| β-Sitosterol down-regulates some pro-inflammatory signal transduction pathways by increasing the activity of tyrosine phosphatase SHP-1 in J774A.1 murine macrophages. | |
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MedLine Citation:
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PMID: 21356343 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objective of the present study was to examine the anti-inflammatory effects of β-sitosterol (SIT), the most common phytosterol in the diet, and to investigate its involvement in NF-κB and STAT1 pathways as potential mechanisms. In addition, the activity of the phosphatase SHP-1 as a negative modulator to these pathways, was investigated. Utilizing murine J774A.1 macrophages, cells were treated with various physiological concentrations of SIT and stimulated with LPS (100ng/ml) for 6h. Results indicate that 1 and 16μM SITs increased SHP-1 activity by 300% and 200%, respectively. Similar results were obtained using western blot analysis. Additionally, we observed reductions in the release of some pro-inflammatory cytokines and chemokines as well as an increase in anti-inflammatory IL-10 with SIT treatments. The results also demonstrate the inhibition of STAT1 with SIT treatment. Moreover, translocation of NF-κB to the nucleus was inhibited with SIT as indicated by decreased phosphorylation and the use of ImageStream cytometry. In conclusion, the present study demonstrates the anti-inflammatory effect on macrophages by inactivating STAT1 and NF-κB, which could be mediated by the activation of SHP-1. |
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Authors:
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Michael Valerio; Atif B Awad |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-2-25 |
Journal Detail:
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Title: International immunopharmacology Volume: - ISSN: 1878-1705 ISO Abbreviation: - Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2011-3-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100965259 Medline TA: Int Immunopharmacol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011. Published by Elsevier B.V. |
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