目的旨在建立血管性抑郁症(vascular depression,VD)的理想动物模型。方法选用SD大鼠40只,采用数字表法随机分为4组:1手术组:双侧颈总动脉结扎(ligation of bilateral common carotid arteries,LBCCA);2假手术组:同手术组处理,但不结扎;...目的旨在建立血管性抑郁症(vascular depression,VD)的理想动物模型。方法选用SD大鼠40只,采用数字表法随机分为4组:1手术组:双侧颈总动脉结扎(ligation of bilateral common carotid arteries,LBCCA);2假手术组:同手术组处理,但不结扎;3抑郁组:慢性不可预见性温和应激(chronic unpredictable mild stress,CUMS)结合孤养,不进行手术;4模型组:LBCCA叠加CUMS,结合孤养。连续观察21 d,观测大鼠体质量变化、行为学改变、脑血流量变化以及大鼠大脑基质金属蛋白酶(matrix metalloproteinases,MMPs)、脑源性神经营养因子(brain-derived neurotrophic factor,BDNF)、酪氨酸激酶受体B(tropomyosin related kinase B,Trk B)蛋白及其mRNA表达水平的变化。结果与假手术组比较,模型组和抑郁组大鼠体质量、糖水消耗百分率、旷场试验运动距离及站立次数均明显降低(P<0.05或P<0.01),手术组及模型组大鼠脑血流量明显降低(P<0.01),手术组及模型组MMP-2及MMP-2 mRNA表达水平显著增高(P<0.01),抑郁组及模型组海马内BDNF/Trk B及BDNF/Trk B mRNA表达均明显降低(P<0.01或P<0.05)。结论 LBCCA叠加CUMS结合孤养方法较好地模拟了抑郁核心症状快感缺乏、运动和探索能下降的行为特征和神经血管单元(neurovascular unit,NVU)稳态失衡的病理机制,是较为理想的血管性抑郁模型,可用于药理实验及治疗效果机制研究。展开更多
Aging affects the nervous system as well as other organs.In our study,we aimed to study the pharmacological effects and mechanism of porcine placental peptides(PPP)in aging process,and to observe the changes of neurob...Aging affects the nervous system as well as other organs.In our study,we aimed to study the pharmacological effects and mechanism of porcine placental peptides(PPP)in aging process,and to observe the changes of neuroblast proliferation and differentiation as well as partial gene expression in hippocampus of D-galactose-induced aged mouse.Based on the analysis of experimental results,it was confirmed that PPP significantly improved neurobalst proliferation and differentiation in the mouse hippocampal DG by ki-67 and DCX immunohistochemistry.This result showed that PPP had anti-aging effects on D-galactoseinduced aging mouse model.Moreover,we observed up-regulated expressions of BDNF and TrkB proteins and down-regulated expressions of Caspase 3,8,and 9 proteins in the PPP-treated mouse hippocampus.Therefore,our results showed that PPP obviously improved neuroblast proliferation and differentiation,and its anti-aging effect might berelated to down-regulation of apoptosis-related proteins,including Caspase 3,8,and 9,via BDNF/TrkB pathway.Our findings provided valuable evidence for its applications in the health and medicine sectors.展开更多
基金The University Natural Science Research major Project of Jiangsu Province(Grant No.16KJA310006)
文摘Aging affects the nervous system as well as other organs.In our study,we aimed to study the pharmacological effects and mechanism of porcine placental peptides(PPP)in aging process,and to observe the changes of neuroblast proliferation and differentiation as well as partial gene expression in hippocampus of D-galactose-induced aged mouse.Based on the analysis of experimental results,it was confirmed that PPP significantly improved neurobalst proliferation and differentiation in the mouse hippocampal DG by ki-67 and DCX immunohistochemistry.This result showed that PPP had anti-aging effects on D-galactoseinduced aging mouse model.Moreover,we observed up-regulated expressions of BDNF and TrkB proteins and down-regulated expressions of Caspase 3,8,and 9 proteins in the PPP-treated mouse hippocampus.Therefore,our results showed that PPP obviously improved neuroblast proliferation and differentiation,and its anti-aging effect might berelated to down-regulation of apoptosis-related proteins,including Caspase 3,8,and 9,via BDNF/TrkB pathway.Our findings provided valuable evidence for its applications in the health and medicine sectors.
