Iron Overload Damages the Endothelial Mitochondria via the ROSADMADDAHIIeNOSNO Pathway
Joint Authors
He, Ming
He, Huan
Liu, Dan
Yin, Dong
Qiao, Yang
Zhou, Qing
Wang, Zhiqing
Chen, Xuepiao
Source
Oxidative Medicine and Cellular Longevity
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-19, 19 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-11-12
Country of Publication
Egypt
No. of Pages
19
Main Subjects
Abstract EN
It has been recognized that iron overload may harm the body’s health.
Vascular endothelial cells (VECs) are one of the main targets of iron overload injury, and the mechanism involved was thought to be related to the excessive generation of reactive oxygen species (ROS).
However, the subcellular and temporal characteristics of ROS generation, potential downstream mechanisms, and target organelles in VECs injured by iron overload have not been expounded yet.
In this study, we elucidated the abovementioned issues through both in vivo and in vitro experiments.
Mice were fed pellet diets that were supplemented with iron for 4 consecutive months.
Results showed that the thoracic aortic strips’ endothelium-dependent dilation was significantly impaired and associated with inflammatory changes, noticeable under brown TUNEL-positive staining in microscopy analysis.
In addition, the serum content of asymmetric dimethylarginine (ADMA) increased, whereas nitric oxide (NO) levels decreased.
Furthermore, the dimethylarginine dimethylaminohydrolase II (DDAHII) expression and activity, as well as the phosphorylation of endothelial nitric oxide synthase (eNOS) in aortic tissue, were inhibited.
Human umbilical vein endothelial cells were treated with 50 μM iron dextran for 48 hours, after which the cell viability, NO content, DDAHII expression and activity, and phosphorylation of eNOS decreased and lactate dehydrogenase and caspase-3 activity, ADMA content, and apoptotic cells significantly increased.
After the addition of L-arginine (L-Arg) or pAD/DDAHII, the abovementioned changes were reversed.
By dynamically detecting the changes of ROS generation in the cytoplasm and mitochondria and interfering with different aspects of signaling pathways, we have confirmed for the first time that excessive ROS originates from the cytoplasm and activates the ROS-induced ROS release (RIRR) mechanism, leading to mitochondrial dysfunction.
Together, our data suggested that excessive free iron ions produced excess ROS in the cytoplasm.
Thus, excess ROS create one vicious circle by activating the ADMA/eNOS/DDAHII/NO pathway and another vicious circle by activation of the RIRR mechanism, which, when combined, induce a ROS burst, resulting in mitochondrial dysfunction and damaged VECs.
American Psychological Association (APA)
He, Huan& Qiao, Yang& Zhou, Qing& Wang, Zhiqing& Chen, Xuepiao& Liu, Dan…[et al.]. 2019. Iron Overload Damages the Endothelial Mitochondria via the ROSADMADDAHIIeNOSNO Pathway. Oxidative Medicine and Cellular Longevity،Vol. 2019, no. 2019, pp.1-19.
https://search.emarefa.net/detail/BIM-1202598
Modern Language Association (MLA)
He, Huan…[et al.]. Iron Overload Damages the Endothelial Mitochondria via the ROSADMADDAHIIeNOSNO Pathway. Oxidative Medicine and Cellular Longevity No. 2019 (2019), pp.1-19.
https://search.emarefa.net/detail/BIM-1202598
American Medical Association (AMA)
He, Huan& Qiao, Yang& Zhou, Qing& Wang, Zhiqing& Chen, Xuepiao& Liu, Dan…[et al.]. Iron Overload Damages the Endothelial Mitochondria via the ROSADMADDAHIIeNOSNO Pathway. Oxidative Medicine and Cellular Longevity. 2019. Vol. 2019, no. 2019, pp.1-19.
https://search.emarefa.net/detail/BIM-1202598
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1202598