衡,从而改善COPD大鼠肺功能及病理损伤,影响其免疫功能。展开更多
Protective effect of catalpol on myocardium was studied in relation to endothelial progenitor cells, Notch1 signaling pathway and angiogenesis in rats with isoprenaline (INN)-induced acute myocardial infarcts. To anal...Protective effect of catalpol on myocardium was studied in relation to endothelial progenitor cells, Notch1 signaling pathway and angiogenesis in rats with isoprenaline (INN)-induced acute myocardial infarcts. To analyze the pathological status and impact of catalpol on the rats, 3 weeks after intragastric gavage, the animals were verified for myocardial infarcts with electrocardiogram and measured for enzyme activity of lactate dehydrogenase (LDH), malondialdehyde (MDA), creatine kinase (CK) and superoxide dismutase (SOD) in myocardium, and further analyzed using HE and TTC staining, as well as visual examination of infarct area. Flow cytometry study of endothelial progenitor cells (EPCs) indicated that the EPCs were mobilized during infarction. The roles of Notch1 signaling pathway in angiogenesis of the infracted animals were studied using immunohistochemistry analysis of RBPjκ and Western blot analysis of Notch1 and Jagged1. Our results obtained from the rats treated with catalpol, positive drug and control showed that catalpol could protect rats from infarction probably by mobilization of EPCs and activation of Notch1 signaling pathway.展开更多
【目的】观察苦瓜皂苷G对糖尿病肾病(DN)大鼠的治疗作用及机制。【方法】从55只大鼠中随机抽取45只采用一次性腹腔注射链脲佐菌素(STZ)法诱导DN模型。将造模成功的38只大鼠随机分为模型组9只、苦瓜皂苷G低剂量组9只、苦瓜皂苷G中剂量组1...【目的】观察苦瓜皂苷G对糖尿病肾病(DN)大鼠的治疗作用及机制。【方法】从55只大鼠中随机抽取45只采用一次性腹腔注射链脲佐菌素(STZ)法诱导DN模型。将造模成功的38只大鼠随机分为模型组9只、苦瓜皂苷G低剂量组9只、苦瓜皂苷G中剂量组10只、苦瓜皂苷G高剂量组10只。剩余10只大鼠设为正常组。对应灌胃给药4周后,酶联免疫吸附分析(ELISA)检测大鼠24 h尿蛋白水平,血糖仪检测空腹血糖(FBG),全自动生化分析仪检测血肌酐(SCr)、血尿素氮(BUN)水平,苏木素-伊红染色(HE)法观察大鼠肾组织病理学变化,采用实时定量聚合酶链反应(RT-qPCR)和Western Blot法分别检测E-钙黏蛋白(E-cad)、α-平滑肌肌动蛋白(α-SMA)、Notch1、锌指蛋白转录因子1(Snail1)、Jagged1 m RNA及蛋白表达情况。【结果】与正常组比较,模型组24 h尿蛋白、FBG、血清SCr和BUN水平及肾组织α-SMA、Notch1、Snail1、Jagged1 mRNA及蛋白水平显著升高,肾组织E-cad m RNA及蛋白水平降低,肾组织可见肾小球萎缩、肾小管扩张及间质纤维化;与模型组比较,苦瓜皂苷G低、中、高剂量组24 h尿蛋白、FBG、血清SCr和BUN水平及肾组织α-SMA、Notch1、Snail1、Jagged1 mRNA及蛋白水平显著降低,肾组织E-cad m RNA及蛋白水平升高,肾组织病理损伤得到改善。【结论】苦瓜皂苷G可有效改善DN大鼠肾功能障碍、减轻肾脏纤维化,其机制可能与通过调控Notch/Snail1信号通路,抑制α-SMA和Jagged1 mRNA及蛋白表达,增强E-cad mRNA及蛋白表达有关。展开更多
Objective: To investigate the influence of Notch signaling on osteoprotegerin(OPG)expression in a human oral squamous cell carcinoma cell line.Methods: Activation of Notch signaling was performed by seeding cells on J...Objective: To investigate the influence of Notch signaling on osteoprotegerin(OPG)expression in a human oral squamous cell carcinoma cell line.Methods: Activation of Notch signaling was performed by seeding cells on Jagged1 immobilized surfaces. In other experiments, a g-secretase inhibitor was added to the culture medium to inhibit intracellular Notch signaling. OPG m RNA and protein were determined by real-time PCR and ELISA, respectively. Finally, publicly available microarray database analysis was performed using connection up- or down-regulation expression analysis of microarrays software.Results: Jagged1-treatment of HSC-4 cells enhanced HES1 and HEY1 m RNA expression, confirming the intracellular activation of Notch signaling. OPG m RNA and protein levels were significantly suppressed upon Jagged1 treatment. Correspondingly, HSC-4 cells treated with a g-secretase inhibitor resulted in a significant reduction of HES1 and HEY1 m RNA levels, and a marked increase in OPG protein expression was observed.These results implied that Notch signaling regulated OPG expression in HSC-4 cells.However, Jagged1 did not alter OPG expression in another human oral squamous cell carcinoma cell line(HSC-5) or a human head and neck squamous cell carcinoma cell line(HN22).Conclusions: Notch signaling regulated OPG expression in an HSC-4 cell line and this mechanism could be cell line specific.展开更多
