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Oxidative Stress and Lipid Dysregulation in Lipid Droplets : A Connection to Chronic Kidney Disease Revealed in Human Kidney Cells

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Title: Oxidative Stress and Lipid Dysregulation in Lipid Droplets : A Connection to Chronic Kidney Disease Revealed in Human Kidney Cells
Authors: Chen, Zhen Browse this author →KAKEN DB
Shrestha, Rojeet Browse this author
Yang, Xiaoyue Browse this author
Wu, Xunzhi Browse this author
Jia, Jiaping Browse this author
Chiba, Hitoshi Browse this author →KAKEN DB
Hui, Shu-Ping Browse this author →KAKEN DB
Keywords: lipid droplets (LDs)
chronic kidney disease (CKD)
oxidative stress
ectopic lipid accumulation
lipid hydroperoxides
cholesteryl esters
molecular species
Issue Date: 18-Jul-2022
Publisher: MDPI
Journal Title: Antioxidants
Volume: 11
Issue: 7
Start Page: 1387
Publisher DOI: 10.3390/antiox11071387
PMID: 35883878
Abstract: Chronic kidney disease (CKD), which is defined as a condition causing the gradual loss of kidney function, shows renal lipid droplet (LD) accumulation that is associated with oxidative damage. There is a possibility that an LD abnormality in quality plays a role in CKD development. This study aimed to explore the chemical composition of LDs that are induced in human kidney cells during exposure to free fatty acids as an LD source and oxidized lipoproteins as oxidative stress. The LDs were aspirated directly from cells using nanotips, followed by in-tip microextraction, and the LD lipidomic profiling was conducted using nanoelectrospray mass spectrometry. As a result, the free fatty acids increased the LD lipid content and, at the same time, changed their composition significantly. The oxidized lipoproteins caused distorted proportions of intact lipids, such as triacylglycerols (TG), phosphatidylcholines (PC), phosphatidylethanolamines (PE), and cholesteryl esters (CE). Notably, the oxidized lipids, including the hydroperoxides of TG, PC, and PE, exhibited significant elevations in dose-dependent manners. Furthermore, the dysregulation of intact lipids was paralleled with the accumulation of lipid hydroperoxides. The present study has revealed that the oxidation of lipids and the dysregulation of the lipid metabolism coexisted in LDs in the kidney cells, which has provided a potential new target for diagnosis and new insights into CKD.
Type: article
Appears in Collections:保健科学院・保健科学研究院 (Graduate School of Health Sciences / Faculty of Health Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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