Tumor cell lipids and redox-active iron pool (LIP/PUFA)

The tumor cell lipids and redox-active iron pool refers to the essential biochemical substrates required for the execution of ferroptosis, a form of regulated cell death characterized by iron-dependent lipid peroxidation (Dixon et al., 2012). This target comprises membrane-bound polyunsaturated fatty acids (PUFAs), particularly those incorporated into phospholipids by enzymes like ACSL4, and the intracellular labile iron pool (LIP), which consists of redox-active ferrous iron (Fe2+) (Stockwell et al., 2017). In many cancer cells, particularly those in a mesenchymal or therapy-resistant state, there is an enrichment of these components, creating a metabolic vulnerability (Hassannia et al., 2019). Pharmacological intervention typically involves triggering the Fenton reaction, where the redox-active iron catalyzes the oxidation of PUFAs into lethal lipid hydroperoxides (Jiang et al., 2021). This process occurs when antioxidant defenses, most notably Glutathione Peroxidase 4 (GPX4), are inhibited or depleted (Stockwell, 2022). Drugs such as erastin, RSL3, and artesunate exploit this mechanism to selectively induce cell death in tumor cells (Lei et al., 2022). The therapeutic strategy focuses on shifting the cellular balance toward pro-oxidant conditions that favor the interaction between iron and lipids (Conrad & Pratt, 2019). Monitoring biomarkers like ACSL4 expression and lipid peroxidation products is crucial for identifying susceptible patient populations (Torti et al., 2020).

Other names

Labile iron pool (LIP)Redox-active ironMembrane polyunsaturated fatty acids (PUFAs)Ferroptosis substratesIron-lipid axis

Induction of iron-dependent lipid peroxidation leading to membrane rupture and cell death (ferroptosis).