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3D Printing Polycaprolactone-Gelatin for Musculoskeletal Tissue Engineering.

Elaine Lui1,2, Masanori Kobayashi3, Charu Jain2

  • 1Department of Mechanical Engineering, Stanford University, Stanford, California, USA.

Journal of Biomedical Materials Research. Part A
|February 18, 2026
PubMed
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This summary is machine-generated.

This study developed a novel polycaprolactone-gelatin composite for bone tissue engineering. The material shows enhanced biocompatibility, tunable degradation, and promotes cell growth for better bone implant applications.

Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Polymer Science

Background:

  • Musculoskeletal tissue engineering requires bone implants that are biocompatible, resorbable, and promote regeneration.
  • Polycaprolactone (PCL) is a suitable FDA-approved polymer but lacks inherent bioactivity.
  • Functionalizing PCL with natural components like gelatin can improve its properties without harsh crosslinking.

Purpose of the Study:

  • To develop and characterize a novel polycaprolactone-gelatin (PCL-gelatin, PG) composite for 3D printing in bone tissue engineering.
  • To investigate the effect of varying gelatin content on the composite's physical, mechanical, degradation, and biological properties.
  • To evaluate the in vivo biocompatibility and bone regeneration potential of the PG composite.

Main Methods:

Keywords:
3D printingbioactive scaffoldsbone tissue engineeringcomposite biomaterialsgelatinpolycaprolactone

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  • Fabrication of PG composites with 10-30% gelatin and beta-tricalcium phosphate via casting and melt processing into 3D printable filaments.
  • Characterization using mechanical testing, contact angle, FTIR, TGA, EDS, and SEM.
  • In vitro studies with human mesenchymal stem cells and in vivo subcutaneous implantation in rats and critical-size femoral defects.

Main Results:

  • Homogeneous distribution of gelatin nanoparticles in PCL matrix, increasing hydrophilicity and mechanical strength with higher gelatin content.
  • Tunable degradation rates correlated with gelatin concentration.
  • Enhanced human mesenchymal stem cell proliferation and osteogenic differentiation in vitro.
  • Biocompatibility comparable to PCL in vivo with minimal inflammation.
  • Superior early mechanical properties and increased preosteoblast density in critical-size femoral defects for PG30.

Conclusions:

  • A novel, bioactive PCL-gelatin composite was successfully fabricated for 3D printing applications.
  • The composite exhibits tunable degradation, enhanced cellular interactions, and promising bone regeneration capabilities.
  • This fabrication method preserves gelatin bioactivity and offers a promising advancement for bone tissue engineering.