本实验应用原位杂交组织化学技术,利用同位素标记的寡核苷酸探针,对大鼠前脑含Calbindin-D28 K mRNA的神经元的分布状况进行了详细的观察。结果发现在不同脑区或核团中,标记神经元的数量和标记强度各不相同。某些部位含许多强阳性神经元...本实验应用原位杂交组织化学技术,利用同位素标记的寡核苷酸探针,对大鼠前脑含Calbindin-D28 K mRNA的神经元的分布状况进行了详细的观察。结果发现在不同脑区或核团中,标记神经元的数量和标记强度各不相同。某些部位含许多强阳性神经元,如:前嗅核、大脑皮质、尾壳核、缰核、下丘脑、齿状回及中脑和杏仁复合体中的部分核团;然而,在另外一些脑区中,标记细胞呈中等阳性,如:嗅球的球旁细胞、盖带、梨状区内核、海马的CA1区中的锥体细胞层以及丘脑和杏仁核复合体中的部分核团。少数脑区中的标记细胞呈弱阳性,且数量较少,如;嗅结节、隔区、斜角带核等。这些结果表明含Calbindin-D28K mRNA的神经元在大鼠前脑中具有区域特异性分布特点,从而提示Calbindin-D28K在神经系统中的某些部位可能具有重要的作用。展开更多
目的探讨在1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)致小鼠黑质多巴胺(DA)能细胞发生凋亡时,calb ind in-D-28k(CB)抗细胞凋亡的作用机制。方法MPTP连续5天腹腔注射构建中脑黑质DA能细胞损伤的小鼠模型,模型鼠脑黑质致密部立体定位注射携...目的探讨在1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)致小鼠黑质多巴胺(DA)能细胞发生凋亡时,calb ind in-D-28k(CB)抗细胞凋亡的作用机制。方法MPTP连续5天腹腔注射构建中脑黑质DA能细胞损伤的小鼠模型,模型鼠脑黑质致密部立体定位注射携带CB基因的高滴度慢病毒颗粒(CB-H IV-Ⅰ),W estern b lotting方法检测CB的在体过表达以及鼠脑黑质部位凋亡相关蛋白Bax的表达变化。结果与空白对照组(control)和黑质定位注射空病毒颗粒组(H IV-Ⅰ)相比,注射CB-H IV-Ⅰ的实验组的黑质中CB的表达量显著升高(P<0.05),而Bax的表达量明显降低(P<0.05)。结论病毒颗粒CB-H IV-Ⅰ携带的CB基因在黑质细胞中获得了高效的表达;凋亡相关蛋白Bax可能参与了CB对黑质DA能神经细胞的保护作用。展开更多
Calbindin D-28K （CB）, a Ca2＋-binding protein, maintains Ca2＋ homeostasis and protects neurons against various insults. Hyperthermia can exacerbate brain damage produced by ischemic insults. However, little is repo...Calbindin D-28K （CB）, a Ca2＋-binding protein, maintains Ca2＋ homeostasis and protects neurons against various insults. Hyperthermia can exacerbate brain damage produced by ischemic insults. However, little is reported about the role of CB in the brain under hyperthermic condition during ischemic insults. We inves- tigated the effects of transient global cerebral ischemia on CB immunoreactivity as well as neuronal damage in the hippocampal formation under hyperthermic condition using immunohistochemistry for neuronal nuclei （NeuN） and CB, and Fluoro-Jade B histofluorescence staining in gerbils. Hyperthermia （39.5 ＋ 0.2~C） was induced for 30 minutes before and during transient ischemia. Hyperthermic ischemia resulted in neu- ronal damage/death in the pyramidal layer of CA1-3 area and in the polymorphic layer of the dentate gyrus at 1, 2, 5 days after ischemia. In addition, hyperthermic ischemia significantly decreaced CB immunoreac- tivity in damaged or dying neurons at 1, 2, 5 days after ischemia. In brief, hyperthermic condition produced more extensive and severer neuronal damage/death, and reduced CB immunoreactivity in the hippocampus following transient global cerebral ischemia. Present findings indicate that the degree of reduced CB immu- noreactivity might be related with various neuronal damage/death overtime and corresponding areas after ischemic insults.展开更多
