| 1999 |
ATRAP (AGTRAP) was identified as a novel protein that specifically interacts with the carboxyl-terminal cytoplasmic domain of the AT1a receptor but not with AT2, m3 muscarinic, bradykinin B2, endothelin B, or beta2-adrenergic receptors. Overexpression of ATRAP in COS-7 cells markedly inhibited AT1a receptor-mediated activation of phospholipase C without affecting m3 receptor-mediated activation. |
Yeast two-hybrid screen, affinity chromatography, co-immunoprecipitation, fluorescence microscopy colocalization, functional PLC activation assay |
The Journal of biological chemistry |
High |
10358057
|
| 2000 |
Overexpression of ATRAP potentiated AT1 receptor internalization upon angiotensin II stimulation in vascular smooth muscle cells (VSMCs) and inhibited AT1 receptor-induced DNA synthesis, associated with inhibition of STAT3 and Akt phosphorylation. |
Transfection/overexpression in adult VSMCs, receptor internalization assay, DNA synthesis assay, Western blot for STAT3 and Akt phosphorylation |
Biochemical and biophysical research communications |
Medium |
11162453
|
| 2002 |
Human AGTRAP protein interacts with RACK1 (Receptor of Activated Protein C Kinase), as identified by yeast two-hybrid screening and confirmed by GST pull-down, co-immunoprecipitation, and surface plasmon resonance. |
Yeast two-hybrid, GST pull-down, co-immunoprecipitation, surface plasmon resonance |
The international journal of biochemistry & cell biology |
High |
11733189
|
| 2003 |
ATRAP is a transmembrane protein with three N-terminal hydrophobic domains (residues 14-36, 55-77, 88-108) and a hydrophilic C-terminal cytoplasmic tail (residues 109-161). Its N-terminus faces extracellularly, it localizes to intracellular trafficking vesicles (ER, Golgi, endocytic vesicles) and plasma membrane with constitutive translocation toward the plasma membrane. Deletion of the C-terminal domain abolishes AT1 receptor binding and causes perinuclear vesicle clustering. ATRAP overexpression decreases inositol lipid generation, suppresses angiotensin II-stimulated c-fos promoter activity, and decreases cell proliferation. |
Epitope-tagged constructs for topology determination, electron microscopy, immunofluorescence colocalization, real-time vesicle tracking, deletion mutant analysis, reporter gene assay, cell proliferation assay |
Molecular biology of the cell |
High |
12960423
|
| 2005 |
Overexpression of ATRAP significantly decreases the number of AT1 receptors on the surface of cardiomyocytes, decreases p38 MAPK phosphorylation, reduces c-fos promoter activity, and decreases protein synthesis upon angiotensin II treatment, indicating ATRAP promotes AT1R downregulation and attenuates hypertrophic responses. |
Overexpression in cardiomyocytes, surface receptor binding assay, Western blot for p38 phosphorylation, reporter gene assay, protein synthesis measurement |
FEBS letters |
Medium |
15757644
|
| 2006 |
ATRAP protein colocalizes with AT1 receptor in renal tubular cells in vivo, distributed along nephron segments from Bowman's capsules to inner medullary collecting ducts. Dietary salt depletion significantly decreased renal expression of both ATRAP and AT1 receptor. |
In situ hybridization, Western blot, immunohistochemistry, dietary salt manipulation |
Kidney international |
Medium |
16514431
|
| 2008 |
ATRAP is expressed in differentiated brown and white adipocytes; beta3-adrenergic stimulation suppresses ATRAP expression through JAK2/STAT signaling, as inhibition of PKA and JAK2 reversed the beta3-adrenergic suppression of ATRAP expression. |
Adipocyte differentiation and stimulation assays, Western blot for STAT1/STAT3 phosphorylation, pharmacological inhibitors of PKA and JAK2 |
Hormone and metabolic research |
Medium |
18236361
|
| 2010 |
