Double-edged Sword Role of Iron-loaded Ferritin in Extracellular Vesicles
10.15430/JCP.2021.26.4.244
- Author:
Shinya TOYOKUNI
1
;
Yingyi KONG
;
Hao ZHENG
;
Danyang MI
;
Misako KATABUCHI
;
Yashiro MOTOOKA
;
Fumiya ITO
Author Information
1. Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Nagoya, Japan
- Publication Type:Review
- From:Journal of Cancer Prevention
2021;26(4):244-249
- CountryRepublic of Korea
- Language:English
-
Abstract:
Human epidemiological and animal studies have demonstrated that excess iron is a risk for cancer. The responsible mechanisms are: 1) increased intracellular iron catalyzes the Fenton reaction to generate hydroxyl radicals, leading to mutagenic oxidative DNA lesions; 2) iron is necessary for cellular proliferation as cofactors of many enzymes. Thus, iron-excess milieu promotes selecting cellular evolution to ferroptosis-resistance, a major basis for carcinogenesis. Ferritin is a 24-subunit nanocage protein required for iron storage under the regulation of the iron-regulatory protein (IRP)/iron-responsive element (IRE) system. Ferritin is a serum marker, representing total body iron storage. However, how ferritin is secreted extracellularly has been unelucidated. We recently discovered that an exosomal marker CD63 is regulated by the IRP/IRE system and that iron-loaded ferritin is secreted as extracellular vesicles under the guidance of nuclear receptor coactivator 4 (NCOA4). On the other hand, we found that macrophages under asbestos-induced ferroptosis emit ferroptosis-dependent extracellular vesicles (FedEVs), which are received by nearby mesothelial cells, resulting in significant mutagenic DNA damage. Therefore, cells, including macrophages, can share excess iron with other cells, via iron-loaded ferritin packaged in extracellular vesicles as safe non-catalytic iron. However, similar process, such as one involving FedEVs, may cause accumulation of excess iron in other specific cells, which may eventually promote carcinogenesis.
