神经粘附分子NB-3在中枢神经系统中的表达

来源 :中国神经科学学会第四次会员代表大会暨第七届全国学术会议(The 7th Biennial Meeting and the | 被引量 : 0次 | 上传用户:gulongliu
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  目的 NB-3是1996年发现的神经黏附分子,属于免疫球蛋白超家族中Contactin/F3亚家族中的成员,在神经轴突导向和神经发育中具有重要作用.本实验检测了NB-3在小鼠大脑组织中不同时期的表达情况.方法 (1)主要采用现有的NB-3基因敲除的小鼠即胚胎18天(E18)的NB-3(+/-)胎鼠和8-10周的NB-3(+/-)成鼠的大脑组织,采用X-gal染色的方法检测LacZ基因产物β-半乳糖苷酶的表达.(2)分离E18天的C57胎鼠大脑皮层组织,进行神经元的体外培养,并进行免疫细胞化学染色检测NB-3在神经元中的表达.结果 NB-3小鼠用Lac Z基因取代NB-3基因的第二个外显子,从而产生了NB-3基因功能缺失的小鼠.因此,Lac Z基因的表达间接反映了NB-3基因的表达.E18天NB-3(+/-)胎鼠的大脑片中,NB-3在大脑皮层、侧脑室和第三脑室的周围即有表达,其中在皮层中的表达主要集中在Ⅱ、Ⅲ、V层,而在侧脑室边缘的信号最强.(2)在NB-3(+/-)成鼠的大脑组织中,NB-3广泛表达在大脑皮层、大脑新皮质下层、梨状皮质、海马区、基底外侧杏仁核.在丘脑前核、副外侧核、丘脑的中外侧膝状体核、下丘脑的室旁和腹内侧核也有较强的NB-3阳性信号.(3)体外培养的神经元进行免疫细胞化学染色,NB-3与MAP2共定位.结论 (1)NB-3在发育和成体小鼠中枢神经系统中均有表达.(2)NB-3在体外培养的神经元中表达.这些结果提示:NB-3在神经系统的发育过程中可能具有重要的作用.
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