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MicroRNA-200c Release from Gelatin-Coated 3D-Printed PCL Scaffolds Enhances Bone Regeneration.
Matthew T Remy1,2, Chawin Upara1, Qiong J Ding1
1Iowa Institute for Oral Health Research, College of Dentistry, The University of Iowa, Iowa City, Iowa 52242, United States.
ACS Biomaterials Science & Engineering
|March 26, 2024
Summary
Researchers developed new synthetic bone grafts using 3D-printed materials and microRNA-200c (miR-200c) to enhance bone regeneration. These novel grafts effectively deliver miR-200c, promoting osteogenic differentiation and healing critical-sized bone defects.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Gene Therapy
Background:
- Clinically relevant synthetic bone grafts require biodegradable materials and osteogenic biomolecules for enhanced regeneration.
- MicroRNA-200c (miR-200c) is a potent biomolecule that promotes osteogenic differentiation and bone formation.
- Sustained delivery systems for miR-200c in synthetic bone grafts for enhanced bone regeneration are not yet established.
Purpose of the Study:
- To create novel, multimaterial synthetic bone grafts for sustained delivery of DNA encoding miR-200c.
- To optimize the release kinetics of DNA encoding miR-200c by modulating gelatin coatings and crosslinking on polycaprolactone (PCL) scaffolds.
- To evaluate the efficacy of these enhanced bone grafts in promoting osteogenic differentiation and bone regeneration.
Main Methods:
- Fabrication of gelatin-coated 3D-printed polycaprolactone (PCL) scaffolds.
- Optimization of gelatin types, concentrations, and crosslinking agents (glutaraldehyde) to control DNA encoding miR-200c release.
- In vitro assessment of osteogenic differentiation and in vivo evaluation in a critical-sized calvarial bone defect model.
Main Results:
- Modulation of gelatin coating and crosslinking effectively controlled the release rates of DNA encoding miR-200c.
- The optimized scaffolds promoted significant osteogenic differentiation in vitro.
- Successful enhancement of bone regeneration in a critical-sized calvarial defect model in vivo.
- Low-concentration glutaraldehyde crosslinking of gelatin coatings was biocompatible and improved cell attachment.
Conclusions:
- Gelatin-based systems are effective for sustained delivery of DNA encoding microRNA (miR-200c) for gene therapy applications.
- The developed synthetic bone grafts demonstrate significant potential for enhancing bone regeneration.
- MicroRNA-200c plays a crucial role in enhancing bone regeneration when delivered via synthetic bone grafts.
