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Towards Clinical Translation of In Situ Cartilage Engineering Strategies: Optimizing the Critical Facets of a Cell-Laden Hydrogel Therapy. Tissue Eng Regen Med 2022; 20:25-47. [PMID: 36244053 PMCID: PMC9852400 DOI: 10.1007/s13770-022-00487-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 08/08/2022] [Accepted: 08/16/2022] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Articular cartilage repair using implantable photocrosslinkable hydrogels laden with chondrogenic cells, represents a promising in situ cartilage engineering approach for surgical treatment. The development of a surgical procedure requires a minimal viable product optimized for the clinical scenario. In our previous work we demonstrated how gelatin based photocrosslinkable hydrogels in combination with infrapatellar derived stem cells allow the production of neocartilage in vitro. In this study, we aim to optimize the critical facets of the in situ cartilage engineering therapy: the cell source, the cell isolation methodology, the cell expansion protocol, the cell number, and the delivery approach. METHODS We evaluated the impact of the critical facets of the cell-laden hydrogel therapy in vitro to define an optimized protocol that was then used in a rabbit model of cartilage repair. We performed cells counting and immunophenotype analyses, chondrogenic potential evaluation via immunostaining and gene expression, extrusion test analysis of the photocrosslinkable hydrogel, and clinical assessment of cartilage repair using macroscopic and microscopic scores. RESULTS We identified the adipose derived stem cells as the most chondrogenic cells source within the knee joint. We then devised a minimally manipulated stem cell isolation procedure that allows a chondrogenic population to be obtained in only 85 minutes. We found that cell expansion prior to chondrogenesis can be reduced to 5 days after the isolation procedure. We characterized that at least 5 million of cells/ml is needed in the photocrosslinkable hydrogel to successfully trigger the production of neocartilage. The maximum repairable defect was calculated based on the correlation between the number of cells retrievable with the rapid isolation followed by 5-day non-passaged expansion phase, and the minimum chondrogenic concentration in photocrosslinkable hydrogel. We next optimized the delivery parameters of the cell-laden hydrogel therapy. Finally, using the optimized procedure for in situ tissue engineering, we scored superior cartilage repair when compared to the gold standard microfracture approach. CONCLUSION This study demonstrates the possibility to repair a critical size articular cartilage defect by means of a surgical streamlined procedure with optimized conditions.
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Gradišnik L, Bošnjak R, Bunc G, Ravnik J, Maver T, Velnar T. Neurosurgical Approaches to Brain Tissue Harvesting for the Establishment of Cell Cultures in Neural Experimental Cell Models. MATERIALS (BASEL, SWITZERLAND) 2021; 14:6857. [PMID: 34832259 PMCID: PMC8624371 DOI: 10.3390/ma14226857] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Revised: 11/08/2021] [Accepted: 11/11/2021] [Indexed: 12/30/2022]
Abstract
In recent decades, cell biology has made rapid progress. Cell isolation and cultivation techniques, supported by modern laboratory procedures and experimental capabilities, provide a wide range of opportunities for in vitro research to study physiological and pathophysiological processes in health and disease. They can also be used very efficiently for the analysis of biomaterials. Before a new biomaterial is ready for implantation into tissues and widespread use in clinical practice, it must be extensively tested. Experimental cell models, which are a suitable testing ground and the first line of empirical exploration of new biomaterials, must contain suitable cells that form the basis of biomaterial testing. To isolate a stable and suitable cell culture, many steps are required. The first and one of the most important steps is the collection of donor tissue, usually during a surgical procedure. Thus, the collection is the foundation for the success of cell isolation. This article explains the sources and neurosurgical procedures for obtaining brain tissue samples for cell isolation techniques, which are essential for biomaterial testing procedures.
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Affiliation(s)
- Lidija Gradišnik
- Faculty of Medicine, Institute of Biomedical Sciences, University of Maribor, Taborska 8, 2000 Maribor, Slovenia;
- Alma Mater Europaea ECM, Slovenska 17, 2000 Maribor, Slovenia
| | - Roman Bošnjak
- Department of Neurosurgery, University Medical Centre Ljubljana, Zaloska 7, 1000 Ljubljana, Slovenia;
| | - Gorazd Bunc
- Department of Neurosurgery, University Medical Centre Maribor, Ljubljanska 5, 2000 Maribor, Slovenia; (G.B.); (J.R.)
| | - Janez Ravnik
- Department of Neurosurgery, University Medical Centre Maribor, Ljubljanska 5, 2000 Maribor, Slovenia; (G.B.); (J.R.)
| | - Tina Maver
- Faculty of Medicine, Institute of Biomedical Sciences, University of Maribor, Taborska 8, 2000 Maribor, Slovenia;
- Department of Pharmacology, Faculty of Medicine, University of Maribor, Taborska ulica 8, 2000 Maribor, Slovenia
| | - Tomaž Velnar
- Alma Mater Europaea ECM, Slovenska 17, 2000 Maribor, Slovenia
- Department of Neurosurgery, University Medical Centre Ljubljana, Zaloska 7, 1000 Ljubljana, Slovenia;
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Shah S, Mudigonda S, Mitha AP, Salo P, Krawetz RJ. Epidural fat mesenchymal stem cells: Important microenvironmental regulators in health, disease, and regeneration: Do EF-MSCs play a role in dural homeostasis/maintenance? Bioessays 2020; 43:e2000215. [PMID: 33191529 DOI: 10.1002/bies.202000215] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/01/2020] [Accepted: 10/06/2020] [Indexed: 12/26/2022]
Abstract
Mesenchymal stem cells (MSCs) are present in fat tissues throughout the body, yet little is known regarding their biological role within epidural fat. We hypothesize that debridement of epidural fat and/or subsequent loss of MSCs within this tissue, disrupts homeostasis in the vertebral environment resulting in increased inflammation, fibrosis, and decreased neovascularization leading to poorer functional outcomes post-injury/operatively. Clinically, epidural fat is commonly considered a space-filling tissue with limited functionality and therefore typically discarded during surgery. However, the presence of MSCs within epidural fat suggests that itis more biologically active than historically believed and may contribute to the regulation of homeostasis and regeneration in the dural environment. While the current literature supports our hypothesis, it will require additional experimentation to determine if epidural fat is an endogenous driver of repair and regeneration and if so, this tissue should be minimally perturbed from its original location in the spinal canal. Also see the video abstract here https://youtu.be/MIol_IWK1os.
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Affiliation(s)
- Sophia Shah
- McCaig institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada.,Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada
| | - Sathvika Mudigonda
- McCaig institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada
| | - Alim P Mitha
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada.,Department of Clinical Neurosciences, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Hotchkiss Brain Institute, University of Calgary, Calgary, Alberta, Canada
| | - Paul Salo
- McCaig institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada.,Department of Surgery, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Roman J Krawetz
- McCaig institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada.,Biomedical Engineering Graduate Program, University of Calgary, Calgary, Alberta, Canada.,Department of Surgery, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Department of Cell Biology and Anatomy, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
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Cabral JM, da Silva CL, Diogo MM. Stem Cell Bioprocessing and Manufacturing. Bioengineering (Basel) 2020; 7:bioengineering7030084. [PMID: 32751782 PMCID: PMC7552634 DOI: 10.3390/bioengineering7030084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 07/28/2020] [Indexed: 12/13/2022] Open
Abstract
The next healthcare revolution will apply regenerative medicines using human cells and tissues [...].
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