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Luchian A, Ressel L. Combined colour deconvolution and artificial intelligence approach for region-selective immunohistochemical labelling quantification: The example of alpha smooth muscle actin in mouse kidney. JOURNAL OF BIOPHOTONICS 2024; 17:e202300244. [PMID: 37877208 DOI: 10.1002/jbio.202300244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 09/05/2023] [Accepted: 10/19/2023] [Indexed: 10/26/2023]
Abstract
Immunohistochemical (IHC) localisation of protein expression is a widely used tool in pathology. This is semi-quantitative and exhibits substantial intra- and inter-observer variability. Digital approaches based on stain quantification applied to IHC are precise but still operator-dependent and time-consuming when regions of interest (ROIs) must be defined to quantify protein expression in a specific tissue area. This study aimed at developing an IHC quantification workflow that benefits from colour deconvolution for stain quantification and artificial intelligence for automatic ROI definition. The method was tested on 10 whole slide images (WSI) of alpha-smooth muscle actin (aSMA) stained mouse kidney sections. The task was to identify aSMA-positive areas within the glomeruli automatically. Total aSMA detection was performed using two channels (DAB, haematoxylin) colour deconvolution. Glomeruli segmentation within the same IHC WSI was performed by training a convolutional neural network with annotated examples of glomeruli. For both aSMA and glomeruli, binary masks were created. Co-localisation was performed by overlaying the masks and assigning red/green colours, with yellow indicative of a co-localised signal. The workflow described and exemplified using the case of aSMA expression in glomeruli can be applied to quantify the expression of IHC markers within different structures of immunohistochemically stained slides. The technique is objective, has a fully automated threshold approach (colour deconvolution phase) and uses AI to eliminate operator-dependent steps.
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Affiliation(s)
- Andreea Luchian
- Department of Veterinary Anatomy Physiology and Pathology, Institute of Infection Veterinary and Ecological Science, University of Liverpool, Neston, UK
| | - Lorenzo Ressel
- Department of Veterinary Anatomy Physiology and Pathology, Institute of Infection Veterinary and Ecological Science, University of Liverpool, Neston, UK
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2
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Kresse JC, Gregersen E, Atay JCL, Eijken M, Nørregaard R. Does the route matter? A preclinical review of mesenchymal stromal cell delivery to the kidney. APMIS 2023; 131:687-697. [PMID: 37750005 DOI: 10.1111/apm.13352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 09/08/2023] [Indexed: 09/27/2023]
Abstract
Mesenchymal stromal/stem cell (MSC) therapy has been thoroughly tested in preclinical animal models and holds great promise for the treatment of kidney diseases. It is becoming increasingly evident that the efficacy of MSC therapy is dependent on several factors including dosage, the tissue source of MSCs, the route of delivery and timing of administration. In a time where MSC therapy is moving from preclinical research to clinically therapeutic use, the importance of choice of delivery method, modality, and administration route increases. In this review, we provide an overview of the different MSC delivery routes used in preclinical kidney disease models, highlight the recent advances in the field, and summarize studies comparing delivery routes of MSCs to the kidney.
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Affiliation(s)
| | - Emil Gregersen
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | | | - Marco Eijken
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Clinical Immunology, Aarhus University Hospital, Aarhus, Denmark
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Rikke Nørregaard
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
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3
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da Silva TB, Rendra E, David CAW, Bieback K, Cross MJ, Wilm B, Liptrott NJ, Murray P. Umbilical cord mesenchymal stromal cell-derived extracellular vesicles lack the potency to immunomodulate human monocyte-derived macrophages in vitro. Biomed Pharmacother 2023; 167:115624. [PMID: 37783151 DOI: 10.1016/j.biopha.2023.115624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2023] [Revised: 09/26/2023] [Accepted: 09/28/2023] [Indexed: 10/04/2023] Open
Abstract
Mesenchymal stromal cells (MSCs) have been reported to display efficacy in a variety of preclinical models, but without long-term engraftment, suggesting a role for secreted factors, such as MSC-derived extracellular vesicles (EVs). MSCs are known to elicit immunomodulatory effects, an important aspect of which is their ability to affect macrophage phenotype. However, it is not clear if these effects are mediated by MSC-derived EVs, or other factors secreted by the MSCs. Here, we use flow cytometry to assess the effects of human umbilical cord (hUC) MSC-derived EVs on the expression of pro-inflammatory (CD80) and anti-inflammatory (CD163) surface markers in human monocyte-derived macrophages (hMDMs). hUC-MSC-derived EVs did not change the surface marker expression of the hMDMs. In contrast, when hMDMs were co-incubated with hUC-MSCs in indirect co-cultures, changes were observed in the expression of CD14, CD80 and CD163, particularly in M1 macrophages, suggesting that soluble factors are necessary to elicit a shift in phenotype. However, even though EVs did not alter the surface marker expression of macrophages, they promoted angiogenesis and phagocytic capacity increased proportionally to increases in EV concentration. Taken together, these results suggest that hUC-MSC-derived EVs are not sufficient to alter macrophage phenotype and that additional MSC-derived factors are needed.
