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Endosomal and lysosomal effects of desferrioxamine: Protection of HeLa cells from hydrogen peroxide-induced DNA damage and induction of cell-cycle arrest
Linköping University, Faculty of Health Sciences. Linköping University, Department of Neuroscience and Locomotion, Pathology. Östergötlands Läns Landsting, Centre for Laboratory Medicine, Department of Clinical Pathology and Clinical Genetics.
2003 (English)In: Free Radical Biology & Medicine, ISSN 0891-5849, Vol. 35, no 7, 719-728 p.Article in journal (Refereed) Published
Abstract [en]

The role of endosomal/lysosomal redox-active iron in H2O 2-induced nuclear DNA damage as well as in cell proliferation was examined using the iron chelator desferrioxamine (DFO). Transient transfections of HeLa cells with vectors encoding dominant proteins involved in the regulation of various routes of endocytosis (dynamin and Rab5) were used to show that DFO (a potent and rather specific iron chelator) enters cells by fluid-phase endocytosis and exerts its effects by chelating redox-active iron present in the endosomal/lysosomal compartment. Endocytosed DFO effectively protected cells against H2O2-induced DNA damage, indicating the importance of endosomal/lysosomal redox-active iron in these processes. Moreover, exposure of cells to DFO in a range of concentrations (0.1 to 100 ╡M) inhibited cell proliferation in a fluid-phase endocytosis- dependent manner. Flow cytometric analysis of cells exposed to 100 ╡M DFO for 24 h showed that the cell cycle was transiently interrupted at the G 2/M phase, while treatment for 48 h led to permanent cell arrest. Collectively, the above results clearly indicate that DFO has to be endocytosed by the fluid-phase pathway to protect cells against H2O 2-induced DNA damage. Moreover, chelation of iron in the endosomal/lysosomal cell compartment leads to cell cycle interruption, indicating that all cellular labile iron is propagated through this compartment before its anabolic use is possible.

Place, publisher, year, edition, pages
2003. Vol. 35, no 7, 719-728 p.
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Medical and Health Sciences
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URN: urn:nbn:se:liu:diva-27709DOI: 10.1016/S0891-5849(03)00396-4Local ID: 12447OAI: oai:DiVA.org:liu-27709DiVA: diva2:248261
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2011-01-13

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Brunk, Ulf

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