Palmitic acid promotes endothelial progenitor cells apoptosis via p38 and JNK mitogen-activated protein kinase pathways.

Abstract:

OBJECTIVE:Recent studies have demonstrated that palmitic acid (PA) could regulate endothelial progenitor cells (EPCs) function (migration, proliferation, survival and angiogenesis) via various signal pathways, but the effect of PA on EPCs apoptosis and associated mechanisms are still elusive. METHODS:The human EPCs were obtained by Ficoll density gradient centrifugation and cultured in M199 medium containing rh-VEGF (30ng/mL), rh-b-FGF (6ng/mL) and 10% fetal bovine serum for 7 days. The adhesive EPCs were harvested, then challenged with different concentrations of PA (ranging from 0 to 800mumol/L) for 48h and 400 micromol/L PA for different time periods (ranging from 0 to 60h) after 12h synchronization with serum-free medium. The EPCs apoptosis was determined by flow cytometry, expression of caspase-3, phosphorylated ERK1/2, JNK and p38 mitogen-activated protein kinase (MAPK) were quantified by Western blot. The effect of PA on caspase-3 activity in the absence or presence of specific MAPK pathway inhibitors was determined by colorimetry. RESULTS:PA increased EPCs apoptosis in a dose- and time-dependent manner, upregulated phosphorylated-p38 and -JNK, caspase-3 expression of EPCs while ERK expression was not affected. PA-induced EPCs apoptosis could be partly ameliorated by p38 inhibitor SB203580 and JNK inhibitor SP600125, but not by ERK1/2 inhibitor PD98059. CONCLUSION:These findings suggested that PA promoted EPCs apoptosis via p38 and JNK MAPKs pathways.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Jiang H,Liang C,Liu X,Jiang Q,He Z,Wu J,Pan X,Ren Y,Fan M,Li M,Wu Z

doi

10.1016/j.atherosclerosis.2009.10.032

subject

Has Abstract

pub_date

2010-05-01 00:00:00

pages

71-7

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(09)00906-X

journal_volume

210

pub_type

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