Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the brain.However,it is not yet clear how the pr...Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the brain.However,it is not yet clear how the primary visual cortex(V1)is altered in glaucoma.This study used DBA/2J mice as a model for spontaneous secondary glaucoma.The aim of the study was to compare the electrophysiological and histomorphological chara cteristics of neurons in the V1between 9-month-old DBA/2J mice and age-matched C57BL/6J mice.We conducted single-unit recordings in the V1 of light-anesthetized mice to measure the visually induced responses,including single-unit spiking and gamma band oscillations.The morphology of layerⅡ/Ⅲneurons was determined by neuronal nuclear antigen staining and Nissl staining of brain tissue sections.Eighty-seven neurons from eight DBA/2J mice and eighty-one neurons from eight C57BL/6J mice were examined.Compared with the C57BL/6J group,V1 neurons in the DBA/2J group exhibited weaker visual tuning and impaired spatial summation.Moreove r,fewer neuro ns were observed in the V1 of DBA/2J mice compared with C57BL/6J mice.These findings suggest that DBA/2J mice have fewer neurons in the VI compared with C57BL/6J mice,and that these neurons have impaired visual tuning.Our findings provide a better understanding of the pathological changes that occur in V1 neuron function and morphology in the DBA/2J mouse model.This study might offer some innovative perspectives regarding the treatment of glaucoma.展开更多
目的观察补肾强督方对自发性强直性脊柱炎模型DBA/1小鼠关节韧带及附着点骨化程度和DKK1/Wnt通路的影响,探讨补肾强督方防治强直性脊柱炎的作用机制。方法将30只12周龄的雄性DBA/1小鼠随机分为模型组、阳性药物组、补肾强督方低、中、...目的观察补肾强督方对自发性强直性脊柱炎模型DBA/1小鼠关节韧带及附着点骨化程度和DKK1/Wnt通路的影响,探讨补肾强督方防治强直性脊柱炎的作用机制。方法将30只12周龄的雄性DBA/1小鼠随机分为模型组、阳性药物组、补肾强督方低、中、高剂量组,每组6只,另设6只同周龄C57BL/6小鼠作为空白组。补肾强督方低、中及高剂量组分别灌胃低、中、高浓度的补肾强督方,所含生药重量分别为11.25、22.5、45 g/(kg·d),0.2 m L/只,每日1次;阳性药物组灌胃塞来昔布胶囊0.8 mg/只,0.2 m L/只,每日1次;模型组及空白组灌胃等量的生理盐水。连续饲养、灌胃12周。定期观察小鼠体重、饮食、大便、毛发等情况。每两周评价1次小鼠关节炎体征。处死后取小鼠跟腱部位进行大体观察,对跟腱组织行HE染色,用免疫组化法检测小鼠跟腱中碱性磷酸酶(alkaline phosphatase,ALP)、骨钙素(bone gamma-carboxyglutamicacid-containing proteins,BGP)、DKK1、Wnt5a的蛋白表达。结果与空白对照组比较,模型组关节炎体征评分明显升高,而补肾强督方各剂量组及阳性药物组评分均低于模型组(P<0.05)。跟腱组织病理观察显示,正常组无炎性细胞及成纤维细胞浸润,组织形态结构正常;模型组出现不同程度的软骨及骨形成、炎性细胞及附着点成纤维样细胞浸润;各给药组小鼠跟腱组织多见散在淋巴细胞浸润,软骨及骨形成较少见。与空白组比较,模型组组织标本骨化评分升高,补肾强督方各剂量组及阳性药物组评分均低于模型组,差异有统计学意义(P<0.05)。与空白组比较,模型组DKK1蛋白表达降低,Wnt5a蛋白表达升高(P<0.05);与模型组比较,补肾强督方高、中剂量组DKK1蛋白表达升高,Wnt5a蛋白降低,差异有统计学意义(P<0.05)。结论补肾强督方可能通过抑制经典Wnt通路来延缓自发性强直性脊柱炎模型DBA/1小鼠关节炎及骨化程度的发生与发展。展开更多
