Journal
MOLECULAR AND CELLULAR BIOLOGY
Volume 30, Issue 3, Pages 781-792Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.00330-09
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Funding
- Optical Morphology Core of the Mayo Clinic Center [P30DK84567]
- [RO1-DK44650]
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The mechanisms by which epithelial cells regulate clathrin-mediated endocytosis (CME) of transferrin are poorly defined and generally viewed as a constitutive process that occurs continuously without regulatory constraints. In this study, we demonstrate for the first time that endocytosis of the transferrin receptor is a regulated process that requires activated Src kinase and, subsequently, phosphorylation of two important components of the endocytic machinery, namely, the large GTPase dynamin 2 (Dyn2) and its associated actin-binding protein, cortactin (Cort). To our knowledge these findings are among the first to implicate an Src-mediated endocytic cascade in what was previously presumed to be a nonregulated internalization process.
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