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The Porous SilMA Hydrogel Scaffolds Carrying Dual-Sensitive Paclitaxel Nanoparticles Promote Neuronal Differentiation
Zhixiang Li1,2, Tao Zhou2, Zhengqi Bao2
1School of Life Sciences, Bengbu Medical University, 2600 Donghai Road, Bengbu, 233030, China.
Tissue Engineering and Regenerative Medicine
|July 14, 2024
Summary
This study engineered a hydrogel scaffold with paclitaxel nanoparticles to promote neural stem cell differentiation into neurons, aiding spinal cord injury repair and improving motor function in rats.
Area of Science:
- Biomaterials Science
- Neuroscience
- Regenerative Medicine
Background:
- Spinal cord injury (SCI) pathology often leads to neural stem cell (NSC) differentiation into astrocytes, hindering nerve repair.
- Biocompatible hydrogel scaffolds with targeted delivery systems offer potential for SCI treatment by guiding NSC differentiation.
Purpose of the Study:
- To engineer a 3D-printed SilMA hydrogel scaffold (SM) with pH-/temperature-responsive paclitaxel nanoparticles (PTX-NPs).
- To evaluate the biocompatibility and efficacy of PTX-NPs in promoting NSC differentiation towards neurons for SCI repair.
- To assess the in vivo therapeutic potential of the composite scaffold in an SCI rat model.
Main Methods:
- Fabrication of a 3D-printed porous SilMA hydrogel scaffold.
- Incorporation of pH-/temperature-responsive paclitaxel nanoparticles (PTX-NPs).
- In vitro analysis of PTX-NPs biocompatibility and effect on NSC differentiation.
- Establishment of a rat hemisected SCI model for in vivo evaluation.
Main Results:
- Optimal PTX-NPs dosage demonstrated biocompatibility and controlled release, enhancing NSC viability, morphology, and proliferation.
- PTX-NPs effectively steered NSC differentiation towards neurons over astrocytes via the MAPK/ERK signaling pathway.
- In vivo, the composite scaffold promoted neuronal regeneration, reduced astrocyte and fibrotic scar formation, and improved motor function recovery in SCI rats.
Conclusions:
- The porous hydrogel scaffold acts as an effective carrier for PTX-NPs, creating a conducive microenvironment for nerve regeneration.
- This strategy significantly enhances neuronal expression at the injury site, offering a promising therapeutic approach for spinal cord injury repair.
