4.5 Article

Bioactive products generated by Group V sPLA2 hydrolysis of LDL activate macrophages to secrete pro-inflammatory cytokines

期刊

CYTOKINE
卷 50, 期 1, 页码 50-57

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cyto.2009.12.009

关键词

Atherosclerosis; Inflammation; Lipoprotein modification; Tumor necrosis factor-alpha; NF kappa B

资金

  1. National Institutes of Health [P01 HL080100]
  2. NIHGM [50388-18]
  3. NCRRRP [20021594]

向作者/读者索取更多资源

7Objective: Previous studies have established that hydrolysis of LDL by Group V secretory phospholipase A(2) (CV sPLA(2)) generates a modified particle capable of inducing macrophage foam cell formation. The aim of the present study was to determine whether GV sPLA(2)-hydrolyzed LDL (GV-LDL) produces pro-atherogenic effects in macrophages independent of cholesterol accumulation. Methods and results: J-774 cells incubated with GV-LDL produced more TNF-alpha and IL-6 compared to cells incubated with control-LDL. Indirect immunofluorescence showed that GV-LDL but not control-LDL induced nuclear translocation of NF kappa B. Inhibitors of NF kappa B activation, effectively blocked cytokine production induced by GV-LDL. Control-LDL and GV-LDL were separated from albumin present in reaction mixtures by ultracentrifugation. The albumin fraction derived from GV-LDL contained 80% of the FFA generated and was more potent than the re-isolated GV-LDL in inducing pro-inflammatory cytokine secretion. Linoleic acid (18:2) and oleic acid (18:1) were the most abundant FFAs generated, whereas newly formed lyso-PCs contained 14:0 (myristic), 16:1 (palmitic), and 18:2 fatty acyl groups. Experiments with synthetic FFA showed that 18:1 induced J-774 cells to secrete TNF-alpha and IL-6. Conclusions: These results indicate that in addition to promoting atherosclerotic lipid accumulation in macrophages, GV sPLA(2) hydrolysis of LDL leads to activation of NF kappa B, a key regulator of inflammation. (C) 2010 Elsevier Ltd. All rights reserved.

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