Related Experiment Video

Updated: Aug 13, 2026

Synthesis and Characterization of an Aspirin-fumarate Prodrug that Inhibits NFκB Activity and Breast Cancer Stem Cells
13:38

Synthesis and Characterization of an Aspirin-fumarate Prodrug that Inhibits NFκB Activity and Breast Cancer Stem Cells

Published on: January 18, 2017

Blocking tumor cell eicosanoid synthesis by GP x 4 impedes tumor growth and malignancy

Ingeborg Heirman1, Daisy Ginneberge, Regina Brigelius-Flohé

  • 1Department for Molecular Biomedical Research, Flanders Interuniversity Institute for Biotechnology and Ghent University, Molecular Immunology Unit, Technologiepark 927, B-9052 Ghent, Belgium.

Free Radical Biology & Medicine
|January 18, 2006
PubMed

Insights

Overexpressing glutathione peroxidase 4 (GPx4) in tumor cells suppressed growth in some cancers but enhanced therapy response in others. GPx4 impacts tumor eicosanoid production, influencing tumor progression and metastasis.

Area of Science:

  • Biochemistry
  • Cancer Biology
  • Molecular Oncology

Background:

  • Eicosanoids, lipid mediators derived from arachidonic acid, play critical roles in inflammation, immunity, and cancer.
  • Cyclooxygenase (COX) and lipoxygenase (LOX) pathways are key in eicosanoid synthesis and are implicated in tumor growth and progression.
  • Glutathione peroxidase 4 (GPx4) is an antioxidant enzyme that can inhibit COX and LOX activities by reducing lipid hydroperoxides.

Purpose of the Study:

  • To investigate the role of tumor cell-derived eicosanoids in solid tumor growth and malignant progression.
  • To determine the impact of GPx4-mediated inhibition of eicosanoid synthesis on tumor behavior in models with differing tumorigenic potential.
  • To elucidate the relationship between GPx4, eicosanoid production, and the induction of COX-2.

Main Methods:

  • Tumor cell-restricted overexpression of GPx4 in L929 fibrosarcoma and B16BL6 melanoma models.
  • Assessment of solid tumor growth, metastatic capacity, and response to TNF-alpha therapy.
  • Measurement of prostaglandin E(2) (PGE(2)) production and COX-2 expression under various conditions (hypoxia, inflammation, exogenous PGE(2)).

Main Results:

  • GPx4 overexpression significantly impeded solid tumor growth of weakly tumorigenic L929 cells but not B16BL6 melanoma.
  • GPx4 overexpression increased B16BL6 tumor sensitivity to TNF-alpha therapy and abolished lung metastasis.
  • GPx4 suppressed tumor cell PGE(2) production, which in turn impeded hypoxia- and inflammation-induced COX-2 expression, indicating a PGE(2)-driven positive feedback loop for COX-2.

Conclusions:

  • Tumor cell-derived eicosanoids play a predominant role in promoting solid tumor growth and malignant progression.
  • GPx4's impact on tumor eicosanoids influences tumor growth, metastatic potential, and therapeutic sensitivity.
  • The findings highlight a PGE(2)-mediated positive feedback loop for COX-2 expression in tumor cells, crucial for tumor progression.

Related Concept Videos

The Tumor Microenvironment02:17

The Tumor Microenvironment

Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
Abnormal Proliferation02:23

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
Tumor Immunotherapy01:27

Tumor Immunotherapy

Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.