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Updated: May 22, 2025
Injectable Supramolecular Polymer-Nanoparticle Hydrogels for Cell and Drug Delivery Applications
Published on: February 7, 2021
Injectable Nanocomposite Hydrogels for Intervertebral Disc Degeneration: Combating Oxidative Stress, Mitochondrial
Zhenyu Guo1, Xinzhou Wang1, Jing Sun1
1Department of Orthopaedics, Key Laboratory of Structural Malformations in Children of Zhejiang Province, Key Laboratory of Orthopaedics of Zhejiang Province, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325000, China.
New nanoparticles target mitochondria to combat intervertebral disc degeneration (IVDD) by reducing oxidative stress and iron overload. This approach shows promise for treating low back pain caused by IVDD.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Cell Biology
Background:
- Intervertebral disc degeneration (IVDD) is a primary cause of low back pain.
- Oxidative stress, mitochondrial dysfunction, and ferroptosis are key mechanisms in IVDD pathogenesis.
- Iron overload exacerbates IVDD progression.
Purpose of the Study:
- To explore the therapeutic potential of gallic acid (GA)-derived PGA-Cu nanoparticles functionalized with SS08 peptide (PGA-Cu@SS08) for IVDD.
- To develop a nanocomposite hydrogel for sustained release and enhanced intervertebral disc (IVD) performance.
- To investigate the mechanism of action of PGA-Cu@SS08 in mitigating IVDD.
Main Methods:
- Synthesis of mitochondria-targeted nanoparticles (PGA-Cu@SS08) and their incorporation into a hydrogel matrix.
- Assessment of nanoparticle localization, reactive oxygen species (ROS) scavenging, and mitochondrial function preservation.
- RNA sequencing analysis to elucidate the NRF2 signaling pathway activation and ferroptosis mitigation.
- Evaluation of iron chelation capacity and inhibition of iron storage protein autophagy.
- Characterization of nanocomposite hydrogel biocompatibility, biodegradability, and mechanical properties.
Main Results:
- PGA-Cu@SS08 nanoparticles demonstrated targeted mitochondrial localization and effective ROS scavenging.
- The nanoparticles successfully chelated iron and preserved mitochondrial function.
- RNA sequencing revealed activation of the NRF2 pathway, mitigating ferroptosis and reducing iron overload.
- Nanocomposite hydrogels exhibited excellent biocompatibility, biodegradability, and improved mechanical properties.
- In vivo studies showed restoration of IVD height and tissue hydration.
Conclusions:
- Mitochondria-targeted PGA-Cu@SS08 nanoparticles effectively mitigate IVDD by combating oxidative stress and ferroptosis.
- The developed nanocomposite hydrogel provides a promising platform for sustained drug delivery and IVD regeneration.
- This novel therapeutic strategy holds potential for alleviating low back pain associated with IVDD.
