| 2005 |
TIMP3 directly inhibits TACE (ADAM17), the TNF-alpha-converting enzyme. In insulin receptor heterozygous (Insr+/-) mice, TIMP3 deficiency led to unchecked TACE activity, increased soluble TNF-alpha, and subsequent diabetes and vascular inflammation. Pharmacological TACE inhibition reduced hyperglycemia, and Tace+/- mice showed increased insulin sensitivity, placing TIMP3 upstream of TACE-mediated TNF-alpha shedding in a metabolic/inflammatory pathway. |
Genetic mouse models (Insr+/-, Timp3+/-, double heterozygotes), TACE activity assays, TNF-alpha measurement, pharmacological TACE inhibition |
The Journal of clinical investigation |
High |
16294222
|
| 2012 |
TACE (ADAM17) exists predominantly as dimers at the cell surface under basal conditions; dimerization requires its cytoplasmic domain and enables efficient association with TIMP3, which silences TACE activity. Upon ERK or p38 MAPK activation, the dimer-to-monomer shift decreases TIMP3 association and increases TACE-mediated ectodomain shedding of TGF-alpha, establishing TIMP3 as a dimer-dependent inhibitor of TACE. |
Cell-surface TACE dimerization assays, co-immunoprecipitation of TIMP3 with TACE, MAPK pathway activation/inhibition, TGF-alpha shedding assays, cytoplasmic domain mutagenesis |
Science signaling |
High |
22550340
|
| 2007 |
TIMP3 inhibits alpha-secretase cleavage of amyloid precursor protein (APP) and ApoER2 by blocking ADAM-10 and ADAM-17. TIMP3 decreased surface levels of ADAM-10, APP, and ApoER2, increased APP beta-CTF and Abeta production, and directed APP toward endocytosis and beta-secretase cleavage rather than alpha-secretase cleavage. |
Recombinant TIMP3 treatment, ADAM-10/17 activity assays, Western blot for APP processing fragments, surface biotinylation, cell transfection in neuroblastoma/glia/COS7 cells |
The Journal of neuroscience |
Medium |
17913923
|
| 2009 |
TIMP3 deficiency in mice leads to accelerated TACE activity and elevated soluble TNF-alpha after ureteral obstruction, followed by enhanced MMP2 (but not MMP9) activation, increased fibrosis, and apoptosis. Additional deletion of TNF-alpha in TIMP3-/- mice markedly reduced inflammation and MMP induction, placing TIMP3 upstream of TACE-TNF-alpha-MMP signaling in renal injury. |
Genetic knockout mice (TIMP3-/-, TIMP3-/-/TNFalpha-/-), unilateral ureteral obstruction model, TACE activity assay, MMP zymography, histopathology, MMP inhibitor treatment |
Journal of the American Society of Nephrology : JASN |
High |
19406980
|
| 2012 |
TIMP3 stabilizes capillary tube networks and inhibits metalloproteolytic activity and angiogenic signaling in endothelial cells; this function is lost when pericytes transition to myofibroblasts. Pericyte-derived TIMP3 (in contrast to ADAMTS1) maintains microvascular stability, and Timp3-/- mice have spontaneous microvascular rarefaction and exaggerated fibrotic response to injury. |
3D capillary tube assays, Timp3-/- mice, in vivo kidney injury models, pericyte-myofibroblast differentiation assays, metalloproteolytic activity assays |
Journal of the American Society of Nephrology : JASN |
High |
22383695
|
| 2012 |
Loss of TIMP3 in the Akita diabetic mouse background selectively exacerbates diabetic renal injury (albuminuria, mesangial expansion, kidney hypertrophy) with elevated TACE activity, increased reactive oxygen species, NADPH oxidase activity, and PKCbeta1 elevation; cardiac function was unaffected, demonstrating a kidney-selective protective role of TIMP3 in diabetes. |
Double-mutant mice (TIMP3-/-/Akita), albuminuria measurement, TACE activity assay, ROS/NADPH oxidase assays, Western blot for PKC isoforms and signaling molecules |
American journal of physiology. Renal physiology |
High |
22896043
|
| 2012 |
Timp3 deficiency in Ang II-infused mice causes abdominal aortic aneurysm (AAA) with reduced collagen and elastin proteins (not mRNA), elevated MMP2 and broad proteolytic activities. Additional deletion of Mmp2 exacerbated AAA and rupture; bone marrow reconstitution with WT cells in Timp3-/-/Mmp2-/- mice reduced inflammation and prevented AAA, identifying an MMP-dependent and bone marrow inflammatory component downstream of TIMP3. |
