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2017 ; 2017
(ä): 6395601
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Asymmetric Dimethylarginine Induced Apoptosis and Dysfunction of Endothelial
Progenitor Cells: Role of Endoplasmic Reticulum Stress Pathway
#MMPMID28589144
Ye S
; Zhou X
; Lin J
; Chen P
Biomed Res Int
2017[]; 2017
(ä): 6395601
PMID28589144
show ga
Asymmetric dimethylarginine (ADMA), an inhibitor of nitric oxide synthase, is a
novel risk factor of cardiovascular disease. Endothelial progenitor cells (EPCs)
bear typical endothelial characteristics and are thought to contribute to
neovascularization by providing new endothelial cells (ECs) after arterial
injury. Many studies have shown that ADMA can induce EPC apoptosis and
dysfunction, but the underlying mechanism is not well understood. EPCs from
umbilical cord blood were cultured in EGM-2 medium with particular growth factors
and supplemented with 10% fetal bovine serum. The cells were treated with
different concentrations of ADMA (5, 10, and 50??mol/L). Endoplasmic reticulum
(ER) stress marker levels were examined by western blot analysis. After 24-hour
incubation, ADMA induced apoptosis of EPCs and significantly decreased the
proliferation, migration, and vasculogenesis capacity of EPCs. We also found that
ADMA treatment activated phosphorylated protein kinase RNA-activated-like ER
kinase (PERK), a stress sensor protein in the endoplasmic reticulum (ER). The
activated PERK induced 78?kDa glucose-regulated protein (GRP-78) and C/EBP
homologous protein (CHOP) expression. Additionally, the inhibition of the ER
stress pathway by Salubrinal (a specific ER stress inhibitor) can attenuate
ADMA-induced apoptosis of EPCs. Overall, these observations indicate that ADMA
may induce the apoptosis and dysfunction of EPCs through the ER stress pathway.