| 2006 |
PERK phosphorylates eIF2α, which leads to translational upregulation of ATF4, placing ATF4 downstream of PERK-eIF2α in the UPR/integrated stress response. Cells with compromised PERK-eIF2α-ATF4 signaling are more sensitive to hypoxic stress in vitro and form slower-growing tumors in vivo. |
Genetic loss-of-function (PERK-deficient and eIF2α mutant MEFs), in vitro hypoxia assays, xenograft tumor models |
Cancer biology & therapy |
High |
16861899
|
| 2008 |
ATF4 is necessary and sufficient for ER stress-induced transcriptional upregulation of REDD1. In MEFs lacking ATF4, ER stress fails to upregulate REDD1 mRNA, while exogenous ATF4 expression is sufficient to induce REDD1. |
ATF4-deficient MEFs, PERK-deficient MEFs, exogenous ATF4 overexpression, mRNA expression analysis |
Biochemical and biophysical research communications |
High |
19114033
|
| 2013 |
ATF4 directly interacts with HIF-1α in hypoxic osteoblasts and promotes HIF-1α protein stability by reducing its binding to prolyl hydroxylases, thereby preventing pVHL-mediated proteasomal degradation. Loss of ATF4 increases HIF-1α ubiquitination and reduces VEGF expression, impairing bone angiogenesis. |
Co-immunoprecipitation, ubiquitination assay, ATF4 knockout mice, in vitro osteoblast studies, metatarsal sprouting assay |
Journal of bone and mineral research |
High |
23649506
|
| 2013 |
ATF4 transcriptionally upregulates sestrin-2 (SESN2), which in turn inhibits mTOR complex activity and induces autophagy. Ectopic ATF4 expression (but not ATF3 or CHOP) is sufficient to drive SESN2 transcription. |
Ectopic expression of ATF4, ATF3, CHOP; mRNA and protein expression analysis; mTOR activity assay; autophagy readout |
Molecular oncology |
Medium |
23916134
|
| 2014 |
ATF4 mRNA is locally translated in axons in response to Aβ1-42 and the resulting ATF4 protein is retrogradely transported to the nucleus where it drives transcriptional activity and cell loss. Inhibition of local translation, retrograde transport, or knockdown of axonal Atf4 mRNA abolishes these effects. |
Local Aβ application to axons, knockdown of axonal Atf4 mRNA with siRNA, retrograde transport inhibition, in vivo dentate gyrus injection in mice, analysis of AD patient brain tissue |
Cell |
High |
25171414
|
| 2014 |
ATF4 and p53 mediate distinct and additive pathways to skeletal muscle atrophy during immobilization. Forced expression of ATF4 in muscle fibers is sufficient to induce atrophy, and ATF4-deficient fibers are partially resistant to immobilization-induced atrophy. ATF4 and p53 cooperate to induce p21 expression as a downstream effector of atrophy. |
Mouse muscle ATF4 and p53 KO/overexpression, limb immobilization model, genome-wide mRNA arrays, in vivo fiber size measurement |
American journal of physiology. Endocrinology and metabolism |
High |
24895282
|
| 2015 |
ATF4 activates heme oxygenase 1 (HO-1) expression through simultaneous activation with NRF2, both converging on the HO1 promoter. HO-1 upregulation by ATF4 ameliorates oxidative stress and protects cells from anoikis following matrix detachment. Reconstitution of ATF4 or HO-1 in ATF4-deficient cells rescues anoikis resistance and tumor lung colonization. |
ATF4-deficient human fibrosarcoma cells, HO-1 reconstitution, murine lung colonization model, ATF4/NRF2 co-activation analysis |
The Journal of clinical investigation |
High |
26011642
|
| 2016 |
KDM4C interacts with ATF4 and together they co-activate amino acid biosynthesis and transport genes. KDM4C activates ATF4 transcription and physically interacts with ATF4 to target serine pathway genes, removing repressive H3K9 trimethylation. |
Co-immunoprecipitation, ChIP, gene expression analysis, serine pathway reporter assays |
Cell reports |
Medium |
26774480
|
| 2016 |
ATF4 enhances IRE1α expression, increasing the XBP1 mRNA splicing ratio under ER stress, establishing a cross-talk mechanism where the PERK-ATF4 branch amplifies IRE1α-XBP1 signaling. |
Knockdown and overexpression of ATF4, measurement of IRE1α expression and XBP1 splicing ratio under ER stress |
Scientific reports |
Medium |
27052593
|
| 2017 |
