| 2001 |
CREB-H (CREBH) is a liver-specific bZIP transcription factor localized to the ER via a transmembrane domain; deletion of the transmembrane domain causes nuclear translocation and increases transcriptional activity. Full-length GFP-CREBH localizes to perinuclear reticular structures, while the TM-deleted mutant localizes to the nucleus. CREBH binds CRE and box-B elements but not C/EBP, AP-1, or NF-κB elements. |
GFP fusion live imaging, gel mobility shift assay, GAL4 fusion transactivation assay, luciferase reporter assay |
Nucleic acids research |
High |
11353085
|
| 2005 |
CREB-H is activated by proteolytic cleavage that removes the C-terminal transmembrane domain, releasing a nuclear fragment. The active form binds to CRE, box-B, and ATF6-binding elements and activates the PEPCK-C promoter; this activation is further stimulated by cAMP and protein kinase A. |
Luciferase reporter assay, co-immunoprecipitation, promoter activation assay, cell proliferation assay |
Nucleic acids research |
Medium |
15800215
|
| 2006 |
Upon ER stress, CREBH is cleaved by site-1 protease (S1P) and site-2 protease (S2P) at the Golgi to liberate an N-terminal fragment that translocates to the nucleus and activates transcription of acute phase response genes SAP and CRP. Proinflammatory cytokines (and LPS) induce CREBH expression and trigger its cleavage in vivo. |
In vivo cleavage assay, siRNA knockdown, promoter-luciferase reporter, mouse LPS/cytokine challenge |
Cell |
High |
16469704
|
| 2007 |
CREB-H is subject to N-linked glycosylation and undergoes ERAD: it is retrotranslocated from the ER to the cytosol, deglycosylated, and degraded by the proteasome under basal conditions. Proteasome inhibition diverts CREB-H from ERAD into the cleavage/nuclear-transport pathway. A cytoplasmic determinant (ERM) mediates ER retention; deletion of this motif causes constitutive Golgi localization and cleavage. |
Subcellular fractionation, proteasome inhibitor treatment, glycosylation analysis, deletion mutagenesis, nuclear transport assay |
Traffic (Copenhagen, Denmark) |
High |
17875199
|
| 2009 |
PPARα directly binds to a PPRE in the CREBH promoter to induce CREBH expression in response to fatty acids and fasting. CREBH mRNA and nuclear protein are induced by fasting and suppressed by refeeding; this suppression is impaired in ob/ob mice. |
Luciferase reporter assay, EMSA, ChIP assay, promoter deletion analysis, PPARα agonist/antagonist treatment |
Biochemical and biophysical research communications |
High |
20006574
|
| 2010 |
Unlike ATF6, whose ER retention is mediated by lumenal BiP binding, CREB-H ER retention is controlled by a membrane-proximal cytoplasmic determinant (ERM) conserved in the CREB3 family but absent in ATF6. The lumenal tail of CREB-H neither binds BiP nor is required for ER retention or Golgi transport; ERM deletion causes constitutive Golgi localization and cleavage by S1P. |
Domain deletion and swap mutagenesis, co-IP for BiP binding, fluorescence microscopy, constitutive cleavage assay |
Traffic (Copenhagen, Denmark) |
High |
19883396
|
| 2010 |
N-linked glycosylation of CREB-H at three luminal sites is required for its efficient proteolytic activation. Unglycosylated CREB-H mutant (all three N-glycosylation sites abolished) is retained in an inactive ER form and fails to be cleaved or activate transcription in response to S1P stimulation. |
Site-directed mutagenesis of glycosylation sites, brefeldin A / KDEL-S1P stimulation, transcription reporter assay |
Journal of cell science |
High |
20356926
|
| 2010 |
CREBH regulates hepatic gluconeogenesis: it is induced by fasting or insulin-resistant state in a dexamethasone- and PGC-1α-dependent manner; the active nuclear form (CREBH-N) binds an enhancer in the PEPCK-C and G6Pase promoters distinct from the classical CREB/CRTC2 sites; hepatic CREBH knockdown reduces blood glucose in mice. |
Adenoviral overexpression, siRNA knockdown, ChIP assay, promoter-luciferase, glucose tolerance/blood glucose measurement in mice |
Cell metabolism |
High |
20374965
|
| 2011 |
