| 1997 |
Human CIRP (CIRBP) encodes an 18-kDa protein with an N-terminal RNA-binding domain and a C-terminal Gly-rich domain; its mRNA and protein are upregulated within 12 h of temperature downshift from 37°C to 32°C in multiple human cell lines, establishing it as a cold-shock protein. |
cDNA cloning, Northern blot, Western blot, temperature-shift experiments in multiple cell lines |
Gene |
High |
9434172
|
| 1998 |
Cirp protein is localized to the nucleus of neurons and is diurnally regulated in the suprachiasmatic nucleus and cerebral cortex in a light-dependent manner, implicating it in biological rhythm regulation. |
Northern blot, immunohistochemistry, constant-darkness controls |
Biochemical and biophysical research communications |
Medium |
9571190
|
| 1998 |
CIRP expression is constitutively high in male germ cells (primarily in nuclei of primary spermatocytes) and is downregulated within 6 hours by elevated temperature (experimental cryptorchidism or scrotal heating), linking CIRP to temperature-dependent regulation during spermatogenesis. |
Northern blot, immunohistochemistry, experimental cryptorchidism mouse model |
The American journal of pathology |
High |
9422546
|
| 1999 |
H2O2 dose-dependently inhibits cold-induced CIRP mRNA expression in PC12 cells, indicating that reactive oxygen species suppress CIRP induction; ischemia decreases CIRP mRNA specifically in hippocampus but not cortex. |
In situ hybridization, Northern blot, PC12 cell culture with H2O2, rat forebrain ischemia model |
Free radical biology & medicine |
Medium |
10641716
|
| 2004 |
CIRP (and RBM3) are transcriptionally upregulated by hypoxia via a HIF-1-independent, mitochondria-independent mechanism, as demonstrated in HIF-1α-deficient and HIF-1β-deficient cell lines; regulation occurs at the level of gene transcription (confirmed by actinomycin-D block and nuclear run-on assays). |
HIF-1-deficient cell lines (Z-33, Hepa-1 c4), actinomycin-D chase, in vitro nuclear run-on assay, Northern blot |
Journal of cell science |
High |
15075239
|
| 2006 |
Cirp protects cells from TNF-α–induced apoptosis by activating the ERK signaling pathway: Cirp transduction into Cirp-deficient fibroblasts increased phospho-ERK and suppressed caspase-8 activation; ERK inhibitor PD98059 reversed Cirp's cytoprotective effect. |
Cirp transduction into knockout fibroblasts, Western blot for p-ERK, caspase-8 assay, ERK inhibitor (PD98059) |
Biochimica et biophysica acta |
High |
16569452
|
| 2009 |
Cold-induced CIRP expression is controlled by an octanucleotide mild-cold responsive element (MCRE, 5'-TCCCCGCC-3') in the cirp promoter that is bound by the transcription factor Sp1; nuclear Sp1 enrichment at the CIRP regulatory region increases at 32°C, and Sp1 overexpression or knockdown bidirectionally regulates CIRP expression. |
Reporter gene assay, EMSA, chromatin immunoprecipitation, Sp1 overexpression/knockdown in multiple cell lines |
BMC biotechnology |
High |
23046908
|
| 2009 |
CIRP expression is controlled by alternative 5'-UTR transcripts with different transcription start sites; the major 37°C transcript does not encode full-length CIRP ORF, whereas two major 32°C transcripts do; the longest 32°C transcript exhibits IRES-like activity. |
5'-RACE, reporter gene (IRES activity), Northern blot, transcript stability assays in NIH-3T3 cells |
RNA (New York, N.Y.) |
High |
19398494
|
| 2012 |
