Volume 54, Issue 7 pp. 2096-2108
Research Article

Differential survival of leukocyte subsets mediated by synovial, bone marrow, and skin fibroblasts: Site-specific versus activation-dependent survival of T cells and neutrophils

Andrew Filer

Andrew Filer

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Greg Parsonage

Greg Parsonage

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Emily Smith

Emily Smith

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Chloe Osborne

Chloe Osborne

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Andrew M. C. Thomas

Andrew M. C. Thomas

Royal Orthopaedic Hospital, Birmingham, UK

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S. John Curnow

S. John Curnow

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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G. Ed Rainger

G. Ed Rainger

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Karim Raza

Karim Raza

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

Drs. Buckley, Raza, and Salmon have received honoraria and grants (more than $10,000) from Wyeth.

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Gerard B. Nash

Gerard B. Nash

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Janet Lord

Janet Lord

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

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Mike Salmon

Mike Salmon

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

Drs. Buckley, Raza, and Salmon have received honoraria and grants (more than $10,000) from Wyeth.

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Christopher D. Buckley

Corresponding Author

Christopher D. Buckley

MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK

Drs. Buckley, Raza, and Salmon have received honoraria and grants (more than $10,000) from Wyeth.

Division of Immunity and Infection, Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham B15 2TT, UKSearch for more papers by this author
First published: 27 June 2006
Citations: 83

Abstract

Objective

Synovial fibroblasts share a number of phenotype markers with fibroblasts derived from bone marrow. In this study we investigated the role of matched fibroblasts obtained from 3 different sources (bone marrow, synovium, and skin) to test the hypothesis that synovial fibroblasts share similarities with bone marrow–derived fibroblasts in terms of their ability to support survival of T cells and neutrophils.

Methods

Matched synovial, bone marrow, and skin fibroblasts were established from 8 different patients with rheumatoid arthritis who were undergoing knee or hip surgery. Resting or activated fibroblasts were cocultured with either CD4 T cells or neutrophils, and the degree of leukocyte survival, apoptosis, and proliferation were measured.

Results

Fibroblasts derived from all 3 sites supported increased survival of CD4 T cells, mediated principally by interferon-β. However, synovial and bone marrow fibroblasts shared an enhanced site-specific ability to maintain CD4 T cell survival in the absence of proliferation, an effect that was independent of fibroblast activation or proliferation but required direct T cell–fibroblast cell contact. In contrast, fibroblast-mediated neutrophil survival was less efficient, being independent of the site of origin of the fibroblast but dependent on prior fibroblast activation, and mediated solely by soluble factors, principally granulocyte–macrophage colony-stimulating factor.

Conclusion

These results suggest an important functional role for fibroblasts in the differential accumulation of leukocyte subsets in a variety of tissue microenvironments. The findings also provide a potential explanation for site-specific differences in the pattern of T cell and neutrophil accumulation observed in chronic inflammatory diseases.

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