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首页> 外文期刊>Brain research >Expression of gamma-glutamyl transpeptidase in mouse perivascular astrocytes and in a protoplasmic-like astroglial cell clone.
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Expression of gamma-glutamyl transpeptidase in mouse perivascular astrocytes and in a protoplasmic-like astroglial cell clone.

机译:γ-谷氨酰转肽酶在小鼠血管周星形胶质细胞和原生质样星形胶质细胞克隆中的表达。

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摘要

Gamma-glutamyl transpeptidase (GGT) is known to be present in the central nervous system (CNS) but its cellular localization is still subject to controversy. In this report, we have investigated, with a specific antiserum, the immunolabelling pattern of GGT in the adult mouse CNS at the light and electron microscopic (EM) levels. At the optical level, GGT immunoreactivity ensheathes the majority of vessels in the grey matter. Immunoelectron microscopy shows that labelling is essentially due to the presence of GGT in the astrocytic endfeet which surround vessels. In addition, some pericytes and periendothelial cells are also clearly labelled. We then investigated GGT activity in astroglial cell clones which may represent the in vitro counterpart of the main astroglial cell types. The striking result is that a protoplasmic-like astroglial cell clone shows a noticeable GGT activity, while, in contrast, no activity was detected in the fibrous and the Golgi-Bergmann-like astroglial clones. Taken together, these data indicate that, in the mouse CNS, GGT is essentially present in protoplasmic astrocytes.
机译:已知γ-谷氨酰转肽酶(GGT)存在于中枢神经系统(CNS)中,但其细胞定位仍存在争议。在本报告中,我们使用特定的抗血清研究了成年小鼠中枢神经系统中光和电子显微镜(EM)水平下GGT的免疫标记模式。在光学水平上,GGT免疫反应性会充斥灰质中的大部分血管。免疫电子显微镜显示标记基本上是由于围绕血管的星形细胞末端中存在GGT。另外,一些周细胞和内皮细胞也被清楚地标记。然后,我们调查了星形胶质细胞克隆中的GGT活性,这些克隆可能代表了主要星形胶质细胞类型的体外对应物。惊人的结果是,原生质样星形胶质细胞克隆显示出显着的GGT活性,而相比之下,在纤维状和高尔基-伯格曼样星形胶质细胞克隆中未检测到活性。综上所述,这些数据表明,在小鼠中枢神经系统中,GGT本质上存在于原生质体星形胶质细胞中。

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