| 2021 |
Cryo-EM structure of the Sema3A/PlexinA4/Neuropilin-1 extracellular complex at 3.7 Å resolution reveals a symmetric 2:2:2 assembly in which each subunit makes multiple interactions with others. The two PlexinA4 molecules do not interact directly but their membrane-proximal regions are poised to promote intracellular active dimer formation. A previously unknown interface between the a2b1b2 module of Nrp1 and the Sema domain of Sema3A was identified, placing the a2b1b2 module at the top of the complex far from the membrane. |
Cryo-EM structure determination of near-intact extracellular complex |
Nature communications |
High |
34039996
|
| 2005 |
FARP2, a FERM domain-containing guanine nucleotide exchange factor (GEF), associates directly with plexin-A1 in the presence of neuropilin-1. Upon Sema3A binding to neuropilin-1, FARP2 dissociates from plexin-A1, activating FARP2's Rac GEF activity and recruiting Rnd1 to plexin-A1, which downregulates R-Ras. Simultaneously, the FERM domain of FARP2 sequesters PIPKIgamma661 from talin, inhibiting its kinase activity. These activities are required for Sema3A-mediated axon repulsion and suppression of neuronal adhesion. |
Co-immunoprecipitation, direct binding assays, Rac GEF activity assays, neuron culture repulsion assays |
Nature neuroscience |
High |
16286926
|
| 2000 |
L1 CAM forms a stable complex with neuropilin-1 (NP-1) through direct association of their extracellular domains, making L1 a component of the Sema3A receptor complex. L1-deficient cortical axons fail to respond to Sema3A repulsion in coculture assays. Addition of soluble L1Fc chimeric molecules converts wild-type axon repulsion by Sema3A into attraction, demonstrating L1 functions within the Sema3A transducing pathway in the growth cone. |
Coculture repulsion assay, co-immunoprecipitation of L1 and NP-1, soluble L1Fc rescue experiment |
Neuron |
High |
10985345
|
| 2006 |
PTEN is required for Sema3A-mediated growth cone collapse in sensory neurons. Sema3A suppresses PI3K signaling concomitant with GSK-3 activation in a PTEN-phosphatase-activity-dependent manner. Following Sema3A exposure, PTEN rapidly accumulates at the growth cone membrane, providing a mechanism by which PTEN couples Sema3A signaling to growth cone collapse. |
Live imaging of PTEN localization, pharmacological PI3K/GSK-3 manipulation, PTEN phosphatase mutant analysis in sensory neuron collapse assay |
Journal of cell science |
Medium |
16495486
|
| 1999 |
Sema3A-induced growth cone collapse is mediated through Rac1 amino acids 17-32. Cell-permeable peptides spanning this region bind Rac1-interacting molecules PAK, WASP, 3BP-1, and p85beta-PI3K and inhibit Sema3A-induced growth cone collapse. A PAK CRIB-motif peptide also inhibits collapse in a Rac1-binding-dependent manner, implicating downstream Rac1-PAK signaling in the collapse response. |
Cell-permeable peptide competition assays, direct binding assays, growth cone collapse assay |
Current biology |
Medium |
10508610
|
| 2014 |
CRMP1 interacts with both the actin-binding domain and the last immunoglobulin-like repeat of Filamin-A. This interaction participates in Sema3A-induced axon repulsion in neurons; alanine mutations in the interacting residues of Filamin-A or CRMP1 suppress Sema3A repulsion. A phosphomimetic CRMP1(Ser522Asp) mutant enhances Sema3A response and, by atomic force microscopy, causes Filamin-A to adopt a condensed form and weakens F-actin gelation crosslinked by Filamin-A. |
Co-immunoprecipitation, yeast two-hybrid, alanine mutagenesis in neuron repulsion assay, atomic force microscopy, F-actin gelation assay |
Nature communications |
High |
25358863
|
| 2014 |