CB1R activation by 2-AG induces CREBH gene expression via JNK phosphorylation and c-Jun binding to an AP-1 site in the CREBH promoter. CREBH mediates CB1R-stimulated hepatic gluconeogenic gene expression and glucose production; endogenous CREBH knockdown abolishes 2-AG-induced gluconeogenesis. |
ChIP assay, promoter mutagenesis-luciferase, siRNA knockdown, glucose production assay in primary hepatocytes |
The Journal of biological chemistry |
High |
21693703
|
| 2011 |
SMILE (small heterodimer partner-interacting leucine zipper protein) interacts with CREBH via its bZIP domain and represses CREBH-mediated transactivation. SMILE competes with PGC-1α coactivation of CREBH; curcumin induces SMILE through LKB1/AMPK signaling to selectively inhibit CREBH (not ATF6) target gene transcription. |
Co-IP, GST pulldown, ChIP, Gal4 fusion transactivation, siRNA knockdown, dominant-negative assay |
The Journal of biological chemistry |
High |
21994947
|
| 2012 |
CB1R agonist 2-AG induces Lipin1 gene expression in a CREBH-dependent manner; CREBH directly recruits to the Lipin1 promoter. This increases hepatic diacylglycerol levels and PKCε phosphorylation, thereby inhibiting insulin receptor signaling. |
ChIP assay, adenoviral CREBH overexpression/knockdown, DAG measurement, PKCε phosphorylation assay, insulin receptor signaling assay |
The Journal of biological chemistry |
Medium |
22989885
|
| 2013 |
CREB-H contains a unique ATB domain (absent in all other human bZIP factors) essential for transcriptional activity. CREB-H activates secretory pathway genes (SPGs) and stimulates secretion of specific cargo including apolipoproteins (ApoA-IV, ApoAI) in liver cells. |
Drosophila ATB domain complementation, deletion mutagenesis, transcriptomics, ELISA for secreted proteins |
Traffic (Copenhagen, Denmark) |
Medium |
23279168
|
| 2014 |
CREBH and PPARα interact to form a functional binary transcriptional complex that binds integrated CRE–PPRE composite elements in the FGF21 promoter; PPARα requires CREBH to exert its trans-activation effect on FGF21. CREBH and PPARα mutually regulate each other's expression. |
Co-IP, ChIP, luciferase reporter, gain- and loss-of-function in mice (adenoviral and genetic), FGF21 protein measurement |
Endocrinology |
High |
24424044
|
| 2014 |
CREBH directly activates Apoa4 (apolipoprotein A-IV) transcription via two tandem CREBH-binding sites (5'-CCACGTTG-3') in the promoter conserved between human and mouse; CREBH protein is constitutively processed to its active form in normal liver, with further increase during steatosis. |
ChIP, EMSA, luciferase reporter, CREBH-deficient mouse transcriptomics |
Journal of lipid research |
High |
24598141
|
| 2015 |
CREBH is acetylated at lysine 294 (K294) within its bZIP domain during fasting. PCAF mediates acetylation, SIRT1 mediates deacetylation. K294 acetylation is required for CREBH–PPARα interaction and synergistic transcriptional activation of lipid metabolic target genes; acetylation-deficient (K294R) mutant abolishes this interaction and causes hepatic steatosis in vivo. |
Site-directed mutagenesis, co-IP, luciferase reporter, adenoviral K294 mutant injection into mice, hepatic lipid measurement |
Molecular and cellular biology |
High |
26438600
|
| 2015 |
CREBH directly activates the Fsp27β (liver-specific isoform) promoter (not the Fsp27α/PPARγ-driven promoter). Fsp27β localizes to lipid droplets and suppresses lipolysis; CREBH-driven Fsp27β expression promotes lipid droplet enlargement and triglyceride accumulation in the liver. |
Promoter-luciferase assay, adenoviral overexpression/KO mouse, Oil-Red-O staining, lipid droplet imaging |
Hepatology (Baltimore, Md.) |
Medium |
25125366
|
| 2015 |
The active nuclear form of CREB-H (CREB-H-ΔTC) is degraded by the SCF(β-TrCP) E3 ubiquitin ligase via K48-linked polyubiquitination. β-TrCP binds a conserved phosphodegron motif SDSGIS in CREB-H-ΔTC; phosphorylation of this motif is required for β-TrCP recognition and subsequent proteasomal degradation. |
Co-IP, ubiquitination assay, site-directed mutagenesis, siRNA knockdown of β-TrCP, cycloheximide chase |
Scientific reports |
High |
27029215
|
| 2015 |
Phosphorylation of CREB-H within a serine-rich P-motif (around S87/S90) by CKII and GSK-3β targets CREB-H to the SCF(Fbw1a/β-TrCP) E3 ligase for proteasomal degradation. CREB-H directly interacts with Fbw1a in a phosphorylation-dependent manner; GSK-3 phosphorylation at adjacent serines primes subsequent CKII phosphorylation at S87/S90. |
