| 2003 |
SIMA135/CDCP1 is a type I transmembrane glycoprotein located on the cell surface, with up to 40 kDa of its apparent molecular weight attributable to N-glycosylation. It is tyrosine phosphorylated in tumor cells, and selective inhibitor studies indicated that a Src kinase family member is responsible for this phosphorylation. |
Immunopurification, Western blot with anti-phosphotyrosine antibody, selective Src kinase inhibitor studies, deglycosylation analysis |
Oncogene |
Medium |
12660814
|
| 2008 |
CDCP1 (Gp140) clusters in epithelial cell-cell contacts and is phosphorylated by Src Family Kinases at tyrosine 734 in response to outside-in signals. Active SFKs mediate phosphorylation of CDCP1, SFK, and PKCδ, with CDCP1 acting as a transmembrane scaffold for these kinases within membrane microdomains. |
Biochemical fractionation (Triton-resistant membrane domains), phosphorylation assays, cell biology experiments |
Biochimica et biophysica acta |
Medium |
18269919
|
| 2010 |
Full-length 135 kDa CDCP1 is post-translationally processed by serine protease activity (including matriptase) at two sites, Arg-368 and Lys-369, generating a C-terminal membrane-retained 70 kDa fragment and a shed N-terminal 65 kDa ectodomain. Proteolysis induces tyrosine phosphorylation of the 70 kDa fragment and recruitment of Src and PKCδ to this fragment. |
Immunopurification, N-terminal sequencing, detailed mutagenesis, protease inhibitor panel, Western blot, mass spectrometry |
The Journal of biological chemistry |
High |
20551327
|
| 2011 |
CDCP1 overexpression activates Src family kinases in melanoma cells, and the Y734F point mutation in CDCP1 abolishes Src activation, dispersive 3D growth in Matrigel, and in vivo metastasis-enhancing activity, establishing that Y734 is required for CDCP1's metastasis-promoting function through SFK activation. |
SILAC quantitative mass spectrometry, point mutagenesis (Y734F), 3D Matrigel culture, in vivo metastasis assay, pharmacological SFK inhibitors (PP2, Dasatinib) |
Proceedings of the National Academy of Sciences of the United States of America |
High |
21220330
|
| 2011 |
CDCP1-Tyr-734 and FAK-Tyr-861 compete as Src family kinase (SFK) substrates. Stable CDCP1 expression causes SFK-mediated phosphorylation of CDCP1-Y734 with concomitant loss of phospho-FAK-Y861, and this substrate switching is dependent on expression level and Y734 but not Y743 or Y762. FAK does not form a trimeric complex with Src and CDCP1. |
Stable CDCP1 expression in HeLa cells, phosphorylation analysis (Western blot), mutagenesis (Y734F, Y743F, Y762F), siRNA knockdown, co-immunoprecipitation (negative result for trimeric complex) |
The Journal of biological chemistry |
High |
21994943
|
| 2011 |
In vivo cleavage of CDCP1 by plasmin (identified as the crucial extracellular serine protease) triggers a survival signaling cascade: serine-protease-mediated 135→70 kDa CDCP1 cleavage recruits Src and PKCδ, Src-mediated phosphorylation of 70 kDa CDCP1 activates Akt, and suppresses PARP1-mediated apoptosis. Preventing CDCP1 cleavage with antibodies, protease inhibitors, or genetic mutation of the cleavage site abrogates this signaling and induces apoptosis. |
Anti-CDCP1 cleavage-blocking antibodies, serine protease inhibitors, genetic cleavage-site mutagenesis, plasminogen-knockout mice, lung retention model, Western blot for Src/PKCδ/Akt/PARP1 |
Oncogene |
High |
22179830
|
| 2012 |
Proteolytic cleavage of CDCP1 by plasmin-like serine proteases generates a membrane-retained 70 kDa fragment that complexes preferentially with active (inside-out activated) β1 integrin, both in cell culture and in live animals. This complex activates intracellular FAK and PI3K/Akt signaling, promoting tumor cell intravasation and metastasis. Inhibition of FAK/PI3K or shRNA knockdown of β1 integrin reduces FAK/Akt phosphorylation downstream of cleaved CDCP1. |
