Developing a Functional Osteoarthritis Model Using Human Osteochondral-Synovial Explants.

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Osteochondral explants can serve as valuable ex vivo models for investigating joint development and testing therapeutic interventions in osteoarthritis (OA). The incorporation of synovial tissue in coculture settings more closely reproduces the inflammatory milieu characteristic of OA joints; however, no report exists regarding the culture media that can support such ex vivo systems. We investigated the reactivity of osteochondral explants using two media types: Dulbecco's modified essential medium (DMEM) and chondrogenic medium (CHONDRO). Additionally, we tested the potential therapeutic effect of serum-free conditioned media (CM) derived from allogeneic adipose-derived stem cells (ADSCs) in the context of OA. Osteochondral fragments with or without homologous synovium were cultured in DMEM and CHONDRO for up to 30 days. A subset of explants received treatment with CM. Explant reactivity was assessed by cytokine release, synovial cellularity, and osteochondral protein content using Western blot and immunohistochemistry. Explants kept in DMEM displayed diminished levels of interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNFα), together with increased Collagen II (Col II) expression. Notably, consistent suppression of TNFα was observed following CM treatment. Conversely, the CHONDRO-kept samples exhibited an increased prevalence of chondrocyte clusters; heightened Perlecan

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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