| 2001 |
LOXL4 was identified as a novel lysyl oxidase family member with a conserved C-terminal copper-binding site, lysyl and tyrosyl residues, and a cytokine receptor-like domain. It contains four N-terminal SRCR domains, one of which has a unique 13 amino acid insertion encoded by a short exon not present in LOXL2 or LOXL3. The gene is located on chromosome 10q24 and spans 14 exons. |
cDNA cloning, sequence analysis, genomic structure determination |
Matrix biology |
High |
11691588
|
| 2007 |
Reintroduction of LOXL4 into human bladder cancer cells decreased colony formation ability and antagonized Ras in activating the ERK signaling pathway, establishing LOXL4 as a functional tumor suppressor acting through inhibition of the Ras/ERK pathway. |
Gene reintroduction (overexpression), colony formation assay, ERK signaling western blot, promoter methylation analysis |
Cancer research |
Medium |
17456585
|
| 2008 |
LOXL4 gene overexpression in HNSCC cells is driven by de novo transcription, with TATA (-25) and SP1 (-181) binding sites showing increased nuclear extract binding activity in HNSCC cells compared to normal epithelial cells, indicating these transcription factors regulate LOXL4 upregulation. |
Promoter deletion analysis, reporter gene assays, DNA-binding (EMSA) experiments with nuclear extracts |
International journal of oncology |
Medium |
18949373
|
| 2008 |
LOXL4 protein in cultured primary hypopharyngeal HTB-43 carcinoma cells localizes perinuclearly and at the cell surface, but not in the nucleus, suggesting cell surface-associated functions in tumor cell adhesion and extracellular matrix interactions. |
Immunocytochemistry in cultured HNSCC cells with LOXL4-specific antibody |
European journal of cancer |
Medium |
18499440
|
| 2013 |
TGF-β1 induces LOXL4 expression in aortic endothelial cells via a mechanism requiring both a distal AP-1 site and a Smad binding element in the LOXL4 promoter. Functional cooperation between Smad proteins and the AP-1 complex composed of JunB/Fra2 mediates TGF-β1 induction, involving ERK-dependent phosphorylation of Fra2. LOXL4 is extracellularly secreted and contributes to ECM deposition and assembly. |
Promoter deletion mapping, mutagenesis analysis, reporter gene assays, western blotting for ERK phosphorylation, chromatin immunoprecipitation, secretion assays |
Molecular and cellular biology |
High |
23572561
|
| 2014 |
LOXL4 promotes gastric cancer cell proliferation, migration and invasion, and activates the FAK/Src pathway to enhance cell-extracellular matrix adhesion. Recombinant human LOXL4 protein also promoted GC cell proliferation and migration, indicating extracellular LOXL4 activity. |
Overexpression, RNA interference, recombinant protein treatment, western blot for FAK/Src pathway, migration/invasion assays |
Journal of cancer research and clinical oncology |
Medium |
25216702
|
| 2014 |
LOXL4 is a direct target of miR-193a-3p; miR-193a-3p promotes multi-drug resistance in bladder cancer cells through suppression of LOXL4, and this resistance is mediated downstream via the Oxidative Stress pathway. |
miRNA overexpression/inhibition, luciferase reporter assay, xenograft tumor model, oxidative stress pathway analysis |
Molecular cancer |
Medium |
25311867
|
| 2017 |
LOXL4 knockdown in triple-negative breast cancer cells increased primary tumor growth and lung colonization in mouse xenograft models, accompanied by increased collagen I and IV, lysine hydroxylase 1 and 2, and prolyl 4-hydroxylase subunit alpha 1 and 2 levels. Second harmonic generation imaging showed LOXL4 knockdown resulted in thickening of collagen bundles, indicating LOXL4 suppresses collagen synthesis, deposition, and structural changes in the ECM. |
shRNA knockdown, mouse xenograft model, second harmonic generation imaging, western blotting for collagen-related proteins |
Oncotarget |
Medium |
28060764
|
| 2019 |
HCC-derived exosomes transfer LOXL4 between HCC cells and to HUVECs. Intracellular (but not extracellular) LOXL4 promotes cell migration by activating the FAK/Src pathway dependent on its amine oxidase activity through a hydrogen peroxide-mediated mechanism. Exosome-transferred LOXL4 promotes angiogenesis via a paracrine mechanism. |