Co-immunoprecipitation (cell culture and in vivo), cleavage-blocking antibody (10-D7), aprotinin (serine protease inhibition), FAK/PI3K inhibitors, β1 integrin shRNA, spontaneous metastasis assays in vivo |
Oncogene |
High |
23208492
|
| 2012 |
CDCP1 is required for ECM degradation by invadopodia in breast cancer and melanoma cells. CDCP1 localizes to caveolin-1-containing vesicular structures and lipid rafts and co-immunoprecipitates with MT1-MMP, regulating its trafficking and accumulation at invadopodia; siRNA knockdown of CDCP1 markedly reduces MT1-MMP-dependent ECM degradation and Matrigel invasion. |
siRNA knockdown, co-immunoprecipitation (CDCP1 with MT1-MMP), immunofluorescence, lipid raft fractionation (Triton X-100 insoluble fraction), Matrigel invasion assay |
Molecular cancer research : MCR |
High |
23439492
|
| 2013 |
HIF-2α (but not HIF-1α) directly induces CDCP1 expression and tyrosine phosphorylation under hypoxia. shRNA knockdown of CDCP1 impairs cancer cell migration under hypoxic conditions, establishing CDCP1 as a downstream HIF-2α target gene mediating hypoxia-driven metastasis. |
shRNA knockdown of HIF-2α and HIF-1α, shRNA knockdown of CDCP1, hypoxic cell migration assay, HIF-2α overexpression in xenografts |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
23378636
|
| 2013 |
Antibody-induced CDCP1 clustering/dimerization transiently induces tyrosine phosphorylation of CDCP1 by Src, causes translocation of CDCP1 to a Triton X-100 insoluble fraction of the plasma membrane (requiring bivalency of the antibody), and subsequently triggers internalization and proteasome-dependent degradation of CDCP1 in a Src-dependent manner. |
Focus formation assay (NIH3T3 co-transformation with CDCP1 and Src), antibody (RG7287) treatment, Western blot for CDCP1 phosphorylation and levels, detergent-resistant membrane fractionation, xenograft models |
Molecular oncology |
Medium |
24055141
|
| 2014 |
Oncogenic Ras/ERK signaling induces CDCP1 expression in lung cancer cells; CDCP1 knockdown or inhibition of CDCP1 phosphorylation by Src-directed therapy abrogates anoikis resistance, migration, invasion, and Ras-induced MMP2 activation/MMP9 secretion. CDCP1 is therefore required for the functional link between Ras and Src signaling. |
CDCP1 knockdown (siRNA/shRNA), Src-directed therapy, anoikis assay, migration assay, invasion assay, zymography (MMP2/MMP9), Ras mutant lung cancer cells |
Molecular cancer research : MCR |
Medium |
24939643
|
| 2014 |
Under basal conditions, cell-surface CDCP1 constitutively internalizes and undergoes palmitoylation-dependent proteasomal degradation, palmitoylated at one or more cytoplasmic cysteines. EGF/EGFR activation inhibits this palmitoylation-dependent degradation, promotes recycling of CDCP1 to the cell surface, and increases cell migration. Disruption of CDCP1 palmitoylation also promotes its relocalization to the cell surface and cell migration. |
Palmitoylation site mutagenesis (cytoplasmic cysteines), EGF treatment, proteasome inhibitors, live-cell imaging/internalization assays, cell migration assay, in vivo palmitoylation detection in tumor samples |
Oncogene |
High |
24681947
|
| 2015 |
CDCP1 binds to HER2 through its intracellular domain, increasing HER2 interaction with c-SRC, which enhances HER2 activation and downstream signaling and confers trastuzumab resistance in breast cancer cells. |
Co-immunoprecipitation (CDCP1 with HER2 and c-SRC), CDCP1 domain truncation analysis, cell migration, transformation, and in vivo tumor formation assays, trastuzumab resistance assays |
Cell reports |
High |
25892239
|
| 2015 |
The tyrosine phosphatase SHP2 directly interacts with CDCP1 via its phosphorylated Y734 and Y743 residues (as shown by point mutants), potentially competing with SFK binding. shRNA-mediated downregulation of SHP2 results in stronger CDCP1 phosphorylation and impaired antibody-mediated CDCP1 internalization. |
Co-immunoprecipitation, affinity precipitation, CDCP1 point mutants (Y734A, Y743A), SHP2 shRNA knockdown |
