期刊
JOURNAL OF IMMUNOLOGY
卷 184, 期 3, 页码 1292-1299出版社
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.0900808
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资金
- Canadian Institutes of Health Research
- Heart and Stroke Foundation of British Columbia and Yukon
- AllerGen Network Centre of Excellence
- Michael Smith Foundation for Health Research
- Fonds de Recherche en Sante do Quebec
- Center for Blood Research at the University of British Columbia
- Canadian Institutes of Health Research/Michael Smith Foundation for Health Research Transplantation Training Program
- Multiple Sclerosis Society of Canada
CD34 is a cell surface sialomucin expressed by hematopoietic precursors, eosinophils, mast cells, and vascular endothelia and is suggested to play an integral role in mucosal inflammatory responses. Although Cd34(-/-) mice have normal hematopoietic cell subsets in peripheral tissues at steady state, they exhibit a cell recruitment defect when challenged, offering a unique opportunity to distinguish between local inflammatory cell proliferation and peripheral recruitment in disease. Autoimmune arthritis is an inflammatory disease dependent on hematopoietic infiltration, and in this study, we have examined the role of CD34 in disease development and progression. Using an autoimmune serum transfer model, arthritis was induced in C57BL/6 wild-type and Cd34(-/-) mice. Surprisingly, we found that Cd34(-/-) mice were more susceptible to arthritis than wild-type mice. We examined mast cell-transplanted, eosinophil-deficient, and bone marrow-chimeric mice to determine the role of CD34 expression on disease progression. These experiments excluded CD34-deficient mast cells, eosinophils, or hematopoietic cells as the cause of the exacerbated disease. Further study demonstrated that Cd34(-/-) mice exhibit increased vascular leakage at onset of disease and in response to TNF, which correlated with a subsequent increase in disease severity. We conclude that loss of CD34 expression leads to increased vascular permeability in the joints at onset of disease, leading to exacerbated arthritic disease in Cd34(-/-) mice. The Journal of Immunology, 2010, 184: 1292-1299.
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