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TGF-β receptors in mouse ES-5 cells and their differentiated derivatives

机译:小鼠ES-5细胞中的TGF-β受体及其分化衍生物

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摘要

By radioreceptor binding studies with iodinated TGF-β1, it has been shown that an undifferentiated ES-5 cell expresses approximately 3270 receptors with a dissociation constant Kd=130pM, but after the induction of differentiation by retinoic acid and dBcAMP, the receptor number of a differentiated RA-ES-5 cell was increased about 80% and the Kd was also increased to 370 pM. Furthermore, more direct evidence supporting the expression of TGF-β type Ⅰ and type Ⅱ receptors in both ES-5 and RA-ES-5 cells has come from dot blot hybridization of cellular mRNA with cDNA probes for type Ⅰ and type Ⅱ recep-tors. Meanwhile, mRNA expression level of types Ⅰ and Ⅱ receptors in RA-ES-5 cells were higher than that in ES-5 cells. Down- regulation of TGF-β receptors with a significant decrease in the rate of cell proliferation in both cells, was found by employing a pretreatment with neutralizing antibody to TGF-β1. The possible role of receptors for TGF-β in cell differentiation is discussed here.
机译:通过用碘化的TGF-β1进行的放射性受体结合研究,已证明未分化的ES-5细胞表达约3270个受体,解离常数Kd = 130pM,但在视黄酸和dBcAMP诱导分化后,a的受体数分化的RA-ES-5细胞增加了约80%,Kd也增加到了370 pM。此外,更直接的证据支持ES-5和RA-ES-5细胞中TGF-βⅠ型和Ⅱ型受体的表达,是通过细胞cDNA与Ⅰ型和Ⅱ型recep-cDNA探针的斑点杂交技术得到的。躯干。同时,RA-ES-5细胞中Ⅰ,Ⅱ型受体的mRNA表达水平高于ES-5细胞。通过对TGF-β1的中和抗体进行预处理,发现两种细胞中TGF-β受体的下调均显着降低了细胞的增殖速率。本文讨论了TGF-β受体在细胞分化中的可能作用。

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