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Biological Compatibility Profile on Biomaterials for Bone Regeneration
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The cell membrane as biofunctional material for accelerated bone repair.

Emi Hatano1, Nahid Akhter2, Risa Anada3

  • 1Advanced Research Center for Oral and Craniofacial Sciences Dental School, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan.

Acta Biomaterialia
|August 1, 2024
PubMed
Summary

Plasma membrane nanofragments (PMNFs) accelerate bone repair by attracting key cells to healing sites. This cell-free therapy promotes bone integration and hardness comparable to native bone.

Keywords:
Amorphous calcium phosphateBone repairBone tissue engineeringCell membraneCritical-sized calvarial defectPlasma membrane

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Plasma membranes contain vital components for cell interactions and tissue repair.
  • Plasma membrane nanofragments (PMNFs) were previously shown to nucleate bone formation.
  • Optimizing PMNF generation and application is crucial for therapeutic use.

Purpose of the Study:

  • To optimize the generation, isolation, and application of PMNFs as a cell-free therapeutic for bone defect repair.
  • To evaluate the efficacy of PMNFs in accelerating bone healing in a mouse calvarial defect model.
  • To compare PMNF performance against other bone graft materials.

Main Methods:

  • PMNFs were isolated from various mouse cell lines (chondrocytes, osteoblasts, fibroblasts), pre-conditioned, and lyophilized.
  • PMNFs were transplanted into critical-sized calvarial defects in mice (n=75).
  • Bone repair, cell infiltration, bone integration, and mechanical properties were assessed using histological, in vitro, and microhardness tests.

Main Results:

  • Chondrocyte-derived PMNFs significantly accelerated bone repair within 2 weeks by recruiting macrophages, endothelial cells, and osteoblasts.
  • PMNFs enhanced cell adhesion in vitro and demonstrated superior bone integration compared to amorphous calcium phosphate (ACP).
  • Regenerated bone exhibited Vickers microhardness similar to native bone after 6 weeks.

Conclusions:

  • Cell membrane-derived nanofragments represent a promising cell-free biomaterial for bone regeneration.
  • PMNFs possess multifaceted biofunctional properties that promote accelerated and integrated bone healing.
  • This study establishes PMNFs as a novel therapeutic strategy for expediting bone defect repair.