ATF4 protein levels are regulated by PARylation: PARP-1 activation induces PARylation of ATF4 and reduces its binding to CRE sequences in vitro, while PARP inhibition increases ATF4 occupancy at the MKP-1 promoter (by ChIP-qPCR), leading to MKP-1 expression and JNK/p38 inactivation. |
PARylation assay in vitro, ChIP-qPCR, PARP inhibitor/siRNA knockdown, ATF4/MKP-1 functional pathway analysis |
Free radical biology & medicine |
Medium |
28457938
|
| 2017 |
FLT3-ITD promotes autophagy in AML cells through ATF4. Cellular levels of ATF4 are highly dependent on FLT3-ITD activity; ATF4 downregulation inhibits autophagy-dependent AML cell proliferation. |
FLT3 inhibition (pharmacological and genetic), ATF4 knockdown, autophagy assays, xenograft mouse model |
Oncogene |
Medium |
29059168
|
| 2018 |
ATF4 regulates a coordinated gene network in CD4+ T cells driving amino acid intake, mTORC1 activation, protein translation, and glutathione synthesis. ATF4-deficient CD4+ T cells have defects in redox homeostasis, proliferation, differentiation, and cytokine production. |
Atf4-deficient mice, CD4+ T cell functional assays, gene expression analysis, metabolic measurements |
Cell reports |
High |
29742431
|
| 2018 |
EIF1AX-A113splice mutation stabilizes the preinitiation complex, induces ATF4, and ATF4 in turn suppresses eIF2α phosphorylation, enabling increased global protein synthesis. ATF4 cooperates with RAS-stabilized c-MYC to induce amino acid transporters and sensitize mTOR to amino acid supply. |
Isogenic cell lines with EIF1AX mutations, mouse tumorigenesis models, protein synthesis measurement, epistasis experiments |
Cancer discovery |
High |
30305285
|
| 2019 |
PRMT1 methylates ATF4 at arginine 239, promoting ATF4 protein stability. The methylation-deficient ATF4 R239K mutant exacerbates ER stress and apoptosis. PRMT1 inhibition augments ER stress response via ATF4, while PRMT1 overexpression attenuates it in cardiomyocytes. |
ATF4 methylation-deficient mutant (R239K), PRMT1 overexpression/inhibition, ER stress assays in cardiomyocytes and PRMT1 null hearts |
Cell death & disease |
High |
31787756
|
| 2019 |
DHA (dihydroartemisinin) causes ER stress in glioma cells, activating PERK, which upregulates ATF4, which in turn induces HSPA5 expression. HSPA5 increases GPX4 activity, attenuating ferroptosis in a negative feedback loop. |
siRNA knockdown of PERK, ATF4, HSPA5; small molecule inhibitors; lipid peroxidation and ferroptosis assays in vitro and in vivo |
Journal of experimental & clinical cancer research |
High |
31519193
|
| 2019 |
ATF4 directly binds the LAMP3 gene promoter (verified by ChIP assay) and transcriptionally upregulates LAMP3 mRNA levels during the integrated stress response. LAMP3 regulation by ATF4 is confirmed by siRNA knockdown and exogenous ATF4 overexpression, plus dual-luciferase assay confirming the ATF4-binding site requirement. |
ChIP, siRNA knockdown of ATF4, exogenous ATF4 overexpression, dual-luciferase reporter assay |
The Journal of biological chemistry |
High |
32312748
|
| 2019 |
DISC1 physically interacts with ATF4 (bZIP transcription factor). Mutation of DISC1 disrupts normal DISC1-ATF4 interaction, resulting in excessive ATF4 nuclear localization and DNA binding. The crystal structure of the DISC1-ATF4 complex was solved, revealing the atomic basis of their interaction. |
Co-immunoprecipitation, crystal structure determination, CRISPR-mediated ATF4 heterozygous knockout in iPSC-derived neurons, ChIP-seq |
Molecular psychiatry |
High |
31444471
|
| 2020 |
ATF4 knockout significantly attenuates loperamide-induced autophagy and autophagic cell death in glioblastoma, and specifically mediates reticulophagy (selective ER degradation) through reticulophagy receptors RETREG1/FAM134B and TEX264. |
ATF4 knockout cells, electron microscopy, fluorescence microscopy for ER engulfment, reticulophagy receptor knockdown |
Autophagy |
Medium |
33111629
|
| 2020 |
ATF4, but not ATF5, is the key regulator of the mitochondrial unfolded protein response (UPRmt) in alveolar epithelial cells. ER stress (UPRER) leads to UPRmt in an ATF4-dependent manner, while mitochondrial stress does not activate UPRER. |