ADAM10 and ADAM17 metalloprotease-mediated cleavage of neuropilin-1 (Nrp1) promotes developmental downregulation of Sema3A responsiveness in murine sensory axons. Genetic ablation of ADAM10 and ADAM17 disrupts Nrp1 downregulation in sensory axons and correlates with gain of repulsive response to Sema3A. Overexpression of Nrp1 with high susceptibility to cleavage reverses axonal desensitization, and ADAM knockouts show guidance errors consistent with enhanced Sema3A response. |
Genetic knockout of ADAM10/17, Nrp1 overexpression with cleavage-susceptibility mutant, DRG axon guidance assay |
Nature communications |
High |
24898499
|
| 2014 |
Sema3A signaling for axon repulsion requires the plexin-A1 and plexin-A4 receptors (in combination with neuropilin-1) but not plexin-A2. Silencing plexin-A2 in endothelial and glioblastoma cells does not affect Sema3A signaling. Overexpression of plexin-A2 can rescue Sema3A signaling in plexin-A1- or plexin-A4-silenced cells, indicating functional redundancy at high expression levels. |
siRNA silencing of specific plexins in endothelial and glioblastoma cells, functional migration/signaling assays |
Journal of cell science |
Medium |
25335892
|
| 2010 |
A Sema3A(K108N) loss-of-function allele identified by forward genetic screen phenocopies Sema3A-null mice. The K108N mutation does not impair Sema3A expression, secretion, or binding to neuropilin-1 (Npn-1), but the protein fails to repel or collapse DRG axons in vitro. In silico modeling and mutagenesis predict that K108N disrupts interaction with the Npn-1/PlexA holoreceptor complex, interfering with signaling at the growth cone. |
Forward genetic screen in mice, in vitro DRG collapse/repulsion assay, binding assay to Npn-1, in silico structural modeling and mutagenesis |
The Journal of neuroscience |
Medium |
20410128
|
| 2013 |
Hypoxia-induced Sema3A acts as a chemoattractant for tumor-associated macrophages (TAMs) by triggering VEGFR1 phosphorylation through the Nrp1/PlexinA1/PlexinA4 holoreceptor complex. In hypoxic conditions where Nrp1 is downregulated, Sema3A continues to regulate TAMs in an Nrp1-independent manner by eliciting PlexinA1/PlexinA4-mediated stop signals that retain TAMs inside the hypoxic niche. Gene deletion of Nrp1 in macrophages favors TAM entrapment in normoxic tumor regions. |
VEGFR1 phosphorylation assay, macrophage-specific Nrp1 gene deletion, in vivo tumor models |
Cancer cell |
High |
24332039
|
| 2013 |
Neuron-derived (not osteoblast-derived) Sema3A regulates bone mass by modulating sensory nerve innervation of trabecular bone. Neuron-specific Sema3A knockout mice (Sema3asynapsin-/- and Sema3anestin-/-) have reduced trabecular sensory innervation and low bone mass, while osteoblast-specific knockouts (Sema3acol1-/- and Sema3aosx-/-) have normal bone mass. Ablating sensory nerves decreased bone mass in wild-type mice but not in Sema3anestin-/- mice, supporting an essential role of sensory innervation in bone homeostasis mediated by neuronal Sema3A. |
Cell-type-specific conditional knockout mice, sensory/sympathetic nerve density quantification, nerve ablation experiments, cell-based osteoblast differentiation assays |
Nature |
High |
23644455
|
| 2019 |
Estrogen induces osteocyte expression of Sema3A, which acts on its own receptor (including Nrp1) on osteocytes in an autocrine/paracrine manner to promote osteocyte survival and maintain bone homeostasis via soluble guanylate cyclase-cGMP signaling. Osteocyte-specific deficiency of either Sema3A or Nrp1 recapitulates severe osteoporosis with fewer osteocytes. |
Conditional osteocyte-specific knockout of Sema3A and Nrp1, pharmacological sGC-cGMP agonist rescue, ovariectomy model |
Cell metabolism |
High |
30661929
|
| 2007 |
