| 1995 |
GAX/MEOX2 mRNA is rapidly down-regulated in vascular smooth muscle cells (VSMCs) in vivo in response to balloon angioplasty-induced endothelial denudation, mirroring its down-regulation by mitogens in vitro; this growth-arrest specific expression pattern suggests GAX maintains the non-proliferative contractile phenotype of VSMCs. |
Northern blot and in vivo balloon injury model in rat carotid arteries |
The Journal of biological chemistry |
Medium |
7890661
|
| 1995 |
The Gax promoter minimal core region (138 bp, −125 to +13) requires at least three positive transcriptional activators: Sp1 (binding a G/C-rich element), MEF2/RSRF (binding a MADS-box site), and a third factor HRF-1 (binding an inverted palindromic motif); MEF2A overexpression transactivates the Gax promoter, establishing a direct transcriptional link between MEF2 and Gax. |
Transient transfection, deletion analysis, site-directed mutagenesis, protein-DNA binding assays, MEF2A overexpression |
Molecular and cellular biology |
High |
7623821
|
| 1994 |
The human GAX gene was cloned and mapped by fluorescence in situ hybridization to chromosome 7p21; its coding sequence is 98% conserved with rat GAX at the amino acid level and encodes a homeodomain protein with a polyhistidine/glutamine (CAX repeat) region N-terminal to the homeodomain. |
Anchored PCR cloning from cardiovascular cDNA, FISH chromosomal mapping |
Genomics |
High |
7713505
|
| 1997 |
Recombinant Gax protein microinjected into VSMCs and fibroblasts inhibited mitogen-induced S-phase entry; adenoviral overexpression of Gax caused G0/G1 arrest correlated with p53-independent upregulation of the CDK inhibitor p21, association of p21 with cdk2 complexes, and reduction in cdk2 activity; p21-deficient fibroblasts were refractory to Gax-induced growth inhibition, establishing Gax-mediated cell cycle arrest as p21-dependent. |
Microinjection of recombinant protein, adenoviral overexpression, cell cycle analysis, cdk2 activity assay, p21 knockout fibroblasts |
Genes & development |
High |
9224717
|
| 1997 |
Gax protein is expressed in nuclei of cardiomyocytes during late cardiac development (when myocyte proliferation is declining) and forced precocious Gax nuclear expression via adenovirus inhibited cardiomyocyte clonal expansion and reduced PCNA positivity, resulting in abnormal heart morphology (small ventricles, thinned compact zone), establishing Gax as a negative regulator of cardiomyocyte proliferation during morphogenesis. |
Adenoviral overexpression in chick embryo hearts, immunohistochemistry, PCNA staining, clonal analysis |
Development (Cambridge, England) |
Medium |
9334288
|
| 1997 |
Gax is expressed in all muscle lineages during mouse embryogenesis; immunohistochemistry and in situ hybridization placed Gax protein in lateral plate mesoderm, cardiac muscle (biphasic pattern), smooth muscle (from E9.5), and skeletal muscle (premyogenic cells and myotomes), prior to expression of myogenic bHLH and MEF2 proteins in skeletal muscle. |
Immunohistochemistry and in situ hybridization on mouse embryos |
Circulation research |
Medium |
9118475
|
| 1997 |
Angiotensin II (via AT1 receptor) suppresses Gax mRNA expression in quiescent VSMCs, while C-type natriuretic peptide (CNP) upregulates Gax mRNA via a cGMP-dependent mechanism; simultaneous CNP administration attenuates Ang II-induced Gax down-regulation, placing Gax as a common transcriptional effector in opposing vascular growth-regulatory signaling pathways. |
Northern blot, pharmacological antagonism (AT1R blocker CV11974), cGMP analogue treatment |
Hypertension |
Medium |
9039131
|
| 1998 |