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Affiliation(s)
- Tamiris Borges da Silva
- Department of Molecular Physiology and Cell Signalling, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, L69 3GE Liverpool, UK
| | - Erika Rendra
- Institute of Transfusion Medicine and Immunology, Mannheim Institute of Innate Immunoscience, Medical Faculty Mannheim, Heidelberg University, Mannheim 68167, Germany
| | - Christopher A W David
- Immunocompatibility Group, Department of Pharmacology and Therapeutics, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Karen Bieback
- Institute of Transfusion Medicine and Immunology, Mannheim Institute of Innate Immunoscience, Medical Faculty Mannheim, Heidelberg University, Mannheim 68167, Germany; Mannheim Institute for Innate Immunoscience, Medical Faculty Mannheim, Heidelberg University, Germany
| | - Michael J Cross
- Department of Pharmacology and Therapeutics, University of Liverpool, Liverpool L69 3GL, UK
| | - Bettina Wilm
- Department of Molecular Physiology and Cell Signalling, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, L69 3GE Liverpool, UK
| | - Neill J Liptrott
- Immunocompatibility Group, Department of Pharmacology and Therapeutics, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Patricia Murray
- Department of Molecular Physiology and Cell Signalling, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Crown Street, L69 3GE Liverpool, UK.
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Mukkala AN, Jerkic M, Khan Z, Szaszi K, Kapus A, Rotstein O. Therapeutic Effects of Mesenchymal Stromal Cells Require Mitochondrial Transfer and Quality Control. Int J Mol Sci 2023; 24:15788. [PMID: 37958771 PMCID: PMC10647450 DOI: 10.3390/ijms242115788] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 10/25/2023] [Accepted: 10/27/2023] [Indexed: 11/15/2023] Open
Abstract
Due to their beneficial effects in an array of diseases, Mesenchymal Stromal Cells (MSCs) have been the focus of intense preclinical research and clinical implementation for decades. MSCs have multilineage differentiation capacity, support hematopoiesis, secrete pro-regenerative factors and exert immunoregulatory functions promoting homeostasis and the resolution of injury/inflammation. The main effects of MSCs include modulation of immune cells (macrophages, neutrophils, and lymphocytes), secretion of antimicrobial peptides, and transfer of mitochondria (Mt) to injured cells. These actions can be enhanced by priming (i.e., licensing) MSCs prior to exposure to deleterious microenvironments. Preclinical evidence suggests that MSCs can exert therapeutic effects in a variety of pathological states, including cardiac, respiratory, hepatic, renal, and neurological diseases. One of the key emerging beneficial actions of MSCs is the improvement of mitochondrial functions in the injured tissues by enhancing mitochondrial quality control (MQC). Recent advances in the understanding of cellular MQC, including mitochondrial biogenesis, mitophagy, fission, and fusion, helped uncover how MSCs enhance these processes. Specifically, MSCs have been suggested to regulate peroxisome proliferator-activated receptor-gamma coactivator 1 alpha (PGC1α)-dependent biogenesis, Parkin-dependent mitophagy, and Mitofusins (Mfn1/2) or Dynamin Related Protein-1 (Drp1)-mediated fission/fusion. In addition, previous studies also verified mitochondrial transfer from MSCs through tunneling nanotubes and via microvesicular transport. Combined, these effects improve mitochondrial functions, thereby contributing to the resolution of injury and inflammation. Thus, uncovering how MSCs affect MQC opens new therapeutic avenues for organ injury, and the transplantation of MSC-derived mitochondria to injured tissues might represent an attractive new therapeutic approach.
