Related Experiment Video
Updated: Aug 16, 2026
04:01
Revealing the Ferroptotic Phenotype of Medulloblastoma
Published on: March 15, 2024
Polyunsaturated fatty acid sequestration protects against mitochondrial dysfunction-induced ferroptosis
Guillermo Puertas-Frías1,2, María José Saucedo-Rodríguez1,2, Kristýna Čunátová1
1Laboratory of Bioenergetics, Institute of Physiology, Czech Academy of Sciences, Vídeňská 1083, Prague, Czech Republic.
EMBO Reports
|August 14, 2026
Summary
Cells with impaired mitochondrial energy production accumulate polyunsaturated fatty acid-enriched lipids. This protects against ferroptosis, preserving cell integrity during oxidative phosphorylation defects.
Area of Science:
- Cellular Biology
- Metabolic Disorders
- Mitochondrial Function
Background:
- Mitochondrial oxidative phosphorylation (OXPHOS) defects impair energy production.
- Secondary metabolic disturbances exacerbate pathologies linked to OXPHOS dysfunction.
Purpose of the Study:
- To investigate the metabolic adaptations in cells with OXPHOS deficiencies.
- To identify protective mechanisms against cellular damage in mitochondrial disorders.
Main Methods:
- Analysis of lipid accumulation in cells with OXPHOS deficiencies.
- Assessment of gene expression for desaturases and GPX4.
- Study of cellular responses under hypoxia and in patient-derived fibroblasts.
- Measurement of plasma triacylglycerols in patients with MERRF.
Main Results:
- Cells with OXPHOS deficiencies accumulate triacylglycerols enriched in polyunsaturated fatty acids (PUFAs) in lipid droplets.
- This accumulation is part of a stress response involving desaturase downregulation and GPX4 upregulation.
- The protective mechanism is observed in hypoxic cells, patient fibroblasts, and MERRF patients.
- Elevated PUFA-enriched triacylglycerols are found in MERRF patient plasma.
Conclusions:
- Cells with OXPHOS defects activate a protective mechanism involving PUFA sequestration.
- This strategy mitigates ferroptosis and preserves membrane integrity under compromised mitochondrial respiration.
- Findings reveal a novel link between mitochondrial function, lipid metabolism, and ferroptosis.
Related Concept Videos
01:16Necrosis
Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
01:19Translocation of Proteins into the Mitochondria
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
01:45Mitochondrial Membranes
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
01:46Electron Transport Chain: Complex I and II
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
01:27Protein Import into the Peroxisomes
Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...