Timp3-/- mice, Ang II infusion, Mmp2-/- double knockout, bone marrow transplantation, MMP inhibitor (PD166793) treatment, zymography, protein/mRNA analysis |
The Journal of biological chemistry |
High |
23144462
|
| 2013 |
TIMP3 deficiency in diabetic mice leads to reduced FoxO1 expression and its autophagy-related targets, with increased STAT1. Re-expression of TIMP3 in Timp3-/- mesangial cells rescued FoxO1 and its targets and decreased STAT1, establishing a TIMP3 → STAT1 → FoxO1 pathway in diabetic kidney disease. |
Diabetic Timp3-/- mice, microarray profiling, TIMP3 re-expression in mesangial cells, qPCR/Western blot for FoxO1, STAT1 knockdown rescue experiments, human kidney biopsy validation |
EMBO molecular medicine |
High |
23401241
|
| 2013 |
In renal injury after ureteral obstruction, TIMP3 deficiency (but not TIMP2 deficiency) increases MMP2 activation, TACE activity, caspase-3 activity, and fibrosis through collagen I/III, CTGF, TGF-beta/Smad2/3 pathway activation. TIMP2 deficiency blocks MMP2 activation and reduces fibrosis, demonstrating divergent and opposing roles: TIMP3 protects from damage while TIMP2 promotes injury through MMP2 activation. |
Timp2-/- and Timp3-/- mice, unilateral ureteral obstruction, gene microarray, zymography for MMP2 activation, TACE activity assay, caspase assay, histopathology |
Kidney international |
High |
23760282
|
| 2014 |
In Ang II-infused mice, TIMP3 deficiency produces excess fibrosis (without hypertrophy) involving post-translational stabilization and deposition of collagen by matricellular proteins osteopontin and SPARC, increased inflammation, and elevated TACE activity; this is distinct from TIMP2 deficiency effects and appears independent of canonical MMP-inhibitory function. |
TIMP2-/- and TIMP3-/- mice, Ang II infusion, adult cardiomyocyte/fibroblast co-culture, cyclic stretch assays, Western blot for osteopontin and SPARC, collagen quantification, TACE activity assay |
Cardiovascular research |
High |
24692173
|
| 2007 |
TIMP3 deficiency accelerates maladaptive cardiac remodeling after myocardial infarction, with greater left ventricular dilation, increased gelatinase MMP activity, elevated TNF-alpha levels, increased blood vessel density, cell proliferation, apoptosis in infarct area, and reduced collagen in remote myocardium, resulting in accelerated systolic dysfunction and higher mortality. |
Timp3-/- mice, coronary artery ligation, echocardiography, pressure-volume measurements, MMP zymography, histopathology, ELISA for TNF-alpha |
Journal of molecular and cellular cardiology |
High |
17945252
|
| 2015 |
TIMP3 promotes apoptosis in endothelial cells via a caspase-independent mechanism. The apoptotic activity is independent of MMP inhibitory activity and requires KDR (VEGFR2) expression. TIMP3 inhibits matrix-induced focal adhesion kinase (FAK) tyrosine phosphorylation, disrupts FAK association with paxillin, and prevents incorporation of beta3 integrin, FAK, and paxillin into focal adhesion contacts, an effect not reversed by caspase inhibitors. |
PAE/KDR vs PAE/beta-R cell lines, recombinant TIMP3 treatment, caspase inhibitor treatment, FAK phosphorylation assay, co-immunoprecipitation of FAK/paxillin, immunofluorescence of focal adhesions, in vivo tumor assay with TIMP3-overexpressing breast carcinoma cells |
Apoptosis : an international journal on programmed cell death |
High |
25558000
|
| 2016 |
TIMP3 accumulation in CADASIL acts through inhibition of ADAM17 and HB-EGF to regulate cerebral arterial tone and blood flow responses. In CADASIL mice, exogenous ADAM17 or HB-EGF restored cerebrovascular responses. Upregulated voltage-dependent potassium channel (KV) number in cerebral arterial myocytes was identified as a downstream effector of TIMP3-induced cerebrovascular deficits. |
TgNotch3(R169C) CADASIL mouse model, TgBAC-TIMP3 overexpressing mice, Timp3 haploinsufficiency rescue, cerebral blood flow measurements, ex vivo arterial tone assays, patch-clamp for KV channels, ADAM17/HB-EGF exogenous treatment |
