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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Katz, Howard Feng, Chunli Boyce, Joshua A. Lai, Juying Liu, Tao Garofalo, Denise Laidlaw, Tanya M. |
| Description | Author Affiliation: Liu T ( Department of Medicine, Harvard Medical School, Boston, MA 02115); Garofalo D ( Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA 02115); Feng C ( Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA 02115); Lai J ( Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Boston, MA 02115); Katz H ( Department of Medicine, Harvard Medical School, Boston, MA 02115); Laidlaw TM ( Department of Medicine, Harvard Medical School, Boston, MA 02115); Boyce JA ( Department of Medicine, Harvard Medical School, Boston, MA 02115) |
| Abstract | Cysteinyl leukotrienes (cysLTs) are bronchoconstricting lipid mediators that amplify eosinophilic airway inflammation by incompletely understood mechanisms. We recently found that LTC4, the parent cysLT, potently activates platelets in vitro and induces airway eosinophilia in allergen-sensitized and -challenged mice by a platelet- and type 2 cysLT receptor-dependent pathway. We now demonstrate that this pathway requires production of thromboxane A2 and signaling through both hematopoietic and lung tissue-associated T prostanoid (TP) receptors. Intranasal administration of LTC4 to OVA-sensitized C57BL/6 mice markedly increased the numbers of eosinophils in the bronchoalveolar lavage fluid, while simultaneously decreasing the percentages of eosinophils in the blood by a TP receptor-dependent mechanism. LTC4 upregulated the expressions of ICAM-1 and VCAM-1 in an aspirin-sensitive and TP receptor-dependent manner. Both hematopoietic and nonhematopoietic TP receptors were essential for LTC4 to induce eosinophil recruitment. Thus, the autocrine and paracrine functions of thromboxane A2 act downstream of LTC4/type 2 cysLT receptor signaling on platelets to markedly amplify eosinophil recruitment through pulmonary vascular adhesion pathways. The findings suggest applications for TP receptor antagonists in cases of asthma with high levels of cysLT production. |
| ISSN | 00221767 |
| e-ISSN | 15506606 |
| DOI | 10.4049/jimmunol.1402959 |
| Journal | The Journal of Immunology |
| Issue Number | 11 |
| Volume Number | 194 |
| Language | English |
| Publisher | The American Association of Immunologists |
| Publisher Date | 2015-06-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Aspirin Pharmacology Blood Platelets Immunology Cysteine Leukotriene C4 Leukotrienes Platelet Activation Allergens Animals Asthma Drug Therapy Bone Marrow Transplantation Bronchoalveolar Lavage Fluid Cytology Eosinophilia Blood Inflammation Intercellular Adhesion Molecule-1 Biosynthesis Leukotriene Antagonists Lung Mice Mice, Inbred C57bl Mice, Knockout Ovalbumin Receptors, Prostaglandin Genetics Metabolism Thromboxane A2 Vascular Cell Adhesion Molecule-1 Research Support, N.i.h., Extramural Discipline Immunology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Immunology and Allergy Immunology |
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