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Expression and function of the non-neuronal cholinergic system in endothelial cells.

机译:非神经胆碱能系统在内皮细胞中的表达和功能。

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摘要

Increasing evidence has shown the expression of the non-neuronal cholinergic system in endothelial cells. In the present experiments the expression of choline acetyltransferase (ChAT) was investigated in human endothelial cells by anti-ChAT immunohistochemistry and anti-ChAT immunofluorescence. Positive ChAT immunoreactivity was found in cultures of human umbilical endothelial cells (HUVEC) and a human angiosarcoma cell line (HAEND). In HUVEC and HAEND choline acetyltransferase activity and small amounts of acetylcholine were also detected. Positive ChAT-immunoreactivity was demonstrated in situ in endothelial cells of the human umbilical cord. In addition, in experiments with confocal laser scanning microscopy positive anti-ChAT immunoreactivity was found in situ in endothelial cells of human skin blood vessels. In the first functional experiments with HUVEC acetylcholine appeared to mediate a small facilitatory effect on the expression of intracellular adhesion molecule-1. The present experiments demonstrate the wide existence of ChAT in human endothelial cells. Further experiments are addressed to elucidate the biological role of acetylcholine in the endothelium and possible differences between the different subtypes of endothelial cells.
机译:越来越多的证据表明非神经胆碱能系统在内皮细胞中的表达。在本实验中,通过抗ChAT免疫组织化学和抗ChAT免疫荧光技术研究了胆碱乙酰转移酶(ChAT)在人内皮细胞中的表达。在人脐带内皮细胞(HUVEC)和人血管肉瘤细胞系(HAEND)的培养物中发现ChAT阳性。在HUVEC和HAEND中,还检测到胆碱乙酰转移酶活性和少量乙酰胆碱。在人脐带内皮细胞中原位证明了ChAT免疫阳性。另外,在用共聚焦激光扫描显微镜进行的实验中,在人皮肤血管的内皮细胞中原位发现了阳性的抗ChAT免疫反应性。在第一个使用HUVEC的功能性实验中,乙酰胆碱似乎对细胞内粘附分子1的表达介导了小的促进作用。本实验证明了ChAT在人类内皮细胞中的广泛存在。进行进一步的实验以阐明乙酰胆碱在内皮中的生物学作用以及内皮细胞不同亚型之间的可能差异。

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