Abstract：
:The pericentriolar recycling endosome (RE) may be an alternative compartment through which some beta2-adrenergic receptors (beta2ARs) recycle from early endosomes to the cell surface during prolonged exposure to agonist. For the transferrin receptor, CXCR2, and the M4-muscarinic acetylcholine receptor, trafficking through the RE and receptor recycling is regulated by the small GTPase rab11. The precise role of the RE and rab11 in regulating the cellular trafficking of the beta2AR is not understood. We therefore monitored trafficking of beta2ARs in HEK293 cells following the modulation of rab11 activity. Expression of a rab11 mutant deficient in GTP binding (as a fusion between enhanced green fluorescent protein (EGFP) and the rab11S25N mutant) significantly slowed receptor recycling to the cell surface from dispersed transferrin-positive peripheral vesicles following a brief exposure to agonist. The agonist was applied at a time when receptors have undergone only one or two rounds of endocytosis and recycling. In cells overexpressing wild-type rab11, beta2ARs localized to a rab11-positive compartment and the rate of beta2AR recycling to the cell surface was reduced, but only after prolonged exposure to agonist and multiple rounds of receptor endocytosis and recycling. This effect was associated with impaired beta2AR trafficking to lysosomes and receptor proteolysis, whereas the sorting of low-density lipoprotein from transferrin-positive vesicles to late endosomes and lysosomes was not affected. These data highlight a pivotal role for rab11 in regulating the traffic of a G protein-coupled receptor at the level of the RE, where modulation of rab11 activity dictates the balance between receptor recycling and downregulation during prolonged exposure to agonist.
journal_name
J Cell Scijournal_title
Journal of cell scienceauthors
Moore RH,Millman EE,Alpizar-Foster E,Dai W,Knoll BJdoi
10.1242/jcs.01168keywords:
subject
Has Abstractpub_date
2004-07-01 00:00:00pages
3107-17issue
Pt 15eissn
0021-9533issn
1477-9137pii
jcs.01168journal_volume
117pub_type
杂志文章abstract：:We report a fast method for the isolation of homogeneous C-protein from bovine skeletal muscle. In electron micrographs C-protein appears as short rods with a relatively uniform length of about 50 nm. Protein sequencing shows a single N-terminal sequence. Radio-labelled C-protein strongly decorates titin II and myosin...
journal_title：Journal of cell science
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journal_title：Journal of cell science
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abstract：:The cell surface delivery of extracellular matrix (ECM) and integrins is fundamental for cell migration in wound healing and during cancer cell metastasis. This process is not only driven by several soluble NSF attachment protein (SNAP) receptor (SNARE) proteins, which are key players in vesicle transport at the cell ...
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更新日期：2015-03-15 00:00:00
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doi：
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journal_title：Journal of cell science
pub_type： 杂志文章
doi：
更新日期：1989-04-01 00:00:00
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pub_type： 杂志文章
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更新日期：2011-08-01 00:00:00
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更新日期：2013-04-15 00:00:00
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pub_type： 杂志文章,评审
doi：
更新日期：2000-12-01 00:00:00
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pub_type： 杂志文章
doi：
更新日期：2002-06-15 00:00:00
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更新日期：2017-05-15 00:00:00
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更新日期：2004-03-15 00:00:00
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doi：
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pub_type： 评论,杂志文章,评审
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journal_title：Journal of cell science
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更新日期：1999-08-01 00:00:00