eLife |
High |
27476853
|
| 2016 |
In CADASIL mice, elevated TIMP3 (but not Notch3 ECD deposition) impairs cerebral blood flow autoregulation and functional hyperemia. Haploinsufficiency of Timp3 rescues cerebrovascular reactivity deficits. A separate TgBAC-TIMP3 overexpressing mouse also displays attenuated myogenic responses of brain arteries, confirming TIMP3 level as a direct determinant of cerebrovascular function. |
TgNotch3(R169C) mice with Timp3 haploinsufficiency, TgBAC-TIMP3 transgenic mice, cerebral blood flow measurements (laser Doppler), ex vivo pressurized artery myogenic response assays |
Annals of neurology |
High |
26648042
|
| 2018 |
Pericyte ALK5 (TGF-beta receptor) signaling upregulates TIMP3 expression; pericyte-specific ALK5 knockout in embryonic mice downregulates TIMP3, leading to germinal matrix hemorrhage with abnormal microvessel dilation, reduced pericyte coverage, EC hyperproliferation, and enhanced perivascular MMP activity. Exogenous TIMP3 administration to ALK5-mutant embryos improved endothelial morphogenesis and attenuated hemorrhage, placing TIMP3 downstream of pericyte ALK5 in brain vascular morphogenesis. |
Pericyte-specific Alk5 conditional knockout mice, TIMP3 protein administration in vivo, histopathology, MMP activity assays, quantification of vascular phenotypes |
Developmental cell |
High |
29456135
|
| 1997 |
TIMP3 is expressed and secreted by retinal pigment epithelium (RPE), choroidal microcapillary endothelium, and pericytes. Unlike TIMP-1 and -2 (which are secreted into culture medium), TIMP3 localizes exclusively to the extracellular matrix and is not found in conditioned medium. In vivo, TIMP3 immunostaining is pronounced in Bruch's membrane, particularly near RPE and endothelial basement membranes. |
RT-PCR, Northern analysis, Western immunoblot of conditioned medium vs ECM fractions, immunohistochemistry of retina/choroid sections, cultured RPE/pericyte/endothelial cells |
Current eye research |
High |
9068940
|
| 1995 |
The human TIMP3 gene is TATA-less, initiates transcription at one major site, consists of five exons and four introns spanning ~30 kb, maps to chromosome 22q13.1, and gives rise to three distinct mRNAs via alternative polyadenylation. The first 112 bases of the promoter (containing multiple Sp1 sites) confer high basal expression; the region from -463 to -112 is a major determinant of serum inducibility, conferring cell cycle regulation. |
Genomic cloning and sequencing, somatic cell hybrid mapping, promoter-reporter deletion assays, serum stimulation of growth-arrested cells |
The Biochemical journal |
High |
7487894
|
| 2003 |
The SFD-associated S156C mutation in TIMP3 does not affect MMP inhibitory activity or metalloproteinase homeostasis in fibroblasts derived from mutant mice. Instead, mutant TIMP3(S156C) accumulates in the ECM (not due to altered turnover rate) and this accumulation alters cellular morphology. Loss of TIMP3 function in determining cellular morphology (not protease inhibition) is proposed as the pathogenic mechanism. |
Immortalized fibroblasts from Timp3-/- and Timp3(S156C/S156C) mice, MMP activity assays, ECM fractionation, pulse-chase for turnover rates, phenotypic analysis |
Journal of cellular physiology |
Medium |
12942551
|
| 2008 |
The S156C SFD mutation does not impair TIMP3's inhibitory activities toward TACE, ADAMTS4/5, aggrecan-cleaving MMPs, or its anti-angiogenic properties in fibrin bead assays. TIMP3 S156C blocks VEGF binding to VEGFR2 to the same extent as wild-type TIMP3. In contrast, Timp3-/- tissue shows significantly enhanced TACE activity (but not ADAMTS4/5 or MMP activity), suggesting compensatory inhibitors for the latter enzymes. |
Timp3 S156C knock-in and Timp3-/- mice, TACE/ADAMTS4/5/MMP activity assays from tissue extracts, fibrin bead angiogenesis assay, VEGF-VEGFR2 binding assay with recombinant proteins, rescue with recombinant TIMP3 |
Matrix biology : journal of the International Society for Matrix Biology |
