| 2011 |
CBLN2 (like CBLN1) specifically binds to α and β isoforms of neurexin carrying the splice site 4 insert [NRXs(S4+)] and induces synaptogenesis in cerebellar, hippocampal, and cortical neurons in vitro. CBLN1 and CBLN2 compete with neuroligin 1-mediated synaptogenesis by sharing presynaptic receptor NRXs(S4+). The CBLN2–NRX interaction is insensitive to extracellular Ca2+ concentrations. |
In vitro synaptogenesis assay, binding competition assay, Ca2+-sensitivity assay |
The European journal of neuroscience |
High |
21410790
|
| 2011 |
CBLN2 binds to the N-terminal domain of GluRδ1 and induces preferentially inhibitory presynaptic differentiation of cultured cortical neurons when added together with GluRδ1-expressing HEK293T cells. The synaptogenic activity of CBLN2 is suppressed by soluble extracellular domain of NRXN1α or NRXN1β(S4), indicating CBLN2 bridges GluRδ1 postsynaptically and NRXNs presynaptically. |
Co-culture synaptogenesis assay, direct binding assay (pulldown), HEK293T cell transfection |
Journal of neurochemistry |
High |
21356198 22191730
|
| 2011 |
CBLN1 and CBLN2 show robust binding to NRXN1α and all three β-NRXNs, selective for variants containing splice segment 4 (S4). CBLN2 has lower binding affinity to NRXNs than CBLN1 as measured by surface plasmon resonance. CBLN4 shows much weaker interaction with NRXNs. CBLN2 induces presynaptic differentiation of cortical neurons, with preferentially inhibitory over excitatory presynaptic differentiation compared to neuroligin 1. |
Surface plasmon resonance binding assay, in vitro synaptogenesis assay with cultured cortical neurons |
Biochemical and biophysical research communications |
High |
21356198
|
| 2007 |
CBLN2 is secreted as an N-linked glycoprotein from mammalian heterologous cells. CBLN2 forms not only homomeric but also heteromeric complexes with other Cbln family members (including CBLN1, CBLN3, CBLN4) in vitro. Heteromer formation can modulate secretion and trafficking of family members. |
Transfection of heterologous cells, Western blot, immunoprecipitation, secretion assay |
The European journal of neuroscience |
High |
17331201
|
| 2012 |
CBLN1 and CBLN2 both bind to GluRδ2 and NRXN1-3; ectopic expression of CBLN2 in Purkinje cells of Cbln1-null mice rescues cerebellar synaptic deficits, demonstrating functional redundancy with CBLN1 in the cerebellum mediated through shared receptor binding. However, Cbln2-null mice do not display the striatal synaptic alterations seen in Cbln1-null mice, indicating non-redundant roles in thalamic neurons. |
Transgenic rescue (ectopic Cbln2 expression in Purkinje cells of Cbln1-null mice), Cbln2 knockout mouse generation, binding assays, synaptic morphology analysis |
Journal of neurochemistry |
High |
22117778
|
| 2012 |
CBLN4, but not CBLN1 or CBLN2, selectively binds the netrin receptor DCC in a netrin-displaceable fashion. CBLN1 and CBLN2 both bind GluRδ2 and neurexins 1–3, whereas CBLN4 binds weakly or not at all. Heteromeric complexes of CBLN1+CBLN4 have greatly reduced affinity for DCC but increased affinity for neurexins. |
Candidate receptor-screening binding assay, netrin displacement assay, co-immunoprecipitation |
Journal of neurochemistry |
Medium |
22220752
|
| 2018 |
GluD1 (δ1 glutamate receptor) requires CBLN2 to assemble and maintain excitatory synapses in the hippocampus. The action of GluD1 is absent in Cbln2 knockout mice. GluD1 actions further require presynaptic neurexin 1β carrying the splice site 4 insert (+S4). Together, CBLN2 forms a tripartite complex linking presynaptic neurexin 1β(+S4) to postsynaptic GluD1 for hippocampal synapse assembly and maintenance. |
Cbln2 knockout mice, electrophysiology, synapse density analysis, genetic epistasis with neurexin splice variants |
Proceedings of the National Academy of Sciences of the United States of America |
High |
29784783
|
| 2018 |
Cbln1/2 double-KO (but not single KO) mice exhibit salience-induced seizures, and a selective ~50% decrease in hippocampal excitatory synapse density in the stratum lacunosum moleculare and dentate gyrus of aging (6-month-old) mice, as well as decreased synapse density in striatum and retrosplenial cortex. Cerebellins do not contribute to initial synapse formation but are required for long-term synapse maintenance. |
Constitutive single, double, and triple KO mice; synapse density quantification; behavioral testing (seizure assessment, motor behavior) |
The Journal of neuroscience |
High |
29691328
|
| 2021 |
Constitutive Cbln2 KO mice display robust compulsive behaviors (stereotypic pattern running, marble burying, explosive jumping, excessive nest building) and decreased brain serotonin levels. Conditional deletion of Cbln2 from dorsal raphe neurons or from presynaptic neurons synapsing onto dorsal raphe neurons reproduces compulsive behaviors. Injection of recombinant CBLN2 protein into the dorsal raphe of Cbln2 KO mice largely reverses compulsive behaviors. Serotonin precursor 5-HTP or fluoxetine alleviated compulsive behaviors in Cbln2 KO mice. |
Constitutive and conditional KO mice, behavioral assays, HPLC serotonin measurement, recombinant protein injection rescue, pharmacological rescue |
Molecular psychiatry |
High |
34158618
|
| 2022 |
