RT Journal Article
SR Electronic
T1 Quantification of Cells Expressing Mesenchymal Stem Cell Markers in Healthy and Osteoarthritic Synovial Membranes
JF The Journal of Rheumatology
JO J Rheumatol
FD The Journal of Rheumatology
SP 339
OP 349
DO 10.3899/jrheum.100614
VO 38
IS 2
A1 TAMARA HERMIDA-GÓMEZ
A1 ISAAC FUENTES-BOQUETE
A1 MARIA JOSÉ GIMENO-LONGAS
A1 EMMA MUIÑOS-LÓPEZ
A1 SILVIA DÍAZ-PRADO
A1 FRANCISCO JAVIER de TORO
A1 FRANCISCO JAVIER BLANCO
YR 2011
UL http://www.jrheum.org/content/38/2/339.abstract
AB Objective. To quantify cells expressing mesenchymal stem cell (MSC) markers in synovial membranes from human osteoarthritic (OA) and healthy joints. Methods. Synovial membranes from OA and healthy joints were digested with collagenase and the isolated cells were cultured. Synovial membrane-derived cells were phenotypically characterized for differentiation experiments using flow cytometry to detect the expression of mesenchymal markers (CD29, CD44, CD73, CD90, CD105, CD117, CD166, and STRO-1) and hematopoietic markers (CD34 and CD45). Chondrogenesis was assessed by staining for proteoglycans and collagen type II, adipogenesis by using a stain for lipids, and osteogenesis by detecting calcium deposits. Coexpression of CD44, CD73, CD90, and CD105 was determined using immunofluorescence. Results. Cells expressing MSC markers were diffusely distributed in OA synovial membranes; in healthy synovial membrane these cells were localized in the subintimal zone. More numerous MSC markers in OA synovial membranes were observed in cells also expressing the CD90 antigen. FACS analysis showed that more than 90% of OA synovial membrane-derived cells were positive for CD44, CD73, and CD90, and negative for CD34 and CD45. OA synovial membrane-derived cells were also positive for CD29 (85.23%), CD117 (72.35%), CD105 (45.5%), and STRO-1 (49.46%). Micropellet analyses showed that the culture of cells with transforming growth factor-ß3 stimulated proteoglycan and collagen type II synthesis. Conclusion. Synovial membranes from patients with OA contain more cells positive for CD44, CD90, and CD105 antigens than those from joints with undamaged cartilage.