| 1987 |
NCAM is a member of the immunoglobulin superfamily with five contiguous Ig-like domains in its extracellular region. Three major polypeptide isoforms (120, 140, 180 kDa) share an identical extracellular region but differ in their membrane-associated and cytoplasmic domains through alternative RNA splicing. Homophilic binding is mediated by interactions among the Ig-like domains, and regulation is achieved not by changes in binding-site sequence but by cell surface modulation events (PSA content, prevalence, mobility) and alternative splicing that alter isoform-specific cytoplasmic interactions. |
cDNA cloning, amino acid sequencing of CNBr/proteolytic fragments, Northern blot |
Science |
High |
3576199
|
| 1987 |
A muscle-specific sequence domain (MSD1) of 37 amino acids is present in the extracellular region of the 5.2 and 4.3 kb NCAM isoforms expressed during myotube formation but absent from transmembrane isoforms in myoblasts and from brain NCAM, demonstrating tissue-specific alternative splicing within the extracellular domain. |
cDNA cloning, Northern blot, sequencing |
Cell |
High |
2887295
|
| 1988 |
A secreted isoform of NCAM is generated by alternative splicing that inserts a novel exon into the extracellular domain, introducing an in-frame stop codon; stable transfectants expressing this isoform accumulate it intracellularly and secrete it into the medium, contrasting with GPI-anchored NCAM that is expressed at the cell surface. |
cDNA cloning, genomic analysis, stable transfection, immunoprecipitation |
Cell |
High |
3203385
|
| 1988 |
NCAM regulates membrane-membrane contact required for diverse intercellular events. When NCAM carries low polysialic acid (PSA), adhesion is increased and contact-dependent signaling is triggered; when PSA content is high, the large excluded volume of PSA sterically inhibits membrane apposition and cell-cell interactions. |
Cell adhesion assays, enzymatic PSA removal, antibody blocking |
Science |
High |
3281256
|
| 1990 |
Mouse myoblasts transfected to constitutively express the human muscle-specific 125 kDa GPI-linked NCAM isoform fuse more readily to form myotubes than controls, demonstrating that NCAM promotes myoblast fusion and that the isoform switch (transmembrane to GPI-linked) may promote this function. |
Stable transfection of myoblasts, fusion assay |
Nature |
High |
2179732
|
| 1993 |
The fourth Ig-like domain of NCAM contains a carbohydrate recognition domain (with sequence homology to C-type lectins) that mediates binding to oligomannosidic glycans on L1, forming a heterophilic cis-complex. A peptide from this domain disrupts L1-NCAM association and inhibits neurite outgrowth, demonstrating that carbohydrate-mediated cis-association between L1 and NCAM modulates their functional properties. |
Co-immunoprecipitation, carbohydrate inhibition assays, recombinant domain binding, peptide inhibition, neurite outgrowth assay |
The Journal of cell biology |
High |
8509458
|
| 1993 |
Expression of the transmembrane NCAM-B isoform (but not GPI-linked NCAM-C) in NCAM-negative rat glioma cells induces down-regulation of 92-kDa gelatinase (MMP-9) and interstitial collagenase (MMP-1) secretion, indicating that transmembrane NCAM signaling regulates extracellular matrix metalloproteinase production. |
Transfection of NCAM isoforms into glioma cells, metalloproteinase zymography/activity assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
8265575
|
| 1994 |
The VASE exon (10 amino acids inserted into the fourth Ig domain) in NCAM receptors specifically inhibits NCAM-stimulated neurite outgrowth. Both the 140- and 180-kDa isoforms without VASE are functional receptors for neurite outgrowth; a VASE-containing peptide inhibits NCAM-dependent but not integrin-, N-cadherin-, or L1-dependent neurite outgrowth, suggesting that VASE prevents NCAM from engaging the FGF receptor. |
PC12 transfection with NCAM isoforms ± VASE, synthetic peptide inhibition, neurite outgrowth assay |
The Journal of cell biology |
High |
8163558
|
| 1995 |