Cirp directly binds to Dyrk1b/Mirk, inhibiting Dyrk1b's binding to p27 (resulting in decreased p27 phosphorylation and destabilization of p27) and inhibiting Dyrk1b-mediated phosphorylation of cyclin D1 (resulting in cyclin D1 stabilization), thereby promoting cell-cycle progression from G0/G1 to S phase in undifferentiated spermatogonia. |
Cirp-KO mice, co-immunoprecipitation, GST pulldown, immunolocalization, spermatogonial cell line knockdown, flow cytometry (cell cycle), busulfan recovery assay |
Proceedings of the National Academy of Sciences of the United States of America |
High |
22711815
|
| 2012 |
CIRP binds to mRNAs in the mouse testis through a (Un)n≥2 recognition sequence and increases the stability of bound mRNAs; target mRNAs are enriched for translation regulation, antioxidant activity, and reproduction functions. |
RIP-Chip (RNA-binding protein immunoprecipitation-microarray), biotin pull-down assay |
FEBS letters |
Medium |
22819822
|
| 2013 |
CIRP is released from macrophages into the extracellular space under hypoxic stress (translocating from nucleus to cytosol first), and extracellular CIRP acts as a DAMP that stimulates TNF-α and HMGB1 release from macrophages via the TLR4-MD2 complex; surface plasmon resonance confirmed CIRP binding to TLR4-MD2, TLR4, and MD2 individually, with residues 106-125 binding MD2 with high affinity. |
Surface plasmon resonance, macrophage stimulation assay, CIRP-KO mice (hemorrhage/sepsis model), antisera blockade, recombinant CIRP injection in vivo |
Nature medicine |
High |
24097189
|
| 2013 |
Cirp deficiency in mice reduces susceptibility to dextran sodium sulfate-induced intestinal inflammation and tumorigenesis, with decreased TNF-α, IL-23, Bcl-2, Bcl-xL, and Sox2 in colonic lamina propria cells; bone marrow transplant experiments show Cirp in hematopoietic cells drives this effect. |
Cirp-KO mice, DSS/AOM-DSS colitis-associated cancer model, bone marrow transplantation, qPCR/Western blot |
Cancer research |
High |
25187386
|
| 2013 |
TNF and TGF-β, but not IL-1β, IL-6, IFNα or IFNγ, impair Cirbp expression in fibroblasts and neuronal cells; Cirbp depletion increases susceptibility to TNF-mediated inhibition of high-amplitude clock gene expression, placing CIRBP downstream of cytokine signaling in circadian rhythm regulation. |
Cirbp knockdown in fibroblasts/neuronal cells, cytokine treatment, circadian reporter assays |
The Journal of biological chemistry |
Medium |
24337574
|
| 2015 |
CIRP/hnRNP A18 associates with the active telomerase complex by directly binding the RNA subunit TERC, regulates Cajal body localization of telomerase, and controls TERT mRNA levels; CIRP inhibition via CRISPR-Cas9 or siRNA reduces telomerase activity and shortens telomeres. |
IP-MS, co-immunoprecipitation, CRISPR-Cas9 KO, siRNA knockdown, telomerase activity assay, telomere length measurement, Cajal body localization by fluorescence microscopy |
Nucleic acids research |
High |
26673712
|
| 2015 |
CIRP inhibits DNA damage-induced apoptosis by reducing p53 protein levels: CIRP knockdown increases p53, upregulating pro-apoptotic and downregulating anti-apoptotic genes; CIRP overexpression has the opposite effect. |
CIRP overexpression and knockdown, etoposide-induced DNA damage, Western blot for p53, qPCR for apoptosis genes |
Biochemical and biophysical research communications |
Medium |
26188505
|
| 2016 |
Temperature-dependent accumulation of Cirbp mRNA is controlled primarily by regulation of splicing efficiency (fraction of pre-mRNA processed into mature mRNA), not transcription rate, as shown by genome-wide 'approach to steady-state' kinetics in NIH3T3 cells exposed to simulated body temperature cycles. |
