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. Copyright 2010. Published by Elsevier Ireland Ltd.
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 JNKMAPKs pathways. Copyright 2010. Published by Elsevier Ireland Ltd.
Authors: Renu Srivastava; Zhaoxia Li; Giulia Russo; Jie Tang; Ran Bi; Usha Muppirala; Sivanandan Chudalayandi; Andrew Severin; Mingze He; Samuel I Vaitkevicius; Carolyn J Lawrence-Dill; Peng Liu; Ann E Stapleton; Diane C Bassham; Federica Brandizzi; Stephen H Howell Journal: Plant Cell Date: 2018-05-25 Impact factor: 11.277
Authors: Giovanni Ferrari; Vitaly Terushkin; Martin J Wolff; Xiaodong Zhang; Cristina Valacca; Paolo Poggio; Giuseppe Pintucci; Paolo Mignatti Journal: Mol Cancer Res Date: 2012-04-20 Impact factor: 5.852