Exosome isolation and characterization, overexpression/shRNA knockdown, deletion mutants including amine oxidase domain mutants, western blot for FAK/Src, migration assays, in vivo metastasis models |
Molecular cancer |
High |
30704479
|
| 2019 |
5-azacytidine (5-aza-CR) induces LOXL4 upregulation in liver cancer cells, and LOXL4 subsequently binds the basic domain of p53 via its low-isoelectric point region, inducing reactivation of compromised wild-type p53 and resulting in cell death. The LOXL4-p53 interaction was identified through genome-wide screening. |
Genome-wide screen, co-immunoprecipitation (LOXL4-p53 binding), domain mapping, xenograft tumor model, cell viability assays |
Cell death and differentiation |
High |
30728460
|
| 2020 |
EZH2 inhibition enhances miR-30d and miR-29b transcription via promoter binding, reducing LOXL4 expression. LOXL4 was identified as a direct target of miR-29b and miR-30d (validated by dual-luciferase reporter assay and ChIP). EZH2-mediated epigenetic silencing of miR-29b/miR-30d results in elevated LOXL4, promoting breast cancer cell proliferation, migration, and metastasis. |
Dual-luciferase reporter assay, chromatin immunoprecipitation, qRT-PCR, western blotting, xenograft experiments |
Theranostics |
High |
32754259
|
| 2021 |
Genetic ablation of LOXL4 in mice did not induce more severe thoracic or abdominal aortic aneurysm compared to wild-type mice under angiotensin II infusion, indicating LOXL4 does not play a major role in angiotensin II-induced aortic aneurysm development. |
LOXL4 knockout mouse generation, angiotensin II subcutaneous infusion, aortic aneurysm assessment |
Genes |
Medium |
33807332
|
| 2023 |
Genetic ablation of LOXL4 (but not LOXL2) markedly disrupts pathological collagen cross-linking and fibrosis in the lung. Combined knockout of Loxl2 and Loxl4 does not offer additive antifibrotic effects over Loxl4 deletion alone, and LOXL4 deficiency decreases expression of other LOX family members including Loxl2, establishing LOXL4 as the primary LOX activity underlying pathological collagen cross-linking in lung fibrosis. |
Genetic knockout mice (Loxl2 KO, Loxl4 KO, double KO), pulmonary fibrosis model, collagen cross-linking analysis, gene expression analysis |
Science advances |
High |
37235663
|
| 2023 |
LOXL4 shuttled by tumor cell-derived extracellular vesicles is delivered into macrophages, where it activates STAT1 signaling to induce PD-L1 expression, suppressing CD8+ T cell killing activity and promoting immune escape in hepatocellular carcinoma. |
EV isolation and delivery, in vitro macrophage/CD8+ T cell co-culture assay, in vivo orthotopic xenograft model, western blot for STAT1/PD-L1 |
Journal of immunotherapy |
Medium |
38047403
|
| 2023 |
ZEB1 (in its Zn2+-bound active form) acts as a transcription factor that drives expression of LOXL1 and LOXL4. Mutation of the Zn-finger motifs of ZEB1 (MutZEB1 ΔZn) leads to significant downregulation of LOXL1 and LOXL4, loss of EMT, and stalled invasion in MDA-MB-231 cells. |
Stable expression of MutZEB1 (ΔZn) in MDA-MB-231 cells, invasion assays, RNA-Seq analysis |
Frontiers in oncology |
Medium |
36910659
|
| 2025 |
TGF-β1 decreases LOXL4 protein (but not mRNA) expression in MDA-MB-231 breast cancer cells via proteasomal degradation through MEK/ERK pathway activation. Bortezomib (proteasomal inhibitor) suppresses TGF-β1-mediated LOXL4 reduction and inhibits TGF-β1-induced MEK/ERK pathways. N-glycosylation dysregulation is involved in reduction of LOXL4 secretion. |
Proteasomal inhibitor treatment, MEK/ERK inhibition, ROS measurement, western blotting for LOXL4 protein vs. mRNA levels, N-glycosylation analysis |
Journal of receptor and signal transduction research |
Medium |
39862152
|
| 2026 |
LOXL4 promotes ubiquitination and degradation of SOCS3 (suppressor of cytokine signaling 3), relieving SOCS3-mediated inhibition of JAK2 and leading to sustained STAT3 activation. This LOXL4-SOCS3-STAT3 axis enhances DNA damage repair, inhibits apoptosis, and fosters an immunosuppressive tumor microenvironment, driving radiotherapy resistance in glioma. |
Co-immunoprecipitation, mass spectrometry, stable RT-resistant cell models, functional assays for DNA repair and apoptosis, orthotopic glioma mouse model |
International immunopharmacology |
Medium |
42134289
|