| αVβ3 integrin regulates macrophage inflammatory responses via PI3 kinase/Akt-dependent NF-κB activation. | |
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MedLine Citation:
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PMID: 20672329 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Controlling macrophage responses to pathogenic stimuli is critical for prevention of and recovery from the inflammatory state associated with the pathogenesis of many diseases. The adhesion receptor αVβ3 integrin is thought to be an important receptor that regulates macrophage differentiation and macrophage responses to external signaling, but it has not been previously identified as a contributor to macrophage-related inflammation. Using an in vitro model of human blood monocytes (Mo) and monocyte-derived macrophages (MDMs) we demonstrate that αVβ3 ligation results in sustained increases of the transcription factor NF-κB DNA-binding activity, as compared with control isotype-matched IgG(1). Activation of NF-κB parallels the increase of NF-κB-dependent pro-inflammatory cytokine mRNA expression in MDMs isolated from individual donors, for example, TNF-α (8- to 28-fold), IL-1β (15- to 30-fold), IL-6 (2- to 4-fold), and IL-8 (5- to 15-fold) whereas there is more than a 10-fold decrease in IL-10 mRNA level occurs. Upon ligation of the αVβ3 receptor, treatment with TNF-α (10 ng/ml) or LPS (200 ng/ml, 1,000 EU) results in the enhanced and synergistic activation of NF-κB and LPS-induced TNF-α secretion. As additional controls, an inhibitor of αVβ3 integrin, cyclic RGD (10 µg/ml; IC(50) = 7.6 µM), attenuates the effects of αVβ3 ligation, and the natural ligand of αVβ3 integrin, vitronectin, reproduces the effects of αVβ3 activation by an immobilizing anti-αVβ3 integrin mAb. We hypothesize that αVβ3 activation can maintain chronic inflammatory processes in pathological conditions and that the loss of αVβ3 ligation will allow macrophages to escape from the inflammatory state. |
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Authors:
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Alexander S Antonov; Galina N Antonova; David H Munn; Nahid Mivechi; Rudolf Lucas; John D Catravas; Alexander D Verin |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of cellular physiology Volume: 226 ISSN: 1097-4652 ISO Abbreviation: J. Cell. Physiol. Publication Date: 2011 Feb |
Date Detail:
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Created Date: 2010-11-30 Completed Date: 2011-01-06 Revised Date: 2012-03-14 |
Medline Journal Info:
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Nlm Unique ID: 0050222 Medline TA: J Cell Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 469-76 Citation Subset: IM |
Copyright Information:
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© 2010 Wiley-Liss, Inc. |
Affiliation:
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Vascular Biology Center, Medical College of Georgia, Augusta, Georgia 30912, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cytokines / genetics, immunology Enzyme Inhibitors / metabolism Humans Inflammation / immunology Integrin alphaVbeta3 / immunology* Macrophages / cytology, immunology*, metabolism Monocytes / cytology, immunology, metabolism NF-kappa B / genetics, metabolism* Phosphatidylinositol 3-Kinases / metabolism* Proto-Oncogene Proteins c-akt / metabolism* Signal Transduction Tumor Necrosis Factor-alpha / genetics, immunology, metabolism |
| Grant Support | |
ID/Acronym/Agency:
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R01 CA062130-17/CA/NCI NIH HHS; R01 CA132640-12/CA/NCI NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Cytokines; 0/Enzyme Inhibitors; 0/Integrin alphaVbeta3; 0/NF-kappa B; 0/Tumor Necrosis Factor-alpha; EC 2.7.1.-/Phosphatidylinositol 3-Kinases; EC 2.7.11.1/Proto-Oncogene Proteins c-akt |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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