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Published on: July 15, 2009
Intelligent Gene Delivery System Functionalized Metal Implants for Fracture Repair via Remodeling Mitochondrial
Gang Zheng1, Feng Hu1, Mengqian Wu1
1Department of Orthopedics, Shanghai Changzheng Hospital, Second Affiliated Hospital of Naval Medical University, Shanghai, 200003, P. R. China.
This study developed a novel gene delivery system using diselenide-bridged mesoporous organosilica nanoparticles (SeMONs) to enhance fracture healing by improving bone marrow mesenchymal stem cells (BMSCs) function and restoring mitochondrial homeostasis.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedic Surgery
Background:
- Fracture healing is often impaired by reduced osteogenic activity in bone marrow mesenchymal stem cells (BMSCs).
- Oxidative stress and mitochondrial dysfunction in BMSCs hinder the effectiveness of gene therapy for fracture repair.
- Current gene therapy approaches face challenges in targeted delivery and overcoming cellular stress.
Purpose of the Study:
- To engineer an intelligent gene delivery system for targeted delivery to BMSCs, addressing oxidative stress and mitochondrial dysfunction.
- To develop a novel coating for metal implants using this system to promote fracture healing.
- To investigate the underlying molecular mechanisms of enhanced osteogenesis.
Main Methods:
- Fabrication of diselenide-bridged mesoporous organosilica nanoparticles (SeMONs) functionalized with a BMSC-affinity peptide (E7).
- Loading of siRNA-Foxf1 (siFoxf1) into SeMONs to create E7-SeMONs@siFoxf1.
- Coating metal implants with E7-SeMONs@siFoxf1 and evaluating in vitro osteogenesis and in vivo fracture healing in rats.
- Utilizing transcriptome sequencing to elucidate the molecular pathways involved.
Main Results:
- E7-SeMONs demonstrated superior gene delivery properties, ROS-responsive degradation, and ROS scavenging capabilities.
- In vitro studies showed E7-SeMONs@siFoxf1 synergistically promoted BMSCs osteogenesis by restoring mitochondrial homeostasis and upregulating osteogenic gene expression.
- In vivo, implants coated with E7-SeMONs@siFoxf1 significantly accelerated fracture healing in rats.
- Transcriptome analysis revealed activation of the PI3K/Akt/GSK3β/β-catenin pathway.
Conclusions:
- The E7-SeMONs@siFoxf1 system represents an innovative strategy for fracture treatment by combining gene therapy with mitochondrial homeostasis regulation.
- This approach shows significant potential for enhancing fracture repair and holds promise for clinical applications.
- Targeted gene delivery combined with ROS-scavenging nanoparticles offers a potent therapeutic modality for orthopedic regeneration.
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