In order to investigate the role of the Notch signaling pathway in skeletal muscle fibrosis after nerve injury, 60 Sprague-Dawley rats were selected and divided randomly into a control and two experimental groups. Gro...In order to investigate the role of the Notch signaling pathway in skeletal muscle fibrosis after nerve injury, 60 Sprague-Dawley rats were selected and divided randomly into a control and two experimental groups. Group A served as controls without any treatment. Rats in groups B were injected intraperitoneally with 0.2 mL PBS and those in group C were injected intraperitoneally with 0.2 mL PBS+100 ymol/L, 0.2 mL N-[N-(3,5-difluorophenacetyl)-l-alanyl]- S-phenylglycine t-butyl ester (DAPT, a gamma-secretase inhibitor that suppresses Notch signaling) respectively, on postoperative days 1, 3, 7, 10, and 14 in a model of denervation-induced skeletal muscle fibrosis by right sciatic nerve transection. Five rats from each group were euthanized on postoperative days 1, 7, 14, and 28 to collect the right gastrocnemii, and hematoxylin and eosin (HE) staining, immunohistochemistry test, real-time PCR, and Western blotting were performed to assess connective tissue hyperplasia and fibroblast density as well as expression of Notch 1, Jagged 1, and Notch downstream molecules Hes 1 and collagen I (COL I) on day 28. There was no significant difference in HE-stained fibroblast density between group B and C on postoperative day 1. However, fibroblast density was significantly higher in group B than in group C on postoperative days 7, 14, and 28. Notch 1, Jagged 1, Hes 1, and COL I proteins in the gastrocnemius were expressed at very low levels in group A but at high levels in group B. Expression levels of these proteins were significantly lower in group C than in group B (P<0.05), but they were higher in group C than in group A (P<0.05) on postoperative day 28. We are led to conclude that locking the Notch signaling pathway inhibits fibrosis progression of denervated skeletal muscle. Thus, it may be a new approach for treatment of fibrosis of denervated skeletal muscle.展开更多
目的:观察有氧游泳运动对Ⅱ型糖尿病大鼠肾脏损伤的改善效果,并探讨其可能的机制。方法:45只4周龄健康雄性SD大鼠,随机抽取10只为正常对照组,基础饲料喂养;其余35只经高糖高脂喂养5周后,配合腹腔注射STZ(35 mg/kg.bw)诱导建立Ⅱ型糖尿...目的:观察有氧游泳运动对Ⅱ型糖尿病大鼠肾脏损伤的改善效果,并探讨其可能的机制。方法:45只4周龄健康雄性SD大鼠,随机抽取10只为正常对照组,基础饲料喂养;其余35只经高糖高脂喂养5周后,配合腹腔注射STZ(35 mg/kg.bw)诱导建立Ⅱ型糖尿病大鼠模型;7周后,将成模大鼠随机分为糖尿病安静组和糖尿病运动组,每组14只。3组大鼠均采用基础饲料喂养;糖尿病运动组大鼠进行8周有氧游泳运动;正常对照组、糖尿病安静组2组大鼠均自由活动,不施加任何干预。结果:(1)8周有氧游泳运动后,糖尿病运动组肾脏在电镜下的形态表现为肾小球三层结构较清晰,基底膜增厚不明显,足突融合减少,溶酶体增多现象等均有一定程度减少,较糖尿病安静组有明显改善;(2)糖尿病运动组血糖浓度和24 h UA排泄量较糖尿病安静组显著降低(分别为P<0.05或P<0.01);(3)糖尿病运动组肾皮质Jagged-1、Val1744NICD和Hes-1蛋白的表达较糖尿病安静组均显著降低(P<0.05或P<0.01)。结论:运动可提高Ⅱ型糖尿病大鼠肾功能,改善大鼠肾脏损伤,可能与其下调Ⅱ型糖尿病状态下激活的Notch-1信号通路有关。展开更多
基金supported by the National Natural Science Foundation of China,Nos.81801660(to XZH)and 81771788(to YMY)。
文摘Inhibition of Notch1 signaling has been shown to promote astrocyte-derived neurogenesis after stroke.To investigate the regulatory role of Notch1 signaling in this process,in this study,we used a rat model of stroke based on middle cerebral artery occlusion and assessed the behavior of reactive astrocytes post-stroke.We used theγ-secretase inhibitor N-[N-(3,5-diuorophenacetyl)-1-alanyl]-S-phenylglycine t-butylester(DAPT)to block Notch1 signaling at 1,4,and 7 days after injury.Our results showed that only administration of DAPT at 4 days after stroke promoted astrocyte-derived neurogenesis,as manifested by recovery of white matter fiber bundle integrity on magnetic resonance imaging,which is consistent with recovery of neurologic function.These findings suggest that inhibition of Notch1 signaling at the subacute stage post-stroke mediates neural repair by promoting astrocyte-derived neurogenesis.
