Cited by 65Autophagy in Disease and TherapyIron Metabolism and DisordersFerroptosis and cancer prognosis

Nutrient Deprivation of Cultured Rat Hepatocytes Increases the Desferrioxamine-available Iron Pool and Augments the Sensitivity to Hydrogen Peroxide

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Öllinger, Karin, Roberg, Karin·1997·Journal of Biological Chemistry

Abstract

Primary cultures of rat hepatocytes were subjected to amino acid and serum deprivation for 4 h. This treatment augmented the sensitivity to ensuing hydrogen peroxide exposure for 30 min. The by nutrient deprivation-increased autophagocytosis was confirmed by transmission electron microscopy and uptake of the lysosomotropic weak base acridine orange within the intracellular acidic vacuolar apparatus. The desferrioxamine-available pool of iron increased 2.5-fold during deprivation, compared with control cells. Furthermore, amino acid deprivation increased the cellular protein turnover, measured by radioactive labeling with -3H-Leu. Exposure to 40 microM ascorbic acid specifically decreased the turnover of ferritin, as estimated by enzyme-linked immunosorbent assay, and prevented an increase of the desferrioxamine-available iron pool, resulting in protection against hydrogen peroxide-induced cell killing. Thus, hepatocytes with nutrient deprivation-enhanced autophagocytosis contain a larger pool of catalytically active iron than control cells. This iron pool is mainly derived from the turnover (autophagocytosis) of cytosolic ferritin and is probably situated in the lysosomes. Furthermore, nutrient-deprived cells show augmented sensitivity to hydrogen peroxide-induced oxidative stress, since the enhanced availability of iron in low molecular weight form results in an increased potential of intralysosomal Fenton chemistry, that may cause lysosomal rupture with release of potent hydrolytic enzymes.

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Crossref · 10.1074/jbc.272.38.23707

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Authors
Öllinger, K., & Roberg, K.
Affiliations
Linköping University (SE)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1997-09
Volume
272
Issue
38
Pages
23707-23711
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2046663690
Cited by
65
References
35
Citations by year
2025: 1 · 2023: 1 · 2021: 3 · 2020: 2 · 2019: 2 · 2017: 1 · 2015: 2 · 2014: 2 · 2013: 3 · 2012: 1
FWCI
3.12
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Hematology › Iron Metabolism and Disorders
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Ferroptosis and cancer prognosis
Keywords
nutrient deprivation, hepatocytes, amino acid starvation, serum deprivation, hydrogen peroxide sensitivity, oxidative stress, autophagy, lysosomes, Fenton reaction, vitamin C, lysosomal rupture, protein turnover
MeSH terms
Animals, Autophagy, Cells, Cultured, Culture Media, Deferoxamine, Hydrogen Peroxide, Liver, Microscopy, Electron, Oxidation-Reduction, Rats

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