Polysialylation of NCAM is catalyzed by a single enzyme, PST-1 (polysialyltransferase-1), as demonstrated by reconstitution of PSA synthesis on incompletely glycosylated NCAM variants in vitro using soluble recombinant enzyme. Terminal sialylation of the N-glycan core is sufficient to generate the PSA acceptor site. |
In vitro reconstitution with recombinant PST-1, incompletely glycosylated NCAM variants |
Current biology |
High |
8805371
|
| 1995 |
Molecular cloning of eukaryotic polysialyltransferase-1 (PST-1) and demonstration that expression of this single enzyme is sufficient to induce PSA synthesis on all NCAM-expressing cell lines in reconstitution experiments, establishing that polycondensation of α-2,8-linked sialic acids on NCAM is the result of a single enzymatic activity. |
Expression cloning, transfection, reconstitution in NCAM-expressing cell lines |
Nature |
High |
7854457
|
| 1995 |
Expression cloning of a human polysialyltransferase (ST8SIA2/STX) that forms polysialylated NCAM present in embryonic brain. HeLa cells stably expressing polysialic acid and NCAM promoted neurite outgrowth and sprouting, indicating that polysialylated NCAM is critical for neural plasticity. |
Expression cloning, FACS sorting, stable transfection, neurite outgrowth assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
7624364
|
| 1997 |
NCAM140 selectively co-immunoprecipitates with p59(fyn) from neonatal mouse cerebellum and transfected cells (NCAM180 and NCAM120 do not). NCAM activation (via antibody clustering or soluble NCAM fusion protein) recruits p125(fak) to the NCAM140-p59(fyn) complex and induces rapid transient tyrosine phosphorylation (activation) of both kinases, initiating a signaling cascade linked to growth cone migration. |
Co-immunoprecipitation from brain tissue and transfected cells, tyrosine phosphorylation assays |
The Journal of biological chemistry |
High |
9079653
|
| 1997 |
NCAM-deficient mice show severely impaired fasciculation and pathfinding of hippocampal mossy fiber axons, with alterations in mossy fiber terminal distribution, demonstrating that NCAM is essential for axonal growth, fasciculation, and maintenance of plasticity in the mature nervous system. |
Analysis of NCAM knockout mice (all isoforms), histology, axon tract tracing |
Molecular and cellular neurosciences |
High |
9073395
|
| 1999 |
Clustering of the NCAM140 isoform stimulates activation (dual phosphorylation) of ERK1/2 through a pathway involving p125fak, p59fyn, Ras, and MEK, and also induces phosphorylation of CREB at Ser133. Inhibition of the MAPK pathway selectively reduces NCAM-stimulated neurite outgrowth in cerebellar neurons. |
NCAM antibody clustering, kinase phosphorylation assays, specific pathway inhibitors, cerebellar neuron culture neurite outgrowth assay |
Journal of neurobiology |
High |
10084688
|
| 2000 |
Crystal structure (1.85 Å) of the two N-terminal extracellular Ig-like domains of NCAM reveals a cross-shaped antiparallel dimer in molecular packing, providing the structural basis for homophilic trans-cellular recognition: NCAM forms cis-dimers that mediate low-affinity trans-interactions between cells in zipper-like arrays. |
X-ray crystallography |
Nature structural biology |
High |
10802736
|
| 2002 |
NCAM functions as a signaling receptor for GDNF family ligands independent of RET. NCAM associates with GFRα1 (GPI-anchored GDNF receptor), enabling high-affinity GDNF binding to p140(NCAM) and rapid activation of cytoplasmic kinases Fyn and FAK in RET-deficient cells. GDNF stimulates Schwann cell migration and hippocampal/cortical axonal growth via NCAM-Fyn activation. |
Co-immunoprecipitation, binding assays, kinase activation assays in RET-null cells, migration assay, neurite outgrowth assay |
Cell |
High |
12837245
|
| 2002 |
Lipid raft association of NCAM140 is required for activation of the non-receptor tyrosine kinase pathway and neurite outgrowth. Mutation of NCAM140 palmitoylation sites or destruction of lipid rafts attenuates activation of FAK and ERK1/2, completely blocking neurite outgrowth. Cosignaling via both raft-associated kinases and the FGF receptor is essential for neuritogenesis. |