Genome-wide approach-to-steady-state mRNA kinetics, temperature oscillation experiments in NIH3T3 cells, mathematical modeling |
Genes & development |
High |
27633015
|
| 2017 |
CIRP induction requires the ion channel TRPV4: cold, DNA damage, hypoxia, cycloheximide, and hypotonicity all induce CIRP (and RBM3 and SRSF5) expression in a TRPV4-dependent but ion-channel-activity-independent manner. |
TRPV4 knockdown/inhibition experiments, multiple stress stimuli, Western blot and qPCR |
Scientific reports |
Medium |
28536481
|
| 2017 |
CIRP induces lung ER stress markers (BiP, pIRE1α, sXBP1, CHOP, cleaved caspase-12) through TLR4 activation, causing sepsis-associated acute lung injury; this is absent in TLR4-KO mice injected with recombinant CIRP. |
CIRP-KO and TLR4-KO mice, CLP sepsis model, recombinant CIRP injection, Western blot for ER stress markers |
Scientific reports |
High |
28128330
|
| 2018 |
CIRP selectively binds the 5' UTR of p27Kip1 mRNA and stimulates its translation; during mild hypothermia, CIRP induction correlates with increased p27Kip1 protein accumulation and reduced proliferation; CIRP knockdown prevents cold-induced p27Kip1 translation, and p27Kip1-KO MEFs fail to reduce proliferation in response to cold. |
RNA binding assay (RIP), luciferase reporter for 5'UTR, shRNA CIRP knockdown, p27-KO MEFs, cold-shift experiments, Western blot |
Nucleic acids research |
High |
29361038
|
| 2018 |
CIRBP binds the 3'-UTR of HIF-1α mRNA in bladder cancer cells, increasing HIF-1α mRNA stability and thereby inducing HIF-1α protein expression to promote cancer progression. |
RNA immunoprecipitation, 3'-UTR reporter assay, CIRBP knockdown/overexpression, mRNA stability assay |
Cell death & disease |
Medium |
30315244
|
| 2018 |
eCIRP-derived peptide C23 competitively inhibits CIRP's binding to TLR4 and blocks NF-κB nuclear translocation and IκBα degradation in macrophages, reducing sepsis-induced organ injury and improving survival in CLP mice. |
Macrophage TNF-α assay, NF-κB nuclear translocation assay, IκBα Western blot, CLP mouse model, dose-response |
Scientific reports |
High |
29434211
|
| 2018 |
CIRBP directly binds to pre-miR-329 (but not pri-miR-329) in ischemic muscle tissue, playing a role in posttranscriptional regulation of 14q32 microRNAs after hindlimb ischemia. |
RNA pull-down SILAC mass spectrometry, RBP immunoprecipitation, CRISPR/Cas9 HADHB-/- cells |
Molecular therapy. Nucleic acids |
Medium |
30665182
|
| 2019 |
Chronic hypoxia causes hypermethylation of the Cirbp promoter region in cardiomyocytes, suppressing CIRBP expression and its response to cold stress; CIRBP is required for hypothermic cardioprotection by maintaining ubiquinone (CoQ10) biosynthesis. |
Cirp-KO and transgenic rats, CPB model, methylation analysis, cardiac proteomics, CoQ10 measurement, neonatal rat cardiomyocytes, patient specimens |
Science translational medicine |
High |
31019028
|
| 2020 |
Both Transportin-1 (TNPO1) and Transportin-3 (TNPO3) mediate nuclear import of CIRBP via two nonclassical NLSs: TNPO1 recognizes an RG/RGG-rich region, and TNPO3 recognizes an RSY-rich region; these interactions regulate CIRBP nuclear localization, phase separation, and stress granule recruitment. |
Biophysical binding assays (NMR, ITC), mutagenesis of NLS regions, cell imaging for nuclear localization and stress granule recruitment |
Proceedings of the National Academy of Sciences of the United States of America |
High |
32234784
|
| 2020 |
