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Erschienen in: Heart and Vessels 1/2015

01.01.2015 | Original Article

Impact of lysophosphatidylcholine on survival and function of UEA-1+acLDL+ endothelial progenitor cells in patients with coronary artery disease

verfasst von: Seong Hun Hong, Hyun Hee Jang, So Ra Lee, Kyung Hye Lee, Jong Shin Woo, Jin Bae Kim, Woo-Shik Kim, Byung Il Min, Ki Ho Cho, Kwon Sam Kim, Xianwu Cheng, Weon Kim

Erschienen in: Heart and Vessels | Ausgabe 1/2015

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Abstract

Lysophosphatidylcholine (LPC) generated from oxidized low-density lipoprotein by lipoprotein-associated phospholipase A2 plays a key role in plaque inflammation and vulnerability. Endothelial progenitor cells (EPCs) can repair injured endothelium and exert anti-inflammatory effects of vulnerable plaque. We study the impact and mechanisms of LPC on UEA-1 and acLDL binding EPCs (UEA-1+acLDL+ EPCs). UEA-1+acLDL+ EPCs from coronary artery disease (CAD) patients were cultured and exposed to LPC at different concentrations and different timepoints. We determined the significant concentration (40 μM). UEA-1+acLDL+ EPCs were preincubated for 30 min with pravastatin (20 μM) with LY249002, a specific inhibitor of the Akt signaling pathway, and exposed for 24 h to LPC 40 μM. The survival, migration, adhesion, and proliferation of UEA-1+acLDL+ EPCs were assessed. To examine the mechanisms of LPC toxicity and pravastatin effects, phosphorylated Akt and endothelial nitric oxide synthase (eNOS) levels and the ratio of Bcl-2/Bax protein expression were assessed. LPC induced apoptosis and impaired migration and adhesion of UEA-1+acLDL+ EPCs significantly. The detrimental effects of LPC were attenuated by pravastatin. However, when UEA-1+acLDL+ EPCs were pretreated with pravastatin and LY249002, a specific inhibitor of the Akt signaling pathway, simultaneously, the beneficial effects of pravastatin were abolished. Furthermore, LPC suppressed Akt and eNOS phosphorylation and increased Bcl-2/Bax expression. The effects of LPC on Akt/eNOS and Bcl-2/Bax activity were reversed by pravastatin. In conclusion, LPC inhibited UEA-1+acLDL+ EPCs survival and impaired its functions, and these were attributable to inhibition of the Akt/eNOS and Bcl-2/Bax pathway. Pravastatin reversed the detrimental action of LPC. These findings suggest that LPC inhibition can be a possible strategy for CAD through EPC revitalization.
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Metadaten
Titel
Impact of lysophosphatidylcholine on survival and function of UEA-1+acLDL+ endothelial progenitor cells in patients with coronary artery disease
verfasst von
Seong Hun Hong
Hyun Hee Jang
So Ra Lee
Kyung Hye Lee
Jong Shin Woo
Jin Bae Kim
Woo-Shik Kim
Byung Il Min
Ki Ho Cho
Kwon Sam Kim
Xianwu Cheng
Weon Kim
Publikationsdatum
01.01.2015
Verlag
Springer Japan
Erschienen in
Heart and Vessels / Ausgabe 1/2015
Print ISSN: 0910-8327
Elektronische ISSN: 1615-2573
DOI
https://doi.org/10.1007/s00380-014-0473-z

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