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Article . 2007 . Peer-reviewed
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Article . 2008
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Vps22/EAP30 in ESCRT‐II Mediates Endosomal Sorting of Growth Factor and Chemokine Receptors Destined for Lysosomal Degradation

Authors: Lene, Malerød; Susanne, Stuffers; Andreas, Brech; Harald, Stenmark;

Vps22/EAP30 in ESCRT‐II Mediates Endosomal Sorting of Growth Factor and Chemokine Receptors Destined for Lysosomal Degradation

Abstract

The ubiquitin‐binding protein Hrs and endosomal sorting complex required for transport (ESCRT)‐I and ESCRT‐III are involved in sorting endocytosed and ubiquitinated receptors to lysosomes for degradation and efficient termination of signaling. In this study, we have investigated the role of the ESCRT‐II subunit Vps22/EAP30 in degradative protein sorting of ubiquitinated receptors. Vps22 transiently expressed in HeLa cells was detected in endosomes containing endocytosed epidermal growth factor receptors (EGFRs) as well as Hrs and ESCRT‐I and ESCRT‐III. Depletion of Vps22 by small interfering RNA, which was accompanied by decreased levels of other ESCRT‐II subunits, greatly reduced degradation of EGFR and its ligand EGF as well as the chemokine receptor CXCR4. EGFR accumulated on the limiting membranes of early endosomes and aberrantly small multivesicular bodies in Vps22‐depleted cells. Phosphorylation and nuclear translocation of extracellular‐signal‐regulated kinase1/2 downstream of the EGF‐activated receptor were sustained by depletion of Hrs or the ESCRT‐I subunit Tsg101. In contrast, this was not the case when Vps22 was depleted. These results indicate an important role for Vps22 in ligand‐induced EGFR and CXCR4 turnover and suggest that termination of EGF signaling occurs prior to ESCRT‐II engagement.

Related Organizations
Keywords

Microscopy, Confocal, Saccharomyces cerevisiae Proteins, Endosomal Sorting Complexes Required for Transport, Epidermal Growth Factor, Ubiquitin, Proteins, Endosomes, Models, Biological, Receptors, G-Protein-Coupled, Protein Transport, Microscopy, Fluorescence, Humans, Receptors, Chemokine, Phosphorylation, RNA, Small Interfering, Lysosomes, HeLa Cells, Plasmids, Signal Transduction

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    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    105
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
105
Top 10%
Top 10%
Top 10%
bronze