PloS one |
Medium |
25876044
|
| 2016 |
Only the cleaved form of CDCP1 (cCDCP1), not full-length CDCP1, is capable of homodimerization through its ectodomain, and only cCDCP1 induces phosphorylation of PKCδ, ERK1/2, and p38 MAPK and promotes cell migration. A blocking fragment of the cCDCP1 ectodomain (ECC) inhibits dimerization, PKCδ phosphorylation, and TNBC cell migration. |
Expression of full-length vs. cleaved CDCP1 constructs in HEK 293T, co-immunoprecipitation for dimerization, phosphorylation analysis (Western blot), migration rescue assay in CDCP1-shRNA TNBC lines, ECC blocking fragment |
Oncogene |
High |
26876198
|
| 2017 |
CDCP1 drives a 'low-lipid' phenotype in triple-negative breast cancer by interacting with and inhibiting acyl CoA-synthetase ligase (ACSL) activity, reducing acyl-CoA production and increasing fatty acid oxidation (FAO) and oxidative phosphorylation in mitochondria. CDCP1 knockdown increases lipid droplet abundance and reduces migration, rescued by the ACSL inhibitor Triacsin C or ACSL3 co-knockdown. |
CDCP1 knockdown and rescue experiments, coherent anti-Stokes Raman scattering (CARS) and two-photon excited fluorescence microscopy (lipid droplet imaging), ACSL activity assay, Co-IP (CDCP1 with ACSL), in vivo animal models of TNBC with blocking fragment treatment |
Proceedings of the National Academy of Sciences of the United States of America |
High |
28739932
|
| 2017 |
CD318/CDCP1 is a ligand for CD6. Soluble CD318 is chemoattractive to T cells, and CD318 participates in CD6-dependent adhesion of T cells to synovial fibroblasts. CD318 knockout mice are protected in experimental autoimmune encephalomyelitis, phenocopying CD6 KO mice. |
Identification via mAb 3A11, CD318 knockout mice in EAU model, T cell adhesion assay, T cell chemotaxis assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
28760953
|
| 2018 |
Loss of CDCP1 reduces CDK5 kinase activity via a mechanism in which c-SRC phosphorylates CDK5R1/p35 on Y234, creating a binding site for the C2 domain of PKCδ, which in turn phosphorylates CDK5 on T77, causing dissociation of the CDK5R1/CDK5 complex and abolishing CDK5 activity. This loss of CDK5 activity reduces inside-out activation of β1 integrin, impairing cell adhesion and migration. |
CDCP1 siRNA silencing, phosphorylation mapping (CDK5R1-Y234, CDK5-T77), CDK5 phosphorylation site mutants (T77 and Y234), PKCδ C2 domain binding assay, β1 integrin inside-out activation assay, cell adhesion and migration assays |
Oncogene |
High |
29511352
|
| 2018 |
FBXL14 E3 ubiquitin ligase directly interacts with CDCP1 and facilitates its ubiquitination and proteasomal degradation, thereby reducing CDCP1 protein stability. miR-17/20a suppress FBXL14, establishing an upstream regulatory mechanism for CDCP1 protein levels. |
Co-immunoprecipitation (CDCP1 with FBXL14), ubiquitination assay, proteasome inhibitor experiments, miR-17/20a overexpression |
Oncogene |
Medium |
29973690
|
| 2019 |
CDCP1 promotes Wnt signaling in colorectal cancer by facilitating nuclear translocation of β-catenin and E-cadherin. Disruption of CDCP1 reduces nuclear chromatin-associated β-catenin and nuclear E-cadherin, increases sequestration of these proteins at cell membranes, and disrupts regulation of CRC-promoting genes. |
Cell fractionation, immunoprecipitation, immunofluorescence microscopy, immunohistochemistry, CDCP1 loss-of-function, in vitro and in vivo tumor models |
Oncogene |
Medium |
31471585
|
| 2019 |
CDCP1 CUB domains bind directly to TGF-β1 and BMP4 (real-time protein interaction on BIAcore chip). CDCP1 enhances TGF-β1 signaling (reporter activity and phospho-Smad2 levels) but does not modulate BMP signaling. CDCP1 actions on TGF-β/Smad2 signaling require Smad2 and TGFRI but are independent of Src or PKCδ binding. |
BIAcore surface plasmon resonance (direct binding to TGF-β1 and BMP4), TGF-β reporter assay, phospho-Smad2 Western blot, siRNA knockdown of Smad2/TGFRI/Src/PKCδ |