In vitro kinase assay with CKII and GSK-3β, phosphospecific antibody, dominant-negative Cul1, Co-IP, site-directed mutagenesis |
Molecular biology of the cell |
High |
26108621
|
| 2016 |
CREBH proteolytic activation exhibits circadian rhythmicity controlled by the core clock oscillator BMAL1 and AKT/GSK3β signaling. GSK3β-mediated phosphorylation of CREBH modulates its association with COPII vesicle components to control ER-to-Golgi transport and subsequent proteolytic cleavage in a circadian manner. |
Circadian profiling of CREBH cleavage in mouse livers, BMAL1 KO, GSK3β inhibitor, COPII co-IP, phosphorylation assay |
Diabetes |
High |
27507854
|
| 2016 |
Hepatic CREB3L3 independently controls fatty acid oxidation and ketogenesis in addition to its role in activating PPARα in an auto-loop; double knockout (Creb3l3-/-/Ppara-/-) mice show further suppression of oxidation/ketogenesis genes beyond either single KO, indicating independent contributions. |
Creb3l3-/- and Ppara-/- single and double knockout mouse phenotyping on ketogenic diet and fasting; gene expression analysis |
Scientific reports |
High |
27982131
|
| 2016 |
CREBH directly activates Apoa1 (apoA-I) gene transcription, contributing to HDL cholesterol production. CREBH deficiency in Ldlr-/- mice decreases HDL and apoA-I and accelerates atherosclerosis. |
Luciferase reporter assay, CREBH-deficient/Ldlr-/- double KO mouse phenotyping, lipid profiling |
Arteriosclerosis, thrombosis, and vascular biology |
Medium |
27417587
|
| 2016 |
Intestinal CREBH directly regulates Npc1l1 (cholesterol transporter) promoter activity to suppress intestinal cholesterol absorption; CREBH transgenic (intestine) mice show reduced Npc1l1 expression and decreased plasma/hepatic cholesterol, while CREBH null mice show the opposite. |
Promoter-luciferase assay, CREBH intestine-specific transgenic and global KO mice, cholesterol absorption measurement, fecal cholesterol output |
Molecular metabolism |
High |
27818935
|
| 2017 |
CREBH maintains circadian glucose homeostasis by regulating glycogenolysis (via PYGL) and gluconeogenesis (via PCK1 and G6PC). CREBH interacts with PPARα, and K294 acetylation controls this interaction and synergistic gluconeogenic activity across the circadian cycle. |
CREBH KO mouse circadian phenotyping, Co-IP, adenoviral K294 acetylation-site mutants, glycogen measurement, blood glucose profiling |
Molecular and cellular biology |
High |
28461393
|
| 2017 |
TLR/MyD88-dependent signaling activates CREBH in liver upon LPS. TRAF6 (E3 ubiquitin ligase, TLR mediator) interacts with CREBH in a MyD88-dependent manner and mediates K63-linked ubiquitination of CREBH to facilitate its cleavage and activation. Active CREBH then directly activates ApoA4 expression to modulate HDL. |
Co-IP (CREBH–TRAF6, CREBH–MyD88), K63-ubiquitination assay, ChIP on ApoA4 promoter, TLR/MyD88 KO mice, HDL measurement |
The Journal of biological chemistry |
High |
27637329
|
| 2017 |
CREBH directly binds CREBH-recognition sites in the TGF-β2 promoter to induce TGF-β2 transcription in HCV-infected hepatocytes. Active nuclear CREBH accumulates during HCV infection, and CREBH silencing reduces TGF-β2 expression and fibrogenic responses in hepatic stellate cells. |
EMSA, ChIP, promoter-luciferase, siRNA knockdown, CREBH null mouse model, co-culture of HCV-infected cells with HSCs |
Hepatology (Baltimore, Md.) |
High |
28621467
|
| 2017 |
GSK-3 phosphorylation of the P-motif (S73–S90) of the full-length CREB-H precursor promotes ER retention and prevents ER-to-Golgi transport; mutation of these serines or pharmacological GSK-3 inhibition causes constitutive Golgi transport, proteolytic cleavage, and nuclear import. The same P-motif in the nuclear product is also phosphorylated by GSK-3/CKII to target CREB-H for SCF-mediated degradation, providing integrated control coupling ER-to-Golgi transport with nuclear stability. |
GSK-3 inhibitor treatment, serine-to-alanine mutagenesis, phosphospecific antibody, immunofluorescence, nuclear fractionation, transcriptional assay |
