IER3 Antibody

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Description

Introduction to IER3 Antibody

IER3 (Immediate Early Response 3) antibodies are specialized immunological tools designed to detect and quantify the IER3 protein, a stress-inducible regulator involved in apoptosis, proliferation, and cellular stress responses . Also known as IEX-1, this protein is encoded by the IER3 gene (Entrez Gene ID: 8870) and is widely expressed across tissues, including the liver, pancreas, and hematopoietic systems . IER3 antibodies are critical for studying its role in cancer progression, autophagy, and signaling pathways such as ERK and AKT/mTOR .

Top Validated IER3 Antibodies

The following table summarizes widely used IER3 antibodies, validated across platforms like Western blot (WB), immunohistochemistry (IHC), and flow cytometry (FC):

ProviderCatalog No.ClonalityReactivityApplicationsReferences
antibodies-onlineABIN952818PolyclonalHuman, MouseWB, ICC, IHC, FC2
Novus BiologicalsNBP1-76802PolyclonalHumanWB, ELISA, ICC, IHC1
GeneTexGTX31315PolyclonalHumanWB, ELISA, ICC, IHCSupported
Abcamab65152PolyclonalHuman, MouseWB, IHC-P, ICC/IF7 publications
AbnovaPAB13000PolyclonalHuman, MouseWB (2–4 µg/mL), IHC (2.5 µg/mL)Validated

Sources:

Cancer Biology

  • Hepatocellular Carcinoma (HCC): IER3 is upregulated in HCC tissues and correlates with poor prognosis (HR = 1.30, 95% CI 1.03–1.64) . Antibodies confirmed elevated IER3 expression via IHC and RNA-seq .

  • Acute Myeloid Leukemia (AML): High IER3 expression promotes autophagy and tumorigenesis by suppressing AKT/mTOR phosphorylation. Knockdown reduced LC3B-II levels, indicating autophagy inhibition .

Cardiovascular Research

IER3 regulates apoptosis in cardiomyocytes, with dysregulation linked to dilated cardiomyopathy (DCM). NF-κB signaling induces IER3 transcription, influencing apoptotic gene expression .

Diagnostic Potential

  • IER3 antibodies enable differentiation of HCC from non-HCC tissues (AUC = 0.65, 95% CI 0.61–0.69) .

  • Prognostic utility in AML: Higher IER3 mRNA levels predict shorter survival (p < 0.0001) .

Therapeutic Targets

  • In pancreatic cancer, IER3 confers resistance to gemcitabine by activating the NUPR1/RELB/IER3 survival pathway .

  • Targeting IER3-mediated autophagy could inhibit AML progression .

Technical Considerations for Usage

  • Optimal Dilutions: WB (1:500–1:2000), IHC (1:50–1:200) .

  • Buffer Compatibility: PBS with sodium azide (0.02–0.09%) .

  • Storage: Stable at -20°C for 12 months .

Product Specs

Buffer
Preservative: 0.03% Proclin 300
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Form
Liquid
Lead Time
Typically, we can ship the products within 1-3 business days after receiving your order. Delivery times may vary depending on the purchase method or location. Please consult your local distributors for specific delivery timeframes.
Synonyms
IER3; DIF2; IEX1; PRG1; Radiation-inducible immediate-early gene IEX-1; Differentiation-dependent gene 2 protein; Protein DIF-2; Immediate early protein GLY96; Immediate early response 3 protein; PACAP-responsive gene 1 protein; Protein PRG1
Target Names
Uniprot No.

