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首页> 外文期刊>Journal of Cellular Physiology >MMH cells: An in vitro model for the study of retinol-binding protein secretion regulated by retinol.
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MMH cells: An in vitro model for the study of retinol-binding protein secretion regulated by retinol.

机译:正电胶细胞:一个体外模型研究retinol-binding蛋白质分泌受视黄醇。

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摘要

The untransformed stable cell line Met murine hepatocytes (MMH), generated from liver explants of transgenic mice expressing a constitutively active truncated form of the human hepatocyte growth factor receptor (cyto-Met), represents an innovative tool for in vitro studies of liver function. In the present report, we show that the MMH-D3 line isolated from the liver of a 3-day-old mouse is a useful model to investigate the regulation of the synthesis and secretion of retinol-binding protein (RBP) by retinol (vitamin A alcohol). Experiments with Northern blot hybridization, metabolic labeling of cellular proteins followed by immunoprecipitation, and Western blot analysis demonstrated that, similarly to the in vivo situation, in MMH-D3 cells the presence of retinol does not affect transcriptional and translational rate of the RBP gene but is essential for regulating the secretion rate of the protein. Unlike HepG2 human hepatocarcinoma cells used thus far in studies of retinoid metabolism, including the synthesis and secretion of RBP, vitamin A deficiency causes, in MMH-D3 cells, the inhibiton of RBP secretion and the protein accumulation in the cell, whereas retinol repletion promptly results in RBP secretion. This model will be very useful in future studies on vitamin A distribution in the organism. Copyright 1999 Wiley-Liss, Inc.
机译:untransformed稳定细胞系小鼠肝细胞(嗯),来自肝脏外植体转基因小鼠表达一个既定的活跃的截短形式的人类肝细胞生长因子受体(cyto-Met),代表了创新工具的体外研究肝脏函数。MMH-D3行孤立的肝脏抱鼠标是一个有用的模型进行调查的合成和分泌的调节视黄醇(维生素retinol-binding蛋白(RBP)酒精)。杂交、代谢标记的细胞其次是免疫沉淀反应,和的蛋白质免疫印迹分析证明,在MMH-D3类似于体内的情况细胞视黄醇的存在并不影响转录和转译RBP的速度基因但调控至关重要分泌的蛋白质。目前用于研究肝癌细胞类维生素a代谢,包括合成和分泌的RBP,维生素A缺乏症引起MMH-D3细胞,inhibiton RBP分泌和蛋白质在细胞中积累,而视黄醇饱满迅速导致RBP分泌。未来研究维生素A分布有机体。

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