Molecular biology of the cell |
High |
28381424
|
| 2018 |
The Sel1L–HRD1 ERAD complex regulates ubiquitination and proteasomal turnover (and thus nuclear abundance) of CREBH in the liver. Liver-specific Sel1L deletion elevates CREBH nuclear levels and dramatically increases FGF21 expression; this is specifically through CREBH (not PPARα). An inverse correlation between Sel1L–HRD1 ERAD activity and CREBH–FGF21 levels was demonstrated across fasting-feeding cycles. |
Liver-specific Sel1L KO mice, ubiquitination assay, Co-IP, FGF21 measurement, CREBH protein stability assay |
The EMBO journal |
High |
30389665
|
| 2018 |
HRD1 E3 ligase mediates K48-linked polyubiquitin conjugation onto CREBH at lysine 294 (K294) for proteasomal degradation to downregulate FGF21 expression. Liver-specific HRD1 deletion phenocopies FGF21 gain-of-function mice (growth retardation, female infertility, circadian disruption). |
Liver-specific HRD1 KO mice, ubiquitin site-mapping at K294, ubiquitination assay, FGF21/CREBH protein turnover assay |
The EMBO journal |
High |
30389664
|
| 2019 |
CREBH activates expression of key autophagy genes (LC3, ATG7, ATG2b, ULK1) and lysosomal biogenesis genes in the liver upon starvation or energy-demanding circadian phases. CREBH deficiency reduces hepatic autophagic activity and increases lipid accumulation upon starvation. Under starvation, CREBH interacts with PPARα and PGC-1α to synergistically drive autophagy gene expression. |
CREBH KO mouse phenotyping, autophagy flux assay, Co-IP (CREBH–PPARα–PGC-1α), ChIP, gene expression analysis, adenoviral CREBH overexpression |
FASEB journal |
High |
30912978
|
| 2020 |
N-glycosylation of CREBH enhances its proteolytic activation and transcriptional capacity. N-glycosylation modulates CREBH's ability to activate PPARα and SCD-1 promoters via protein interactions. Deglycosylated CREBH shows impaired proteolysis (PA-induced cleavage blocked by tunicamycin), increased lipogenesis, and lipotoxicity in cells and NAFLD mouse models. |
Glycosylation site mutagenesis, GnT-V hyperglycosylation, tunicamycin treatment, Co-IP (CREBH–PPARα, CREBH–SCD-1), promoter-luciferase, lentivirus injection mouse model |
FASEB journal |
Medium |
32996649
|
| 2020 |
Full-length CREBH in the ER physically interacts with SREBP proteins and promotes formation of the SREBP-INSIG1 complex, retaining SREBP in the ER and preventing its proteolytic activation at the Golgi. CREBH deficiency leads to accumulation of nuclear SREBP, thereby de-repressing lipogenic/cholesterogenic gene expression. |
Co-IP (CREBH–SREBP–INSIG1), nuclear/cytoplasmic fractionation of SREBP, CREBH KO and liver/intestine-specific KO mouse lipid phenotyping |
Cellular and molecular gastroenterology and hepatology |
Medium |
33246135
|
| 2021 |
The HRD1/Sel1L ERAD complex mediates circadian polyubiquitination and degradation of CREBH protein across the circadian cycle; HRD1 and Sel1L expression itself is rhythmically driven by CREBH–PPARα–BMAL1. HRD1 liver-specific KO increases CREBH levels, altering circadian TG, FA, and glucose profiles; suppressing CREBH overproduction in HRD1 LKO mice rescues diurnal lipid profiles. |
Liver-specific HRD1 KO and CREBH KO mice, circadian metabolite profiling, ubiquitination assay, Co-IP (CREBH–PPARα–BMAL1), rescue by CREBH suppression in HRD1 LKO |
Molecular metabolism |
High |
33592335
|
| 2023 |
The C-terminal fragment of CREBH (CREBH-C), derived from cleavage of full-length CREBH, is secreted as a hepatokine in response to fasting or hepatic stress. CaMKII-mediated phosphorylation of CREBH-C is required for its efficient secretion via exocytosis. Secreted CREBH-C blocks formation of the ANGPTL3–ANGPTL8 inhibitory complex, thereby increasing LPL activity in plasma and metabolic tissues, promoting triglyceride clearance. |
CREBH-C detection in conditioned media and plasma, CaMKII inhibitor and kinase assay, ANGPTL3–ANGPTL8 Co-IP in presence of CREBH-C, LPL activity assay in vivo, CREBH-C administration to high-fat diet mice |
Science signaling |
High |
36649378
|
| 2021 |
CREBH normalizes diabetic dyslipidemia via an APOE-dependent mechanism: active CREBH enriches APOE on TRL remnants and depletes APOC3, promoting hepatic clearance of remnant lipoproteins. This mechanism is independent of LPL (confirmed in LPL-deficient mice) but requires APOE (fails in Apoe-/- mice). |