Hippocampal neuron transfection in NCAM-null mice, palmitoylation-site mutagenesis, methyl-β-cyclodextrin raft disruption, FGFR inhibitor, phospho-kinase assays, neurite outgrowth assay |
The Journal of cell biology |
High |
11980923
|
| 2003 |
NCAM (120, 140, 180 isoforms) forms Triton X-100-insoluble complexes with βI spectrin in hippocampal neurons. βI spectrin binds directly to the intracellular domain of NCAM180 (and via lipid rafts to NCAM120). PKCβ2 forms complexes with NCAM140/NCAM180 and spectrin; NCAM activation enhances this complex and redistributes it to lipid rafts via FGFR. Dominant-negative βI spectrin fragment disrupts the complex and inhibits NCAM-induced neurite outgrowth. |
Co-immunoprecipitation, lipid raft fractionation, dominant-negative transfection, FGFR inhibitor, neurite outgrowth assay |
The Journal of cell biology |
High |
12743109
|
| 2003 |
Direct interaction between NCAM fibronectin type III modules 1 and 2 and FGFR1 Ig modules 2 and 3 demonstrated by surface plasmon resonance. NMR structure of NCAM F3 module 2 shows overlapping binding sites for FGFR1 and ATP; ATP inhibits the NCAM-FGFR interaction and inhibits NCAM-induced neurite outgrowth, revealing ATP as a molecular switch regulating NCAM-FGFR signaling. |
Surface plasmon resonance, NMR structure determination, FGFR phosphorylation assay, neurite outgrowth assay |
Structure |
High |
12791257
|
| 2004 |
NCAM polysialylation increases intermembrane repulsion quantitatively by steric/ionic mechanisms, overwhelming both homophilic NCAM and cadherin-mediated attraction at physiological ionic strength. The repulsion is ionic-strength dependent and PSA-dose dependent, revealing the molecular mechanism by which PSA-NCAM regulates cell adhesion. |
Molecular force measurements (surface force apparatus) on membrane-bound NCAM |
The Journal of biological chemistry |
High |
15504723
|
| 2004 |
NCAM140 directly interacts with the intracellular domain of RPTPα, a known activator of p59fyn. NCAM activation promotes Ca2+-dependent spectrin-mediated crosslinking of NCAM and RPTPα and redistributes the complex to lipid rafts. RPTPα-deficient neurons lose NCAM-p59fyn association and NCAM-mediated p59fyn activation, blocking NCAM-dependent neurite outgrowth. |
Co-immunoprecipitation, RPTPα-knockout neurons, dominant-negative RPTPα, lipid raft fractionation, neurite outgrowth assay |
The Journal of cell biology |
High |
15623578
|
| 2006 |
Metalloprotease-induced ectodomain shedding of NCAM140 releases a 115-kDa soluble fragment. Shedding is induced by the tyrosine phosphatase inhibitor pervanadate via an ADAM metalloprotease regulated by ERK1/2. Metalloprotease inhibitor GM6001 increases NCAM-dependent neurite branching and outgrowth; a transgenic NCAM-shedding mouse model shows impaired neuronal connectivity. |
NCAM transfection in L-fibroblasts, pharmacological inhibitors, metalloprotease inhibitors, transgenic mouse model, neurite outgrowth assay |
Journal of neurobiology |
High |
16967505
|
| 2007 |
ST8SiaIV is the major regulator of NCAM polysialylation in vivo. Analysis of mice lacking ST8SiaII or ST8SiaIV shows that both enzymes polysialylate N-glycosylation sites 5 and 6 of NCAM with the same glycan sets, but ST8SiaII and ST8SiaIV act synergistically to produce long polySia chains at site 5; ST8SiaIV alone yields shorter chains. |
Analysis of polysialyltransferase knockout mice, glycopeptide mass spectrometry, polySia chain-length analysis |
The Journal of biological chemistry |
High |
17986444
|
| 2008 |
NCAM clustering at the cell surface is coupled to Ca2+ influx via T- and L-type voltage-dependent Ca2+ channels associated with NCAM, activation of CaMKIIα, and serine phosphorylation of RPTPα at Ser180 and Ser204, increasing RPTPα phosphatase activity. Mutation of these serine residues interferes with NCAM-induced neurite outgrowth, establishing a novel NCAM→Ca2+ channel→CaMKIIα→RPTPα→neurite outgrowth cascade. |
