T Cell-Derived Apoptotic Extracellular Vesicles Ameliorate Bone Loss via CD39 and CD73-Mediated ATP Hydrolysis

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 Osteoporosis is a major public health concern characterized by decreased bone density. Among various therapeutic strategies, apoptotic extracellular vesicles (ApoEVs) have emerged as promising agents in tissue regeneration. Specifically, T cell-derived ApoEVs have shown substantial potential in facilitating bone regeneration. However, it remains unclear whether ApoEVs can promote bone mass recovery through enzymatic activity mediated by membrane surface molecules. Therefore, this study aimed to investigate whether T cell-derived ApoEVs could promote bone mass recovery in osteoporosis mice and reveal the underlying mechanisms. Methods ApoEVs were isolated through sequential centrifugation, and their proteomic profiles were identified via mass spectrometry. Western blot and immunogold staining confirmed the enrichment of CD39 and CD73 on ApoEVs. The role of CD39 and CD73 in hydrolyzing adenosine triphosphate (ATP) to adenosine was evaluated by quantifying the levels of ATP and adenosine. Inhibitors of CD39 and CD73, and an A2BR antagonist were used to explore the molecular mechanism of ApoEVs in promoting bone regeneration. Results ApoEVs significantly reduced bone loss and promote the osteogenic differentiation of BMMSCs in ovariectomy (OVX) mice. We observed increased levels of extracellular ATP and a decrease in CD39 and CD73, key enzymes in ATP-to-adenosine convers

Evidence level

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

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