title: High-density lipoprotein nitration and chlorination catalyzed by myeloperoxidase impair its effect of promoting endothelial repair.
abstract: High-density lipoprotein (HDL) plays a key role in protecting against atherosclerosis. In cardiovascular disease, HDL can be nitrated and chlorinated by myeloperoxidase (MPO). In this study, we discovered that MPO-oxidized HDL is dysfunctional in promoting endothelial repair compared to normal HDL. Proliferation assay, wound healing, and transwell migration experiments showed that MPO-oxidized HDL was associated with a reduced stimulation of endothelial cell (EC) proliferation and migration. In addition, we found that Akt and ERK1/2 phosphorylation in ECs was significantly lower when ECs were incubated with oxidized HDL compared with normal HDL. To further determine whether oxidized HDL diminished EC migration through the PI3K/Akt and MEK/ERK pathways, we performed experiments with inhibitors of both these pathways. The transwell experiments performed in the presence of these inhibitors showed that the migration capacity was reduced and the differences observed between normal HDL and oxidized HDL were diminished. Furthermore, to study the effects of oxidized HDL on endothelial cells in vivo, we performed a carotid artery electric injury model on nude mice injected with either normal or oxidized HDL. Oxidized HDL inhibited reendothelialization compared to normal HDL in vivo. These findings implicate a key role for MPO-oxidized HDL in the pathogenesis of cardiovascular disease.
authors: The Institute of Cardiovascular Sciences and Institute of Systems Biomedicine, School of Basic Medical Sciences; Key Laboratory of Molecular Cardiovascular Sciences, Ministry of Education; and Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Ministry of Health, Peking University Health Science Center, Beijing 100191, China.
authors: Bing
authors: B
authors: Pan
authors: Baoqi
authors: B
authors: Yu
authors: Hui
authors: H
authors: Ren
authors: Belinda
authors: B
authors: Willard
authors: Ling
authors: L
authors: Pan
authors: Lingyun
authors: L
authors: Zu
authors: Xiaoli
authors: X
authors: Shen
authors: Yijing
authors: Y
authors: Ma
authors: Xiuli
authors: X
authors: Li
authors: Chenguang
authors: C
authors: Niu
authors: Jinge
authors: J
authors: Kong
authors: Siyu
authors: S
authors: Kang
authors: Y
authors: Y
authors: Eugene Chen
authors: Subramaniam
authors: S
authors: Pennathur
authors: Lemin
authors: L
authors: Zheng
mesh_terms: D000818:Animals; D002318:Cardiovascular Diseases / Q000378:metabolism* / Q000503:physiopathology; D002384:Catalysis; D002465:Cell Movement / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D042783:Endothelial Cells / Q000187:drug effects / Q000378:metabolism; D004727:Endothelium / Q000254:growth & development* / Q000378:metabolism; D054879:Halogenation; D006801:Humans; D008075:Lipoproteins, HDL / Q000008:administration & dosage* / Q000737:chemistry / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000187:drug effects; D051379:Mice; D009566:Nitrates / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism; D010084:Oxidation-Reduction; D009195:Peroxidase / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism
chemical_list: D008075:Lipoproteins, HDL; D009566:Nitrates; D009195:Peroxidase; D051057:Proto-Oncogene Proteins c-akt