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Expression of the high-affinity choline transporter CHT1 in epithelia.

机译:高亲和力胆碱转运蛋白CHT1在上皮细胞中的表达。

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摘要

Uptake of choline by the high-affinity choline transporter CHT1 is the rate-limiting step in neuronal acetylcholine (ACh) synthesis. Here, we investigated by RT-PCR, in-situ hybridisation, immunohistochemistry, and Western blotting whether CHT1 is also expressed in cholinergic epithelia. CHT1-mRNA and -protein were detected in keratinocytes of human skin, rat skin and tongue, the human keratinocyte cell line HaCaT, and the ciliated cells of the rat tracheal epithelium. Immunohistochemically, CHT1 was predominantly localized to the epithelial cell membranes, in case of ciliated tracheal cells it was restricted to the apical membrane. This is the first study to demonstrate the expression of CHT1 in non-neuronal cells. The close apposition of CHT1 to reported sites of localization of choline acetyltransferase in these cells is strongly in favour of ACh synthesis being fuelled by choline uptake via CHT1 in these epithelia.
机译:高亲和力胆碱转运蛋白CHT1对胆碱的摄取是神经元乙酰胆碱(ACh)合成中的限速步骤。在这里,我们通过RT-PCR,原位杂交,免疫组织化学和蛋白质印迹研究了CHT1是否也在胆碱能上皮细胞中表达。在人皮肤,大鼠皮肤和舌头的角质形成细胞,人角质形成细胞系HaCaT和大鼠气管上皮纤毛细胞中检测到CHT1-mRNA和-蛋白。免疫组织化学分析,CHT1主要定位于上皮细胞膜,如果是纤毛气管细胞,则仅限于顶膜。这是第一个证明CHT1在非神经元细胞中表达的研究。 CHT1与这些细胞中胆碱乙酰基转移酶定位位点的紧密结合非常有力地促进了ACh合成,这些胆碱通过CHT1在这些上皮细胞中的摄取促进了ACh合成。

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