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Apoptotic Vesicles Regulate Bone Metabolism via the miR1324/SNX14/SMAD1/5 Signaling Axis

Yuan Zhu1,2, Kunkun Yang1, Yawen Cheng1

  • 1Department of Prosthodontics, Peking University School and Hospital of Stomatology, 22 Zhongguancun South Avenue, Beijing, 100081, China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 20, 2023
PubMed

Insights

Human bone marrow mesenchymal stem cell-derived apoptotic vesicles (apoVs) promote bone formation and inhibit bone loss. These apoVs offer a novel cell-free therapeutic strategy for bone regeneration and treating osteoporosis.

Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Cell Biology

Background:

  • Mesenchymal stem cells (MSCs) are utilized in disease treatment.
  • In vivo, MSCs undergo apoptosis, releasing apoptotic vesicles (apoVs).
  • The therapeutic potential of apoVs in bone metabolism remains largely unexplored.

Purpose of the Study:

  • To investigate the role of human bone marrow mesenchymal stem cell (hBMMSC)-derived apoVs in bone metabolism.
  • To elucidate the molecular mechanisms underlying apoV-mediated effects on bone.
  • To evaluate apoVs as a cell-free therapeutic strategy for bone loss and regeneration.

Main Methods:

  • Isolation and characterization of apoVs from hBMMSCs.
  • In vitro assays for osteogenesis and osteoclast formation.
  • In vivo studies to assess bone regeneration in bone defect models.
  • Molecular analysis of miR1324, SNX14, and the SMAD1/5 pathway.

Main Results:

  • hBMMSC-derived apoVs significantly promoted osteogenesis in vitro.
  • ApoVs inhibited osteoclast formation in vitro and in vivo.
  • ApoVs demonstrated efficacy in attenuating bone loss and stimulating bone regeneration.
  • The mechanism involves miR1324 inhibiting SNX14, activating the SMAD1/5 pathway.

Conclusions:

  • MSC-derived apoVs represent a promising cell-free therapeutic approach for bone disorders.
  • ApoVs can be easily obtained, stored, and carry low risks of immunological rejection and neoplastic transformation.
  • This study provides a novel strategy for bone tissue engineering and treating osteoporosis.
Keywords:
apoptotic vesiclesbone metabolismcell-free therapymiR1324/SNX14/SMAD1/5 signaling axis

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