eCIRP is a novel endogenous ligand of TREM-1; surface plasmon resonance showed strong binding affinity, and FRET confirmed interaction in macrophages; TREM-1 siRNA, decoy peptide LP17, or TREM-1-/- mice dramatically reduced eCIRP-induced inflammation. |
Surface plasmon resonance, FRET, TREM-1-/- mice, siRNA knockdown, decoy peptide LP17, macrophage stimulation |
JCI insight |
High |
32027618
|
| 2020 |
eCIRP induces macrophage endotoxin tolerance via IL-6R-mediated STAT3 activation: Biacore, FRET, and co-localization assays confirmed strong eCIRP-IL-6R binding; IL-6R blockade reversed eCIRP-induced STAT3 phosphorylation and M2 polarization. |
Biacore (SPR), FRET, immunostaining co-localization, STAT3 inhibitor (Stattic), IL-6R neutralizing antibody, macrophage polarization assay |
JCI insight |
High |
32027619
|
| 2020 |
eCIRP generates ICAM-1+ neutrophils via TREM-1 signaling; these ICAM-1+ neutrophils use Rho GTPase to promote NETosis; ICAM-1 blockade reduces Rho activation and NET formation. |
TREM-1-/- mice and BMDN, rmCIRP treatment, ICAM-1-/- neutrophils, Rho activation assay, PAD4 inhibitor, flow cytometry |
FASEB journal |
High |
32506691
|
| 2021 |
CIRBP interacts with ELAVL1 (verified by co-immunoprecipitation and fluorescence colocalization) and promotes ELAVL1-dependent ferritinophagy activation, leading to ferroptosis in renal tubular epithelial cells during ischemia-reperfusion injury. |
Co-immunoprecipitation, fluorescence colocalization, siRNA knockdown (CIRBP, ELAVL1), autophagy inhibitor, in vivo anti-CIRBP antibody treatment |
Journal of cellular and molecular medicine |
Medium |
34114349
|
| 2021 |
CIRBP directly binds the 3'- and 5'-UTRs of CTNNB1 mRNA (β-catenin), enhancing mRNA stability, translation, and IRES-mediated protein synthesis, thereby activating Wnt/β-catenin signaling and downstream oncogenes in non-small cell lung cancer cells. |
RNA immunoprecipitation, biotin pull-down, mRNA decay analysis, luciferase reporter (3'UTR and IRES), CIRP overexpression/knockdown |
Journal of experimental & clinical cancer research : CR |
High |
34465343
|
| 2021 |
SRPK1 phosphorylates the RG/RGG region of CIRBP in vitro at two novel sites; phosphorylation impairs CIRBP's liquid-liquid phase separation and TNPO1 binding in vitro, and interferes with stress granule association in cells; arginine methylation of the RG/RGG region regulates SRPK1-mediated phosphorylation. |
In vitro kinase assay (SRPK1), biophysical LLPS assay, TNPO1 binding assay, SG recruitment in cells, methylation-phosphorylation interplay |
Frontiers in molecular biosciences |
High |
34738012
|
| 2021 |
eCIRP induces macrophage extracellular trap (MET) formation through caspase-1-dependent activation of gasdermin D (GSDMD); caspase-1 and GSDMD inhibitors block rmCIRP-induced MET formation. |
Time-lapse fluorescence microscopy, colorimetry, ELISA for extracellular DNA/citrullinated histone/MPO, Western blot for cleaved GSDMD and caspase-1, pharmacological inhibitors |
Frontiers in immunology |
High |
35003095
|
| 2021 |
eCIRP decreases GPX4 expression and increases lipid ROS in macrophages via TLR4, inducing ferroptosis; GPX4 suppression and lipid peroxidation are attenuated in TLR4-/- macrophages and in CIRP-/- septic mice; ferroptosis inhibitor ferrostatin-1 rescues eCIRP-induced cell death. |
TLR4-/- macrophages, CIRP-/- mice (CLP model), rmCIRP stimulation, lipid ROS assay, ferrostatin-1 rescue, Western blot for GPX4 |
Frontiers in immunology |
High |
35844517
|
| 2021 |
eCIRP activates STING through TLR4/MyD88/TRIF pathways, driving TBK1-IRF3 phosphorylation and type I IFN production, exacerbating inflammation after hemorrhagic shock; STING-/- mice are protected from eCIRP-induced type I IFN responses. |