NCAM clustering assay, Ca2+ channel co-IP, CaMKIIα activation assay, RPTPα serine phosphorylation, dominant-negative/mutant transfection, neurite outgrowth assay |
The Journal of cell biology |
High |
18809727
|
| 2008 |
GAP-43 phosphorylation by PKC or CKII potentiates NCAM-180/spectrin-mediated neurite outgrowth. In the presence of GAP-43, NCAM-180/spectrin/GAP-43 association is required; in its absence, the NCAM-140/Fyn pathway dominates. GAP-43 thus acts as a molecular switch that determines the predominant NCAM signaling mechanism. |
GAP-43 overexpression, phosphorylation mutants, dominant-negative betaI spectrin, neurite outgrowth assay in PC12 and hippocampal neurons |
Journal of neurochemistry |
Medium |
17212696
|
| 2008 |
NCAM-mediated ERK phosphorylation requires FGFR, Src-family kinases, MEK, and Gi/G0-proteins; NCAM-mediated CREB phosphorylation requires Src-family kinases and MEK; NCAM-mediated Akt phosphorylation requires cGMP and PI3K. These pathways are independent of PLC, PKC, PKA, and CaMKII, revealing a specific signaling hierarchy downstream of NCAM. |
NCAM ligand (C3d peptide) stimulation of cerebellar granule neurons, specific pathway inhibitors, phospho-kinase assays |
Neurochemistry international |
Medium |
18656513
|
| 2009 |
Neuronal membrane depolarization triggers skipping of NCAM exon 18, independently of the CaMKIV pathway. This splicing change is regulated by RNA Pol II elongation rate and is accompanied by H3K9 hyper-acetylation restricted to the intragenic region surrounding exon 18, without promoter acetylation changes; effects are reversible and potentiated by HDAC inhibitor TSA. |
Neuronal depolarization, RT-PCR splicing assay, slow Pol II mutant, ChIP for H3K9ac and H3K36me3, HDAC inhibitor |
Proceedings of the National Academy of Sciences of the United States of America |
High |
19251664
|
| 2011 |
NCAM promotes ovarian cancer cell migration and peritoneal metastasis via direct interaction with FGFR. FGFR signaling is required for NCAM-induced cell motility, and a monoclonal antibody targeting the NCAM/FGFR interplay abolishes metastatic dissemination in mice. |
In vitro migration/invasion assays, FGFR inhibition, anti-NCAM monoclonal antibody, mouse peritoneal metastasis model |
EMBO molecular medicine |
High |
21739604
|
| 2013 |
Intragenic repressive chromatin marks (H3K9me2, H3K27me3) increase along the NCAM gene body during neuronal differentiation, correlating with inhibition of Pol II elongation in the exon 18 region and increased exon 18 inclusion. Intronic siRNAs targeting NCAM intron 18 induce H3K9me2 and promote E18 inclusion in undifferentiated cells, confirming that intragenic chromatin deployment is sufficient to alter NCAM alternative splicing. |
ChIP for H3K9me2/H3K27me3, 5-azacytidine and BIX01294 inhibition, intronic siRNA-directed chromatin changes, RT-PCR splicing assay |
The EMBO journal |
High |
23892457
|
| 2013 |
NeuroD1 transcriptionally regulates NCAM expression in neuroendocrine lung carcinomas; impaired NeuroD1 expression mirrors loss of NCAM, and NCAM is a downstream target of NeuroD1 that promotes tumor cell survival and metastasis. |
NeuroD1 knockdown/overexpression, gene expression analysis, cell survival and migration assays |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
23553831
|
| 2017 |
GFRα1 directly interacts with NCAM in embryonic Purkinje cells. Genetic reduction of NCAM expression enhances wild-type Purkinje cell migration and rescues delayed migration in Gfra1 mutants, demonstrating that NCAM restricts Purkinje cell migration and that GFRα1 promotes migration by limiting NCAM function in cis and trans. |
Co-immunoprecipitation, Gfra1/NCAM genetic mutants, in vitro migration assays |
Cell reports |
High |
28076782
|
| 2017 |
TGFβ1 induces NCAM1 expression in cardiomyocytes via a p38-dependent pathway; selective targeting of NCAM1 rescues the cell-cell adhesion defect caused by TGFβ1. NCAM1 protein levels correlate with TGFβ1 activity in human cardiomyopathy samples. |