Target Background

Function
IER3, also known as IEX-1, is a protein that has been implicated in a variety of cellular processes, including cell survival, apoptosis, and proliferation. It may play a role in the ERK signaling pathway by inhibiting the dephosphorylation of ERK by phosphatase PP2A-PPP2R5C holoenzyme. IER3 also acts as an ERK downstream effector mediating survival. As a member of the NUPR1/RELB/IER3 survival pathway, IER3 may provide pancreatic ductal adenocarcinoma with remarkable resistance to cell stress, such as starvation or gemcitabine treatment.
Gene References Into Functions
  1. Our findings suggest for the first time that the increased expression of IER3 protein may promote the aggressive progression of BCa. Notably, IER3 may be a potential prognostic marker for BCa patients. PMID: 30249226
  2. We determined the molecular mechanism responsible for IER3 degradation, involving a ternary complex of IER3, MDM2 and FHL2, which may contribute to cervical tumor growth. Furthermore, we demonstrated that FHL2 serves as a scaffold for E3 ligase and its substrate during the ubiquitination reaction, a function that has not been previously reported for this protein. PMID: 26973248
  3. Analysis of consensus EGR-binding elements (EBEs) showed that the immediate early response 3 gene (IER3) is a novel transcriptional target gene of EGR2 as confirmed by the luciferase assay, electrophoretic mobility-shift assay (EMSA), chromatin immunoprecipitation (ChIP), and western blot analysis. PMID: 27890615
  4. This study characterized IEX-1's expression and function in rheumatoid arthritis synovial fibroblasts and showed that IEX-1 is highly expressed in RA-SFs and negatively regulates RA-SF activation. PMID: 27736946
  5. Interleukin-1beta (IL-1beta)-induced IER3 expression is mediated by the ERK1/2 target, transcription factor Elk-1. PMID: 25066273
  6. Our findings suggest that IER3 is a putative tumor suppressor in the cervix, and the c-Ab1/p73beta/IER3 axis is a novel and crucial signaling pathway that confers etoposide chemosensitivity. PMID: 25666857
  7. High expression of IER3 is associated with hepatocarcinoma. PMID: 25684507
  8. In human samples removed from failed AVF, there was a significant increase in IEX-1 expression localized to the adventitia. PMID: 25036043
  9. IEX-1 expression levels correlate with the severity of preeclampsia. PMID: 23725081
  10. This study investigated the binding effect of hcmv-miR-UL148D to the 3' untranslated region (3'UTR) of IEX-1. Results showed that only one binding site in the 3'UTR of IEX-1 was completely complementary to an 11nt sequence in the 5' terminus of hcmv-mir-UL148D. PMID: 23403649
  11. The interference of IER3 with the PI3K/Akt-Fyn pathway represents a novel mechanism of Nrf2 regulation that may get lost in tumors and by which IER3 exerts its stress-adaptive and tumor-suppressive activity. PMID: 24311782
  12. IEX-1 plays a role in suppression of apoptosis and protects cells by controlling sensitivity to TNFalpha under both normal and inflammatory conditions. PMID: 21250941
  13. Altered IEX-1 expression can potentially be a new predictor of the malignant transformation and a prognostic indicator for cancer therapy. PMID: 22085302
  14. Changes of methylation status of gene IEX-1 promoter CpG island correlates with hematologic malignancies. PMID: 21518511
  15. IER3 plays a complex and to some extent contradictory role in cell cycle control and apoptosis. The effects of IER3 relate to an interference with certain signaling pathways. PMID: 21112119
  16. IER3 is upregulated in human PDLCs subjected to tensile stress related to mechano-induced cell cycle arrest. PMID: 20934684
  17. Results suggest that hypertension in IEX-1 knockout mice may arise primarily from impaired cAMP signaling induced by overproduction of mitochondrial reactive oxygen species in vascular smooth muscle cells. PMID: 20713914
  18. Impaired apoptosis, extended duration of immune responses, and a lupus-like autoimmune disease in IEX-1-transgenic mice. PMID: 11782530
  19. Regulation by p53 tumor suppressor and Sp1. PMID: 11844788