基金supported by the STI 2030-Major Projects 2022ZD0208500(to DY)the National Natural Science Foundation of China,Nos.82072011(to YX),82121003(to DY),82271120(to YS)+2 种基金Sichuan Science and Technology Program,No.2022ZYD0066(to YS)a grant from Chinese Academy of Medical Science,No.2019-12M-5-032(to YS)the Fundamental Research Funds for the Central Universities,No.ZYGX2021YGLH219(to KC)。
文摘Glaucoma is a leading cause of irreve rsible blindness wo rldwide,and previous studies have shown that,in addition to affecting the eyes,it also causes abnormalities in the brain.However,it is not yet clear how the primary visual cortex(V1)is altered in glaucoma.This study used DBA/2J mice as a model for spontaneous secondary glaucoma.The aim of the study was to compare the electrophysiological and histomorphological chara cteristics of neurons in the V1between 9-month-old DBA/2J mice and age-matched C57BL/6J mice.We conducted single-unit recordings in the V1 of light-anesthetized mice to measure the visually induced responses,including single-unit spiking and gamma band oscillations.The morphology of layerⅡ/Ⅲneurons was determined by neuronal nuclear antigen staining and Nissl staining of brain tissue sections.Eighty-seven neurons from eight DBA/2J mice and eighty-one neurons from eight C57BL/6J mice were examined.Compared with the C57BL/6J group,V1 neurons in the DBA/2J group exhibited weaker visual tuning and impaired spatial summation.Moreove r,fewer neuro ns were observed in the V1 of DBA/2J mice compared with C57BL/6J mice.These findings suggest that DBA/2J mice have fewer neurons in the VI compared with C57BL/6J mice,and that these neurons have impaired visual tuning.Our findings provide a better understanding of the pathological changes that occur in V1 neuron function and morphology in the DBA/2J mouse model.This study might offer some innovative perspectives regarding the treatment of glaucoma.
文摘目的观察补肾强督方对自发性强直性脊柱炎模型DBA/1小鼠关节韧带及附着点骨化程度和DKK1/Wnt通路的影响,探讨补肾强督方防治强直性脊柱炎的作用机制。方法将30只12周龄的雄性DBA/1小鼠随机分为模型组、阳性药物组、补肾强督方低、中、高剂量组,每组6只,另设6只同周龄C57BL/6小鼠作为空白组。补肾强督方低、中及高剂量组分别灌胃低、中、高浓度的补肾强督方,所含生药重量分别为11.25、22.5、45 g/(kg·d),0.2 m L/只,每日1次;阳性药物组灌胃塞来昔布胶囊0.8 mg/只,0.2 m L/只,每日1次;模型组及空白组灌胃等量的生理盐水。连续饲养、灌胃12周。定期观察小鼠体重、饮食、大便、毛发等情况。每两周评价1次小鼠关节炎体征。处死后取小鼠跟腱部位进行大体观察,对跟腱组织行HE染色,用免疫组化法检测小鼠跟腱中碱性磷酸酶(alkaline phosphatase,ALP)、骨钙素(bone gamma-carboxyglutamicacid-containing proteins,BGP)、DKK1、Wnt5a的蛋白表达。结果与空白对照组比较,模型组关节炎体征评分明显升高,而补肾强督方各剂量组及阳性药物组评分均低于模型组(P<0.05)。跟腱组织病理观察显示,正常组无炎性细胞及成纤维细胞浸润,组织形态结构正常;模型组出现不同程度的软骨及骨形成、炎性细胞及附着点成纤维样细胞浸润;各给药组小鼠跟腱组织多见散在淋巴细胞浸润,软骨及骨形成较少见。与空白组比较,模型组组织标本骨化评分升高,补肾强督方各剂量组及阳性药物组评分均低于模型组,差异有统计学意义(P<0.05)。与空白组比较,模型组DKK1蛋白表达降低,Wnt5a蛋白表达升高(P<0.05);与模型组比较,补肾强督方高、中剂量组DKK1蛋白表达升高,Wnt5a蛋白降低,差异有统计学意义(P<0.05)。结论补肾强督方可能通过抑制经典Wnt通路来延缓自发性强直性脊柱炎模型DBA/1小鼠关节炎及骨化程度的发生与发展。