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Affiliation(s)
- Avinash Naraiah Mukkala
- Unity Health Toronto, The Keenan Research Centre for Biomedical Science of St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada; (A.N.M.); (Z.K.); (K.S.); (A.K.); (O.R.)
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Mirjana Jerkic
- Unity Health Toronto, The Keenan Research Centre for Biomedical Science of St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada; (A.N.M.); (Z.K.); (K.S.); (A.K.); (O.R.)
| | - Zahra Khan
- Unity Health Toronto, The Keenan Research Centre for Biomedical Science of St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada; (A.N.M.); (Z.K.); (K.S.); (A.K.); (O.R.)
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Katalin Szaszi
- Unity Health Toronto, The Keenan Research Centre for Biomedical Science of St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada; (A.N.M.); (Z.K.); (K.S.); (A.K.); (O.R.)
- Department of Surgery, University of Toronto, Toronto, ON M5T 1P5, Canada
| | - Andras Kapus
- Unity Health Toronto, The Keenan Research Centre for Biomedical Science of St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada; (A.N.M.); (Z.K.); (K.S.); (A.K.); (O.R.)
- Department of Surgery, University of Toronto, Toronto, ON M5T 1P5, Canada
| | - Ori Rotstein
- Unity Health Toronto, The Keenan Research Centre for Biomedical Science of St. Michael’s Hospital, University of Toronto, Toronto, ON M5B 1T8, Canada; (A.N.M.); (Z.K.); (K.S.); (A.K.); (O.R.)
- Department of Surgery, University of Toronto, Toronto, ON M5T 1P5, Canada
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Hori H, Sakai K, Ohashi A, Nakai S. Chitin powder enhances growth factor production and therapeutic effects of mesenchymal stem cells in a chronic kidney disease rat model. J Artif Organs 2023; 26:203-211. [PMID: 35976577 DOI: 10.1007/s10047-022-01346-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 07/06/2022] [Indexed: 10/15/2022]
Abstract
Previously, we fabricated a device with polylactic acid nonwoven filters and mesenchymal stem cells (MSCs), which effectively reduced urinary protein levels in a rat model of chronic kidney disease (CKD) but could not suppress CKD progression. Therefore, to improve the therapeutic effects of MSCs, in this study, we analyzed the ability of rat adipose tissue-derived MSCs (ADSCs) in contact with chitin nonwoven filters or chitin powder to produce growth factors and examined their therapeutic effect in an adriamycin (ADR)-induced CKD rat model. Hepatocyte growth factor (HGF) and vascular endothelial growth factor (VEGF) production was significantly enhanced by ADSCs cultured in a medium containing chitin powder (C-ADSCs) compared with that by ADSCs cultured in a standard medium without chitin (N-ADSCs). However, the production of HGF and VEGF by ADSCs on chitin nonwoven filters was not significantly enhanced compared with that by the control. Intravenous C-ADSC injection significantly increased podocin expression and improved proteinuria compared with those in saline-treated CKD rats; however, no such improvements were observed in the N-ADSC-treated group. These results showed that ADSCs cultured in a medium supplemented with chitin powder suppressed proteinuria via enhanced HGF and VEGF production in ADR-induced CKD rats to mitigate podocyte damage, offering a new strategy to reduce the dose of MSC therapy for safe and effective treatment of kidney disease.
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Affiliation(s)
- Hideo Hori
- Faculty of Medical Technology, School of Medical Sciences, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan.
| | - Kazuyoshi Sakai
- Faculty of Clinical Engineering, School of Medical Sciences, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan
| | - Atsushi Ohashi
- Faculty of Clinical Engineering, School of Medical Sciences, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan
| | - Shigeru Nakai
- Faculty of Clinical Engineering, School of Medical Sciences, Fujita Health University, 1-98 Dengakugakubo, Kutsukake-cho, Toyoake, Aichi, 470-1192, Japan.