Atrap-deficient (Atrap-/-) mice show increased arterial blood pressure, increased plasma volume, lower plasma renin concentration, and enhanced surface expression of AT1 receptors in the renal cortex with increased carboanhydrase-sensitive proximal tubular function, demonstrating that Atrap acts as a negative regulator of AT1 receptors in renal tubules in vivo. |
Atrap-/- mouse generation, blood pressure telemetry, plasma volume measurement, 125I-angiotensin II binding assay, renal cortex fractionation, carboanhydrase-sensitive proximal tubular function assay |
Journal of the American Society of Nephrology |
High |
20093357
|
| 2011 |
The PITP domain of RdgBβ (PITPNC1) interacts with ATRAP (AGTRAP), an integral membrane protein. Upon PMA treatment, RdgBβ is recruited to membranes via its PITP domain through interaction with ATRAP. |
Co-immunoprecipitation, PMA stimulation, membrane recruitment assay in COS-7 cells |
The Biochemical journal |
Medium |
21728994
|
| 2013 |
Agtrap-/- mice under high-fat dietary loading develop systemic metabolic dysfunction including increased fat accumulation, hypertension, dyslipidemia, insulin resistance, and adipose tissue inflammation. Subcutaneous transplantation of fat pads overexpressing ATRAP (from transgenic mice) to Agtrap-/- mice improved the systemic metabolic dysfunction, demonstrating a protective role of adipose ATRAP against insulin resistance. |
Agtrap-/- mouse generation, high-fat diet challenge, fat pad transplantation from ATRAP transgenic donors, metabolic phenotyping |
Journal of the American Heart Association |
High |
23902639
|
| 2014 |
Proteasomal degradation of ATRAP occurs during angiotensin II-induced cardiac hypertrophy; proteasome inhibitor bortezomib blocked ATRAP degradation and attenuated AT1R-mediated p38 MAPK and STAT3 signaling pathways, thereby reducing cardiac hypertrophy, fibrosis, and inflammation. |
Ang II infusion mouse model, bortezomib treatment, Western blot for proteasome activity, ATRAP protein levels, p38 MAPK and STAT3 phosphorylation |
Journal of molecular and cellular cardiology |
Medium |
25526681
|
| 2016 |
ATRAP interacts with the cardiac Ca2+-ATPase SERCA2a, confirmed by pull-down (MALDI-MS), co-immunoprecipitation, and surface plasmon resonance. ATRAP enhances SERCA-dependent Ca2+ uptake in isolated SR membrane vesicles. Atrap-/- myocytes show prolonged Ca2+ transient decay and sarcomere re-lengthening, and Atrap-/- mice have decreased maximum ventricular filling rate, indicating ATRAP facilitates ventricular relaxation via SERCA2a stimulation. |
Pull-down with MALDI-MS sequencing, co-immunoprecipitation, surface plasmon resonance, Ca2+ uptake assay in SR vesicles, cardiomyocyte sarcomere shortening and Ca2+ transient measurements, echocardiography in Atrap-/- mice |
Cardiovascular research |
High |
27015675
|
| 2019 |
Immunoproteasome subunit β5i (PSMB8) directly targets ATRAP for degradation. β5i knockout attenuated Ang II-induced atrial fibrillation, fibrosis, and oxidative stress, while restoring ATRAP levels. Overexpression of ATRAP abrogated Ang II-induced atrial remodeling and AF in β5i-overexpressing mice. Mechanistically, β5i-mediated ATRAP degradation leads to activation of AT1R-mediated NF-κB signaling, increased NADPH oxidase activity, and TGF-β1/Smad signaling. |
β5i KO mice, recombinant AAV9-β5i injection, AAV9-ATRAP overexpression, atrial electrophysiology (telemetry), Western blot, NADPH oxidase activity assay |
Hypertension |
High |
30571551
|
| 2019 |
Proximal tubule-specific ATRAP knockout (PT-KO) mice showed no significant difference in blood pressure at baseline or in pressor response to angiotensin II infusion compared to wild-type mice, indicating that ATRAP in renal proximal tubules has a minor role in angiotensin-dependent hypertension in vivo. |
Cre/loxP proximal tubule-specific ATRAP KO using Pepck-Cre, tail-cuff and radiotelemetric blood pressure measurement, angiotensin II infusion, laser-capture microdissection and immunohistochemistry |
Journal of the American Heart Association |