ATF4 knockdown, ER stress induction, mitochondrial stress induction, UPRmt marker analysis, inducible ATF4 expression in mouse alveolar epithelial cells in vivo |
American journal of respiratory cell and molecular biology |
High |
32551949
|
| 2020 |
ATF4 is induced by glucose deprivation and mediates CHOP-independent upregulation of TRAIL-R2 (DR5), leading to ligand-independent TRAIL receptor-mediated apoptosis. Ablation of TRAIL-R2, FADD, Bid, or caspase-8 attenuates this cell death. |
ATF4/CHOP knockdown, TRAIL receptor ablation, glucose deprivation model, apoptosis assays |
Molecular and cellular biology |
Medium |
28242652
|
| 2020 |
ATF4 protein stability is regulated by ubiquitin-proteasome-mediated proteolysis. Phosphorylation of ATF4 at serine-219 by cAMP-dependent protein kinase increases during chemically induced LTP and decreases thereafter; proteasome inhibition prevents ATF4 degradation. β-TrCP may act as the ubiquitin ligase. |
Chemical LTP induction in hippocampal neurons, proteasome inhibitor treatment, phospho-specific antibody analysis, β-TrCP investigation |
International journal of molecular sciences |
Medium |
33198401
|
| 2020 |
FAM175B interacts with ATF4 (co-localization by confocal microscopy and co-immunoprecipitation) and inhibits ubiquitin-dependent ATF4 degradation, elevating ATF4 protein levels and promoting CHOP-dependent apoptosis in esophageal squamous cell carcinoma. |
Co-IP, confocal colocalization, ubiquitination assay, siRNA knockdown, luciferase reporter |
Molecular oncology |
Medium |
30854784
|
| 2021 |
mTORC1 activates ATF4 through mechanisms distinct from canonical ISR/eIF2α phosphorylation, and this mTORC1-ATF4 pathway stimulates amino acid uptake, synthesis, tRNA charging, and cellular cystine uptake for glutathione synthesis. |
Insulin-stimulated mTORC1 activation, ATF4 KO MEFs and cancer cell lines, RNA-seq comparison of mTORC1-ATF4 vs ISR-ATF4 transcriptional programs, metabolic assays |
eLife |
High |
33646118
|
| 2021 |
Asparagine depletion (via ETC inhibition) increases ATF4 levels and impairs mTORC1. Exogenous asparagine restores ATF4 and mTORC1 activities, identifying asparagine as a signal communicating active mitochondrial respiration to ATF4 and mTORC1. |
ETC inhibitor (metformin), exogenous asparagine supplementation, asparaginase treatment, mouse tumor models, mTORC1 activity assays |
Cell metabolism |
High |
33609439
|
| 2021 |
Thbs1 binds and activates PERK, inducing downstream ATF4 expression and causing lethal autophagy-mediated cardiac atrophy. Deletion of PERK in Thbs1 transgenic mice blunts ATF4 induction and autophagy and largely corrects lethal cardiac atrophy. AAV9-mediated overexpression of PERK or ATF4 alone is sufficient to promote cardiac atrophy. |
Transgenic mice, PERK cardiac-specific KO, AAV9 gene transfer, autophagy markers, cardiac phenotype analysis |
Nature communications |
High |
34168130
|
| 2021 |
ATF4 selectively regulates heat nociception by interacting with TRPM3 and mediating its membrane trafficking via KIF17 in dorsal root ganglion neurons. Loss of ATF4 decreases TRPM3 current and KIF17-mediated trafficking, identifying a non-transcriptional function of ATF4. |
ATF4 KO in DRG neurons, co-immunoprecipitation of ATF4-TRPM3-KIF17, electrophysiology, membrane trafficking assays, heat sensitivity behavioral tests |
Nature communications |
High |
33658516
|
| 2021 |
ATF4 represses NRF1 transcriptional activity by binding to the NRF1 promoter region, thereby suppressing TFAM expression and impairing mitochondrial biogenesis and respiratory function in hepatocytes during alcohol-induced steatohepatitis. |
Hepatocyte-specific ATF4 KO mice, TFAM siRNA, ChIP (ATF4 binding to NRF1 promoter), mitochondrial function assays, liver-specific TFAM overexpression mice |
Gut |
High |
33177163
|
| 2021 |
YAP/TAZ sustain ATF4 protein stability, nuclear localization, and transcriptional activity in a TEAD-dependent manner. ATF4 cooperates with YAP/TAZ to induce SLC7A11 expression, maintaining glutathione homeostasis and enabling resistance to ferroptosis. |
shRNA screening, transcriptomic analysis, ATF4 localization studies, SLC7A11 reporter assays, ferroptosis assays |