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Lin C, Chen W, Han Y, Sun Y, Zhao X, Yue Y, Li B, Fan W, Zhang T, Xiao L. PTEN-induced kinase 1 enhances the reparative effects of bone marrow mesenchymal stromal cells on mice with renal ischaemia/reperfusion-induced acute kidney injury. Hum Cell 2022; 35:1650-1670. [PMID: 35962179 PMCID: PMC9515057 DOI: 10.1007/s13577-022-00756-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 07/18/2022] [Indexed: 11/28/2022]
Abstract
Acute kidney injury (AKI) is a common severe acute syndrome caused by multiple factors and is characterized by a rapid decline in renal function during a short period. Bone marrow mesenchymal stromal cells (BMSCs) are effective in treating AKI. However, the mechanism of their beneficial effects remains unclear. PTEN-induced kinase 1 (PINK1) may play an important role in kidney tissue repair. In this study, we explored the effect of PINK1 overexpression on enhancing BMSC-mediated repair of AKI. In this study, ischaemia/reperfusion-induced AKI (IRI-AKI) in mice and a hypoxia-reoxygenation model in cells were established, and the indices were examined by pathology and immunology experiments. After ischaemia/reperfusion, PINK1 overexpression reduced apoptosis in injured kidney tissue cell, decreased T lymphocyte infiltration, increased macrophage infiltration, and alleviated the inflammatory response. PINK1 relieved the stress response of BMSCs and renal tubular epithelial cells (RTECs), reduced apoptosis, altered the release of inflammatory factors, and reduced the proliferation of peripheral blood mononuclear cells (PBMCs). In conclusion, BMSCs and RTECs undergo stress responses in response to hypoxia, inflammation and other conditions, and overexpressing PINK1 in BMSCs could enhance their ability to resist these stress reactions. Furthermore, PINK1 overexpression can regulate the distribution of immune cells and improve the inflammatory response. The regulation of mitochondrial autophagy during IRI-AKI maintains mitochondrial homeostasis and protects renal function. The results of this study provide new strategies and experimental evidence for BMSC-mediated repair of IRI-AKI.
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Affiliation(s)
- Chenyu Lin
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China
| | - Wen Chen
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China
| | - Yong Han
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China
| | - Yujie Sun
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China
| | - Xiaoqiong Zhao
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China.,Jiamusi University, Jiamusi, China
| | - Yuan Yue
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China.,Jiamusi University, Jiamusi, China
| | - Binyu Li
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China
| | - Wenmei Fan
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China
| | | | - Li Xiao
- Institute of Respiratory and Critical Medicine, Beijing Key Laboratory of Organ Transplantation and Immunology Regulatory, the 8th Medical Centre of Chinese PLA General Hospital, No. 17 Heishan Hu road, Qinglongqiao street, Haidian district, Beijing, 100091, China.
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7
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Sanchez-Diaz M, Quiñones-Vico MI, Sanabria de la Torre R, Montero-Vílchez T, Sierra-Sánchez A, Molina-Leyva A, Arias-Santiago S. Biodistribution of Mesenchymal Stromal Cells after Administration in Animal Models and Humans: A Systematic Review. J Clin Med 2021; 10:jcm10132925. [PMID: 34210026 PMCID: PMC8268414 DOI: 10.3390/jcm10132925] [Citation(s) in RCA: 54] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/24/2021] [Accepted: 06/25/2021] [Indexed: 12/15/2022] Open
Abstract
Mesenchymal Stromal Cells (MSCs) are of great interest in cellular therapy. Different routes of administration of MSCs have been described both in pre-clinical and clinical reports. Knowledge about the fate of the administered cells is critical for developing MSC-based therapies. The aim of this review is to describe how MSCs are distributed after injection, using different administration routes in animal models and humans. A literature search was performed in order to consider how MSCs distribute after intravenous, intraarterial, intramuscular, intraarticular and intralesional injection into both animal models and humans. Studies addressing the biodistribution of MSCs in “in vivo” animal models and humans were included. After the search, 109 articles were included in the review. Intravenous administration of MSCs is widely used; it leads to an initial accumulation of cells in the lungs with later redistribution to the liver, spleen and kidneys. Intraarterial infusion bypasses the lungs, so MSCs distribute widely throughout the rest of the body. Intramuscular, intraarticular and intradermal administration lack systemic biodistribution. Injection into various specific organs is also described. Biodistribution of MSCs in animal models and humans appears to be similar and depends on the route of administration. More studies with standardized protocols of MSC administration could be useful in order to make results homogeneous and more comparable.