High |
18295466
|
| 2012 |
TIMP3 deficiency leads to spontaneous accumulation and activation of hepatic CD4+, CD8+, and NKT cells. In Con A-induced autoimmune hepatitis, Timp3-/- mice have a greatly enhanced Th1 cytokine response and acute liver failure that mechanistically depends on TNF signaling. Bone marrow chimera experiments established that hepatic stromal (not hematopoietic) TIMP3 provides protection, with hepatocytes identified as the major source of Timp3 in resting liver. |
Timp3-/- mice, Con A model, bone marrow chimeras, flow cytometry of liver lymphocyte populations, Tnf genetic crosses, in situ hybridization/immunostaining for cell-type-specific Timp3 expression |
Journal of immunology (Baltimore, Md. : 1950) |
High |
22323541
|
| 2011 |
TIMP3 deficiency leads to TNF dysregulation, earlier caspase activation, accelerated mitochondrial apoptosis, faster loss of STAT3 and TGFbeta3, E-cadherin fragmentation, accelerated adipogenesis, and greater macrophage/T-cell infiltration during mammary gland involution. Crossing in Tnf deficiency abrogated caspase-3 activation but paradoxically heightened macrophage/T-cell influx, showing that TIMP3 differentially controls apoptosis (TNF-dependent) and inflammatory cell infiltration (TNF-independent) during involution. |
Timp3-/- and Timp3-/-/Tnf-/- mice, mammary gland involution model, caspase activity assays, Western blot for signaling molecules, flow cytometry/histopathology for immune cells |
PloS one |
High |
22053204
|
| 2014 |
TIMP3 loss in ApoE-/- mice increases atherosclerosis with greater macrophage plaque infiltration, elevated serum MCP-1, and expansion of inflammatory (M1) Gr1+ macrophages in circulation and aortic tissue, establishing TIMP3 as a regulator of macrophage inflammatory polarization in atherosclerosis. |
ApoE-/-/Timp3-/- double-knockout mice, en face aorta analysis, aortic root histology, FACS for macrophage subsets, serum MCP-1 ELISA, metabolomics |
Atherosclerosis |
High |
24943223
|
| 2014 |
Genetic loss of Timp3 protects mice from carcinogen-induced hepatocellular carcinoma (HCC): all WT mice developed HCC by 12 months, while only 33% of Timp3-/- mice did. Protection occurs through precocious activation of p53, p38, and Notch pathways, leading to hepatocyte senescence rather than apoptosis; TNF signaling was dispensable for this protection. |
Timp3-/- mice, diethylnitrosamine carcinogen model, immunohistochemistry and Western blot for p53/p38/Notch, senescence assays (SA-beta-Gal), apoptosis assays, Timp3-/-/Tnf-/- epistasis, Timp3-/- mouse embryo fibroblasts |
Oncogene |
High |
25347747
|
| 2015 |
In MMTV-PyMT and MMTV-Neu breast cancer models, Timp3 loss delays tumor onset and some mice remain tumor-free. The tumor-suppression in Timp3-null mice requires TNFR1 signaling. Transplantation experiments showed that Timp3 deficiency in the host stroma (not tumor cells) is sufficient to delay early but not advanced tumor growth. |
MMTV-PyMT/Timp3-/- and MMTV-Neu/Timp3-/- mice, Tnfr1 genetic crosses (epistasis), tumor cell transplantation into Timp3-/- hosts, tumor onset/incidence measurement |
PloS one |
High |
25807548
|
| 2017 |
Hepatocyte-specific TIMP3 overexpression (AlbT3 mice) improved glucose metabolism, hepatic fatty acid oxidation, and cholesterol homeostasis during high-fat diet. This was linked to regulation of ADAM17: hepatocyte-specific Adam17 knockout (A17LKO, but not myeloid Adam17 KO) similarly improved liver steatosis, placing TIMP3 upstream of hepatocyte ADAM17 in NAFLD protection. Both AlbT3 and A17LKO mice showed reduced hepatic tumorigenesis. |
Hepatocyte-specific TIMP3 transgenic (AlbT3), hepatocyte-specific Adam17 KO (A17LKO), myeloid-specific Adam17 KO (A17MKO) mice, HFD model, diethylnitrosamine tumor model, metabolic phenotyping, gene expression analysis |
Scientific reports |
High |
28751722
|
| 2018 |