Cardiac-specific TGFβ1 transgenic mice, electron microscopy, p38 inhibition, NCAM1 siRNA, immunostaining |
Journal of molecular and cellular cardiology |
Medium |
28870505
|
| 2018 |
Peripheral nerve injury activates the anterior cingulate cortex (ACC) and increases turnover of NCAM1 at synapses. NCAM1 mediates dendritic spine reorganization in the ACC and contributes to behavioral sensitization after nerve injury through a mechanism parallel to NMDA-receptor- and protein-synthesis-dependent LTP. |
Peripheral nerve injury model, synaptic protein turnover analysis, spine morphology, behavioral assays |
Cell reports |
Medium |
29346771
|
| 2019 |
NCAM1 regulates AML cell survival and stress resistance. Loss of NCAM1 induces cell death or differentiation and sensitizes blasts to genotoxic agents. NCAM1 expression is associated with constitutive activation of the MAPK pathway; MEK1/2 inhibition specifically sensitizes NCAM1+ AML cells to chemotherapy. Depletion of Ncam1 in a murine leukemia model reduced leukemia-initiating cells and prolonged disease latency. |
Genetic knockdown/knockout (NCAM1), phosphoproteomics, transcriptomics, in vitro cytotoxicity assays, murine transplantation model |
Blood |
High |
30814062
|
| 2020 |
NCAM1 functions as a receptor for Zika virus (ZIKV) entry. Chemical proteomic photocrosslinking identified NCAM1 as a ZIKV-interacting protein; overexpression of NCAM1 enhanced ZIKV infection while knockout and inhibition reduced it in Vero and U-251 MG cells. |
Chemical proteomics (photocrosslinking + biotin enrichment + MS), NCAM1 overexpression, knockout, and inhibition, infection assays |
Nature communications |
High |
32753727
|
| 2020 |
CD56 (NCAM1) deletion in NK92 cells impairs cytotoxic function, lytic granule exocytosis, and immunological synapse polarization. Phosphorylation of the FAK family member Pyk2 at Tyr402 is decreased in CD56-KO cells; reintroduction of CD56 rescues cytotoxicity, exocytosis, and Pyk2 phosphorylation, establishing a functional link between NCAM1 and Pyk2 signaling in NK cell cytotoxicity. |
CRISPR-Cas9 knockout of CD56 in NK92, lytic granule exocytosis assay, immunological synapse assay, phospho-Pyk2 immunoblot, CD56 rescue transfection |
eLife |
High |
32510326
|
| 2022 |
Anti-NCAM1 autoantibodies from schizophrenia patients disrupt NCAM1-NCAM1 homophilic binding, NCAM1-GDNF, and NCAM1-Fyn interactions. Intracerebrospinal introduction into mice inhibits FAK, MEK1, and ERK1 phosphorylation, reduces spine and synapse number in frontal cortex, and induces schizophrenia-related behavior (deficient pre-pulse inhibition, cognitive impairment). |
Cell-based autoantibody assay, ELISA, in vitro interaction blocking assays, intrathecal antibody injection in mice, immunofluorescence (spine/synapse density), behavioral assays |
Cell reports. Medicine |
High |
35492247
|
| 2023 |
KLK8 (a serine protease) proteolytically cleaves the extracellular domain of NCAM1 in hippocampal neurons, decreasing NCAM1 surface expression. Transgenic KLK8 overexpression exacerbates CUMS-induced hippocampal neuronal apoptosis and depression-like behavior; KLK8 deficiency prevents NCAM1 loss. Both NCAM1 overexpression and an NCAM1 mimetic peptide rescue KLK8-overexpressing neurons from apoptosis. |
KLK8 transgenic and KO mice, CUMS model, adenoviral NCAM1 overexpression, co-immunoprecipitation, protease cleavage assay, NCAM1 mimetic peptide rescue, immunofluorescence |
Cell death & disease |
High |
37076499
|
| 2000 |
PSA-NCAM directly interacts with BDNF. Enzymatic removal of PSA (Endo-N) or NCAM knockout reduces LTP in hippocampal CA1 and reduces TrkB phosphorylation. Exogenous BDNF restores deficient LTP in both NCAM-KO and Endo-N-treated slices, suggesting that PSA-NCAM sensitizes pyramidal neurons to BDNF to modulate activity-dependent synaptic plasticity. |
NCAM knockout mice, Endo-N enzymatic PSA removal, organotypic hippocampal slice LTP recordings, BDNF rescue, TrkB phosphorylation assay, PSA-NCAM binding to BDNF |
Proceedings of the National Academy of Sciences of the United States of America |
High |
10760298
|