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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Aziz, Monowar Yang, Weng-Lang Jacob, Asha Wang, Ping Matsuda, Akihisa |
| Description | Country affiliation: United States Author Affiliation: Aziz M ( Center for Immunology and Inflammation, Feinstein Institute for Medical Research, Manhasset, NY 11030, USA.) |
| Abstract | Excessive neutrophil infiltration to the lungs is a hallmark of acute lung injury (ALI). Milk fat globule epidermal growth factor-factor 8 (MFG-E8) was originally identified for phagocytosis of apoptotic cells. Subsequent studies revealed its diverse cellular functions. However, whether MFG-E8 can regulate neutrophil function to alleviate inflammation is unknown. We therefore aimed to reveal MFG-E8 roles in regulating lung neutrophil infiltration during ALI. To induce ALI, C57BL/6J wild-type (WT) and Mfge8(-/-) mice were intratracheally injected with LPS (5 mg/kg). Lung tissue damage was assessed by histology, and the neutrophils were counted by a hemacytometer. Apoptotic cells in lungs were determined by TUNEL, whereas caspase-3 and myeloperoxidase activities were assessed spectrophotometrically. CXCR2 and G protein-coupled receptor kinase 2 expressions in neutrophils were measured by flow cytometry. Following LPS challenge, Mfge8(-/-) mice exhibited extensive lung damage due to exaggerated infiltration of neutrophils and production of TNF- , MIP-2, and myeloperoxidase. An increased number of apoptotic cells was trapped into the lungs of Mfge8(-/-) mice compared with WT mice, which may be due to insufficient phagocytosis of apoptotic cells or increased occurrence of apoptosis through the activation of caspase-3. In vitro studies using MIP-2-mediated chemotaxis revealed higher migration of neutrophils of Mfge8(-/-) mice than those of WT mice via increased surface exposures to CXCR2. Administration of recombinant murine MFG-E8 reduces neutrophil migration through upregulation of GRK2 and downregulation of surface CXCR2 expression. Conversely, these effects could be blocked by anti- (v) integrin Abs. These studies clearly indicate the importance of MFG-E8 in ameliorating neutrophil infiltration and suggest MFG-E8 as a novel therapeutic potential for ALI. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| DOI | 10.4049/jimmunol.1200262 |
| Journal | The Journal of Immunology |
| Issue Number | 1 |
| Volume Number | 189 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2012-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Acute Lung Injury Immunology Therapy Antigens, Surface Physiology Down-regulation Glycolipids Glycoproteins Neutrophil Infiltration Receptors, Interleukin-8b Antagonists & Inhibitors Biosynthesis Pathology Animals Genetics Apoptosis Regulatory Proteins Deficiency Disease Models, Animal Inflammation Mediators Mice Mice, Inbred C57bl Mice, Knockout Milk Proteins Recombinant Proteins Administration & Dosage Therapeutic Use Research Support, N.i.h., Extramural Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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