Experimental cell research |
High |
31302030
|
| 2019 |
CDCP1 forms a homophilic complex via its extracellular CUB2 domain; deletion of the extracellular region abolishes complex formation. The homophilic complex activates SFK on the plasma membrane and promotes cancer cell migration. A recombinant CUB2 domain protein (rMBP-CUB2) inhibits CDCP1 homophilic complex formation, SFK activation, and cancer cell migration. |
Deletion mutants, co-immunoprecipitation for dimerization, recombinant CUB2 domain blocking experiment, SFK phosphorylation assay, cancer cell migration assay |
Oncology reports |
Medium |
31524271
|
| 2019 |
METTL3 and m6A reader YTHDF1 recognize m6A residues on CDCP1 3'-UTR mRNA and promote CDCP1 translation. ALKBH5 demethylase opposes this modification. Inhibition of the METTL3-m6A-CDCP1 axis reduces growth of transformed and bladder cancer cells. |
m6A profiling, METTL3/ALKBH5 knockdown, YTHDF1 binding assay, CDCP1 translation assay, in vitro and in vivo functional assays |
Oncogene |
Medium |
30796352
|
| 2021 |
Urokinase (uPA) is identified as the master regulator of CDCP1 proteolysis, acting both by directly cleaving CDCP1 and by activating plasmin (which also cleaves CDCP1). uPA-mediated CDCP1 proteolysis promotes metastasis in disease-relevant preclinical in vivo models, and co-expression of uPA and CDCP1 is strongly predictive of poor disease outcome across multiple cancers. |
Substrate-biased activity-based probe (sbABP) incorporating CDCP1 cleavage motif, protease capture/isolation/identification (MS), in vivo metastasis models |
Nature chemical biology |
High |
33859413
|
| 2021 |
CDCP1 on dendritic cells (DCs) is required for IL-6 production during Kawasaki disease model induction. CAWS stimulation upregulates CDCP1 on DCs, and CDCP1 KO DCs show significantly reduced IL-6 production associated with impaired Syk-MAPK signaling pathway activation. |
CDCP1 knockout mice, CAWS-induced Kawasaki disease model, IL-6 ELISA, immunostaining (DC subsets), Syk-MAPK pathway analysis |
Journal of immunology |
Medium |
34099547
|
| 2022 |
Biochemical and biophysical characterization (SPR, structural analysis) revealed that the two cleaved fragments of CDCP1 remain tightly associated with minimal conformational change after proteolysis. Antibodies that selectively bind the proteolytic neoepitope of cleaved CDCP1 (with no detectable binding to uncleaved form) potently target cleaved CDCP1-expressing cancer cells as ADC, Ab-radionuclide conjugate, and bispecific T cell engager. |
Biochemical characterization, biophysical analysis (SPR), structural characterization, differential phage display to generate cleavage-selective antibodies, syngeneic pancreatic tumor model |
The Journal of clinical investigation |
High |
35166238
|
| 2022 |
CDCP1 promotes HGF-induced cell migration and invasion by activating SRC kinase; in breast cancer cells, CDCP1 facilitates MET activation by HGF and promotes lamellipodia formation. CDCP1 expression activates small GTPase Rac1 via guanine nucleotide exchange factor ARHGEF7, which co-accumulates with CDCP1, establishing a CDCP1-SRC-ARHGEF7-RAC1 pathway. |
CDCP1 knockdown and ectopic expression, HGF stimulation assays, Rac1 activation assay, ARHGEF7 knockdown, immunofluorescence (CDCP1/ARHGEF7 colocalization), migration/invasion assays |
The Journal of biological chemistry |
Medium |
35085554
|
| 2021 |
CDCP1 promotes HGF-induced compensatory renal growth by recruiting Src into lipid rafts to activate STAT3 associated with the HGF receptor Met; activated STAT3 induces expression of matrix metalloproteinases and mitogenic factors. CDCP1 ablation attenuates regenerative Met-STAT3 signaling after unilateral nephrectomy in mice. |
CDCP1 ablation in canine kidney cells, lipid raft fractionation (Src recruitment), STAT3 phosphorylation analysis (association with Met), MMP and mitogenic factor expression assay, unilateral nephrectomy mouse model |