Forced Gax expression induces apoptosis in mitogen-activated but not quiescent vascular cells via Bcl-2 down-regulation and Bax up-regulation; fibroblasts homozygous null for Bax were refractory to Gax-induced apoptosis, demonstrating that Gax-mediated cell death requires Bax and is independent of p21, p53, and cell cycle activity. |
Adenoviral overexpression, Bax knockout MEFs, Bcl-2/Bax Western blot, apoptosis assays with cell cycle inhibitors |
The EMBO journal |
High |
9649428
|
| 1999 |
Gax expression inhibits VSMC and fibroblast migration toward PDGF-BB, bFGF, and HGF; this requires p21 (p21-deficient fibroblasts were resistant but rescued by exogenous p21 or p16); Gax specifically down-regulates αvβ3 and αvβ5 integrin expression in VSMCs in vitro and in vivo after vascular injury, suggesting integrin repression as the mechanism for reduced cell motility. |
Adenoviral Gax transduction, transwell migration assays, p21/p53 knockout fibroblasts, flow cytometry for integrin expression, in vivo immunostaining post-balloon injury |
The Journal of clinical investigation |
High |
10562309
|
| 2003 |
Gax is expressed in vascular endothelial cells and its adenoviral overexpression in HUVECs inhibits proliferation, mitogen-stimulated thymidine uptake, and tube formation on Matrigel, accompanied by up to 5-fold induction of p21 mRNA and 4–5-fold activation of the p21 promoter, establishing Gax as a negative regulator of the angiogenic phenotype in endothelial cells. |
Adenoviral overexpression, thymidine incorporation, Matrigel tube formation, Northern blot, promoter activity assay |
The Journal of surgical research |
Medium |
12842453
|
| 2005 |
In brain endothelial cells (BECs) from Alzheimer disease patients, MEOX2 expression is reduced independent of age; viral-mediated MEOX2 gene transfer in AD BECs stimulates angiogenesis, transcriptionally suppresses AFX1 forkhead factor-mediated apoptosis, and increases LRP1 levels at the blood-brain barrier; Meox2 knockout mice exhibit reduced brain capillary density, reduced cerebral blood flow, loss of hypoxia-induced angiogenic response, and impaired Aβ efflux due to reduced LRP levels. |
Transcriptional profiling of human BECs, viral-mediated gene silencing and transfer, Meox2 knockout mouse model, cerebral blood flow measurement, Aβ efflux assay |
Nature medicine |
High |
16116430
|
| 2005 |
MEOX2 binds to RING finger protein 10 (RNF10) as determined by yeast two-hybrid screening, in vitro pull-down, and co-immunoprecipitation in mammalian cells; the minimal RNF10-binding region of MEOX2 maps to amino acids 101–185 (between the HQ-rich domain and homeodomain); RNF10 co-expression enhances MEOX2 activation of the p21WAF1 promoter. |
Yeast two-hybrid screen, in vitro pull-down, co-immunoprecipitation, p21 promoter reporter assay |
Molecular and cellular biochemistry |
Medium |
16335786
|
| 2006 |
Meox-2 knockout mice display cleft palate (35.3% of Meox-2−/− embryos) arising from breakdown of already-fused palatal shelves (post-fusion mechanism), distinct from previously reported pre-fusion cleft palate mechanisms; Meox-2 expression marks early palatal mesenchymal cells from E11.5 and the posterior palate from E12.5–E15.5. |
Knockout mouse analysis, histology, in situ hybridization, timed embryo collection |
Developmental dynamics |
Medium |
16284941
|
| 2006 |
GAX directly activates p21WAF1/CIP1 transcription through multiple upstream ATTA-containing binding sites (~15 kb upstream of the ATG); chromatin immunoprecipitation confirmed GAX occupancy at these sites in vivo; homeodomain and N-terminal domain are required for transactivation; G0/G1 arrest ability correlates with p21 promoter transactivation ability. |
