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Clathrin-independent carriers form a high capacity endocytic sorting system at the leading edge of migrating cells
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2010 (English)In: Journal of Cell Biology, ISSN 0021-9525, E-ISSN 1540-8140, Vol. 190, no 4, 675-691 p.Article in journal (Refereed) Published
Abstract [en]

Although the importance of clathrin- and caveolin-independent endocytic pathways has recently emerged, key aspects of these routes remain unknown. Using quantitative ultrastructural approaches, we show that clathrin-independent carriers (CLICs) account for approximately three times the volume internalized by the clathrin-mediated endocytic pathway, forming the major pathway involved in uptake of fluid and bulk membrane in fibroblasts. Electron tomographic analysis of the 3D morphology of the earliest carriers shows that they are multidomain organelles that form a complex sorting station as they mature. Proteomic analysis provides direct links between CLICs, cellular adhesion turnover, and migration. Consistent with this, CLIC-mediated endocytosis of key cargo proteins, CD44 and Thy-1, is polarized at the leading edge of migrating fibroblasts, while transient ablation of CLICs impairs their ability to migrate. These studies provide the first quantitative ultrastructural analysis and molecular characterization of the major endocytic pathway in fibroblasts, a pathway that provides rapid membrane turnover at the leading edge of migrating cells.

Place, publisher, year, edition, pages
Rockefeller University Press, 2010. Vol. 190, no 4, 675-691 p.
National Category
Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)
Identifiers
URN: urn:nbn:se:umu:diva-84000DOI: 10.1083/jcb.201002119ISI: 000281481800020PubMedID: 20713605OAI: oai:DiVA.org:umu-84000DiVA: diva2:678495
Available from: 2013-12-12 Created: 2013-12-12 Last updated: 2017-12-06Bibliographically approved

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Lundmark, Richard
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Department of Medical Biochemistry and Biophysics
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