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Ji X, Walczak P, Boltze J. Mitigating the impact of mechanisms causing neuronal degeneration. NEUROPROTECTION 2024; 2:1-3. [PMID: 38645567 PMCID: PMC11027578 DOI: 10.1002/nep3.41] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Accepted: 03/06/2024] [Indexed: 04/23/2024]
Affiliation(s)
- Xuming Ji
- Beijing Institute of Brain Disorders, Capital Medical University, Beijing, China
| | - Piotr Walczak
- Center for Advanced Imaging Research, Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland, Baltimore, MD, USA
| | - Johannes Boltze
- School of Life Sciences, University of Warwick, Coventry, United Kingdom
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Damian C, Ghuman H, Mauney C, Azar R, Reinartz J, Badylak SF, Modo M. Post-Stroke Timing of ECM Hydrogel Implantation Affects Biodegradation and Tissue Restoration. Int J Mol Sci 2021; 22:ijms222111372. [PMID: 34768800 PMCID: PMC8583606 DOI: 10.3390/ijms222111372] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/13/2021] [Accepted: 10/17/2021] [Indexed: 01/01/2023] Open
Abstract
Extracellular matrix (ECM) hydrogel promotes tissue regeneration in lesion cavities after stroke. However, a bioscaffold's regenerative potential needs to be considered in the context of the evolving pathological environment caused by a stroke. To evaluate this key issue in rats, ECM hydrogel was delivered to the lesion core/cavity at 7-, 14-, 28-, and 90-days post-stroke. Due to a lack of tissue cavitation 7-days post-stroke, implantation of ECM hydrogel did not achieve a sufficient volume and distribution to warrant comparison with the other time points. Biodegradation of ECM hydrogel implanted 14- and 28-days post-stroke were efficiently (80%) degraded by 14-days post-bioscaffold implantation, whereas implantation 90-days post-stroke revealed only a 60% decrease. Macrophage invasion was robust at 14- and 28-days post-stroke but reduced in the 90-days post-stroke condition. The pro-inflammation (M1) and pro-repair (M2) phenotype ratios were equivalent at all time points, suggesting that the pathological environment determines macrophage invasion, whereas ECM hydrogel defines their polarization. Neural cells (neural progenitors, neurons, astrocytes, oligodendrocytes) were found at all time points, but a 90-days post-stroke implantation resulted in reduced densities of mature phenotypes. Brain tissue restoration is therefore dependent on an efficient delivery of a bioscaffold to a tissue cavity, with 28-days post-stroke producing the most efficient biodegradation and tissue regeneration, whereas by 90-days post-stroke, these effects are significantly reduced. Improving our understanding of how the pathological environment influences biodegradation and the tissue restoration process is hence essential to devise engineering strategies that could extend the therapeutic window for bioscaffolds to repair the damaged brain.
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Affiliation(s)
- Corina Damian
- Department of Neuroscience, University of Pittsburgh, Pittsburgh, PA 15260, USA; (C.D.); (C.M.)
| | - Harmanvir Ghuman
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA; (H.G.); (R.A.); (S.F.B.)
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Carrinton Mauney
- Department of Neuroscience, University of Pittsburgh, Pittsburgh, PA 15260, USA; (C.D.); (C.M.)
| | - Reem Azar
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA; (H.G.); (R.A.); (S.F.B.)
| | - Janina Reinartz
- Department of Radiology, University of Pittsburgh, Pittsburgh, PA 15260, USA;
| | - Stephen F. Badylak
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA; (H.G.); (R.A.); (S.F.B.)
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15213, USA
| | - Michel Modo
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA; (H.G.); (R.A.); (S.F.B.)
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA
- Department of Radiology, University of Pittsburgh, Pittsburgh, PA 15260, USA;
- Correspondence: ; Tel.: +1-(412)-383-7200
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Chen F, Wu M, Wu P, Xiao A, Ke M, Huselstein C, Cai L, Tong Z, Chen Y. Natural Flammulina velutipes-Based Nerve Guidance Conduit as a Potential Biomaterial for Peripheral Nerve Regeneration: In Vitro and In Vivo Studies. ACS Biomater Sci Eng 2021; 7:3821-3834. [PMID: 34297535 DOI: 10.1021/acsbiomaterials.1c00304] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The treatment and repair of serious peripheral nerve injuries remain challenging in the clinical practice, while the application of multifunctional nerve guidance conduits (NGCs) based on naturally derived polymers has attracted much attention in recent years because of their excellent physicochemical properties and biological characteristics. Flammulina velutipes (Curt. ex FV) is a popular edible mushroom characterized by hollow tubular structures, antibacterial activities, and high nutritional properties. In this study, FV is utilized to construct NGCs (labeled FVC) via a freeze-drying technique without chemical modifications. The morphology, physical properties, cellular biocompatibility, antibacterial properties, and nerve regeneration capacity of FVC were assessed both in vitro and in vivo. FVC is composed of hollow tubes and evenly irregular interconnected micropores with 73.8 ± 5.5% porosity and 476.1 ± 12.9 μm hollow tube diameter. The inner surface of the FVC presents multiple microgrooves elongated parallel to the long axis. Moreover, FVC possessed strong antibacterial activity and could inhibit Gram-positive Staphylococcus aureus growth by up to 96.0% and Gram-negative Escherichia coli growth by up to 94.8% in vitro. FVC exhibited excellent biocompatibility and effectively promoted PC-12 cell proliferation and elongation in vitro. When applied to repair critical-sized sciatic nerve defects, FVC could effectively stimulate nerve functional recovery and axonal outgrowth in a rat model. Interestingly, Western blot analysis indicated that growth-associated protein 43 (GAP-43) had increased expression levels in the FVC group compared with the autograft group. This result suggested that by activating the Janus activated kinase2 (JAK2)/Phosphorylation ofsignal transducer and activator of transcription-3 (STAT3) signaling pathway, FVC upregulated Phosphorylation of signal transducer and activator of transcription-3 (P-STAT3) in vivo, resulting in the secretion of GAP-43. Collectively, a natural NGC FVC was fabricated based on FV without chemical modifications. The morphology, physical properties, cellular biocompatibility, antibacterial properties, and nerve regeneration capacity of FVC provide new insights for its further optimization and application in the field of nerve tissue engineering.
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Affiliation(s)
- Feixiang Chen
- Department of Biomedical Engineering and Hubei Province Key Laboratory of Allergy and Immune Related Diseases, School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China
| | - Minhao Wu
- Department of Spine Surgery and Musculoskeletal Tumor, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Ping Wu
- Department of Biomedical Engineering and Hubei Province Key Laboratory of Allergy and Immune Related Diseases, School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China
| | - Ao Xiao
- Department of Biomedical Engineering and Hubei Province Key Laboratory of Allergy and Immune Related Diseases, School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China
| | - Meifang Ke
- Department of Biomedical Engineering and Hubei Province Key Laboratory of Allergy and Immune Related Diseases, School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China
| | - Céline Huselstein
- CNRS UMR 7561 and FR CNRS-INSERM 32.09 Nancy University, Vandœuvre-lès-Nancy 54500, France
| | - Lin Cai
- Department of Spine Surgery and Musculoskeletal Tumor, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Zan Tong
- Department of Biomedical Engineering and Hubei Province Key Laboratory of Allergy and Immune Related Diseases, School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China
| | - Yun Chen
- Department of Biomedical Engineering and Hubei Province Key Laboratory of Allergy and Immune Related Diseases, School of Basic Medical Sciences, Wuhan University, Wuhan 430071, China
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