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Affiliation(s)
- Manuel Sanchez-Diaz
- Dermatology Department, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (M.S.-D.); (T.M.-V.); (A.M.-L.); (S.A.-S.)
| | - Maria I. Quiñones-Vico
- Cellular Production Unit, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (R.S.d.l.T.); (A.S.-S.)
- Correspondence:
| | - Raquel Sanabria de la Torre
- Cellular Production Unit, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (R.S.d.l.T.); (A.S.-S.)
| | - Trinidad Montero-Vílchez
- Dermatology Department, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (M.S.-D.); (T.M.-V.); (A.M.-L.); (S.A.-S.)
| | - Alvaro Sierra-Sánchez
- Cellular Production Unit, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (R.S.d.l.T.); (A.S.-S.)
| | - Alejandro Molina-Leyva
- Dermatology Department, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (M.S.-D.); (T.M.-V.); (A.M.-L.); (S.A.-S.)
| | - Salvador Arias-Santiago
- Dermatology Department, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (M.S.-D.); (T.M.-V.); (A.M.-L.); (S.A.-S.)
- Cellular Production Unit, Hospital Universitario Virgen de las Nieves, IBS Granada, 18014 Granada, Spain; (R.S.d.l.T.); (A.S.-S.)
- School of Medicine, University of Granada, 18014 Granada, Spain
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The Renal Extracellular Matrix as a Supportive Scaffold for Kidney Tissue Engineering: Progress and Future Considerations. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2021; 1345:103-118. [PMID: 34582017 DOI: 10.1007/978-3-030-82735-9_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
During the past decades, diverse methods have been used toward renal tissue engineering in order to replace renal function. The goals of all these techniques included the recapitulation of renal filtration, re-absorptive, and secretary functions, and replacement of endocrine/metabolic activities. It is also imperative to develop a reliable, up scalable, and timely manufacturing process. Decellularization of the kidney with intact ECM is crucial for in-vivo compatibility and targeted clinical application. Contemporarily there is an increasing interest and research in the field of regenerative medicine including stem cell therapy and tissue bioengineering in search for new and reproducible sources of kidneys. In this chapter, we sought to determine the most effective method of renal decellularization and recellularization with emphasis on biologic composition and support of stem cell growth. Current barriers and limitations of bioengineered strategies will be also discussed, and strategies to overcome these are suggested.
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Stem cell delivery to kidney via minimally invasive ultrasound-guided renal artery injection in mice. Sci Rep 2020; 10:7514. [PMID: 32372054 PMCID: PMC7200714 DOI: 10.1038/s41598-020-64417-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 04/10/2020] [Indexed: 12/22/2022] Open
Abstract
Cell-based therapies are promising treatments for various kidney diseases. However, the major hurdle in initiating therapeutic responses is the inefficiency of injection routes to deliver cells to the kidney parenchyma. Systemic injection, such as intravenous injection only delivers a small proportion of cells to the kidney. Whereas direct delivery, such as renal artery injection requires surgical procedures. A minimally invasive renal artery injection was therefore developed to enhance cell delivery to kidney. In this study, luciferase expressing human adipocyte derived stem cells (ADSC) were labelled with gold nanorods (GNR) and injected into the renal artery using ultrasound guidance. The ADSCs were tracked using bioluminescence and photoacoustic imaging serially over 7 days. Imaging confirmed that the majority of signal was within the kidney, indicative of successful injection and that the cells remained viable for 3 days. Histology showed co-localization of GNRs with ADSC staining throughout the kidney with no indication of injury caused by injection. These findings demonstrate that ultrasound-guided renal artery injection is feasible in mice and can successfully deliver a large proportion of cells which are retained within the kidney for 3 days. Therefore, the techniques developed here will be useful for optimising cell therapy in kidney diseases.
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