LPL-deficient and Apoe-/- mouse genetic models with CREBH adenoviral expression, lipoprotein particle profiling, apolipoprotein composition analysis |
The Journal of clinical investigation |
High |
34491909
|
| 2022 |
CREBH promotes SIRT3 expression, which deacetylates MnSOD to reduce mitochondrial oxidative stress and inhibits NLRP3 inflammasome activation. CREBH overexpression alleviates mitochondrial oxidative stress in NASH; SIRT3 suppression abolishes this protective effect; CREBH KO mice show elevated oxidative stress and NASH susceptibility. |
Co-IP (SIRT3–CPT2, SIRT3–ACADL interaction), acetylation assay of MnSOD, NLRP3 inflammasome activation measurement, CREBH KO and OE mouse/cell models |
Free radical biology & medicine |
Medium |
35926687
|
| 2024 |
CREBH is enriched in and required for hepatic Mitochondria-Associated Membrane (MAM) expansion under energy demands. Activated CREBH, cooperating with PPARα, drives expression of UPRmt regulators ATF5 and ATF4. CREBH deficiency causes accumulation of mitochondrial unfolded proteins, decreased mitochondrial membrane potential, and shifts energy metabolism from fatty acid oxidation toward carbohydrate oxidation. |
MAM fractionation, CREBH KO mouse phenotyping, mitochondrial membrane potential assay, mitochondrial unfolded protein detection, Co-IP (CREBH–PPARα), gene expression analysis, metabolic flux measurement |
Proceedings of the National Academy of Sciences |
High |
39589874
|
| 2015 |
TNFα induces CREBH expression via NF-κB signaling in osteoblasts; active CREBH increases Smurf1 expression leading to ubiquitin-dependent degradation of Smad1, thereby inhibiting BMP2-induced osteoblast differentiation. CREBH knockdown attenuates TNFα-mediated Smad1 degradation and rescues osteoblast differentiation. |
Co-IP (Smad1–Smurf1), siRNA knockdown, adenoviral CREBH overexpression, ALP/osteocalcin assays, ectopic bone formation in vivo |
The Journal of biological chemistry |
Medium |
25873397
|
| 2013 |
Hepatic CREBH is a positive transcriptional regulator of CYP2B family genes (e.g., CYP2B10); CREBH ectopic expression increases CYP2B10 promoter activity, and CREBH-deficient mice show severely impaired CYP2B induction and resistance to sulpyrine-induced fatal shock. Reintroduction of CYP2B into CREBH-deficient liver restores sulpyrine susceptibility. |
Promoter-luciferase assay, CREBH KO mouse, in vivo knockdown (siRNA), adenoviral CYP2B rescue |
PloS one |
Medium |
23409047
|
| 2025 |
CREB-H induces expression of Cgref1 (a secreted hepatokine) via direct transcriptional regulation. Secreted Cgref1 suppresses insulin signaling and glucose uptake in epididymal white adipose tissue, creating eWAT insulin resistance that in turn promotes hepatic de novo lipogenesis. |
Microarray of Creb3l3-/- mice, Cgref1 KO mice, transcriptomic/metabolomic/lipidomic analysis, gain/loss-of-function in hepatocytes, insulin signaling assay in eWAT |
International journal of biological sciences |
Medium |
40303310
|
| 2025 |
In zebrafish creb3l3 double mutants (lacking both orthologs), key creb3l3 target genes apoC2 and apoA4 are downregulated in intestines; mutants show impaired lipoprotein turnover (not reduced total lipoprotein production) and increased enterocyte lipid droplet size and number, establishing creb3l3 as a regulator of postprandial intestinal lipid flux balancing storage vs. secretion. |
Zebrafish genetic KO (CRISPR), lipoprotein reporter lines, histological lipid droplet analysis, gene expression analysis |
Journal of lipid research |
Medium |
40449732
|
| 2023 |
CREBH promotes autophagic flux by transcriptionally repressing Coronin 1a (Coro1a), a gene that inhibits autophagosome-lysosome fusion. Overexpression of Coro1a in hepatocytes blocks autophagic flux; CREBH deficiency aggravates dysfunctional autophagy and liver injury in NASH. |
Autophagic flux assay (LC3-II, p62), lysosomal marker (LAMP1) imaging, CREBH KO in NASH mouse models, Coro1a promoter reporter, adenoviral Coro1a overexpression |
Biochimica et biophysica acta. Molecular basis of disease |
Medium |
37837948
|