Membrane Stress and Ferroptosis: Lipid Dynamics in Cancer

TL;DR

This paper explores how lipid dynamics and membrane stress contribute to ferroptosis, a type of cell death relevant to cancer, and suggests possible therapeutic strategies.

Contribution

The paper integrates recent findings on membrane components and environmental stressors influencing ferroptosis in cancer.

Findings

Tumor acidosis shifts metabolism to increase PUFAs, making membranes more susceptible to lipid peroxidation.

Cholesterol helps mitigate membrane stress but can become a pro-oxidant when glutathione is deficient.

Ceramide prevents ferroptosis by aiding cytochrome c release, offering a potential therapeutic target.

Abstract

Membrane rupture, induced by lipid peroxidation, is a severe threat to osmotic balance, as membrane pores contribute to ferroptosis, an iron-dependent cell death. To alleviate osmotic stress, membrane constituents dynamically reconstruct the membrane and interact with intracellular molecules. Tumor-derived acidosis shift glycolysis-dependent metabolism toward lipid metabolism, increasing polyunsaturated fatty acids (PUFAs). PUFAs enhance membrane fluidity but make cancer susceptible to lipid peroxidation. Also, the ionization of phospholipids under low pH can accelerate membrane rupture. This stress can be mitigated by the redistribution of cholesterol, which maintains tension–compression balance and acts as antioxidants. When excessive reactive aldehydes—byproducts of lipid peroxidation—overwhelm cholesterol’s protective role, lipid peroxides promote membrane cracks. Moreover, a deficiency in glutathione can alter cholesterol’s function, turning it into a pro-oxidant. In contrast, ceramide, derived from membrane lipids, indirectly prevents ferroptosis by facilitating cytochrome c release. This review integrates recent findings on how membrane components and environmental stressors influence ferroptosis. It also suggests potential therapeutic strategies. This could advance our understanding of ferroptosis in cancer.

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