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Verstappen K, Klymov A, Cicuéndez M, da Silva DM, Barroca N, Fernández-San-Argimiro FJ, Madarieta I, Casarrubios L, Feito MJ, Diez-Orejas R, Ferreira R, Leeuwenburgh SC, Portolés MT, Marques PA, Walboomers XF. Biocompatible adipose extracellular matrix and reduced graphene oxide nanocomposite for tissue engineering applications. Mater Today Bio 2024; 26:101059. [PMID: 38693996 PMCID: PMC11061343 DOI: 10.1016/j.mtbio.2024.101059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/30/2024] [Accepted: 04/13/2024] [Indexed: 05/03/2024] Open
Abstract
Despite the immense need for effective treatment of spinal cord injury (SCI), no successful repair strategy has yet been clinically implemented. Multifunctional biomaterials, based on porcine adipose tissue-derived extracellular matrix (adECM) and reduced graphene oxide (rGO), were recently shown to stimulate in vitro neural stem cell growth and differentiation. Nevertheless, their functional performance in clinically more relevant in vivo conditions remains largely unknown. Before clinical application of these adECM-rGO nanocomposites can be considered, a rigorous assessment of the cytotoxicity and biocompatibility of these biomaterials is required. For instance, xenogeneic adECM scaffolds could still harbour potential immunogenicity following decellularization. In addition, the toxicity of rGO has been studied before, yet often in experimental settings that do not bear relevance to regenerative medicine. Therefore, the present study aimed to assess both the in vitro as well as in vivo safety of adECM and adECM-rGO scaffolds. First, pulmonary, renal and hepato-cytotoxicity as well as macrophage polarization studies showed that scaffolds were benign invitro. Then, a laminectomy was performed at the 10th thoracic vertebra, and scaffolds were implanted directly contacting the spinal cord. For a total duration of 6 weeks, animal welfare was not negatively affected. Histological analysis demonstrated the degradation of adECM scaffolds and subsequent tissue remodeling. Graphene-based scaffolds showed a very limited fibrous encapsulation, while rGO sheets were engulfed by foreign body giant cells. Furthermore, all scaffolds were infiltrated by macrophages, which were largely polarized towards a pro-regenerative phenotype. Lastly, organ-specific histopathology and biochemical analysis of blood did not reveal any adverse effects. In summary, both adECM and adECM-rGO implants were biocompatible upon laminectomy while establishing a pro-regenerative microenvironment, which justifies further research on their therapeutic potential for treatment of SCI.
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Affiliation(s)
- Kest Verstappen
- Department of Dentistry-Regenerative Biomaterials, Research Institute for Medical Innovation, Radboud University Medical Center, 6525 EX, Nijmegen, the Netherlands
| | - Alexey Klymov
- Department of Dentistry-Regenerative Biomaterials, Research Institute for Medical Innovation, Radboud University Medical Center, 6525 EX, Nijmegen, the Netherlands
| | - Mónica Cicuéndez
- Department of Chemistry in Pharmaceutical Sciences, Faculty of Pharmacy, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos (IdISSC), 28040, Madrid, Spain
| | - Daniela M. da Silva
- Centre for Mechanical Technology and Automation (TEMA), Intelligent Systems Associate Laboratory (LASI), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Nathalie Barroca
- Centre for Mechanical Technology and Automation (TEMA), Intelligent Systems Associate Laboratory (LASI), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal
| | | | - Iratxe Madarieta
- TECNALIA, Basque Research and Technology Alliance (BRTA), E20009, Donostia-San Sebastian, Spain
| | - Laura Casarrubios
- Department of Biochemistry and Molecular Biology, Faculty of Chemistry, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos (IdISSC), 28040, Madrid, Spain
| | - María José Feito
- Department of Biochemistry and Molecular Biology, Faculty of Chemistry, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos (IdISSC), 28040, Madrid, Spain
| | - Rosalía Diez-Orejas
- Department of Microbiology and Parasitology, Faculty of Pharmacy, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos (IdISSC), 28040, Madrid, Spain
| | - Rita Ferreira
- Associated Laboratory for Green Chemistry of the Network of Chemistry and Technology (LAQV-REQUIMTE), Department of Chemistry, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Sander C.G. Leeuwenburgh
- Department of Dentistry-Regenerative Biomaterials, Research Institute for Medical Innovation, Radboud University Medical Center, 6525 EX, Nijmegen, the Netherlands
| | - María Teresa Portolés
- Department of Biochemistry and Molecular Biology, Faculty of Chemistry, Complutense University of Madrid, Health Research Institute of the Hospital Clínico San Carlos (IdISSC), 28040, Madrid, Spain
- Biomedical Research Networking Center in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Institute of Health Carlos III (ISCIII), 28040, Madrid, Spain
| | - Paula A.A.P. Marques
- Centre for Mechanical Technology and Automation (TEMA), Intelligent Systems Associate Laboratory (LASI), Department of Mechanical Engineering, University of Aveiro, 3810-193, Aveiro, Portugal
| | - X. Frank Walboomers
- Department of Dentistry-Regenerative Biomaterials, Research Institute for Medical Innovation, Radboud University Medical Center, 6525 EX, Nijmegen, the Netherlands
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Shafqat A, Albalkhi I, Magableh HM, Saleh T, Alkattan K, Yaqinuddin A. Tackling the glial scar in spinal cord regeneration: new discoveries and future directions. Front Cell Neurosci 2023; 17:1180825. [PMID: 37293626 PMCID: PMC10244598 DOI: 10.3389/fncel.2023.1180825] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/08/2023] [Indexed: 06/10/2023] Open
Abstract
Axonal regeneration and functional recovery are poor after spinal cord injury (SCI), typified by the formation of an injury scar. While this scar was traditionally believed to be primarily responsible for axonal regeneration failure, current knowledge takes a more holistic approach that considers the intrinsic growth capacity of axons. Targeting the SCI scar has also not reproducibly yielded nearly the same efficacy in animal models compared to these neuron-directed approaches. These results suggest that the major reason behind central nervous system (CNS) regeneration failure is not the injury scar but a failure to stimulate axon growth adequately. These findings raise questions about whether targeting neuroinflammation and glial scarring still constitute viable translational avenues. We provide a comprehensive review of the dual role of neuroinflammation and scarring after SCI and how future research can produce therapeutic strategies targeting the hurdles to axonal regeneration posed by these processes without compromising neuroprotection.
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