Electron microscopic evidence for externalization of the transferrin receptor in vesicular form in sheep reticulocytes.

Electron microscopic evidence for externalization of the transferrin receptor in vesicular form in sheep reticulocytes.
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DOI:
10.1083/jcb.101.3.942
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发表时间:
1985-09
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Johnstone RM
Johnstone RM
中科院分区:
其他
文献类型:
--
作者:
Pan BT;Teng K;Wu C;Adam M;Johnstone RM

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使用铁蛋白标记的蛋白 A 和胶体金标记的抗兔 IgG,在体外网织红细胞成熟过程中用显微镜观察了绵羊转铁蛋白受体的命运。在 37°C 下孵育几分钟后,在细胞表面或 100-200 nm 的简单囊泡中发现受体,其中受体似乎排列在囊泡的限制膜上。随着时间的推移(60分钟或更长时间),出现大的多泡元件(MVE),其直径可能达到1-1.5微米。这些大型 MVE 内部是直径约为 50 nm 的圆形物体,其外表面带有受体。大MVE的限制膜相对没有受体。当大的 MVE 与质膜融合时,它们的内容物(50 nm 的小体)被释放到介质中。 50 nm 的小体似乎是由细胞内囊泡的限制膜出芽而产生的。用链霉蛋白酶去除表面受体并不能阻止内化受体的胞吐作用。有人提出,大约 50 nm 小体的胞吐作用代表了网织红细胞成熟过程中转铁蛋白受体脱落的机制。
Using ferritin-labeled protein A and colloidal gold-labeled anti-rabbit IgG, the fate of the sheep transferrin receptor has been followed microscopically during reticulocyte maturation in vitro. After a few minutes of incubation at 37 degrees C, the receptor is found on the cell surface or in simple vesicles of 100-200 nm, in which the receptor appears to line the limiting membrane of the vesicles. With time (60 min or longer), large multivesicular elements (MVEs) appear whose diameter may reach 1-1.5 micron. Inside these large MVEs are round bodies of approximately 50-nm diam that bear the receptor at their external surfaces. The limiting membrane of the large MVEs is relatively free from receptor. When the large MVEs fuse with the plasma membrane, their contents, the 50-nm bodies, are released into the medium. The 50-nm bodies appear to arise by budding from the limiting membrane of the intracellular vesicles. Removal of surface receptor with pronase does not prevent exocytosis of internalized receptor. It is proposed that the exocytosis of the approximately 50-nm bodies represents the mechanism by which the transferrin receptor is shed during reticulocyte maturation.
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