The glycophospholipid-linked folate receptor internalizes folate without entering the clathrin-coated pit endocytic pathway.

The glycophospholipid-linked folate receptor internalizes folate without entering the clathrin-coated pit endocytic pathway.
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DOI:
10.1083/jcb.110.3.637
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发表时间:
1990-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Anderson RG
Anderson RG
中科院分区:
其他
文献类型:
--
作者:
Rothberg KG;Ying YS;Kolhouse JF;Kamen BA;Anderson RG

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The folate receptor, also known as the membrane folate-binding protein, is maximally expressed on the surface of folate-depleted tissue culture cells and mediates the high affinity accumulation of 5- methyltetrahydrofolic acid in the cytoplasm of these cells. Recent evidence suggests that this receptor recycles during folate internalization and that it is anchored in the membrane by a glycosyl- phosphatidylinositol linkage. Using quantitative immunocytochemistry, we now show that (a) this receptor is highly clustered on the cell surface; (b) these clusters are preferentially associated with uncoated membrane invaginations rather than clathrin-coated pits; and (c) the receptor is not present in endosomes or lysosomes. This receptor appears to physically move in and out of the cell using a novel uncoated pit pathway that does not merge with the clathrin-coated pit endocytic machinery.
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高渗培养基通过阻断网状蛋白包被的凹坑的形成来抑制受体介导的内吞作用。
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发表时间: 1989-02
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