Chronic allergen challenge induces pulmonary extramedullary hematopoiesis
Autor: | Xiao Na Ge, Savita P. Rao, Bit Na Kang, Nooshin S. Bahaie, P. Sriramarao, M. Reza Hosseinkhani, Terlika S. Pandit |
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Rok vydání: | 2011 |
Předmět: |
Pulmonary and Respiratory Medicine
Receptors CXCR4 Clinical Biochemistry Inflammation Antigens CD34 Biology Article Cell Line Mice Cell Movement Eosinophilia medicine Animals Progenitor cell Molecular Biology Lung Myeloid Progenitor Cells Multipotent Stem Cells Precursor Cells B-Lymphoid Eosinophil respiratory system Allergens medicine.disease respiratory tract diseases Extramedullary hematopoiesis Eosinophils Haematopoiesis medicine.anatomical_structure Multipotent Stem Cell Hematopoiesis Extramedullary Immunology Bone marrow medicine.symptom |
Zdroj: | Experimental lung research. 37(5) |
ISSN: | 1521-0499 |
Popis: | Allergic inflammation is associated with increased generation and trafficking of inflammatory cells, especially eosinophils, to sites of inflammation. The effect of acute versus chronic airway allergen challenge on hematopoietic activity in the bone marrow (BM) and lungs was investigated using murine models of allergic airway inflammation. Acute allergen challenge induced proliferation of BM cells and significantly increased generation of eosinophil, but not multi-potent, granulocyte-macrophage (GM) or B-lymphocyte progenitor cells. However, no hematopoietic activity was observed in the lungs. With chronic challenge, BM cells failed to proliferate, but exhibited increased capacity to generate multi-potent as well as eosinophil, GM and B-lymphocyte progenitors. In addition, increased generation of eosinophil- and GM-specific progenitors was observed in the lungs. Although no differences were observed in their ability to roll on BM endothelium in vitro or in vivo, CD34-enriched hematopoietic/stem progenitor cells (HSPC) from chronic-, but not acute-, challenged mice demonstrated reduced migration across BM endothelial cells associated with decreased CXCR4 expression. Overall, these studies demonstrate that chronic allergen exposure can alter BM homing due to decreased transendothelial migration enabling non-interacting HSPCs to egress out of the BM and recruit to sites of inflammation such as the airways, resulting in extramedullary hematopoiesis. |
Databáze: | OpenAIRE |
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