Sema3A expressed in Purkinje fibers establishes a cardiac sympathetic innervation gradient from epicardium to endocardium. Sema3A-null mice lack this gradient and exhibit sinus bradycardia due to sympathetic dysfunction. Cardiac-specific Sema3A overexpression reduces sympathetic innervation and causes sudden death and ventricular tachycardia due to catecholamine supersensitivity and prolonged action potential duration. |
Sema3A knockout and cardiac-specific transgenic overexpression in mice, electrophysiological measurements, innervation density quantification |
Nature medicine |
High |
17417650
|
| 2002 |
Neuropilin-1-mediated Sema3A signaling is required for proper patterning of the sympathetic nervous system. Neuropilin-1 and Sema3A mutant mice show displacement of sympathetic neurons and abnormal sympathetic trunk morphogenesis. Sema3A suppresses migration of sympathetic neurons from wild-type but not neuropilin-1 mutant embryos in vitro, and promotes their aggregation into compact cell masses and neurite fasciculation. |
Targeted gene disruption of neuropilin-1 and Sema3A, in vitro sympathetic neuron migration assay with receptor mutants |
Development |
High |
11830568
|
| 2017 |
PTPδ mediates Sema3A-induced cortical basal dendritic arborization through activation of Fyn kinase by dephosphorylating its C-terminal Tyr527. In Ptpδ-/- brains, Fyn and Src are hyperphosphorylated at Tyr527. Sema3A stimulation induces Tyr527 dephosphorylation in wild-type but not Ptpδ-/- dendrites. Double heterozygous Ptpδ+/-; Sema3a+/- mice show reduced basal dendrite arborization, demonstrating genetic interaction. PTP-3 (C. elegans LAR homolog) participates in Sema2A-regulated axon guidance, supporting cross-species conservation. |
Ptpδ knockout mice, phosphorylation assays of Fyn/Src, double-heterozygous genetic interaction test, Sema3A stimulation of cultured neurons, C. elegans genetic assays |
The Journal of neuroscience |
High |
28637841
|
| 2013 |
SEMA3A expressed locally by Purkinje cells regulates cerebellar basket cell axon branching through Neuropilin-1 (NRP1). SEMA3A-induced axon branching depends on local recruitment of soluble guanylyl cyclase (sGC) to the plasma membrane of basket cells, regulated by the Src kinase FYN. In fyn-/- mice, basket axon terminal branching is reduced specifically in the Purkinje cell layer. |
Sema3A and Nrp1 knockout mice, sGC localization assay, fyn knockout mice, basket axon branching quantification |
Current biology |
High |
23602477
|
| 2009 |
The stimulation of dendrite growth by Sema3A requires integrin engagement and focal adhesion kinase (FAK). Sema3A promotes hippocampal dendrite extension via a pathway requiring FAK phosphorylation; this effect depends on integrin engagement. Conditional inactivation of beta1 integrin or FAK blocks Sema3A-stimulated dendrite growth but not collapse of axonal growth cones, demonstrating that distinct pathways mediate the opposing responses to Sema3A in axons versus dendrites. |
Conditional knockout of beta1 integrin and FAK in hippocampal neurons, FAK phosphorylation assay, dendrite growth and growth cone collapse assays |
Journal of cell science |
High |
19454481
|
| 2010 |
FAK functions downstream of Sema3A in hippocampal neurons. Sema3A elicits divergent effects on FAK tyrosine phosphorylation: it increases phosphorylation of Tyr397, the kinase domain, and Tyr925, while decreasing phosphorylation of Tyr407 and Tyr861. FAK conditional ablation abolishes Sema3A-induced axon remodeling. FAKY925 phosphorylation decreases FAK-Paxillin interaction and promotes adhesion contact disassembly via alpha-actinin tyrosine phosphorylation. |
FAK conditional knockout in hippocampal neurons, site-specific FAK phosphorylation analysis, co-immunoprecipitation of FAK-Paxillin, adhesion contact assay |
Molecular and cellular neurosciences |
Medium |
20159040
|
| 2014 |
