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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >A calcium responsive element that regulates expression of two calcium binding proteins in Purkinje cells
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A calcium responsive element that regulates expression of two calcium binding proteins in Purkinje cells

机译:钙反应元件,调节浦肯野细胞中两种钙结合蛋白的表达

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摘要

Calbindin D28 encodes a calcium binding protein that is expressed in the cerebellum exclusively in Purkinje cells. We have used biolistic transfection of organo- typic slices of P12 cerebellum to identify a 40-bp element from the calbindin promoter that is necessary and sufficient for Purkinje cell specific expression in this transient in situ assay. This element (PCE1) is also present in the calmodulin II promoter, which regulates expression of a second Purkinje cell Ca~2+ binding protein. Expression of high levels of exog- enous calbindin or calretinin decreased transcription medi- ated by PCE1 in Purkinje cells 2.5- to 3-fold, whereas the presence of 1 μM ionomycin in the extracellular medium increased expression.
机译:钙结合蛋白D28编码钙结合蛋白,其仅在浦肯野细胞中在小脑中表达。我们已经使用P12小脑的有机型切片的生物弹射转染从calbindin启动子中鉴定出40 bp的元件,该元件对于在此瞬时原位测定中Purkinje细胞特异性表达是必要和充分的。该元件(PCE1)也存在于钙调蛋白II启动子中,该启动子调节第二浦肯野细胞Ca〜2 +结合蛋白的表达。大量外源钙结合蛋白或钙调蛋白的表达使浦肯野细胞中PCE1介导的转录降低了2.5到3倍,而细胞外培养基中存在1μM的离子霉素则增加了表达。

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