  20. Mechanical strain increased IEX-1 gene expression in macrophages. PMID: 11910304
  21. Characterization of a novel hexameric repeat DNA sequence in the promoter of the immediate early gene, IEX-1, that mediates 1alpha,25-dihydroxyvitamin D(3)-associated IEX-1 gene repression. PMID: 12032839
  22. IEX-1 is a new type of ERK substrate that has a dual role in ERK signaling by acting both as an ERK downstream effector mediating survival and as a regulator of ERK activation. PMID: 12356731
  23. IEX-1 has roles in regulation of cell death and oncogenesis [review]. PMID: 12510147
  24. Overexpression of IEX-1S results in acceleration of TNF-alpha-induced hepatocyte apoptosis through blockade of the PI3K/Akt survival pathway. PMID: 12682234
  25. The failure of IEX-1 to express its protein reflects the numerous mechanisms by which HSV-1 thwarts the cells from expressing its genes after infection. PMID: 12743274
  26. IEX-1 attenuates NF-kappaB activation, a possible counter-regulatory process leading to apoptosis. PMID: 12761504
  27. IEX-1 expression was stimulated by hydroxytamoxifen, and the degree of increase was greater in resistant cells (four-fold versus 1.5-fold). This hydroxytamoxifen regulation was estrogen receptor dependent. PMID: 15120418
  28. Our data suggest that IEX-1 may regulate apoptosis by directly interacting with various proteins involved in the control of apoptotic pathways. PMID: 15451437
  29. We concluded that IEX-1 mRNA is not preferentially degraded during HSV-1 infection and that HSV-1 instead inhibits the normal turnover of this mRNA. PMID: 15767410
  30. We found that p73beta targets the apoptotic program at multiple levels: facilitating caspase activation through p53-dependent signals and inducing p57KIP2, while down-regulating c-IPA1 and IEX1 through a p53-independent mechanism. PMID: 15781630
  31. IEX-1 is organized in subnuclear structures and partially co-localizes with promyelocytic leukemia protein in HeLa cells. PMID: 15855159
  32. Sequence-targeting mutagenesis reveals a transmembrane-like integrated region of the protein that is critical for both pro-apoptotic and anti-apoptotic functions. PMID: 16567805
  33. IEX-1 plays an important role in astrocytic differentiation of human glioma cells and that IEX-1 functions at downstream of PKA. PMID: 16960879
  34. ICP27 is essential for IEX-1 mRNA stabilization whereas virion host shut plays little if any role. PMID: 16973576
  35. Modulates NF-kappaB-dependent antiapoptotic protection and thereby exerts tumor-suppressive potential. PMID: 17704804
  36. This study indicates that an evaluation of IEX-1 expression may be clinically useful for predicting patient prognosis in pancreatic cancer. PMID: 18026799
  37. This study showed that IEX-1 is involved in the radiation-induced apoptosis of human glioma cells and that its overexpression enhances the apoptotic sensitivity of these cells to gamma-radiation. PMID: 18564103
  38. Down-regulation of the IEX-1 gene was associated with short survival in myelodysplastic syndrome patients. PMID: 19152102
  39. This study demonstrated the physical association of the MCL-1 and IEX-1 proteins, the modulatory role of MCL-1 in IEX-1-induced apoptosis, and the role of BIM as an essential downstream molecule for IEX-1-induced cell death. PMID: 19285955
  40. The small interfering RNA knockdown of BNIP3, IER3, and SEPW1 genes affected critical multiple myeloma endothelial cell functions correlated with the overangiogenic phenotype. PMID: 19690192
  41. Results suggest dysregulated expression of IER3 is common in MDS (61% >4-fold increase or decrease in expression with decreased expression primarily in early MDS and increased expression primarily in later MDS progressing toward leukemia). PMID: 19773435

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Database Links

HGNC: 5392

OMIM: 602996

KEGG: hsa:8870

STRING: 9606.ENSP00000259874

UniGene: Hs.730861

Protein Families
IER3 family
Subcellular Location
Membrane; Single-pass type II membrane protein.

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