Abstract:
:Cytokinesis is the final step of cell division. Increasing evidence suggests failure of cytokinesis might contribute to the development of cancer. Here, we demonstrate that the serologically defined colon cancer antigen-3 (SDCCAG3) forms a complex with PTPN13, a protein tyrosine phosphatase known to be involved in the regulation of cytokinesis, carcinogenesis and tumor aggressiveness. We show that SDCCAG3 is a novel endosomal protein, primarily localized at the early/recycling endosomal compartment. SDCCAG3 undergoes dynamic localization during cell division with strong accumulation at the midbody during cytokinesis. Overexpression as well as downregulation correlates with the generation of multinucleate cells. Furthermore, we show interaction of SDCCAG3 with the Arf GTPase activating protein GIT1 (G protein-coupled receptor kinase interactor-1). Overexpression of an ArfGAP-negative version of GIT1 also results in an increased number of multinucleate cells suggesting regulation of Arf-mediated vesicular trafficking or signaling via SDCCAG3. Finally, we demonstrate that SDCCAG3 expression levels are elevated in colon cancers. In summary, we have established SDCCAG3 as a novel endosomal protein, which is involved in the regulation of cytokinesis.
journal_name
Oncogenejournal_title
Oncogeneauthors
Hagemann N,Ackermann N,Christmann J,Brier S,Yu F,Erdmann KSdoi
10.1038/onc.2012.485subject
Has Abstractpub_date
2013-09-26 00:00:00pages
4602-13issue
39eissn
0950-9232issn
1476-5594pii
onc2012485journal_volume
32pub_type
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