L-型钙通道α1亚单位在成年鼠海马神经元上的差异性表达

目的观察L-型钙通道不同的α1亚单位在成年鼠海马不同亚区神经元中表达的变化.方法运用免疫组织化学染色方法特异性地标记脑型L-型L-型钙通道不同的α1亚单位CaV1.2α1C和CaV1.3α1D.结果CaV1.2α1C主要分布在CA1区锥体细胞突起部分及CA3区锥体细胞的胞体区、基树突和远端顶树突;CaV1.3α1D则主要集中分布在海马各亚区的胞体区和近端突起;此外,CaV1.2α1C和CaV1.3α1D在细胞局部的分布特性上亦明显不同,前者主要呈现簇状分布,而后者则呈均匀分布.结论L-型钙通道CaV1.2α1C和CaV1.3α1D亚单位在成年鼠海马不同亚区神经元中呈现差异性表达.

Differential expression of L-type calcium channel alpha1 subunits on adult rat hippocampal neurons]

OBJECTIVE: To study the localization of L-type calcium channel alpha1 subunits CaV1.2alpha1C and CaV1.3alpha1D in CA1 and CA3 regions of adult rat hippocampus. METHODS: Immunohistochemical staining was employed for specific labeling of alpha1 subunits CaV1.2alpha1C and CaV1.3alpha1D. RESULTS: CaV1.2alpha1C subunit was mainly located in the apical and basal dendrites in the CA1 area and the CA3 area, neuronal soma, basal dendrites and distal apical dendrites were all positively stained. In contrast to CaV1.2alpha1C, CaV1.3alpha1D displayed no obvious difference in immunostaining between CA1 and CA3, and was distributed mainly in the neuronal soma and proximal dendrites. At cellular level, CaV1.2alpha1C distribution showed a distinct clustered pattern while a uniform distribution was observed for CaV1.3alpha1D subunit. CONCLUSION: Different alpha1 subunits of L-type calcium channel have differential expression in adult hippocampal neurons.