ChIP, GAX deletion constructs, luciferase reporter assays with p21 promoter fragments, site-directed mutagenesis of binding sites |
The Journal of biological chemistry |
High |
17074759
|
| 2007 |
miR-130a down-regulates GAX expression through two targeting sites in a 280-bp fragment of the GAX 3′-UTR; forced miR-130a expression inhibits GAX through this specific sequence; miR-130a also targets HOXA5 3′-UTR; together, miR-130a regulates the angiogenic phenotype of endothelial cells by modulating GAX and HOXA5. |
Luciferase reporter assay with GAX 3′-UTR, miR-130a overexpression, promoter activity assays |
Blood |
Medium |
17957028
|
| 2007 |
MEOX2 is a TGF-β/Smad target gene in epithelial cells; MEOX2 knockdown prevents TGF-β1-induced cytostatic response; ectopic MEOX2 suppresses epithelial proliferation cooperatively with TGF-β1 and induces p21 through a distal p53-binding region of the p21 promoter; MEOX2 forms protein complexes with Smads leading to cooperative p21 regulation; MEOX2 fails to induce EMT and inhibits TGF-β-induced EMT, placing MEOX2 specifically in the TGF-β tumor suppressor pathway. |
RNAi knockdown, ectopic expression, co-immunoprecipitation with Smads, p21 promoter deletion analysis, proliferation and EMT assays |
Molecular oncology |
High |
19383287
|
| 2005 |
Angiotensin II suppresses Gax expression in VSMCs via oxidative stress-activated ERK1/2 (not p38 MAPK); H2O2 mimics Ang II-induced Gax down-regulation; antioxidants (NAC, PDTC) and the ERK1/2 inhibitor PD98059 block Ang II- and H2O2-induced Gax suppression, whereas the p38 inhibitor SB203580 does not. |
Pharmacological inhibition of ERK1/2 and p38 MAPK, antioxidant treatment, Northern blot/RT-PCR, intracellular H2O2 measurement |
Regulatory peptides |
Medium |
15680482
|
| 2009 |
MEOX2 is a direct transcriptional activator of the INK4a (p16) promoter; forced MEOX2 expression induces premature senescence that is dependent on INK4a activity; ChIP confirms direct MEOX2 binding to the INK4a promoter; MEOX2 transcription is enhanced in primary cells during senescence induction. |
Genome-scale cDNA overexpression screen, ChIP, INK4a reporter assay, senescence assays, INK4a activity dependence testing |
PloS one |
Medium |
19340300
|
| 2010 |
MEOX2 localizes to the nuclear fraction in endothelial cells; co-immunoprecipitation shows MEOX2 binds to both p65 (RelA) and IκBβ in the nucleus; immunofluorescence confirms colocalization requiring the MEOX2 homeodomain and N-terminal domain; MEOX2 has a biphasic effect on NF-κB-dependent promoters (stimulates at low levels, represses at high levels), both effects dependent on the homeodomain and N-terminal domain. |
Subcellular fractionation, co-immunoprecipitation, immunofluorescence, NF-κB promoter reporter assays, MEOX2 domain deletion constructs |
Cardiovascular research |
Medium |
20421348
|
| 2010 |
miR-221 upregulates GAX expression in endothelial cells indirectly by downregulating ZEB2; ZEB2 is a repressor of GAX that binds two sites on the GAX promoter as shown by ChIP; serum upregulates ZEB2 which downregulates GAX; a mutant miR-221 fails to downregulate ZEB2 or upregulate GAX. |
miR-221 overexpression and inhibition, ChIP for ZEB2 binding at GAX promoter, miR-221 mutant constructs, Western blot |
Molecular and cellular biology |
Medium |
20516212
|
| 2011 |
Both MEOX1 and MEOX2 induce p21CIP1/WAF1 and p16INK4a expression and cause endothelial cell cycle arrest and senescence; however, they use distinct mechanisms: MEOX1 and MEOX2 activate p16INK4a in a DNA binding-dependent manner, whereas they induce p21CIP1/WAF1 in a DNA binding-independent manner. |