TIMP3 is a CLOCK-dependent diurnal gene in human keratinocytes: CLOCK knockdown reduces TIMP3 expression rhythmically, and TIMP3 inversely regulates MMP-1 and inflammatory cytokines (TNF-alpha, CXCL1, IL-8). UVB exposure downregulates both CLOCK and TIMP3, increasing TNF-alpha secretion and CXCL1/IL-8 transcription via C/EBP-alpha. TIMP3 overexpression decreases, and knockdown increases, UVB-induced TNF-alpha secretion. |
CLOCK knockdown in keratinocytes, TIMP3 KD/OE, UVB irradiation, MMP-1 activity assay, ELISA for TNF-alpha, qPCR/Western blot for cytokines, circadian rhythm monitoring |
FASEB journal |
Medium |
29180440
|
| 2019 |
Glycosaminoglycans (specifically sulfated hyaluronan and heparin) influence MMP2/TIMP3 complex formation and MMP2 inhibition. Sulfated hyaluronan supports fibrillar co-alignment of MMP2 and TIMP3, stabilizing interactions between MMP2 hemopexin domain and TIMP3 C-terminal tail. Molecular modeling indicates that GAG can either support or preclude TIMP3-mediated MMP2 inhibition depending on the sequential order of complex formation. |
In vitro MMP2 activity assays with bone marrow stromal cells, MMP2/TIMP3 complex formation assays, in silico docking and molecular dynamics simulations, immunofluorescence imaging of fibrillar structures |
Scientific reports |
Medium |
30894640
|
| 2016 |
KDM1A (histone demethylase) promotes lung cancer metastasis by silencing TIMP3 through H3K4me2 demethylation at the TIMP3 promoter. KDM1A knockdown increases TIMP3, which in turn inhibits MMP2 expression and JNK phosphorylation. Restoring TIMP3 expression in KDM1A-deficient cells inhibits invasion/migration, and TIMP3 knockdown in KDM1A-deficient cells rescues metastatic capability. |
KDM1A KD/OE in NSCLC cells, ChIP-qPCR for H3K4me2 at TIMP3 promoter, TIMP3 KD rescue experiment, MMP2 activity assay, JNK phosphorylation assay, Transwell invasion assay, pharmacological inhibition |
Oncotarget |
Medium |
27058897
|
| 2017 |
Hepatocyte-specific TIMP3 overexpression or Adam17 deletion protected against iron overload-mediated cardiac dysfunction and liver injury. In Timp3-/- mice with iron overload, constituently lower ferroportin levels led to twofold higher hepatic iron accumulation, increased MMP-2 activation, and greater hepatic inflammatory cytokine and MMP-12/13 expression. |
Timp3-/- mice, chronic iron overload model, echocardiography, hepatic iron quantification, ferroportin Western blot, MMP zymography, gelatinase activity assay, histopathology |
American journal of physiology. Heart and circulatory physiology |
Medium |
29373036
|
| 2019 |
HDAC9 promotes trophoblast cell migration and invasion by repressing TIMP3 transcription through promoter histone hypoacetylation. In preeclampsia, HDAC9 is downregulated in syncytiotrophoblasts; HDAC9 knockdown increases histone acetylation at the TIMP3 promoter (confirmed by ChIP-qPCR), elevates TIMP3 expression, and inhibits cell migration and invasion in HTR-8/SVneo cells. |
ChIP-qPCR for histone acetylation at TIMP3 promoter, HDAC9 siRNA knockdown and rescue, Transwell migration/invasion assays, RT-qPCR and Western blot, immunohistochemistry in human placentas |
American journal of hypertension |
Medium |
30715128
|
| 2020 |
ALKBH5 (an m6A RNA demethylase) represses TIMP3 mRNA stability and protein production in non-small cell lung cancer. RIP-Seq identified TIMP3 mRNA as an ALKBH5-bound target; ALKBH5 knockdown increased TIMP3 expression and reduced tumor growth in vivo, establishing an ALKBH5-mediated m6A modification as a post-transcriptional regulator of TIMP3. |
RNA immunoprecipitation sequencing (RIP-Seq), ALKBH5 KD/OE, mRNA stability assay, Western blot, in vivo xenograft, RT-qPCR |
Gene |
Medium |
31927006
|
| 2021 |
LncRNA ROR recruits histone methyltransferase MLL1 to promote H3K4 trimethylation at the TIMP3 locus, enhancing TIMP3 transcription and breast cancer progression. RIP, RNA pull-down, and ChIP assays confirmed lncRNA ROR-MLL1-H3K4me3-TIMP3 axis; lncRNA ROR knockdown inhibited breast cancer cell invasion and tumor growth through downregulation of TIMP3. |
RIP assay, RNA pull-down, ChIP for H3K4me3 at TIMP3, lncRNA ROR KD/OE, Transwell invasion assay, in vivo xenograft |
Journal of translational medicine |
Medium |
33653378
|