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Micro-Nanostructured Polymeric Scaffolds for Bone Tissue Engineering.

Sama Abdulmalik1, Suranji Wijekoon1, Khadija Basiru Danazumi2,1

  • 1Department of Orthopedic Surgery, University of Connecticut Health Center, Farmington, CT 06030, USA.

International Journal of High Speed Electronics
|April 8, 2025
PubMed
Summary
This summary is machine-generated.

3D printed PLLA-collagen scaffolds enhance bone regeneration by mimicking native bone structure and promoting cell growth. These bioactive implants offer a promising alternative to traditional bone grafts.

Keywords:
Bone tissue engineeringcollagen type I nanofibrilshuman mesenchymal stem cellsosteogenic differentiationpoly (L-lactic acid)

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Traditional bone grafts (allograft, autograft) face limitations like availability and immune rejection.
  • Tissue-engineered implants present a promising alternative for bone repair and regeneration.
  • Advancements in 3D printing enable the creation of complex, functional scaffolds.

Purpose of the Study:

  • To design and fabricate mechanically competent, 3D printed poly (L-lactic acid) (PLLA) scaffolds.
  • To enhance PLLA scaffolds with collagen type I nanofibrils for bioactivity.
  • To evaluate the performance of micro-nanostructured PLLA and PLLA-collagen scaffolds with bone marrow stromal cells (BMSCs) for bone regeneration.

Main Methods:

  • Fabrication of 3D printed PLLA micro-structured scaffolds.
  • Incorporation of collagen type I nanofibrils to create PLLA-collagen scaffolds.
  • In vitro and in vivo evaluation of scaffold performance with BMSCs, assessing cell adhesion, proliferation, osteogenic differentiation, and bone formation.

Main Results:

  • PLLA-collagen scaffolds successfully mimic trabecular bone architecture and mechanical properties.
  • Both scaffold types supported BMSC adhesion, proliferation, and osteogenic differentiation.
  • PLLA-collagen scaffolds demonstrated superior host cell distribution, bone density, and mineralization compared to PLLA scaffolds.
  • Collagen nanostructure significantly induced osteogenic transcription and guided mature bone matrix formation.

Conclusions:

  • Micro-nanostructured PLLA-collagen scaffolds effectively recreate the inductive microenvironment of native bone extracellular matrix.
  • These scaffolds trigger cellular events essential for functional bone regeneration.
  • The developed scaffolds serve as a viable alternative material platform for repairing critical-sized bone defects.