Aim: This study aimed to investigate the protective effects of flavonoids from the stem and leaves of Scutellaria baicalensis Georgi (SSFs) against Aβ<sub>1-42</sub>-induced oligodendrocytes (OL) damage. ...Aim: This study aimed to investigate the protective effects of flavonoids from the stem and leaves of Scutellaria baicalensis Georgi (SSFs) against Aβ<sub>1-42</sub>-induced oligodendrocytes (OL) damage. Methods: Immunofluorescence was used for the detection of myelin-associated glycoprotein (MAG), a characteristic protein of rat oligodendrocytes (OLN-93 cells). To evaluate the potential protective effects of SSFs on OLN-93 cells injured by Aβ<sub>1-42</sub>, an injury model was established by subjecting OLN-93 cells to Aβ<sub>1-42</sub> exposed. Cell morphology was examined using an inverted microscope, while cell viability was assessed using the colorimetric method of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). Additionally, lactate dehydrogenase (LDH) was measured using the pyruvic acid reduction assay. The Ginkgo biloba leaf extract (GBE) injection was used as a positive control. Results: A total of >95% of the MAG immunofluorescence-positive cells were identified as oligodendrocytes. Gradually increasing concentrations of SSFs impaired the cells, and the maximum nondetrimental dose for OLN-93 cells was 75 mg/L. This study assessed the effects of SSFs on OLN-93 cells damaged by Aβ<sub>1-42</sub>. The results indicated that SSFs significantly improved OLN-93 cell morphological abnormal changes, increased the OLN-93 cell survival rate, and reduced LDH release. Conclusion: SSFs can alleviate Aβ<sub>1-42</sub>-induced damage of OL.展开更多
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
文摘Aim: This study aimed to investigate the protective effects of flavonoids from the stem and leaves of Scutellaria baicalensis Georgi (SSFs) against Aβ<sub>1-42</sub>-induced oligodendrocytes (OL) damage. Methods: Immunofluorescence was used for the detection of myelin-associated glycoprotein (MAG), a characteristic protein of rat oligodendrocytes (OLN-93 cells). To evaluate the potential protective effects of SSFs on OLN-93 cells injured by Aβ<sub>1-42</sub>, an injury model was established by subjecting OLN-93 cells to Aβ<sub>1-42</sub> exposed. Cell morphology was examined using an inverted microscope, while cell viability was assessed using the colorimetric method of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT). Additionally, lactate dehydrogenase (LDH) was measured using the pyruvic acid reduction assay. The Ginkgo biloba leaf extract (GBE) injection was used as a positive control. Results: A total of >95% of the MAG immunofluorescence-positive cells were identified as oligodendrocytes. Gradually increasing concentrations of SSFs impaired the cells, and the maximum nondetrimental dose for OLN-93 cells was 75 mg/L. This study assessed the effects of SSFs on OLN-93 cells damaged by Aβ<sub>1-42</sub>. The results indicated that SSFs significantly improved OLN-93 cell morphological abnormal changes, increased the OLN-93 cell survival rate, and reduced LDH release. Conclusion: SSFs can alleviate Aβ<sub>1-42</sub>-induced damage of OL.
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。
