The role of lysosomes in iron metabolism and recycling
2011 (English)In: International Journal of Biochemistry and Cell Biology, ISSN 1357-2725, E-ISSN 1878-5875, Vol. 43, no 12, 1686-1697 p.Article, review/survey (Refereed) Published
Iron is the most abundant transition metal in the earths crust. It cycles easily between ferric (oxidized; Fe(III)) and ferrous (reduced; Fe(II)) and readily forms complexes with oxygen, making this metal a central player in respiration and related redox processes. However, loose iron, not within heme or iron-sulfur cluster proteins, can be destructively redox-active, causing damage to almost all cellular components, killing both cells and organisms. This may explain why iron is so carefully handled by aerobic organisms. Iron uptake from the environment is carefully limited and carried out by specialized iron transport mechanisms. One reason that iron uptake is tightly controlled is that most organisms and cells cannot efficiently excrete excess iron. When even small amounts of intracellular free iron occur, most of it is safely stored in a non-redox-active form in ferritins. Within nucleated cells, iron is constantly being recycled from aged iron-rich organelles such as mitochondria and used for construction of new organelles. Much of this recycling occurs within the lysosome, an acidic digestive organelle. Because of this, most lysosomes contain relatively large amounts of redox-active iron and are therefore unusually susceptible to oxidant-mediated destabilization or rupture. In many cell types, iron transit through the lysosomal compartment can be remarkably brisk. However, conditions adversely affecting lysosomal iron handling (or oxidant stress) can contribute to a variety of acute and chronic diseases. These considerations make normal and abnormal lysosomal handling of iron central to the understanding and, perhaps, therapy of a wide range of diseases.
Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 43, no 12, 1686-1697 p.
Autophagy; Iron; Iron-binding proteins; Lipofuscin; Lysosomes
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-73315DOI: 10.1016/j.biocel.2011.08.016ISI: 297491700007OAI: oai:DiVA.org:liu-73315DiVA: diva2:472074