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Rationally Designed, Self-Assembling, Multifunctional Hydrogel Depot Repairs Severe Spinal Cord Injury
Jingjia Ye1,2, Shuang Jin2, Wanxiong Cai2
1Department of Neurobiology and Department of Orthopedics, 2nd Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310009, P. R.China.
Advanced Healthcare Materials
|May 24, 2021
Summary
A novel hydrogel delivers methylprednisolone sodium succinate (MPSS) and growth factors (GFs) to heal severe spinal cord injury (SCI) sites. This promotes nerve regrowth by reducing inflammation and preventing scar formation.
Area of Science:
- Regenerative Medicine
- Neuroscience
- Biomaterials Science
Background:
- Severe spinal cord injury (SCI) triggers neuroinflammation, leading to cell death, scar formation, and a hostile microenvironment that impedes nerve regeneration.
- Current treatments for SCI struggle to address the complex pathophysiology, including scar and cavity formation, hindering effective nerve regrowth and functional recovery.
Purpose of the Study:
- To develop a one-step, self-assembling hydrogel depot for localized, time-controlled delivery of anti-inflammatory drugs and growth factors to treat severe SCI.
- To investigate the hydrogel's efficacy in promoting scar- and cavity-free wound healing and remodeling the microenvironment to support nerve regeneration after SCI.
Main Methods:
- A multifunctional, self-assembling hydrogel was engineered to co-deliver methylprednisolone sodium succinate (MPSS) and growth factors (GFs).
- The hydrogel's ability to release therapeutics locally and punctually was assessed in the context of SCI pathophysiology.
- Functional recovery was evaluated using behavioral and electrophysiological studies to assess the impact of the treatment on spared and regenerating axons.
Main Results:
- The hydrogel depot successfully released MPSS and GFs, protecting neural tissues from secondary injury and promoting scar- and cavity-free wound healing.
- Significant axonal regrowth was observed, facilitated by permissive bridges formed within the remodeled microenvironment.
- Functional recovery was primarily mediated by spared axons, indicating the need for further interventions to enhance the functionality of rebuilt neuronal circuits.
Conclusions:
- The developed hydrogel offers a promising systemic solution for acute SCI by addressing key pathological features like inflammation and scar formation.
- While the hydrogel facilitates axonal regrowth and functional recovery via spared axons, additional strategies are necessary to ensure the functionality of regenerated neural circuits.
- This approach lays the groundwork for innovative therapeutic strategies aimed at comprehensive SCI repair.