文摘Protective effect of catalpol on myocardium was studied in relation to endothelial progenitor cells, Notch1 signaling pathway and angiogenesis in rats with isoprenaline (INN)-induced acute myocardial infarcts. To analyze the pathological status and impact of catalpol on the rats, 3 weeks after intragastric gavage, the animals were verified for myocardial infarcts with electrocardiogram and measured for enzyme activity of lactate dehydrogenase (LDH), malondialdehyde (MDA), creatine kinase (CK) and superoxide dismutase (SOD) in myocardium, and further analyzed using HE and TTC staining, as well as visual examination of infarct area. Flow cytometry study of endothelial progenitor cells (EPCs) indicated that the EPCs were mobilized during infarction. The roles of Notch1 signaling pathway in angiogenesis of the infracted animals were studied using immunohistochemistry analysis of RBPjκ and Western blot analysis of Notch1 and Jagged1. Our results obtained from the rats treated with catalpol, positive drug and control showed that catalpol could protect rats from infarction probably by mobilization of EPCs and activation of Notch1 signaling pathway.
文摘【目的】观察苦瓜皂苷G对糖尿病肾病(DN)大鼠的治疗作用及机制。【方法】从55只大鼠中随机抽取45只采用一次性腹腔注射链脲佐菌素(STZ)法诱导DN模型。将造模成功的38只大鼠随机分为模型组9只、苦瓜皂苷G低剂量组9只、苦瓜皂苷G中剂量组10只、苦瓜皂苷G高剂量组10只。剩余10只大鼠设为正常组。对应灌胃给药4周后,酶联免疫吸附分析(ELISA)检测大鼠24 h尿蛋白水平,血糖仪检测空腹血糖(FBG),全自动生化分析仪检测血肌酐(SCr)、血尿素氮(BUN)水平,苏木素-伊红染色(HE)法观察大鼠肾组织病理学变化,采用实时定量聚合酶链反应(RT-qPCR)和Western Blot法分别检测E-钙黏蛋白(E-cad)、α-平滑肌肌动蛋白(α-SMA)、Notch1、锌指蛋白转录因子1(Snail1)、Jagged1 m RNA及蛋白表达情况。【结果】与正常组比较,模型组24 h尿蛋白、FBG、血清SCr和BUN水平及肾组织α-SMA、Notch1、Snail1、Jagged1 mRNA及蛋白水平显著升高,肾组织E-cad m RNA及蛋白水平降低,肾组织可见肾小球萎缩、肾小管扩张及间质纤维化;与模型组比较,苦瓜皂苷G低、中、高剂量组24 h尿蛋白、FBG、血清SCr和BUN水平及肾组织α-SMA、Notch1、Snail1、Jagged1 mRNA及蛋白水平显著降低,肾组织E-cad m RNA及蛋白水平升高,肾组织病理损伤得到改善。【结论】苦瓜皂苷G可有效改善DN大鼠肾功能障碍、减轻肾脏纤维化,其机制可能与通过调控Notch/Snail1信号通路,抑制α-SMA和Jagged1 mRNA及蛋白表达,增强E-cad mRNA及蛋白表达有关。
基金Supported by a Faculty Research Grant(No.DRF-59010)Faculty of Dentistry,Chulalongkorn University and the 2012 Research Chair Grant,Thailand National Science and Technology Development Agency
文摘Objective: To investigate the influence of Notch signaling on osteoprotegerin(OPG)expression in a human oral squamous cell carcinoma cell line.Methods: Activation of Notch signaling was performed by seeding cells on Jagged1 immobilized surfaces. In other experiments, a g-secretase inhibitor was added to the culture medium to inhibit intracellular Notch signaling. OPG m RNA and protein were determined by real-time PCR and ELISA, respectively. Finally, publicly available microarray database analysis was performed using connection up- or down-regulation expression analysis of microarrays software.Results: Jagged1-treatment of HSC-4 cells enhanced HES1 and HEY1 m RNA expression, confirming the intracellular activation of Notch signaling. OPG m RNA and protein levels were significantly suppressed upon Jagged1 treatment. Correspondingly, HSC-4 cells treated with a g-secretase inhibitor resulted in a significant reduction of HES1 and HEY1 m RNA levels, and a marked increase in OPG protein expression was observed.These results implied that Notch signaling regulated OPG expression in HSC-4 cells.However, Jagged1 did not alter OPG expression in another human oral squamous cell carcinoma cell line(HSC-5) or a human head and neck squamous cell carcinoma cell line(HN22).Conclusions: Notch signaling regulated OPG expression in an HSC-4 cell line and this mechanism could be cell line specific.
