IKBKE (Inhibitor of Nuclear Factor Kappa-B Kinase Subunit Epsilon), also known as IKKε or IKK-Epsilon, is a serine/threonine protein kinase that plays important roles in the innate immune response, inflammatory signaling, and has been implicated in cancer and metabolic diseases. It is one of the IKK family members (IKKα, IKKβ, IKKγ, IKKε, TBK1).
Gene Overview
<div class="infobox infobox-gene"> | Property | Value | |----------|-------| | Gene Symbol | IKBKE | | Full Name | Inhibitor of Nuclear Factor Kappa-B Kinase Subunit Epsilon | | Chromosomal Location | 1q31.3 | | NCBI Gene ID | 9641 | | OMIM | 605048 | | Ensembl | ENSG00000105468 | | UniProt | Q14164 | | Associated Diseases | Breast cancer, pancreatic cancer, inflammatory diseases, viral infections | </div>
Overview
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IKBKE
IKBKE (Inhibitor of Nuclear Factor Kappa-B Kinase Subunit Epsilon), also known as IKKε or IKK-Epsilon, is a serine/threonine protein kinase that plays important roles in the innate immune response, inflammatory signaling, and has been implicated in cancer and metabolic diseases. It is one of the IKK family members (IKKα, IKKβ, IKKγ, IKKε, TBK1).
Gene Overview
<div class="infobox infobox-gene"> | Property | Value | |----------|-------| | Gene Symbol | IKBKE | | Full Name | Inhibitor of Nuclear Factor Kappa-B Kinase Subunit Epsilon | | Chromosomal Location | 1q31.3 | | NCBI Gene ID | 9641 | | OMIM | 605048 | | Ensembl | ENSG00000105468 | | UniProt | Q14164 | | Associated Diseases | Breast cancer, pancreatic cancer, inflammatory diseases, viral infections | </div>
Overview
Mermaid diagram (expand to render)
IKBKE is a human gene whose product iKBKE is a non-canonical IKK family member that phosphorylates IkappaB proteins and activates [NF-kappaB](/entities/nf-kb) signaling, but also has IkappaB-independent functions["@hemmings2007"]:. Variants in IKBKE have been implicated in Cancer, Inflammation, Neurodegeneration. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration.
Normal Function
IKBKE is a non-canonical IKK family member that phosphorylates IκB proteins and activates NF-κB signaling, but also has IκB-independent functions[@hemmings2007]:
NF-κB Activation
IκB Phosphorylation: Phosphorylates IκBα and IκBβ, leading to NF-κB activation
IKK Complex: Can form complexes with IKKγ/NEMO for NF-κB signaling
Alternative Pathway: Mediates TLR-induced NF-κB activation
Immune Signaling
TLR Response: Essential for TLR3 and [TLR4](/entities/tlr4)-mediated antiviral responses
Type I IFN Induction: Critical for IRF3/IRF7 activation and IFN-β production[@fitzgerald2003]
Viral Defense: Coordinates innate immune response to viral infections
Metabolic Functions
Insulin Signaling: IKBKE is activated by insulin and modulates insulin sensitivity
Adipogenesis: Regulates adipocyte differentiation
Lipid Metabolism: Influences fatty acid oxidation and storage
Disease Associations
Cancer
Oncogenic Driver: IKBKE is amplified and overexpressed in breast cancer[@hershko2004]
Tumor Survival: Promotes tumor cell survival and proliferation
Metastasis: Associated with metastatic potential
Inflammation
Autoimmune Diseases: Elevated IKBKE activity in rheumatoid arthritis and lupus
Inflammatory Bowel Disease: Contributes to chronic intestinal inflammation
Multiple Sclerosis: Altered signaling in CNS autoimmunity
Neurodegeneration
Alzheimer's Disease: IKBKE is upregulated in AD brains and promotes neuroinflammation
Parkinson's Disease: Contributes to microglial activation and dopaminergic neuron loss
ALS: Altered immune signaling in motor neuron disease
In the brain, IKBKE is expressed in [microglia](/cell-types/microglia-neuroinflammation) and neurons, with increased expression during neuroinflammation.
Therapeutic Implications
Drug Development
IKBKE Inhibitors: Several small molecule inhibitors in preclinical/clinical development
Combination Therapy: IKBKE inhibitors with immunotherapy for cancer
[Kravchenko VV, Mathison JC, Schwamborn K, et al, IKKi/IKKε plays a key role in integrating signals induced by pro-inflammatory stimuli (2003)](https://pubmed.ncbi.nlm.nih.gov/12750372/)
[Hemmings BA, IKKε: a kinase involved in the innate immune response (2007)](https://pubmed.ncbi.nlm.nih.gov/17290066/)
[Fitzgerald KA, McWhirter SM, Faia KL, et al, IKKε and TBK1 are essential components of the IRF3 signaling pathway (2003)](https://pubmed.ncbi.nlm.nih.gov/12692549/)
[Hershko DD, Robb BW, Luo G, Hasselgren PO, Multiple transcription factors regulating the expression of the gene encoding atrial natriuretic peptide are activated by IKKε in sepsis (2004)](https://pubmed.ncbi.nlm.nih.gov/15082972/)
Pathway Diagram
The following diagram shows the key molecular relationships involving IKBKE (IKKε) discovered through SciDEX knowledge graph analysis: