alexa Characterization of DC-STAMP+ Cells in Human Bone Marrow
ISSN: 2572-4916

Journal of Bone Research
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Research Article

Characterization of DC-STAMP+ Cells in Human Bone Marrow

Yahui Grace Chiu*Christopher T Ritchlin*

Allergy/Immunology and Rheumatology Division, School of Medicine and Dentistry, University of Rochester, 601 Elmwood Ave., Rochester, NY 14642, USA

*Corresponding Author:
Yahui Grace Chiu
Allergy/Immunology and Rheumatology Division and Center for Musculoskeletal Research
Box 695, School of Medicine and Dentistry
University of Rochester, 601 Elmwood Ave.
Rochester, NY 14642, USA
Tel: 585-273-2125
Fax: 585-442-3214
E-mail: [email protected]
*Corresponding Author:
Christopher T Ritchlin
Allergy/Immunology and Rheumatology Division and Center for Musculoskeletal Research
Box 695, School of Medicine and Dentistry
University of Rochester, 601 Elmwood Ave.
Rochester, NY 14642, USA
E-mail: [email protected]

Received May 21, 2013; Accepted June 17, 2013; Published July 19, 2013

Citation: Chiu YG, Ritchlin CT (2013) Characterization of DC-STAMP+ Cells in Human Bone Marrow. J Bone Marrow Res 1:127. doi:10.4172/2329-8820.1000127

Copyright: © 2013 Chiu YG, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

 

Abstract

Osteoclasts (OC), specialized cells derived from monocytes, maintain skeletal homeostasis under normal conditions but degrade bone in patients with rheumatoid (RA) and psoriatic arthritis (PsA). Monocytes initially develop in the bone marrow (BM), circulate in peripheral blood, and differentiate into distinct cell types with diverse functions. Imaging studies in (RA) patients and murine arthritis models demonstrate that bone marrow edema detected on MRI is the result of enhanced myelopoiesis which precedes the development of bone erosions detected on plain radiographs several years later. A major knowledge gap, however, is whether OC develop in the BM and circulate to the joint and if the differentiation to OC takes place in the joint space in response to differentiation signals such as RANKL and TNF. We have previously demonstrated that osteoclast precursors (OCP) are increased in the circulaton of patients with RA and PsA. We showed that DC-STAMP (Dendritic Cell-Specific Transmembrane protein), a 7-pass transmembrane protein expressed on the surface of monocytes, is essential for cell-to-cell fusion during OC differentiation and is a valid biomarker of OCP. Herein, we examined OCP in human bone marrow and identified one novel subset of DC-STAMP+CD45intermediate monocytes which was absent in the blood. We also found that OCPs reside in human BM with a higher frequency than in the peripheral blood. These findings support the notion that the BM is a major reservoir of circulating OCPs. In addition, we demonstrated that a higher frequency of DC-STAMP+ cells in the BM have detectable intracellular IFN-γ, IL-4 and IL-17A than DC-STAMP+ cells circulating in the peripheral blood. Finally, the frequency of DC-STAMP+ monocytes and T cells is signficantly higher in PsA BM compared to healthy controls, suggesting an enhanced myelopoiesis is a central event in inflammatory arthritis.

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