SEMA3A is a naturally occurring inhibitor of Kv4.3 (Ito) potassium channels. SEMA3A selectively reduces Kv4.3 peak current density without altering cell surface expression when co-expressed in HEK293 cells. Co-immunoprecipitation and disruption of a putative toxin-binding domain on Kv4.3 revealed direct binding between SEMA3A and Kv4.3. SEMA3A also reduces Ito current in human iPSC-derived cardiomyocytes. Rare SEMA3A missense mutations in Brugada syndrome patients disrupt Kv4.3 inhibition, causing Kv4.3 gain-of-function. |
Whole-cell patch clamp in HEK293 cells, co-immunoprecipitation, mutational analysis of SEMA3A and Kv4.3 binding domain, iPSC-cardiomyocyte electrophysiology |
Circulation research |
High |
24963029
|
| 2018 |
A rationally designed NRP1-independent SEMA3A point mutant binds PLXNA4 with nanomolar affinity (unlike wild-type SEMA3A which requires NRP1 co-receptor). This mutant shows greater biochemical and biological activity in cultured endothelial cells and normalizes tumor vasculature, inhibits tumor growth, and curbs metastasis in mouse pancreatic cancer models when parenterally administered. |
Rational protein engineering and mutagenesis, in vitro endothelial cell assays, in vivo mouse pancreatic cancer xenograft model, retinal neovascularization model |
Science translational medicine |
High |
29794061
|
| 2006 |
Sema3A inhibits axonal regeneration after spinal cord injury in adult rats. A selective Sema3A inhibitor (SM-216289) administered to the spinal cord lesion site enhanced axon regeneration/preservation, promoted Schwann cell-mediated myelination, decreased apoptotic cell number, and enhanced angiogenesis, resulting in improved functional recovery. |
Spinal cord transection model in adult rats, pharmacological inhibition with SM-216289, histological and functional assessments |
Nature medicine |
Medium |
17099709
|
| 2000 |
Sema3A inhibits branching morphogenesis of fetal mouse lung via neuropilin-1 (NP-1) as receptor or receptor component. Exogenous Sema3A reduces terminal bud number in fetal lung explants in a dose-dependent manner without affecting DNA synthesis. A soluble NP-1 ectodomain neutralizes the inhibitory effect, and fetal lungs from neuropilin-1 null mice are resistant to Sema3A treatment. |
Fetal lung explant culture, exogenous Sema3A treatment, soluble NP-1 neutralization, neuropilin-1 null mouse lung culture |
Mechanisms of development |
Medium |
11025205
|
| 2007 |
Sema3A expressed in the distal hindgut mesenchyme regulates entry of sacral enteric neural crest-derived cells (ENPs) into the hindgut via neuropilin-1 expressed on migrating ENPs. In Sema3A-null fetal mice, sacral ENPs and extrinsic axons enter the distal hindgut prematurely. ENPs did not express neuropilin-2, and no change in ENP colonization timetable was detected in neuropilin-2-null mice. |
Co-culture assays of gut explants with COS cell clusters expressing Sema3A, Sema3A null mouse analysis, neuropilin-1 receptor expression analysis on ENPs |
Developmental biology |
Medium |
17362911
|
| 2016 |
Sema3A interacts with its C-terminal basic region with glycosaminoglycans (GAGs) including heparin and chondroitin sulfate A, and this interaction is biologically relevant to Sema3A signaling. C-terminus-derived basic peptides bind GAGs with low-micromolar affinity. The peptoid inhibitor SICHI blocks Sema3A chemorepulsion by competing with Sema3A C-terminus peptides for GAG binding rather than by blocking direct Sema3A-Nrp1 protein-protein interaction. |
NMR, surface plasmon resonance, isothermal titration calorimetry, fluorescence spectroscopy, competition binding assays |
Biophysical journal |
High |
27028639
|
| 2004 |
Sema3A and VEGF164 both signal through neuropilin-1 (Nrp1) but regulate distinct compartments of facial nerve neurons: Sema3A controls axon guidance of facial nerve neurons but is not required for somatic migration, whereas VEGF164 is essential for somatic migration but not axon guidance. These observations demonstrate that structurally distinct ligands sharing a receptor can pattern different compartments of the same cell. |
