Cobalt Protoporphyrin Inhibition of Lipopolysaccharide or Lipoteichoic Acid-Induced Nitric Oxide Production via Blocking c-Jun N-Terminal Kinase Activation and Nitric Oxide Enzyme Activity

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题名:	Cobalt Protoporphyrin Inhibition of Lipopolysaccharide or Lipoteichoic Acid-Induced Nitric Oxide Production via Blocking c-Jun N-Terminal Kinase Activation and Nitric Oxide Enzyme Activity
作者:	陳彥州 Hui-Yi. Lin#;Shing-Chuan Shen#;Cheng-Wei Lin;Ming-Shun Wu;Yen-Chou Chen*
贡献者:	醫學科學研究所
日期:	2009
上传时间:	2009-08-25 09:55:32 (UTC+8)
摘要:	In the present study, low doses (0.5, 1, and 2 microM) of cobalt protoporphyrin (CoPP), but not ferric protoporphyrin (FePP) or tin protoporphyrin (SnPP), significantly inhibited lipopolysaccharide (LPS) or lipoteichoic acid (LTA)-induced inducible nitric oxide (iNOS) and nitric oxide (NO) production with an increase in heme oxygenase 1 (HO-1) protein in RAW264.7 macrophages under serum-free conditions. IC(50) values of CoPP inhibition of NO and iNOS protein individually induced by LPS and LTA were around 0.25 and 1.7 microM, respectively. This suggests that CoPP is more sensitive at inhibiting NO production than iNOS protein in response to separate LPS and LTA stimulation. NO inhibition and HO-1 induction by CoPP were blocked by the separate addition of fetal bovine serum (FBS) and bovine serum albumin (BSA). Decreasing iNOS/NO production and increasing HO-1 protein by CoPP were observed with CoPP pretreatment, CoPP co-treatment, and CoPP post-treatment with LPS and LTA stimulation. LPS- and LTA-induced NOS/NO productions were significantly suppressed by the JNK inhibitor, SP600125, but not by the ERK inhibitor, PD98059, through a reduction in JNK protein phosphorylation. Transfection of a dominant negative JNK plasmid inhibited LPS- and LTA-induced iNOS/NO production and JNK protein phosphorylation, suggesting that JNK activation is involved in LPS- and LTA-induced iNOS/NO production. Additionally, CoPP inhibition of LPS- and LTA-induced JNK, but not ERK, protein phosphorylation was identified in RAW264.7 cells. Furthermore, CoPP significantly reduced NO production in a cell-mediated, but not cell-free, iNOS enzyme activity assay accompanied by HO-1 induction. However, attenuation of HO-1 protein stimulated by CoPP via transfection of HO-1 siRNA did not affect NO's inhibition of CoPP against LPS stimulation. CoPP effectively suppressing LPS- and LTA-induced iNOS/NO production through blocking JNK activation and iNOS enzyme activity via a HO-1 independent manner is first demonstrated herein.
關聯:	Chem-Biol Interact.
数据类型:	article
显示于类别:	[醫學科學研究所] 期刊論文

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