Induction of heme oxygenase-1 by Macleaya cordata extract and its constituent sanguinarine in RAW264.7 cells
| Autor: | Jitka Ulrichová, Eva Orolinová, Jiri Vrba |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Transcriptional Activation
HMOX1 Cell Survival NF-E2-Related Factor 2 p38 mitogen-activated protein kinases Biology Antioxidants Cell Line chemistry.chemical_compound Mice Alkaloids Thioredoxins Papaveraceae Drug Discovery Animals Humans Sanguinarine RNA Messenger Medicine Chinese Traditional Pharmacology Benzophenanthridines Macleaya cordata Plants Medicinal Kinase Plant Extracts Alkaloid General Medicine biology.organism_classification Isoquinolines Up-Regulation Heme oxygenase Chelerythrine chemistry Biochemistry Gene Expression Regulation Hepatocytes Heme Oxygenase-1 Signal Transduction |
| Zdroj: | Fitoterapia. 83(2) |
| ISSN: | 1873-6971 |
| Popis: | Macleaya cordata (plume poppy) is used in traditional Chinese medicine for its anti-inflammatory and antibacterial activities. In this study, we examined whether M. cordata extract and/or its major alkaloid constituents, protopine, allocryptopine, sanguinarine and chelerythrine activate the Nrf2 signalling pathway which regulates the expression of cytoprotective enzymes including heme oxygenase-1 (HO-1) and thioredoxin 1. In murine macrophage RAW264.7 cells, M. cordata extract increased both mRNA and protein levels of HO-1. Of the alkaloids examined, only sanguinarine appeared to be responsible for these effects. At the concentration of 2 μM, sanguinarine induced nuclear accumulation of Nrf2, increased the expression of Hmox1 gene encoding HO-1 and elevated HO-1 protein levels. Sanguinarine-induced Hmox1 mRNA expression was suppressed by SB203580, a pharmacologic inhibitor of p38 mitogen-activated protein kinases (p38 MAPKs). The upregulation of HO-1 in RAW264.7 cells by sanguinarine was, however, accompanied by decrease in cell viability. Nonetheless, sanguinarine at micromolar, non-cytotoxic concentrations elevated protein levels of HO-1 and thioredoxin 1 in primary cultures of human hepatocytes. We conclude that sanguinarine may, under appropriate conditions, increase the capacity of the enzymatic antioxidant defence system via activation of the p38 MAPK/Nrf2 pathway. |
| Databáze: | OpenAIRE |
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