Genetically engineered mouse mutants (Sema3A knockout, VEGF164 mutant), analysis of facial nerve axon vs. soma behavior in vivo |
Genes & development |
High |
15545635
|
| 2009 |
ERM proteins (ezrin, radixin, moesin) are required for Sema3A-mediated growth cone collapse and guidance in neocortical neurons. Active ERMs concentrate asymmetrically in growth cones and are rapidly and transiently inactivated by Sema3A. The FERM domain of active ERMs regulates internalization of the Sema3A receptor Npn1 and its co-receptor L1CAM, while the ERM C-terminal domain binds and caps F-actin. |
Live imaging of ERM localization, ERM loss-of-function experiments, receptor internalization assay, growth cone collapse and guidance assay |
The Journal of comparative neurology |
Medium |
18651636
|
| 2007 |
CHL1, a transmembrane cell adhesion molecule, recruits ezrin (an ERM family F-actin binding protein) to the plasma membrane via a membrane-proximal RGGKYSV motif in its cytoplasmic domain. This CHL1/ERM interaction is required for Sema3A-induced growth cone collapse and CHL1-dependent neurite outgrowth and branching in cortical neurons. |
Cytofluorescence recruitment assay, CHL1 cytoplasmic domain mutagenesis, growth cone collapse assay, neurite outgrowth assay |
Journal of neurochemistry |
Medium |
17995939
|
| 2013 |
Sema3A maintains corneal avascularity by inhibiting VEGF-induced angioblast migration. Sema3A is expressed at higher levels than VEGF in the lens adjacent to the presumptive cornea. Blockade of Sema3A signaling (lens removal or synthetic inhibitor injection) causes ectopic angioblast migration and corneal vascularization. Exogenous Sema3A protein inhibits VEGF-induced vascularization. Loss of Sema/Nrp1 signaling in Nrp1(Sema-) mutant mice results in ectopic angioblasts and corneal vascularization. |
Lens removal surgery, synthetic Sema3A inhibitor injection, exogenous Sema3A bead implantation, Nrp1(Sema-) mutant mouse analysis |
Developmental biology |
High |
24809797
|
| 2019 |
Sema3a-Nrp1 signaling mediates the fiber-type specificity of Twist2+ (Tw2+) muscle progenitor cells. Nrp1 is expressed by Tw2+ progenitors but not Pax7+ satellite cells, and Sema3a is expressed by type I and IIa myofibers but not IIb myofibers. Sema3a-Nrp1 signaling repels Tw2+ cells from type I/IIa fibers, directing their fusion specifically with IIb fibers. Sema3a transgenic overexpression confirms this mechanism in vivo. |
Stripe migration assay, chimeric cell-cell fusion assay, Sema3a transgenic mouse model, RNA sequencing and immunofluorescence |
Developmental cell |
High |
31474563
|
| 2013 |
In statoacoustic ganglion (SAG) neurons, Sema3a expressed in the dorsal otocyst acts as a repellent through a receptor complex involving Nrp1 and either PlexinA1 or PlexinA3. PlexinA1/PlexinA3 double mutant mice and Sema3a mutant mice show similar defects in SAG afferent projections (abnormal dorsal extension beyond normal vestibular target areas), establishing the ligand-receptor complex responsible. |
Sema3a null mouse, plexinA1/plexinA3 double knockout mouse, afferent projection analysis in inner ear |
PLoS one |
Medium |
23991118
|
| 2009 |
Sema3A acts as a chemoattractive signal for hippocampal apical dendrites (while repelling axons). In dissociated hippocampal neurons, Sema3A promotes dendrite extension through FAK phosphorylation requiring integrin engagement. This is distinguishable from axonal growth cone collapse induced by the same molecule. |
Hippocampal neuron culture, dendrite growth assay, FAK phosphorylation assay, conditional integrin/FAK knockout |
Journal of cell science |
