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L-serine restored lysosomal failure in cells derived from patients with BPAN reducing iron accumulation with eliminating lipofuscin.
- Source :
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Free radical biology & medicine [Free Radic Biol Med] 2024 Aug 20; Vol. 221, pp. 273-282. Date of Electronic Publication: 2024 May 11. - Publication Year :
- 2024
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Abstract
- Defective mitochondria and autophagy, as well as accumulation of lipid and iron in WDR45 mutant fibroblasts, is related to beta-propeller protein-associated neurodegeneration (BPAN). In this study, we found that enlarged lysosomes in cells derived from patients with BPAN had low enzyme activity, and most of the enlarged lysosomes had an accumulation of iron and oxidized lipid. Cryo-electron tomography revealed elongated lipid accumulation, and spectrometry-based elemental analysis showed that lysosomal iron and oxygen accumulation superimposed with lipid aggregates. Lysosomal lipid aggregates superimposed with autofluorescence as free radical generator, lipofuscin. To eliminate free radical stress by iron accumulation in cells derived from patients with BPAN, we investigated the effects of the iron chelator, 2,2'-bipyridine (bipyridyl, BIP). To study whether the defects in patient-derived cells can be rescued by an iron chelator BIP, we tested whether the level of iron and reactive oxygen species (ROS) in the cells and genes related to oxidative stress were rescued BIP treatment. Although BIP treatment decreased some iron accumulation in the cytoplasm and mitochondria, the accumulation of iron in the lysosomes and levels of cellular ROS were unaffected. In addition, the change of specific RNA levels related to free radical stress in patient fibroblasts was not rescued by BIP. To alleviate free radical stress, we investigated whether l-serine can regulate abnormal structures in cells derived from patients with BPAN through the regulation of free radical stress. l-serine treatment alleviated increase of enlarged lysosomes and iron accumulation and rescued impaired lysosomal activity by reducing oxidized lipid accumulation in the lysosomes of the cells. Lamellated lipids in the lysosomes of the cells were identified as lipofuscin through correlative light and electron microscopy, and l-serine treatment reduced the increase of lipofuscin. These data suggest that l-serine reduces oxidative stress-mediated lysosomal lipid oxidation and iron accumulation by rescuing lysosomal activity.<br />Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.<br /> (Copyright © 2024. Published by Elsevier Inc.)
- Subjects :
- Humans
Mitochondria metabolism
Mitochondria drug effects
Mitochondria pathology
Neuroaxonal Dystrophies metabolism
Neuroaxonal Dystrophies pathology
Neuroaxonal Dystrophies drug therapy
Neuroaxonal Dystrophies genetics
2,2'-Dipyridyl pharmacology
2,2'-Dipyridyl analogs & derivatives
Iron Chelating Agents pharmacology
Lysosomes metabolism
Lysosomes drug effects
Lipofuscin metabolism
Iron metabolism
Fibroblasts metabolism
Fibroblasts drug effects
Fibroblasts pathology
Oxidative Stress drug effects
Reactive Oxygen Species metabolism
Serine metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1873-4596
- Volume :
- 221
- Database :
- MEDLINE
- Journal :
- Free radical biology & medicine
- Publication Type :
- Academic Journal
- Accession number :
- 38740102
- Full Text :
- https://doi.org/10.1016/j.freeradbiomed.2024.05.017