The presence of transthyretin in rat ependymal cells is due to endocytosis and not synthesis

The presence of transthyretin in rat ependymal cells is due to endocytosis and not synthesis
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大鼠室管膜细胞中转甲状腺素蛋白的存在是由于内吞作用而非合成

DOI:
10.1016/s0006-8993(98)00154-1
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发表时间:
1998
期刊:
影响因子:
2.9
通讯作者:
J. Delaunoy
J. Delaunoy
中科院分区:
医学3区
文献类型:
--
作者:
S. Kuchler;M. Ittel;J. Dietrich;A. Reeber;M. Zaepfel;J. Delaunoy

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用免疫细胞化学、原位杂交、Northern和Western印迹等方法研究了大鼠脑脊液中甲状腺激素的主要载体蛋白--甲状腺激素在脉络丛上皮细胞和室管膜细胞中的存在和合成。在发育中的大鼠大脑半球和培养的细胞中,脉络丛上皮细胞高水平表达转甲状腺素。这些细胞将反式甲状腺激素分泌到脑脊液中。在发育中的大鼠脑内,转甲状腺素存在于室管膜细胞的细胞质、与顶膜接触的小泡和纤毛中。在室管膜细胞培养中,这种蛋白质在这些细胞的纤毛中特别丰富。相反,室管膜细胞不合成转甲状腺素。据推测,转甲状腺素通过内吞作用从脑脊液转运到室管膜细胞。
The presence and synthesis of transthyretin, a major carrier protein of thyroxine in rat cerebrospinal fluid, was investigated in choroid plexus epithelial cells and ependymal cells by immunocytochemistry, in situ hybridization, and analysis by Northern and Western blot using a specific oligonucleotide probe and a specific polyclonal antibody to transthyretin. Choroid plexus epithelial cells expressed transthyretin at high levels in developing rat cerebral hemispheres and in cultured cells. These cells secreted transthyretin into the cerebrospinal fluid. In the developing rat brain transthyretin was present in the cytoplasm of ependymal cells, in vesicles in contact with the apical membrane and in cilia. In ependymal cell cultures this protein was particularly abundant in the cilia of these cells. In contrast, ependymal cells did not synthesize transthyretin. It is postulated that transthyretin is transported to ependymal cells from the cerebrospinal fluid by endocytosis.
一种快速、简单的一步法,用于从单层细胞中分离 Poly(A) RNA。
DOI: 10.1210/endo-127-4-2038
发表时间: 1990
期刊: Endocrinology
影响因子: 4.8
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DOI: --
发表时间: 1990
期刊: The Journal of biological chemistry
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免疫反应性转甲状腺素蛋白(前白蛋白)和转甲状腺素蛋白 mRNA 在胎儿和成年大鼠脑中的定位。
DOI: 10.1111/j.1432-0436.1986.tb00402.x
发表时间: 1986
期刊: Differentiation; research in biological diversity
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DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
Tsutsumi,M;Skinner,MK;Sanders-Bush,E
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DOI: 10.1073/pnas.80.13.4045
发表时间: 1983-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
作者:
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通讯作者: WARD, DC