alexa Synovium in the Transitional Zone between the Articular Cartilage and the Synovial Membrane Contains Stem Cells and has Greater Chondrogenic Differentiation Potential than Synovium in Other Locations | Abstract
ISSN: 2161-1149

Rheumatology: Current Research
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Research Article

Synovium in the Transitional Zone between the Articular Cartilage and the Synovial Membrane Contains Stem Cells and has Greater Chondrogenic Differentiation Potential than Synovium in Other Locations

Nobuo Adachi*, Ayato Miyamoto, Masataka Deie, Atsuo Nakamae, Tomoyuki Nakasa and Mitsuo Ochi

Department of Orthopaedic Surgery, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan

*Corresponding Author:
Nobuo Adachi
Department of Orthopaedic Surgery
Graduate School of Biomedical Sciences
Hiroshima University, 1-2-3 Kasumi
Minami-ku, Hiroshima, 734-8551, Japan
Phone: +81-82-257-5231
Fax: +81-82- 257-5234
E-mail: [email protected]

Received date: December 06, 2011; Accepted date: January 26, 2012; Published date: February 10, 2012

Citation: Adachi N, Miyamoto A, Deie M, Nakamae A, Nakasa T, et al. (2012) Synovium in the Transitional Zone between the Articular Cartilage and the Synovial Membrane Contains Stem Cells and has Greater Chondrogenic Differentiation Potential than Synovium in Other Locations. Rheumatology S3:001. doi: 10.4172/2161-1149.S3-001

Copyright: © 2012 Adachi N, 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

Purpose: There were two aims of the present study. (i) to determine differences in chondrogenic potential between synovial cells located in the transitional zone between the articular cartilage and the synovial membrane and those cells in other locations and (ii) to determine the location of mesenchymal stem cells in the synovium. Methods: Synovium was obtained from two different locations in 8-week-old male Sprague-Dawley rats. In Group A, the synovium was harvested from the transitional zone between the articular cartilage and the synovial membrane in the femoral condyle. In Group B, the synovium was harvested from an area 5 mm medial to the transitional zone of the femoral condyle. Synovial cells in both groups were isolated and cultured in monolayer culture system and the proliferation of cells in the first passage was compared between Groups A and B. In addition, passage 3 cells were pellet-cultured to induce chondrogenesis for the evaluation of the chondrogenic potential of the synovial cells. The expression of anti-ATP-binding cassette G-subfamily member 2 (ABCG2), a mesenchymal stem cell marker, was assessed using a real-time polymerase chain reaction in both groups. In a related procedure, both knees of 8-week-old male mice were harvested and cut axially. The synovium in the transitional zone between the cartilage and synovial membrane was examined immunohistochemically by staining with an ABCG2 monoclonal antibody. Results: The synovial cells in Group A demonstrated greater proliferation potential than those in Group B. Synovial cells derived from Groups A showed greater chondrogenic differentiation potential than those in B with respect to pellet size or the intensity of staining with toluidine blue. ABCG-2 expression was significantly higher in Group A than in Group B and ABCG2-stained cells were more prevalent in the synovium of the transitional zone than in the synovium located in other locations. Conclusion: The synovium in the transitional zone between the articular cartilage and the synovial membrane contains mesenchymal stem cells and has a greater chondrogenic differentiation potential than synovium located in other sites.

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