EMBO molecular medicine |
Medium |
34664408
|
| 2021 |
ATF4 activates expression of NADPH-producing enzymes in both the pentose phosphate pathway and mitochondrial serine/glycine/folate metabolic pathway in cardiomyocytes. Cardiomyocyte-specific ATF4 KO exacerbates cardiomyopathy under pressure overload due to inability to induce these NADPH-generating enzymes; stable isotope tracing confirms ATF4 augments metabolic flux in these pathways. |
Cardiomyocyte-specific ATF4 KO mice, RNA-seq, metabolomics, stable isotope tracer experiments, transverse aortic constriction model |
Circulation research |
High |
35574856
|
| 2022 |
PRMT5 regulates ATF4 mRNA splicing; PRMT5 inhibition results in expression of intron-retaining, nuclear-detained ATF4 mRNA, reducing cytoplasmic spliced ATF4 transcript and protein levels, leading to decreased ATF4 target gene expression and increased oxidative stress. |
PRMT5 inhibitor treatment, RNA-seq, nuclear/cytoplasmic fractionation, ATF4 protein/mRNA measurement, oxidative stress assays |
Redox biology |
Medium |
35305370
|
| 2022 |
ATF4 and CTCF cooperate in adipogenesis by co-localizing at promoters of key adipogenic genes (Cebpd, PPARγ). ATF4 directly regulates CTCF expression and physically interacts with CTCF in differentiated adipocytes. ATF4 genome-wide binding was mapped by ChIP-seq. |
ChIP-seq, RNA-seq, Co-IP, CTCF deletion and overexpression, in vivo adipose tissue analysis |
Cell biology and toxicology |
Medium |
33950334
|
| 2022 |
In C. elegans, ATF-4 mediates longevity downstream of mTORC1 inhibition and translation inhibition by activating CTH-2 (transsulfuration enzyme) to increase hydrogen sulfide (H2S) production, which increases protein persulfidation as a protective modification. |
C. elegans genetic analysis, ATF-4 loss-of-function, H2S measurement, persulfidation analysis, lifespan assays |
Nature communications |
Medium |
35181679
|
| 2022 |
GADD34 positively regulates ATF4 activity in a feedback loop within the PERK pathway, while CHOP inhibits ATF4 activity, providing fine-tuning of the ER stress response. These feedback loops were identified by combined molecular biology and computational modeling. |
siRNA knockdown of GADD34/CHOP, ATF4 activity measurement, mathematical modeling, HEK293T cells under ER stress |
FEBS open bio |
Medium |
36097827
|
| 2023 |
ATF4 is an obligatory metabolic activator of NRF2: ATF4 increases NRF2 transcription and induces CHAC1 (glutathione-degrading enzyme), which is critically important for maintaining NRF2 activation. NRF2 in turn supports ATF4-induced stress response by increasing cystine uptake via xCT and upregulating thioredoxin pathways. |
ATF4 gain/loss-of-function, NRF2 reporter assays, CHAC1 knockdown, cystine uptake measurements, pathway analysis |
Cell reports |
Medium |
37410595
|
| 2023 |
ATF4 suppresses ferroptosis in hepatocytes by transcriptionally activating SLC7A11 (xCT), maintaining cystine uptake and glutathione synthesis. Hepatocyte-specific ATF4 ablation increases susceptibility to ferroptosis and accelerates HCC development; ectopic SLC7A11 expression reverses these effects. |
Hepatocyte-specific ATF4 KO mice, SLC7A11 reconstitution, ferroptosis inhibitor experiments, RNA-seq, diethylnitrosamine HCC model |
Journal of hepatology |
High |
36996941
|
| 2023 |
Thbs1 activates TGFβ-Smad2/3 signaling, which induces ATF4 expression in skeletal muscle. ATF4 in turn modulates the autophagy-lysosomal pathway and ubiquitin-proteasome system to facilitate muscle atrophy. Myofiber-specific deletion of Smad2/3 or ATF4 antagonizes Thbs1-induced muscle atrophy. |
Skeletal muscle-specific Thbs1 transgenic mice, Smad2/3 KO, ATF4 KO, denervation and caloric restriction atrophy models |
Cell reports |
High |
38678560
|
| 2023 |
Circular RNA circBtnl1 competes with Atf4 mRNA for binding to the RNA helicase Ddx3y, thereby impairing ATF4 mRNA stability and reducing ATF4 expression in intestinal stem cells. ATF4 activates Sox9 transcription by binding to its promoter, enhancing ISC self-renewal. |