文摘本实验应用原位杂交组织化学技术,利用同位素标记的寡核苷酸探针,对大鼠前脑含Calbindin-D28 K mRNA的神经元的分布状况进行了详细的观察。结果发现在不同脑区或核团中,标记神经元的数量和标记强度各不相同。某些部位含许多强阳性神经元,如:前嗅核、大脑皮质、尾壳核、缰核、下丘脑、齿状回及中脑和杏仁复合体中的部分核团;然而,在另外一些脑区中,标记细胞呈中等阳性,如:嗅球的球旁细胞、盖带、梨状区内核、海马的CA1区中的锥体细胞层以及丘脑和杏仁核复合体中的部分核团。少数脑区中的标记细胞呈弱阳性,且数量较少,如;嗅结节、隔区、斜角带核等。这些结果表明含Calbindin-D28K mRNA的神经元在大鼠前脑中具有区域特异性分布特点,从而提示Calbindin-D28K在神经系统中的某些部位可能具有重要的作用。
文摘目的探讨在1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)致小鼠黑质多巴胺(DA)能细胞发生凋亡时,calb ind in-D-28k(CB)抗细胞凋亡的作用机制。方法MPTP连续5天腹腔注射构建中脑黑质DA能细胞损伤的小鼠模型,模型鼠脑黑质致密部立体定位注射携带CB基因的高滴度慢病毒颗粒(CB-H IV-Ⅰ),W estern b lotting方法检测CB的在体过表达以及鼠脑黑质部位凋亡相关蛋白Bax的表达变化。结果与空白对照组(control)和黑质定位注射空病毒颗粒组(H IV-Ⅰ)相比,注射CB-H IV-Ⅰ的实验组的黑质中CB的表达量显著升高(P<0.05),而Bax的表达量明显降低(P<0.05)。结论病毒颗粒CB-H IV-Ⅰ携带的CB基因在黑质细胞中获得了高效的表达;凋亡相关蛋白Bax可能参与了CB对黑质DA能神经细胞的保护作用。
基金supported by the Biomedical Technology Development Program of the NRF funded by the Korean Government,MSIP(NRF-2015M3A9B6066835)by the Bio-Synergy Research Project(NRF-2015M3A9C4076322)of the Ministry of Science,ICT and Future Planning through the National Research Foundation
文摘Calbindin D-28K （CB）, a Ca2＋-binding protein, maintains Ca2＋ homeostasis and protects neurons against various insults. Hyperthermia can exacerbate brain damage produced by ischemic insults. However, little is reported about the role of CB in the brain under hyperthermic condition during ischemic insults. We inves- tigated the effects of transient global cerebral ischemia on CB immunoreactivity as well as neuronal damage in the hippocampal formation under hyperthermic condition using immunohistochemistry for neuronal nuclei （NeuN） and CB, and Fluoro-Jade B histofluorescence staining in gerbils. Hyperthermia （39.5 ＋ 0.2~C） was induced for 30 minutes before and during transient ischemia. Hyperthermic ischemia resulted in neu- ronal damage/death in the pyramidal layer of CA1-3 area and in the polymorphic layer of the dentate gyrus at 1, 2, 5 days after ischemia. In addition, hyperthermic ischemia significantly decreaced CB immunoreac- tivity in damaged or dying neurons at 1, 2, 5 days after ischemia. In brief, hyperthermic condition produced more extensive and severer neuronal damage/death, and reduced CB immunoreactivity in the hippocampus following transient global cerebral ischemia. Present findings indicate that the degree of reduced CB immu- noreactivity might be related with various neuronal damage/death overtime and corresponding areas after ischemic insults.