MEOX1/MEOX2 overexpression with DNA-binding mutants, cell cycle analysis, senescence assays, p21 and p16 reporter assays |
PloS one |
Medium |
22206000
|
| 2011 |
The miRNA family miR-130/301/721 enhances iPSC generation from murine fibroblasts by repressing Meox2; miRNA-resistant Meox2 overexpression abrogates the pro-reprogramming effects of this miRNA family; Meox2-specific silencing mimics the miRNA family effects on reprogramming. |
miRNA library screen, miRNA-resistant Meox2 construct, Meox2 siRNA silencing, iPSC reprogramming efficiency assay |
EMBO reports |
Medium |
21941297
|
| 2013 |
In cardiac fibroblast-to-myofibroblast phenoconversion, Meox2 expression is reduced while Zeb2 increases; Ski overexpression restores Meox2 mRNA by suppressing Zeb2; overexpression of Meox2 (but not a DNA-binding mutant) shifts myofibroblasts back toward the fibroblast phenotype, establishing a Ski→(suppresses Zeb2)→(de-represses Meox2) pathway that regulates the cardiac myofibroblast phenotype. |
Overexpression and knockdown in cardiac fibroblasts, Meox2 DNA-binding mutant, Western blot, RT-PCR, myofibroblast phenotype markers |
Journal of cell science |
Medium |
24155330
|
| 2015 |
Meox2 and Tcf15 form heterodimers that act as transcriptional determinants of heart capillary endothelial cell identity; Meox2/Tcf15 drive endothelial CD36 and lipoprotein lipase expression to mediate fatty acid uptake in heart ECs and facilitate FA transport to cardiomyocytes; combined Meox2/Tcf15 haplodeficiency impairs cardiac FA uptake and reduces FA transfer, leading to impaired cardiac contractility. |
Microarray profiling of freshly isolated ECs, gain- and loss-of-function (haplodeficiency mouse model), FA uptake assays, CD36/LPL expression analysis |
Circulation |
High |
25561514
|
| 2016 |
Meox2 haploinsufficiency in DBA/2J glaucoma mice significantly increases axon damage in the optic nerve head and is associated with modulation of age- and disease-specific vascular and myeloid alterations, supporting a role for Meox2 in IOP-dependent vascular remodeling and neuroinflammation that promotes axon survival. |
Meox2 haploinsufficient DBA/2J mouse model, axon counting, immunofluorescence, upstream regulator analysis |
Investigative ophthalmology & visual science |
Medium |
31369031
|
| 2016 |
Gax overexpression in human VSMCs increases differentiation markers calponin and SM-MHC 11, suppresses proliferation and migration, and transcriptomic analysis identified Rap1A as a downstream target of Gax; Gax overexpression significantly inhibits Rap1A expression and reduces neointimal formation in carotid artery injury in mice, indicating that Gax maintains VSMC contractile phenotype partly by suppressing Rap1A. |
Western blot, cDNA array analysis, adenoviral overexpression and silencing, Rap1A overexpression, in vivo mouse carotid injury model |
American journal of translational research |
Medium |
27508012
|
| 2022 |
MEOX2 enhances ERK signaling in glioblastoma through a feed-forward mechanism; Ser155 (upstream of the homeodomain) is a putative ERK-dependent phosphorylation site and S155A substitution affects MEOX2 protein levels and alters its subnuclear localization; MEOX2 overexpression cooperates with p53 and PTEN loss to induce cell proliferation in cerebral organoid glioma models. |
ERK phosphorylation Western blot, S155A site mutagenesis, subnuclear localization imaging, cerebral organoid glioma model, RNA-seq, ACT-seq, CUT&Tag |
Neuro-oncology |
Medium |
35468210
|
| 2022 |