Medium |
30977419
|
| 2021 |
SAM (S-adenosylmethionine) upregulates ATRAP protein expression in NAFLD by methylating HuR protein, which controls HuR subcellular localization; HuR directly binds ATRAP mRNA and controls its nucleocytoplasmic shuttling for export from the nucleus, thereby regulating ATRAP translation. |
HuR methylation assay, RNA immunoprecipitation (HuR-ATRAP mRNA binding), nucleocytoplasmic fractionation, SAM supplementation in high-fat diet rats and oleic acid-treated L02 cells |
Cell death & disease |
Medium |
33753727
|
| 2022 |
In breast cancer cells, ATRAP directs USP14 (Ubiquitin-specific protease 14)-mediated deubiquitination and stabilization of PBX3 (Pre-B cell leukemia homeobox 3), and promotes AKT/mTOR signaling pathway activation; ATRAP is itself a transcriptional target of USF1 (Upstream stimulatory factor 1). |
Co-immunoprecipitation, microarray pathway analysis, siRNA knockdown, overexpression functional assays (proliferation, metastasis, glycolysis), rescue experiments |
International journal of biological sciences |
Medium |
35414770
|
| 2022 |
DJ-1 (PARK7) in hypoxia-conditioned MSC-derived extracellular vesicles suppresses cardiac hypertrophy by directly physically interacting with and inhibiting proteasome subunit PSMB10 activity, which in turn reduces ubiquitination-mediated degradation of ATRAP, thereby preserving AT1R-mediated signaling inhibition. |
Quantitative proteomics, co-immunoprecipitation (DJ-1/PSMB10), proteasome activity assay, ubiquitination assay for ATRAP, neonatal rat cardiomyocyte assays, TAC mouse model |
Pharmacological research |
Medium |
36509316
|
| 2022 |
Tubular ATRAP-mediated modulation of AT1R signaling regulates the accumulation of tubulointerstitial M2-polarized macrophages (marked by CD206), thereby affecting glomerular injury in diabetic nephropathy via tubule-glomerular crosstalk. Adoptive transfer of M2 macrophages into diabetic ATRAP-knockout mice ameliorated glomerular injury. |
Streptozotocin-induced diabetic ATRAP-KO mice, proximal tubule-specific ATRAP knockdown mice, adoptive macrophage transfer, immunohistochemistry for CD206, renal mRNA analysis for TNF-α and oxidative stress markers |
Kidney international |
Medium |
35240129
|
| 2023 |
miR-125a-5p and miR-125b-5p directly repress ATRAP/Atrap mRNA expression. Inhibition of miR-125a-5p/miR-125b-5p suppresses Ang II-AT1R signaling in mouse distal convoluted tubule cells by increasing ATRAP levels. |
miRNA target prediction, luciferase reporter assay for direct miRNA-ATRAP 3'UTR interaction, miRNA inhibitor treatment in mouse distal convoluted tubule cells, AT1R signaling readouts |
The Journal of biological chemistry |
Medium |
37981211
|
| 2025 |
miR-34a directly targets AGTRAP mRNA in human aortic smooth muscle cells (HASMC); Ang II upregulates miR-34a, which suppresses AGTRAP and SIRT1 expression; forced AGTRAP expression rescues miR-34a-induced pro-inflammatory gene upregulation (IL-6, COX2, MCP-1, MFGE8), establishing a negative feedback loop where AGTRAP downmodulation further enhances miR-34a expression. |
miR-34a overexpression in HASMC, luciferase reporter assay confirming direct miR-34a targeting of AGTRAP 3'UTR, AGTRAP forced expression rescue, Ang II stimulation, aging primate/rodent tissue analysis |
GeroScience |
Medium |
41291382
|
| 2026 |
AGTRAP knockdown in glioma cells suppressed proliferation, increased apoptosis, reduced IL-6 mRNA and protein levels, and attenuated JAK2/STAT3 activation; recombinant IL-6 partially restored JAK2/STAT3 signaling and mitigated growth inhibition caused by AGTRAP silencing, placing AGTRAP upstream of IL-6/JAK2/STAT3 in glioma. |
shRNA knockdown in A172 and U251 glioma cells, proliferation and apoptosis assays, IL-6 ELISA/Western blot, JAK2/STAT3 phosphorylation assay, recombinant IL-6 rescue, orthotopic xenograft model |
CNS neuroscience & therapeutics |
Medium |
41689202
|