Medium |
19454481
|
| 2009 |
Sema3A increases its own expression in satellite cells in response to HGF treatment during early myogenic differentiation. FGF2 similarly upregulates Sema3A expression, while TGF-β2 and TGF-β3 potently suppress basal Sema3A expression and cancel the upregulatory effects of HGF and FGF2. Neutralizing antibody to c-met does not abolish HGF-induced Sema3A upregulation, suggesting an alternative receptor mediates this effect. |
Primary satellite cell cultures, RT-PCR and immunochemistry for Sema3A, growth factor dose-response assays, c-met neutralizing antibody |
American journal of physiology. Cell physiology |
Medium |
19515904
|
| 2006 |
In multiple myeloma endothelial cells (MMECs), loss of SEMA3A autocrine signaling tilts the VEGF165/SEMA3A balance toward VEGF165. Exogenous VEGF165 induces SEMA3A expression in normal endothelial cells but not in MMECs. Exogenous SEMA3A counteracts VEGF165 activity in MMECs as efficiently as anti-VEGFR-2 antibody, with both VEGF165 and SEMA3A competing for NRP1, VEGFR-2, and plexin-A1 receptors. |
Endothelial cell angiogenesis assays, VEGF165/SEMA3A expression analysis, exogenous SEMA3A treatment, anti-VEGFR-2 comparison |
Blood |
Medium |
16684957
|
| 2017 |
SEMA3A inhibits phosphorylation of VEGFR2 and its downstream effectors Src and FAK in oral cancer cells, providing a mechanistic basis for its anti-angiogenic activity. Overexpression of SEMA3A in tongue squamous cell carcinoma cells significantly inhibited endothelial tube formation and reduced angiogenesis in CAM assay and mouse xenograft. |
Western blot for VEGFR2/Src/FAK phosphorylation, endothelial tube formation assay, CAM assay, tumor xenograft model |
BMC pharmacology & toxicology |
Medium |
28683823
|
| 2024 |
Sema3A secreted by sensory neurons prevents overstretching of F-actin induced by mechanical overload through ROCK2 pathway, maintaining mitochondrial fusion dynamics. In vitro mechanical loads upregulate Sema3A in neurons but not in periodontal ligament cells. Exogenous Sema3A restores osteogenic differentiation of hPDLCs suppressed by mechanical overload. |
In vitro mechanical loading of neurons and hPDLCs, Sema3A exogenous treatment, ROCK2 pathway inhibitor, F-actin and mitochondrial dynamics assays |
International journal of oral science |
Medium |
38238300
|
| 2019 |
Sema3A inhibits axonal regeneration of retinal ganglion cells via ROCK2. Sema3A promotes phosphorylation of myosin light chain 2 (MLC2), a specific downstream effector of ROCK2. The ROCK2 inhibitor Y-27632 attenuates the inhibitory effect of Sema3A on optic nerve regeneration in vivo. |
Optic nerve crush model, intravitreal injection of Sema3A and Y-27632, MLC2 phosphorylation assay, axon regeneration markers (GAP43, Sprr1A), F-VEPs |
Brain research |
Medium |
31733191
|
| 2017 |
Sema3A promotes M2 macrophage polarization and inhibits M1 polarization. In vitro, recombinant Sema3A induces apoptosis of classical M1 macrophages and promotes their polarization toward resolution-phase M2 macrophages with enhanced efferocytotic ability. Sema3A heterozygote mice post-MI show increased leukocyte infiltration and impaired cardiac function compared to wild-type. |
In vitro recombinant Sema3A treatment of bone marrow-derived macrophages, Sema3A heterozygote mouse MI model, flow cytometry for macrophage polarization markers |
Basic research in cardiology |
Medium |
28540528
|
| 2024 |
In PDAC cells, SEMA3A promotes cell migration and anoikis resistance through the canonical SEMA3A-NRP1 axis, associated with increased focal adhesion kinase (FAK) signaling. SEMA3A also functions as a chemoattractant for macrophages and skews their polarization toward an M2-like immunosuppressive phenotype. Macrophage depletion in SEMA3A-high tumors results in greater CD8+ T cell infiltration. |
