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Updated: May 19, 2026
Quantitation of Intra-peritoneal Ovarian Cancer Metastasis
Published on: July 18, 2016
IKK-ε coordinates invasion and metastasis of ovarian cancer
Sarah Hsu1, Marianne Kim, Lidia Hernandez
1Medical Oncology Branch, National Cancer Institute, Bethesda, MD 20892, USA.
Abstract:
Inhibitor of IκB kinases (IKK) are key regulators of NF-κB signaling. Three IKK isoforms-α, β, and ε-have been linked to oncogenesis, yet the precise components of NF-κB signaling in ovarian cancer have not yet been dissected. We surveyed 120 ovarian cancer specimens for IKK-ε expression. Notably, cytoplasmic expression was elevated in metastatic lesions relative to primary tumors (P = 0.03). Therefore, we hypothesized that IKK-ε drives ovarian cancer metastasis. IKK-ε was identified previously as a breast cancer oncogene and was associated with poor clinical outcome in ovarian cancer. We now define an ovarian cancer-specific IKK-ε-regulated gene expression signature using stably expressed short hairpin RNA targeting IKK-ε. Pathway analysis of the signature indicated that IKK-ε regulates expression of genes involved in cell motility and inflammation. We further showed that IKK-ε depletion in metastatic ovarian cancer cell lines decreased growth, adhesion, and invasion. Consistently, human xenografts depleted of IKK-ε in mice showed decreased aggressiveness, whereas overexpression of IKK-ε in a less invasive ovarian cancer cell line increased metastasis in vivo. Taken together, these data provide evidence that IKK-ε is a key coordinator of invasion and metastasis programs in ovarian cancer. Inhibition of IKK-ε signaling thus emerges as a viable therapeutic strategy in women whose ovarian cancer shows aberrant activation of this pathway.
Insights
Inhibitor of IκB kinases-ε (IKK-ε) promotes ovarian cancer metastasis. Targeting IKK-ε may offer a new therapeutic strategy for ovarian cancer patients with aberrant IKK-ε activation.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Signaling
Background:
- Inhibitor of IκB kinases (IKK) regulate NF-κB signaling, with IKK-α, IKK-β, and IKK-ε linked to oncogenesis.
- The specific role of NF-κB signaling components in ovarian cancer remains unclear.
- IKK-ε is a known breast cancer oncogene and associated with poor ovarian cancer outcomes.
Purpose of the Study:
- To investigate the role of IKK-ε in ovarian cancer metastasis.
- To define the ovarian cancer-specific IKK-ε-regulated gene expression signature.
- To evaluate IKK-ε as a potential therapeutic target in ovarian cancer.
Main Methods:
- Surveyed 120 ovarian cancer specimens for IKK-ε expression.
- Defined an ovarian cancer-specific IKK-ε-regulated gene expression signature using short hairpin RNA (shRNA) targeting IKK-ε.
- Assessed the impact of IKK-ε depletion/overexpression on ovarian cancer cell line growth, adhesion, invasion, and in vivo xenograft aggressiveness.
Main Results:
- Cytoplasmic IKK-ε expression was significantly elevated in metastatic ovarian cancer lesions compared to primary tumors.
- IKK-ε depletion decreased ovarian cancer cell line growth, adhesion, and invasion.
- IKK-ε depletion reduced xenograft aggressiveness, while overexpression increased metastasis in vivo.
- Pathway analysis revealed IKK-ε regulates genes involved in cell motility and inflammation.
Conclusions:
- IKK-ε is a key regulator of invasion and metastasis in ovarian cancer.
- Aberrant IKK-ε activation drives ovarian cancer progression.
- Inhibition of IKK-ε signaling represents a potential therapeutic strategy for ovarian cancer.
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