MEOX2 directly transcriptionally activates Cathepsin S (CTSS) in glioma cells, as shown by RNA-sequencing, ChIP-qPCR, and luciferase reporter assays; MEOX2 knockdown inhibits glioma cell proliferation, motility, EMT, focal adhesion formation, and F-actin assembly; MEOX2 promotes glioma tumor growth in vivo. |
shRNA knockdown, RNA-sequencing, ChIP-qPCR, luciferase reporter assay, intracranial mouse implantation model |
Cell death & disease |
Medium |
35436995
|
| 2022 |
ABI2 directly interacts with MEOX2 (co-immunoprecipitation), and MEOX2 binds to the KLF4 and NANOG promoter regions to activate their transcription in hepatocellular carcinoma; this ABI2/MEOX2/KLF4-NANOG axis maintains cancer stem cell populations and drives HCC stemness, growth, and sorafenib resistance. |
Co-immunoprecipitation, ChIP at KLF4 and NANOG promoters, ABI2 knockdown, MEOX2 overexpression rescue, xenograft model |
Liver international |
Medium |
36017822
|
| 2022 |
MEOX2 is expressed in the nuclei of a subset of mouse DRG sensory neurons; Meox2+/− heterozygous mice show impaired nociception with altered action potential initiation; mechanistically, MEOX2 loss decreases expression of Scn9a (Nav1.7) and Scn11a (Nav1.9) voltage-gated sodium channel genes, as well as other pain-associated genes (PENK, NPY), establishing MEOX2 as a transcriptional regulator maintaining nociceptor gene programs. |
Heterozygous mouse model, behavioral/electrophysiological analyses, transcriptomic analysis of DRG, immunofluorescence |
The FEBS journal |
Medium |
35029322
|
| 2024 |
MEOX2 binds the PHLPP phosphatase promoter (by dual luciferase reporter assay) and up-regulates PHLPP transcription, leading to inhibition of AKT phosphorylation (p-AKT) in hepatic stellate cells (HSCs); MEOX2 overexpression inhibits HSC proliferation and slows liver fibrosis progression through this MEOX2→PHLPP→(inhibit AKT) axis. |
Dual luciferase reporter assay for PHLPP promoter, OE-MEOX2/sh-MEOX2 lentivirus, Western blot for p-AKT, CCK-8 and EdU proliferation assays |
Discovery medicine |
Medium |
38926106
|
| 2023 |
RNF10 overexpression in H9C2 cardiomyocytes promotes MEOX2 expression and inhibits AP-1 activation, alleviating pirarubicin-induced apoptosis; RNF10 knockdown produces the opposite effect; in vivo, THP-induced CRC is associated with decreased RNF10 and Meox2 and activated AP-1, placing RNF10 upstream of MEOX2 in the AP-1/Meox2 pathway modulating cardiomyocyte apoptosis. |
siRNA knockdown, lentiviral overexpression, Western blot, flow cytometry for apoptosis, rat in vivo CRC model |
Oxidative medicine and cellular longevity |
Medium |
36713029
|
| 2025 |
NAT10-mediated ac4C modification of MEOX2 mRNA at nucleotides 409–423 stabilizes MEOX2 mRNA and increases its expression; NAT10 knockdown reduces ac4C modification at this site, decreases MEOX2 mRNA stability and protein expression, and consequently enhances HUVEC migration, invasion, and tube formation in high-glucose conditions; MEOX2 overexpression reverses these effects. |
MeRIP-qPCR for ac4C modification, RIP, RNA stability assay, NAT10 knockdown, MEOX2 overexpression rescue, functional HUVEC assays |
Applied biochemistry and biotechnology |
Medium |
41082000
|
| 2026 |
MEOX2 promotes DNA damage repair in glioblastoma stem-like cells; co-immunoprecipitation and mass spectrometry identified PARP1 as a direct MEOX2 interactor; MEOX2 depletion reduces PARylation levels and sensitizes GSCs to the PARP1 inhibitor Talazoparib; MEOX2 knockdown in a GLICO model impairs tumor growth and increases sensitivity to temozolomide. |
Co-immunoprecipitation, mass spectrometry, GLICO organoid model, shRNA knockdown, Talazoparib sensitivity assay, PARylation measurement |
Cancer letters |
Medium |
41620199
|