Extracellular vesicles from human adipose-derived stem cells relieve pain and inflammation in a rat model of knee osteoarthritis.

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)

Background Inflammatory pain is a hallmark symptom of osteoarthritis (OA), characterized by spontaneous hypersensitivity resulting from tissue damage and chronic inflammation. This study investigates the pain-relieving and cartilage-protective potential of extracellular vesicles (EVs) derived from human adipose-derived stem cells (hASCs) as a cell-free therapeutic approach for OA. Methods hASC-EVs were isolated via multi-filtrations based on tangential flow filtration (TFF) and characterized using transmission electron microscopy (TEM), nanoparticle tracking analysis (NTA), dynamic light scattering (DLS), zeta potential measurement, flow cytometry and Liquid chromatography-mass spectrometry (LC-MS/MS)-based proteomic analysis. An in vitro inflammatory OA model was established by treating human osteoarthritic chondrocytes (HC-OA) with interleukin-1β (IL-1β). The expression of inflammation- and pain-related genes was assessed by quantitative PCR (qPCR), and modulation of the Phosphoinositide 3-kinase / Protein kinase B (PI3K/Akt) signaling pathway was analyzed using an antibody array. In vivo therapeutic effects were evaluated in seven-week-old male Wistar rats using a monosodium iodoacetate (MIA)-induced OA model following intra-articular injection of hASC-EVs. Pain behavior was assessed via paw withdrawal latency (PWL), paw withdrawal threshold (PWT), and weight-bearing tests.

Evidence level

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

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