Abstract
Autocrine motility factor receptor (AMF-R) is a cell surface receptor that is also localized to a smooth subdomain of the endoplasmic reticulum, the AMF-R tubule. By postembedding immunoelectron microscopy, AMF-R concentrates within smooth plasmalemmal vesicles or caveolae in both NIH-3T3 fibroblasts and HeLa cells. By confocal microscopy, cell surface AMF-R labeled by the addition of anti-AMF-R antibody to viable cells at 4°C exhibits partial colocalization with caveolin, confirming the localization of cell surface AMF-R to caveolae. Labeling of cell surface AMF-R by either anti-AMF-R antibody or biotinylated AMF (bAMF) exhibits extensive colocalization and after a pulse of 1–2 h at 37°C, bAMF accumulates in densely labeled perinuclear structures as well as fainter tubular structures that colocalize with AMF-R tubules. After a subsequent 2- to 4-h chase, bAMF is localized predominantly to AMF-R tubules. Cytoplasmic acidification, blocking clathrin-mediated endocytosis, results in the essentially exclusive distribution of internalized bAMF to AMF-R tubules. By confocal microscopy, the tubular structures labeled by internalized bAMF show complete colocalization with AMF-R tubules. bAMF internalized in the presence of a 10-fold excess of unlabeled AMF labels perinuclear punctate structures, which are therefore the product of fluid phase endocytosis, but does not label AMF-R tubules, demonstrating that bAMF targeting to AMF-R tubules occurs via a receptor-mediated pathway. By electron microscopy, bAMF internalized for 10 min is located to cell surface caveolae and after 30 min is present within smooth and rough endoplasmic reticulum tubules. AMF-R is therefore internalized via a receptor-mediated clathrin-independent pathway to smooth ER. The steady state localization of AMF-R to caveolae implicates these cell surface invaginations in AMF-R endocytosis.
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Dates
Type | When |
---|---|
Created | 12 years, 1 month ago (July 2, 2013, 7:13 p.m.) |
Deposited | 3 years, 6 months ago (Feb. 26, 2022, 9:36 p.m.) |
Indexed | 1 month, 4 weeks ago (July 2, 2025, 3:10 p.m.) |
Issued | 27 years, 2 months ago (July 1, 1998) |
Published | 27 years, 2 months ago (July 1, 1998) |
Published Print | 27 years, 2 months ago (July 1, 1998) |
@article{Benlimame_1998, title={Localization of Autocrine Motility Factor Receptor to Caveolae and Clathrin-independent Internalization of Its Ligand to Smooth Endoplasmic Reticulum}, volume={9}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.9.7.1773}, DOI={10.1091/mbc.9.7.1773}, number={7}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Benlimame, Naciba and Le, Phuong U. and Nabi, Ivan R.}, year={1998}, month=jul, pages={1773–1786} }