文摘In order to investigate the role of the Notch signaling pathway in skeletal muscle fibrosis after nerve injury, 60 Sprague-Dawley rats were selected and divided randomly into a control and two experimental groups. Group A served as controls without any treatment. Rats in groups B were injected intraperitoneally with 0.2 mL PBS and those in group C were injected intraperitoneally with 0.2 mL PBS+100 ymol/L, 0.2 mL N-[N-(3,5-difluorophenacetyl)-l-alanyl]- S-phenylglycine t-butyl ester (DAPT, a gamma-secretase inhibitor that suppresses Notch signaling) respectively, on postoperative days 1, 3, 7, 10, and 14 in a model of denervation-induced skeletal muscle fibrosis by right sciatic nerve transection. Five rats from each group were euthanized on postoperative days 1, 7, 14, and 28 to collect the right gastrocnemii, and hematoxylin and eosin (HE) staining, immunohistochemistry test, real-time PCR, and Western blotting were performed to assess connective tissue hyperplasia and fibroblast density as well as expression of Notch 1, Jagged 1, and Notch downstream molecules Hes 1 and collagen I (COL I) on day 28. There was no significant difference in HE-stained fibroblast density between group B and C on postoperative day 1. However, fibroblast density was significantly higher in group B than in group C on postoperative days 7, 14, and 28. Notch 1, Jagged 1, Hes 1, and COL I proteins in the gastrocnemius were expressed at very low levels in group A but at high levels in group B. Expression levels of these proteins were significantly lower in group C than in group B (P<0.05), but they were higher in group C than in group A (P<0.05) on postoperative day 28. We are led to conclude that locking the Notch signaling pathway inhibits fibrosis progression of denervated skeletal muscle. Thus, it may be a new approach for treatment of fibrosis of denervated skeletal muscle.
文摘目的:观察有氧游泳运动对Ⅱ型糖尿病大鼠肾脏损伤的改善效果,并探讨其可能的机制。方法:45只4周龄健康雄性SD大鼠,随机抽取10只为正常对照组,基础饲料喂养;其余35只经高糖高脂喂养5周后,配合腹腔注射STZ(35 mg/kg.bw)诱导建立Ⅱ型糖尿病大鼠模型;7周后,将成模大鼠随机分为糖尿病安静组和糖尿病运动组,每组14只。3组大鼠均采用基础饲料喂养;糖尿病运动组大鼠进行8周有氧游泳运动;正常对照组、糖尿病安静组2组大鼠均自由活动,不施加任何干预。结果:(1)8周有氧游泳运动后,糖尿病运动组肾脏在电镜下的形态表现为肾小球三层结构较清晰,基底膜增厚不明显,足突融合减少,溶酶体增多现象等均有一定程度减少,较糖尿病安静组有明显改善;(2)糖尿病运动组血糖浓度和24 h UA排泄量较糖尿病安静组显著降低(分别为P<0.05或P<0.01);(3)糖尿病运动组肾皮质Jagged-1、Val1744NICD和Hes-1蛋白的表达较糖尿病安静组均显著降低(P<0.05或P<0.01)。结论:运动可提高Ⅱ型糖尿病大鼠肾功能,改善大鼠肾脏损伤,可能与其下调Ⅱ型糖尿病状态下激活的Notch-1信号通路有关。