STING-/-, TLR4-/-, MyD88-/-, TRIF-/- macrophages and mice, rmCIRP injection, hemorrhagic shock model, Western blot for pTBK1/pIRF3 |
JCI insight |
High |
34291735
|
| 2021 |
Cirbp directly binds the 3'UTR of Atp5g3 mRNA and sustains protein levels of mitochondrial respiratory chain complexes II (SDHB) and IV (MT-CO1), maintaining ATP biogenesis under hypoxia; Cirbp knockdown impairs mitochondrial homeostasis and energy production. |
RNA binding assay (3'UTR), Western blot for respiratory chain complexes, ATP measurement, Cirbp knockdown |
The Science of the total environment |
Medium |
34715218
|
| 2021 |
Cirbp post-transcriptionally regulates PSD95 by binding to the PSD95 mRNA 3'-UTR region; Cirbp overexpression in mouse hippocampus rescues hypobaric hypoxia-induced PSD95 downregulation, dendritic spine morphology changes, and cognitive deficits. |
3'UTR binding assay, Cirbp hippocampal overexpression (viral), behavioral testing, dendritic spine morphology |
Molecular brain |
Medium |
34419133
|
| 2021 |
eCIRP impairs macrophage bacterial phagocytosis by inducing STAT3 phosphorylation, which promotes STAT3-βPIX complex formation; this prevents βPIX from activating Rac1, thereby reducing ARP2 and p-cofilin expression and impairing actin remodeling-dependent phagocytosis. STAT3 inhibition with stattic restores phagocytosis. |
Co-immunoprecipitation (STAT3-βPIX complex), Rac1 activation assay, STAT3 inhibitor (stattic), Western blot for ARP2/p-cofilin, CIRP-/- mice, in vivo bacterial load measurement |
Cellular & molecular immunology |
High |
36471113
|
| 2021 |
eCIRP induces inflammation in alveolar type II (ATII) cells via TREM-1: rmCIRP increases TREM-1 expression in ATII cells; TREM-1-/- ATII cells produce less IL-6 and CXCL2 after rmCIRP stimulation; TREM-1 antagonist peptides M3 and LP17 attenuate the response. |
Primary ATII cell isolation, TREM-1-/- mice, flow cytometry, ELISA, TREM-1 antagonist peptides |
Frontiers in cell and developmental biology |
Medium |
32984356
|
| 2021 |
CIRBP directly binds OGFR mRNA and represses OGFR expression by reducing mRNA stability; CIRBP-mediated suppression of the OGF/OGFR axis protects cardiomyocytes against doxorubicin-induced apoptosis and cardiac dysfunction. |
RIP for CIRBP-OGFR mRNA interaction, mRNA stability assay, CIRBP-KO/OE in vivo (mouse myocardium delivery), OGFR-specific antagonist NTX rescue |
International journal of biological sciences |
High |
35541895
|
| 2021 |
eCIRP activates Cdk5 via the IL-6Rα/STAT3/p25 pathway in neurons; surface plasmon resonance showed eCIRP-derived peptide C23 blocks eCIRP binding to IL-6Rα, and C23 reverses eCIRP-induced STAT3 phosphorylation and p25 levels. |
Surface plasmon resonance, N2a cell stimulation, STAT3 phosphorylation assay, p25 Western blot, dose-response |
Molecular neurobiology |
Medium |
33783711
|
| 2022 |
CIRBP directly binds p53 RNA (RIP), and cold induction of CIRBP modulates p53 and GPX4 expression to promote ferroptosis in pancreatic cancer cells; cold treatment increases Fe2+ accumulation and ROS while inhibiting GPX4. |
RIP (CIRBP antibody enriches p53 RNA), Western blot for p53/GPX4/DPP4/NOX1, Fe2+ and ROS assays, ferroptosis inhibitor rescue |
Journal of immunology research |
Medium |
36061308
|
| 2023 |
Extracellular CIRP binds poly(A) RNA tails through its RNA-recognition motif; a synthetic stabilized poly(A) mimic (A12) selectively competes with this interaction and prevents eCIRP's binding to TLR4, reducing NF-κB and MAPK activation in macrophages. |
