Abstract：
:CUB domain-containing protein 1 (CDCP1) is a membrane protein that is highly expressed in several solid cancers. We reported previously that CDCP1 regulates anoikis resistance as well as cancer cell migration and invasion, although the underlying mechanisms have not been elucidated. In this study, we found that expression of CDCP1 in pancreatic cancer tissue was significantly correlated with overall survival and that CDCP1 expression in pancreatic cancer cell lines was relatively high among solid tumor cell lines. Reduction of CDCP1 expression in these cells suppressed extracellular matrix (ECM) degradation by inhibiting matrix metalloproteinase-9 secretion. Using the Y734F mutant of CDCP1, which lacks the tyrosine phosphorylation site, we showed that CDCP1 regulates cell migration, invasion, and ECM degradation in a tyrosine phosphorylation-dependent manner and that these CDCP1-associated characteristics were inhibited by blocking the association of CDCP1 and protein kinase Cdelta (PKCdelta). CDCP1 modulates the enzymatic activity of PKCdelta through the tyrosine phosphorylation of PKCdelta by recruiting PKCdelta to Src family kinases. Cortactin, which was detected as a CDCP1-dependent binding partner of PKCdelta, played a significant role in migration and invasion but not in ECM degradation of pancreatic cells. These results suggest that CDCP1 expression might play a crucial role in poor outcome of pancreatic cancer through promotion of invasion and metastasis and that molecules blocking the expression, phosphorylation, or the PKCdelta-binding site of CDCP1 are potential therapeutic candidates.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Miyazawa Y,Uekita T,Hiraoka N,Fujii S,Kosuge T,Kanai Y,Nojima Y,Sakai Rdoi
10.1158/0008-5472.CAN-10-0220subject
Has Abstractpub_date
2010-06-15 00:00:00pages
5136-46issue
12eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-10-0220journal_volume
70pub_type
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