Journal
JOURNAL OF CELL SCIENCE
Volume 128, Issue 24, Pages 4629-4641Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jcs.176081
Keywords
Cadherin-11; Clathrin; Endocytosis; Migration; Prostate cancer
Categories
Funding
- National Institutes of Health [P50 CA140388, CA174798, CA16672]
- Prostate Cancer Foundation
- Cancer Prevention and Research Institute of Texas [CPRIT RP110327, RP150179, RP150282]
- Sister Institute Network Fund
- Institutional Research Grant (IRG) Program at the MD Anderson Cancer Center
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Cadherin-11 (Cad11) cell adhesion molecule plays a role in prostate cancer cell migration. Because disassembly of adhesion complexes through endocytosis of adhesion proteins has been shown to play a role in cell migration, we examined whether Cad11 endocytosis plays a role in Cad11-mediated migration. The mechanism by which Cad11 is internalized is unknown. Using a GST pulldown assay, we found that clathrin binds to the Cad11 cytoplasmic domain but not to that of E-cadherin. Using deletion analysis, we identified a unique sequence motif, VFEEE, in the Cad11 membrane proximal region (amino acid residues 11-15) that binds to clathrin. Endocytosis assays using K+-depletion buffer showed that Cad11 internalization is clathrin dependent. Proximity ligation assays showed that Cad11 colocalizes with clathrin, and immunofluorescence assays showed that Cad11 localizes in vesicles that stain for the early endosomal marker Rab5. Deletion of the VFEEE sequence from the Cad11 cytoplasmic domain (Cad11-cla-Delta 5) leads to inhibition of Cad11 internalization and reduces Cad11-mediated cell migration in C4-2B and PC3-mm2 prostate cancer cells. These observations suggest that clathrin-mediated internalization of Cad11 regulates surface trafficking of Cad11 and that dynamic turnover of Cad11 regulates the migratory function of Cad11 in prostate cancer cells.
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