circBtnl1 KO mice, RIP (RNA immunoprecipitation) for Ddx3y binding, Atf4 mRNA stability assay, ATF4 ChIP on Sox9 promoter, organoid self-renewal assays |
The EMBO journal |
High |
36715460
|
| 2020 |
ATF4 mediates mTORC1 re-suppression during prolonged leucine deprivation by transcriptionally upregulating both REDD1 and Sestrin2. In ATF4-deficient cells, neither REDD1 nor Sestrin2 is upregulated by leucine deprivation, and mTORC1 resuppression is absent. |
ATF4, REDD1, and/or Sestrin2 deficient MEFs, leucine deprivation time-course, mTORC1 activity measurement |
The Journal of nutrition |
High |
31875479
|
| 2017 |
DDX3 (RNA-binding protein) promotes ATF4 mRNA translation under ER stress by interacting with the eIF4F complex. DDX3 depletion prevents phospho-eIF2α-mediated ATF4 expression; luciferase and polyribosome assays confirm DDX3 acts at the translational level on ATF4 mRNA. |
DDX3 siRNA knockdown, luciferase reporter assay, polyribosome profiling, protein interaction assay (DDX3-eIF4F binding) |
Scientific reports |
Medium |
29062139
|
| 2019 |
LRPPRC deficiency in brown adipocytes causes mitochondrial ETC proteome imbalance and activates ATF4. ATF4 activation in brown adipocytes (by overexpression or low-protein diet) improves cold tolerance and systemic metabolism independently of UCP1 action. |
BA-specific Lrpprc KO, BA-specific ATF4 overexpression, low-protein diet model, Ucp1 KO mice, cold-tolerance tests, proteomics |
Cell reports |
Medium |
34551310
|
| 2012 |
FoxO1 co-localizes with ATF4 in the osteoblast nucleus, physically interacts with ATF4, and promotes ATF4 transcriptional activity. FoxO1 and ATF4 cooperate to suppress osteocalcin activity by up-regulating expression of the phosphatase catalyzing osteocalcin inactivation, affecting glucose homeostasis. |
Co-immunoprecipitation, colocalization studies, genetic epistasis (FoxO1/ATF4 compound knockout), glucose tolerance tests |
The Journal of biological chemistry |
Medium |
22298775
|
| 2019 |
Hop2 physically interacts with ATF4 via its Zip domain (identified by yeast two-hybrid, confirmed by deletional mapping) and enhances ATF4-dependent transcription. Hop2 deficiency in mice causes an osteopenic phenotype similar to ATF4-deficient mice; Atf4+/-:Hop2+/- compound heterozygotes display additive skeletal defects. |
Yeast two-hybrid, deletional domain mapping, Hop2 KO mice, compound heterozygous mice, osteocalcin/collagen expression |
Journal of bone and mineral research |
Medium |
31433867
|
| 2021 |
O-GlcNAcylation regulates ATF4 protein levels during the mitochondrial integrated stress response. OGT knockdown increases ATF4 protein and mRNA expression, and ATF4 occupancy at the ATF5 promoter is increased in brains of TMG-treated mice (demonstrated by ChIP). |
OGT knockdown, O-GlcNAcase inhibition (Thiamet-G), ChIP-qPCR, iPSC-derived neurons, AD mouse model |
Frontiers in aging neuroscience |
Medium |
38192280
|
| 2023 |
ATF4 is an essential mediator of skeletal muscle aging. Muscle-specific ATF4 KO mice are protected from age-related declines in strength, muscle quality, exercise capacity, and muscle mass at 22 months, with altered turnover of key structural/metabolic proteins. |
Muscle-specific ATF4 KO mice at 6 and 22 months, strength/exercise phenotyping, RNA-seq, proteomics |
GeroScience |
High |
37014538
|
| 2021 |
ATF4 protein levels in AML cells are regulated downstream of oncogenic FLT3-ITD signaling. BRAF ensures ATF4 induction through mTOR and eIF4B as downstream regulators during GCN2 activation, providing a non-canonical route to ATF4 that remains transiently active during BRAF inhibitor treatment. |
BRAF inhibitors, GCN2 activation, mTOR/eIF4B epistasis experiments, ATF4 protein measurement, synergistic killing assays |
iScience |
Medium |
32283529
|
| 2021 |
LNCR TINCR suppresses ATF4 translation by interacting with ATF4 mRNA and preventing its ribosome binding, establishing a non-canonical (eIF2α phosphorylation-independent) mechanism of ATF4 translational control in melanoma cells. |
TINCR knockdown/re-expression, polyribosome profiling, RNA immunoprecipitation of TINCR-ATF4 mRNA interaction, global protein synthesis measurement |
EMBO reports |
Medium |
33586907
|