In vitro binding assay (A12 vs. eCIRP RRM), macrophage NF-κB/MAPK activation, in vivo CLP model, cytokine ELISA |
Journal of immunology (Baltimore, Md. : 1950) |
High |
37585248
|
| 2023 |
eCIRP triggers Ca2+ release from ER stores via IL-6Rα/PLC/IP3 pathway in neurons, activating cytosolic calpain 1, which cleaves p35 to p25 and thereby hyperactivates Cdk5; IP3R inhibitors, PLC inhibitor, and IL-6Rα neutralization each block this cascade. |
Cytosolic Ca2+ imaging (HT22 cells), calpain activity assay, IP3R inhibitors (2-APB, X-C), PLC inhibitor (U73122), IL-6Rα antibody, calpain 1 siRNA, p25 Western blot |
Molecular neurobiology |
High |
36853429
|
| 2024 |
Lactate-induced lactylation of CIRP in macrophages promotes its release; internalized eCIRP in pulmonary vascular endothelial cells (via TLR4-mediated endocytosis) competes with TRIM32 for ZBP1 binding, blocking TRIM32-mediated proteasomal degradation of ZBP1 and thereby stabilizing ZBP1 to drive RIPK3-dependent PANoptosis. |
CLP sepsis model in WT, Casp8-/-, Ripk3-/-, Zbp1-/- mice; CIRP lactylation assay; co-immunoprecipitation (eCIRP-ZBP1, ZBP1-TRIM32); TLR4 endocytosis tracking; Western blot for ZBP1/RIPK3 |
Military Medical Research |
High |
39465383
|
| 2024 |
CIRBP deficiency in aged donor hearts attenuates hypothermic cardioprotection during transplantation by reducing DHODH expression, compromising DHODH-mediated ubiquinone reduction, and thereby triggering ferroptosis (lipid peroxidation) in cardiomyocytes. |
Cirbp-KO and aged rat heart transplantation model, RNA-Seq, cardiac proteomics, DHODH activity/ubiquinone measurement, ferroptosis markers, Cirbp overexpression rescue |
The Journal of clinical investigation |
High |
38690728
|
| 2024 |
Decreased CIRP binding to GluR1 (AMPA receptor subunit) mRNA under hypobaric hypoxia reduces GluR1 protein stability on the neuronal membrane, leading to decreased synaptic density, dendritic spine loss, and memory impairment; Tat-C16 peptide (CIRP residues 110-125) rescues GluR1 surface expression and cognitive function. |
CIRP-KO mice, hypobaric hypoxia model, RIP/binding assay (CIRP-GluR1 mRNA), membrane fractionation, behavioral testing, Tat-C16 peptide rescue |
CNS neuroscience & therapeutics |
Medium |
39315498
|
| 2021 |
eCIRP induces inflammation in pulmonary fibroblasts via TLR4 and accessory proteins MD2 and MyD88 (TLR4-dependent manner), contributing to the inflammatory-to-fibrotic transition in bleomycin-induced pulmonary fibrosis. |
TLR4 knockdown in fibroblasts, transcriptome analysis, bleomycin lung fibrosis model, gene expression profiling at multiple time points |
Frontiers in immunology |
Medium |
34367191
|
| 2021 |
CIRBP knockdown in pancreatic cancer cells promotes tumour malignancy and gemcitabine resistance by upregulating DYRK1B expression; CIRBP-mediated suppression of DYRK1B increases ERK/p38 activity ratio. |
CIRBP siRNA knockdown in PANC-1/SW1990 cells, DYRK1B Western blot, ERK/p38 activity assay, gemcitabine sensitivity, in vivo tumor growth |
Frontiers in cell and developmental biology |
Medium |
34490236
|
| 2018 |
TGF-β2 and TGF-β3 (but not TGF-β1) downregulate CIRBP mRNA and protein expression in germ cells both in vivo and in vitro; TGF-β antagonist administration in heat-stressed mouse testis attenuates CIRBP downregulation and histological damage. |
Testicular hyperthermia mouse model, TGF-β antagonist injection, GC2-spd cell TGF-β treatment, qPCR and Western blot |
Andrology |
Medium |
30461215
|