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Synovial fluid-derived mesenchymal stem cells increase after intra-articular ligament injury in humans

Section of Cartilage Regeneration, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan.
Rheumatology (Oxford, England) (Impact Factor: 4.48). 09/2008; 47(8):1137-43. DOI: 10.1093/rheumatology/ken114
Source: PubMed

ABSTRACT

The existence of mesenchymal stem cells (MSCs) in SF was previously reported. However, the behaviour and properties of MSCs derived from SF have not been fully elucidated.
Human SFs were obtained from 19 knee joints with anterior cruciate ligament injury around the time of reconstruction surgery, and from three healthy volunteers. SF was plated, cultured and examined for colony-forming number, in vitro differentiation, surface epitopes and gene profiles. Also, rabbit synovium-MSCs were injected into the knee joint in a rabbit partial anterior cruciate ligament defect model, and the injected cells were traced.
SF-MSCs from IA ligament injury patients were 100 times more in number than those from healthy volunteers. Total colony number was positively correlated with post-injury period. No significant differences were observed among the cells derived from SF around the time of the surgery in relation to surface epitopes and differentiation potentials. Cluster analysis of gene profiles demonstrated that SF-MSCs were more similar to synovium MSCs than bone marrow MSCs. In rabbit experiments, the MSCs injected into the knee in which IA ligament was partially defective were observed more on the defected area than on the intact area of the ligament at 24 h.
We demonstrated that SF-MSCs, similar to synovium MSCs, increased in number after IA ligament injury and surgery without marked alteration of the properties.

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    • ". Consistently, SF-CP concentrations are increased in arthritic conditions [18] [19] [20] [21] [22], suggesting a role for these cells in host responses to joint trauma and/or degeneration. Accepting their phenotypic suitability, the very low numbers of these cells in synovial fluid [19] [22] [23] [26] and intrinsic limits to proliferation [20] [27] represent major obstacles to potential clinical applications of SF-CPs [20] [28] [29]. "
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    ABSTRACT: Mesenchymal stem cells have been identified in the synovial fluid of several species. This study was conducted to characterize chondroprogenitor (CP) cells in equine synovial fluid (SF) and to determine the effect of fibroblast growth factor 2 (FGF-2) on SF-CP monolayer proliferation and subsequent chondrogenesis. We hypothesized that FGF-2 would stimulate SF-CP proliferation and postexpansion chondrogenesis. SF aspirates were collected from adult equine joints. Colony-forming unit (CFU) assays were performed during primary cultures. At first passage, SF-cells were seeded at low density, with or without FGF-2. Following monolayer expansion and serial immunophenotyping, cells were transferred to chondrogenic pellet cultures. Pellets were analyzed for chondrogenic mRNA expression and cartilage matrix secretion. There was a mean of 59.2 CFU/mL of SF. FGF-2 increased the number of population doublings during two monolayer passages and halved the population doubling times. FGF-2 did not alter the immunophenotype of SF-CPs during monolayer expansion, nor did FGF-2 compromise chondrogenesis. Hypertrophic phenotypic markers were not expressed in control or FGF-2 groups. FGF-2 did prevent the development of a “fibroblastic” cell layer around pellet periphery. FGF-2 significantly accelerates in vitro SF-CP expansion, the major hurdle to clinical application of this cell population, without detrimentally affecting subsequent chondrogenic capacity.
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    • "SF is an easily accessible source of MSCs, which can be obtained during diagnosis or treatment of patients when clinicians confirm a diagnosis of RA without harming [10]. Moreover, the population of MSCs derived from SF (SF-MSCs) in the synovial cavity of arthritis patients is highly increased compared to that in healthy patients [11] [12] [13]. Hence, SF-MSCs are excellent candidates for autologous stem cell therapy in patients with inflamed or injured joints. "
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    • "Even so, they still assumed SFMSCs were possibly derived from dislodged SFs. In addition, Morito et al.[10] also assumed that SFMSCs in the knee joint may be derived from the synovium, because the morphology, gene expression profiles, and colony size of SFMSCs seemed to be more similar to those of SMMSCs than to those of BMSCs. Furthermore, joint injury is also likely to cause intima disruption and consequently trigger an increase in SFMSCs. "
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