Urine-derived stem cells efficiently assemble into micro-bone organoids supported by decellularized bone matrix microparticles for rapidly repairing bone defects through direct filling and paracrine functions

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)

The repair of large bone defects remains a significant challenge in orthopedic clinical practice. This study aims to rapidly cultivate a novel type of bone organoids (BOs), namely uBOs (USCs@DBM-MPs derived BOs), by utilizing self-developed highly biomimetic decellularized bone matrix microparticles (DBM-MPs) as the supporting carrier in combination with non-invasively obtained urine-derived stem cells (USCs), and to explore its therapeutic efficacy and biological mechanism. In our vitro experiments confirmed that DBM-MPs exhibit excellent biocompatibility and osteoinductivity, and urine-derived stem cells (USCs) have comparable osteogenic potential to bone marrow stem cells (BMSCs). Furthermore, USCs were loaded onto DBM-MPs for osteogenic directional induction, and a novel bone organoid-uBOs, was successfully generated within 14 days. Meanwhile, compared with bBOs (BMSCs@DBM-MPs derived BOs), uBOs exhibit comparable levels of biological activity, proliferation characteristics, and osteogenic potential. Moreover, uBOs offer the advantages of a broader availability and a non-invasive acquisition process. What is particularly noteworthy is that these uBOs exhibit paracrine functions capable of promoting both angiogenesis and osteogenesis. In-vivo rat femoral condyle defect model, minimally invasive injection of uBOs into the bone defect area achieved rapid bone regeneration with

Evidence level

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

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