Abstract
The ethanol extract of the flower of P. vulgaris var. lilacina (EEPV) has been used traditionally as an antiinflammatory agent in many countries. Inducers of heme oxygenase-1 (HO-1) reduce high mobility group box 1 (HMGB1), a late phase cytokine, in sepsis. Although EEPV has been used as an antiinflammatory agent, no report is available as to whether it modifies HMGB1 in sepsis due to HO-1 induction. It was found that EEPV increased HO-1 protein expression in RAW 264.7 cells, which was significantly inhibited by LY294002, but not PD98059, SB203580 or SP600125. In addition, EEPV activated NF-E2-related factor (Nrf2) to move from the cytosol to the nucleus, and EEPV-induced HO-1 and activation of ARE-luciferase activity were significantly reduced by siNrf2 transfection and LY294002 but not SB203508. EEPV also significantly inhibited NF-κB luciferase activity, and decreased both iNOS/NO and COX-2/PGE(2) production in lipopolysaccharide (LPS)-stimulated macrophages which was reversed by siHO-1 RNA transfection. Importantly, EEPV inhibited HMGB1 release in LPS-activated macrophages in a PI3K-sensitive manner and reduced serum HMGB1 level and lung HMGB1 expression in cecal ligation and puncture (CLP)-induced septic mice. It is concluded that EEPV induces HO-1 expression through PI3K/Nrf2 signal pathways, which may be beneficial for the treatment of sepsis due to a reduction of HMGB1 release.
Copyright © 2011 John Wiley & Sons, Ltd.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Anthracenes / pharmacology
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Cecum / injuries*
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Cecum / pathology
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Cell Line
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Cell Survival
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Chromones / pharmacology
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Cyclooxygenase 2 / metabolism
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Disease Models, Animal
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Drug Evaluation, Preclinical
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Enzyme Activation
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Enzyme Induction
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Ethanol
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Flavonoids / pharmacology
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Flowers / chemistry
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Genetic Vectors
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HMGB1 Protein / antagonists & inhibitors*
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HMGB1 Protein / blood
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Heme Oxygenase-1 / antagonists & inhibitors
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Heme Oxygenase-1 / metabolism*
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Imidazoles / pharmacology
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Lipopolysaccharides / adverse effects
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Lung / pathology
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Macrophages / drug effects
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Macrophages / enzymology
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Male
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Membrane Proteins / antagonists & inhibitors
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Membrane Proteins / metabolism*
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Mice
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Mice, Inbred BALB C
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Morpholines / pharmacology
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NF-E2-Related Factor 2 / metabolism
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NF-kappa B / metabolism
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Nitric Oxide Synthase Type II / antagonists & inhibitors
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Nitric Oxide Synthase Type II / metabolism
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Plant Extracts / pharmacology*
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Protein Transport
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Prunella / chemistry*
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Pyridines / pharmacology
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Sepsis / pathology
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Signal Transduction
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Transfection
Substances
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Anthracenes
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Chromones
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Flavonoids
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HMGB1 Protein
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Imidazoles
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Lipopolysaccharides
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Membrane Proteins
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Morpholines
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NF-E2-Related Factor 2
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NF-kappa B
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Nfe2l2 protein, mouse
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Plant Extracts
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Pyridines
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pyrazolanthrone
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2-(4-morpholinyl)-8-phenyl-4H-1-benzopyran-4-one
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Ethanol
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Nitric Oxide Synthase Type II
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Nos2 protein, mouse
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Heme Oxygenase-1
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Hmox1 protein, mouse
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Ptgs2 protein, mouse
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Cyclooxygenase 2
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SB 203580
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2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one