At CA1→subiculum synapses, Nrxn1SS4+ and Nrxn3SS4+ act through secreted CBLN2 to activate postsynaptic GluD1: Nrxn1SS4+–CBLN2 signaling enhances NMDA-receptor responses, while Nrxn3SS4+–CBLN2 signaling suppresses AMPA-receptor responses, without affecting synapse formation or number. In the prefrontal cortex, Nrxn1SS4+–CBLN2 signaling selectively controls NMDA-receptors without affecting spine or synapse numbers. Constitutive Cbln2 deletion confirms these functions with no additional developmental synaptogenic role. |
Constitutive Cbln2 deletion in mice, electrophysiology (AMPA/NMDA receptor recordings), spine/synapse density quantification in multiple brain regions |
eLife |
High |
36205393
|
| 2021 |
Species differences in CBLN2 expression level and laminar distribution in the prefrontal cortex are, at least in part, due to Hominini-specific deletions containing SOX5-binding sites within a retinoic acid-responsive CBLN2 enhancer. In situ genetic humanization of the mouse Cbln2 enhancer drives increased and ectopic laminar Cbln2 expression and promotes prefrontal cortex dendritic spine formation. |
Comparative transcriptomics, enhancer analysis, ChIP for SOX5-binding sites, in situ genetic humanization of mouse Cbln2 enhancer, dendritic spine quantification |
Nature |
High |
34599306
|
| 2024 |
A GRID1 variant in the distal amino-terminal domain at a position predicted to interact with CBLN2/CBLN4 disrupts complex formation between GluD1 and CBLN2, as demonstrated by biochemical assay, potentially perturbing synapse organization. |
Site-directed mutagenesis of GluD1 variant, biochemical co-complex assay |
Human molecular genetics |
Medium |
37944084
|
| 2023 |
CBLN2 promotes endothelial-mesenchymal transition (EndMT) in hypoxic pulmonary hypertension by activating the NF-κB/HIF-1α/Twist1 pathway. CBLN2 siRNA, NF-κB inhibitor PDTC, and HIF-1α inhibitor KC7F2 each inhibit hypoxia-induced EndMT in HPAECs. |
Hypoxia-induced PH rat model, EndMT cell model, siRNA knockdown, pathway inhibitors, Western blot, immunofluorescence |
Life sciences |
Medium |
37355224
|
| 2023 |
Retinoic acid (RA) supplementation increases RARα expression and enhances RARα binding to CBLN2 promoters (confirmed by ChIP assay), upregulating CBLN2 expression in the cerebellum of VPA-treated autistic rats and ameliorating motor coordination deficits. This establishes a RARα→CBLN2 transcriptional regulatory axis. |
VPA rat autism model, RA supplementation, ChIP assay for RARα at Cbln2 promoter, qPCR, behavioral motor assays |
Neuroscience letters |
Medium |
37247722
|
| 2025 |
SOX11 binds to 12 cis-regulatory elements within the Cbln2 promoter to enhance its transcription following spinal nerve ligation (SNL). CBLN2 expression is persistently upregulated in dorsal root ganglia after SNL. siRNA knockdown of Sox11 or Cbln2 attenuates SNL-induced mechanical allodynia and thermal hyperalgesia. Exogenous CBLN2 activates NF-κB signaling and induces neuronal hyperexcitability; inhibition of NF-κB reduces CBLN2-induced pain hypersensitivity and proinflammatory cytokine production. |
ChIP assay (SOX11 at Cbln2 promoter), siRNA knockdown in vivo, intrathecal CBLN2 injection, high-throughput sequencing, NF-κB inhibitor pharmacology, behavioral pain assays |
Neuroscience bulletin |
Medium |
41162740
|
| 2025 |
TET3-mediated demethylation of the Cbln2 promoter drives CBLN2 upregulation in the trigeminal ganglion following partial infraorbital nerve transection (pIONT). Tet3 knockdown alleviates neuropathic pain and downregulates Cbln2. Exogenous CBLN2 potentiates neuronal excitability and activates ERK signaling; inhibition of the MEK/ERK pathway abolishes CBLN2-induced hypersensitivity and suppresses proinflammatory cytokine expression. |
Methylation-specific PCR, bisulfite sequencing PCR, siRNA knockdown in vivo, whole-cell patch-clamp, ERK pathway inhibitors, behavioral pain assays |
The journal of headache and pain |
Medium |
40665237
|
| 2018 |
CBLN2-derived peptides (3 novel peptides identified by mass spectrometry from dorsal horn spinal cord) induce mechanical hypersensitivity upon intrathecal injection in mice. Two of three CBLN2-derived peptides significantly increased pain responses in the first 6 hours post-injection compared to saline controls. |
Mass spectrometry peptide identification from spinal cord, intrathecal injection, von Frey mechanical sensitivity testing |
Neuropeptides |
Medium |
29705514
|
| 2024 |
CBLN2 overexpression inhibits STAT3-induced PD-L1 and beta-catenin activation in colorectal cancer cells and inhibits oncogenic properties in vitro and tumor growth in vivo. CBLN2 overexpression improves immune checkpoint blockade efficacy in the MC38 CRC model. |
Overexpression in CRC cell lines, in vivo tumor growth assay, Western blot for STAT3/PD-L1/beta-catenin, MC38 syngeneic tumor model with ICB treatment |
International immunopharmacology |
Medium |
39577217
|
| 1994 |
CBLN2 was cloned as a distinct gene from CBLN1; amino acid comparison revealed CBLN2 is 88% identical to the carboxy-terminal region of CBLN1. Southern analysis confirmed they are independent genes. Cbln2 maps to the distal end of mouse chromosome 18. |
Molecular cloning, sequence alignment, Southern blot, genetic mapping |
Brain research. Molecular brain research |
High |
7877445
|