Life science alliance |
Medium |
33574034
|
| 2022 |
CDCP1 on RPE cells is upregulated by IFN-γ. CD6 stimulation of RPE cells induces increased barrier permeability, massive stress fiber formation, and focal adhesion disruption reducing tight junctions, facilitating T cell infiltration. This CD6-stimulated barrier disruption is abrogated by CDCP1 knockdown, establishing that CDCP1 mediates CD6-driven RPE cytoskeleton remodeling. |
CDCP1 knockdown in RPE cells, IFN-γ stimulation, CD6 stimulation, transwell T cell migration assay, RPE monolayer permeability assay, immunostaining for stress fibers and focal adhesions, EAU mouse model (CDCP1 KO) |
JCI insight |
Medium |
35951427
|
| 2017 |
CDCP1 expression is inhibited by the microRNA miR-1, which directly targets the 3'-UTR of CDCP1 mRNA. ADAM9 promotes CDCP1 expression by activating EGFR signaling, which in turn suppresses miR-1 expression, establishing an ADAM9-EGFR-miR-1-CDCP1 regulatory axis. |
Luciferase reporter assay (miR-1 binding to CDCP1 3'-UTR), ADAM9 knockdown, EGFR signaling analysis, miR-1 inhibitor/mimic experiments, in vivo metastasis/survival assay |
Oncotarget |
Medium |
28537886
|
| 2025 |
CDCP1 knockdown in vascular smooth muscle cells (VSMCs) inhibits PDGFRβ endocytosis by promoting PDGFRβ binding to NEDD4 and its ubiquitination, and attenuating PDGFRβ binding to clathrin and Rab5. This leads to reduced AKT signaling and decreased VSMC proliferation and migration. |
CDCP1 siRNA knockdown, RNA-seq, co-immunoprecipitation (PDGFRβ with NEDD4, clathrin, Rab5), immunofluorescence, CCK8 proliferation assay, wound healing assay, focal carotid stenosis in vivo model |
PeerJ |
Medium |
40256729
|
| 2012 |
For CDCP1/Src-dependent cellular transformation, the intact amino- and carboxy-termini of CDCP1 are essential. Mutation of any of the three core intracellular tyrosine residues (Y734, Y743, or Y762) abolishes transformation capacity, and mutation of a palmitoylation motif (C689,690G) strongly reduces it. Src kinase binding to CDCP1 via its SH2 domain is not required for transformation, but Src myristoylation is necessary. |
Retrovirus-mediated co-overexpression of c-Src and CDCP1 in NIH3T3 cells, focus formation assay, CDCP1 truncation and point mutants (Y734F, Y743F, Y762F, C689/690G), Src SH2 domain mutant |
PloS one |
High |
23300860
|
| 2014 |
CDCP1 and the tetraspanin CD9 are co-expressed and form a low-level but detectable complex in colon cancer cells, as shown by co-sedimentation in sucrose gradients and co-immunoprecipitation. CDCP1 modulates cell-substratum adhesion and serum-induced chemotaxis in colon cancer cell lines. |
Co-immunoprecipitation, density gradient centrifugation, siRNA knockdown, Matrigel adhesion assay, xCELLigence chemotaxis assay |
BMC cancer |
Low |
25301083
|
| 2020 |
CDCP1 is transferred from metastatic prostate cancer cells to osteoclast precursors via extracellular vesicles (EVs) and promotes osteoclastogenesis in the presence of RANKL. Functional siRNA screening of EV cargo identified CDCP1 as the specific inducer of osteoclast formation. |
EV characterization, functional siRNA screening of EV cargo, osteoclastogenesis assay in presence of RANKL |
Journal of extracellular vesicles |
Medium |
36880252
|
| 2025 |
Glycosylation of CDCP1 at N339 and N386 are identified as critical functional determinants. CDCP1 knockout reduces SRC and JUN phosphorylation (ErbB signaling pathway markers by 5.5-fold and 4.2-fold respectively) and reduces cancer cell migration. CDCP1 is selectively enriched in extracellular vesicles from highly metastatic lung cancer cells. |
CDCP1 knockout (KO) in lung cancer cells, intact glycopeptide enrichment with site-specific glycoform profiling, Ti4+-IMAC phosphoproteomics, site-specific glycosylation mutagenesis (N339, N386), migration assays, EV/cell co-culture |
Journal of extracellular vesicles |
Medium |
40693605
|