1) GMU-GIBH Joint School of Life Sciences, The Guangdong-Hong Kong-Macau Joint Laboratory for Cell Fate Regulation and Diseases, Guangzhou Medical University, Guangzhou 511436, China;2) Institute of Applied Anatomy and Reproductive Medicine, University of South China, Hengyang 421001, China;3) Institute of Cardiovascular Disease, Key Laboratory for Arteriosclerology of Hunan Province, University of South China, Hengyang 421001, China;4) Ultrasonic Medical Department, The Affiliated TCM Hospital of Guangzhou Medical University, Guangzhou Hospital of Traditional Chinese Medicine, Guangzhou 510130, China
This work was supported by grants from the Youth Innovative Talents Program and Characteristic Innovative Talents Program of Regular Institutions of Higher Education of Guangdong Province (2018KQNCX212, 2020KTSCX101), the Scientific Research Project of Traditional Chinese Medicine Bureau of Guangdong Province (20222122), the Excellent Youth Science Research Program of the Education Department of Hunan Province (14B183), Bureau of Education of Guangzhou Municipality (202032801), the Plan on Enhancing Scientific Research in Guangzhou Medical University, and the Open Research Funds(2021) and the Funds of Selected Project(2022) from GMU-GIBH Joint School of Life Sciences, Guangzhou Medical University.
Objective OxLDL can increase Plin2 expression, then promote the formation of foam cells. LOX1 was a scavenger receptor for oxLDL. Here, we investigate the relationship between Plin2 and LOX1 in the progress of atherosclerosis.Methods The data GSE43292 from GEO database were analyzed for Plin2 and LOX1 expressions and the correlation between Plin2, LOX1 and NF-κB pathway. RAW264.7 cells stimulated by oxLDL served as a cellular model of atherosclerosis. The Plin2, LOX1 and p-p65 expressions were analyzed by immunoblotting, the intracellular lipids were detected by BODIPY 493/503 staining.Results The Plin2 and LOX1 expressions in atheroma plaques were significantly higher than that in adjacent carotid tissues by analyzing GSE43292. The expressions of Plin2 and LOX1, the lipid droplets were increased obviously in RAW264.7 cells after treated with oxLDL for 24 h. And Plin2 overexpression significantly increased the expression of LOX1. This change was more obvious after oxLDL incubation. But knockdown Plin2 maked no difference on LOX1 when without oxLDL treatment. Furthermore, the GSEA plot showed that the expressions of Plin2 and LOX1 were positively related with NF-κB activation in atherosclerosis. Meanwhile, although oxLDL incubation, NF-κB inhibitor JSH-23 pretreatment significantly reduced Plin2 and LOX1 expressions and the amounts of intracellular lipids. In addition, the expressions of Plin2 and LOX1 were significantly inhibited by JSH-23 in spite of Plin2 overexpression plus oxLDL incubation.Conclusion Altogether, Plin2 can promote the intracellular lipids accumulation and may participate in pathophysiological process of atherosclerosis by increasing the expression of LOX1, which at least partly through the activation of NF-κB pathway.
LIU Qing-Nan, ZHAO Xiao-Hui, LI Shuai, GUO Dong-Ming, YUAN Zhong-Hua, LI Jing, DONG Shan-Shan, WANG Yi-Qian, DAI Zhi-Bing. Plin2 Involved in oxLDL Induced LOX1 Expression in Macrophages via NF-κB Pathway[J]. Progress in Biochemistry and Biophysics,2023,50(11):2697-2708
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