Gain/loss of function in PDAC cell lines and organoids, FAK signaling assays, macrophage migration and polarization assays, macrophage depletion in vivo |
Gut |
Medium |
38670629
|
| 2020 |
Nestin selectively facilitates phosphorylation of doublecortin (DCX) by cdk5/p35 kinase by acting as a scaffold that bridges DCX and activated cdk5/p35, but does not affect phosphorylation of other cdk5 substrates. This nestin-DCX complex mediates Sema3A sensitivity of developing cortical neuron growth cones; Dcx KO neurons phenocopy the effects of nestin loss on growth cone morphology and Sema3A responsiveness. |
Nestin KO and DCX KO cortical neuron cultures, cdk5 substrate phosphorylation assays, co-immunoprecipitation of nestin-DCX, growth cone collapse assay |
The Journal of neuroscience |
Medium |
32273484
|
| 2019 |
Sema3A drives macrophage polarization toward M2 phenotype in periodontitis via activation of PI3K/AKT/mTOR signaling pathways. In vitro, Sema3A promotes LPS/IFNγ-induced M1 macrophages to convert to M2 macrophages; inhibition of PI3K signaling reduces this anti-inflammatory activity and boosts inflammatory cytokine expression. |
RAW264.7 macrophage polarization assay, PI3K pathway inhibitor experiments, ELISA for cytokines, in vivo mouse periodontitis model |
Inflammation |
Medium |
36598593
|
| 2018 |
CHD7 is enriched at the Sema3a promoter in neural crest cells; loss of CHD7 function inhibits Sema3A expression, placing Sema3A downstream of CHD7 in an epigenetic regulatory loop relevant to CHARGE syndrome pathogenesis. Human SEMA3A rescues CHD7 loss of function in a Xenopus CHARGE model. A pathogenic SEMA3A variant (R66W) reduces protein secretion, while the likely-benign I668V variant does not affect protein secretion or processing. |
ChIP enrichment at Sema3a promoter, Xenopus CHD7 loss-of-function rescue assay, SEMA3A variant expression and secretion analysis in transfected cells |
Human molecular genetics |
Medium |
29432577
|
| 2012 |
Nrp1(sema/sema) mutant mice lacking a functional semaphorin-binding domain in neuropilin-1 display a Kallmann syndrome-like phenotype with abnormal olfactory system development and defective embryonic GnRH cell migration to the basal forebrain. Human SEMA3A mutations (missense and frameshift) cause either impaired secretion of the protein (R66W, D538fsX31, V435I) or reduced signaling activity of the secreted protein (N153S, I400V, T688A, R733H) in GnRH cell line assays. |
Nrp1(sema/sema) mutant mouse histological analysis, SEMA3A variant transfection in COS-7 cells (secretion assay), GN11 GnRH cell signaling assay |
PLoS genetics |
High |
22927827
|
| 2001 |
Adult rat brain oligodendrocytes express neuropilin-1 (the major Sema3A receptor component) and CRMP2 and CRMP5. Sema3A causes a dramatic reduction in oligodendrocyte process extension, which is reversed by Sema3A removal or blocked by anti-neuropilin-1, anti-CRMP5, or anti-CRMP2 antibodies, demonstrating that a Sema3A signaling pathway involving neuropilin-1, CRMP2, and CRMP5 modulates oligodendrocyte process extension in the adult brain. |
Adult rat oligodendrocyte cultures, Sema3A-conditioned medium treatment, function-blocking antibodies, process extension quantification |
The Journal of neuroscience |
Medium |
11549731
|
| 2019 |
Disrupting Sema3A/Plexin-A1 inhibitory signaling in oligodendrocytes using a novel peptidic Plexin-A1 antagonist counteracts Sema3A inhibitory effects on oligodendrocyte migration and differentiation in vitro, and shows myelin-protective effects in the cuprizone demyelination/remyelination mouse model. |
In vitro oligodendrocyte migration and differentiation assay with Plexin-A1 antagonist peptide, cuprizone mouse model with DTI-MRI and histology, EAE model |
EMBO molecular medicine |
Medium |
31566924
|