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Zook HN, Quijano JC, Ortiz JA, Donohue C, Lopez K, Li W, Erdem N, Jou K, Crook CJ, Garcia I, Kandeel F, Montero E, Ku HT. Activation of ductal progenitor-like cells from adult human pancreas requires extracellular matrix protein signaling. iScience 2024; 27:109237. [PMID: 38433896 PMCID: PMC10904999 DOI: 10.1016/j.isci.2024.109237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 12/22/2023] [Accepted: 02/09/2024] [Indexed: 03/05/2024] Open
Abstract
Ductal progenitor-like cells are a sub-population of ductal cells in the adult human pancreas that have the potential to contribute to regenerative medicine. However, the microenvironmental cues that regulate their activation are poorly understood. Here, we establish a 3-dimensional suspension culture system containing six defined soluble factors in which primary human ductal progenitor-like and ductal non-progenitor cells survive but do not proliferate. Expansion and polarization occur when suspension cells are provided with a low concentration (5% v/v) of Matrigel, a sarcoma cell product enriched in many extracellular matrix (ECM) proteins. Screening of ECM proteins identified that collagen IV can partially recapitulate the effects of Matrigel. Inhibition of integrin α1β1, a major collagen IV receptor, negates collagen IV- and Matrigel-stimulated effects. These results demonstrate that collagen IV is a key ECM protein that stimulates the expansion and polarization of human ductal progenitor-like and ductal non-progenitor cells via integrin α1β1 receptor signaling.
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Affiliation(s)
- Heather N. Zook
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Janine C. Quijano
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Jose A. Ortiz
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Cecile Donohue
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Kassandra Lopez
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Wendong Li
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Neslihan Erdem
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Kevin Jou
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Christiana J. Crook
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Isaac Garcia
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Fouad Kandeel
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Enrique Montero
- Department of Diabetes Immunology, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
| | - Hsun Teresa Ku
- Irell & Manella Graduate School of Biological Sciences, City of Hope National Medical Center, Duarte, CA 91010, USA
- Department of Translational Research and Cellular Therapeutics, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA 91010, USA
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2
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Quijano JC, Wedeken L, Ortiz JA, Zook HN, LeBon JM, Luo A, Rawson J, Tremblay JR, Mares JM, Lopez K, Chen MH, Jou K, Mendez-Dorantes C, Al-Abdullah IH, Thurmond DC, Kandeel F, Riggs AD, Ku HT. Methylcellulose colony assay and single-cell micro-manipulation reveal progenitor-like cells in adult human pancreatic ducts. Stem Cell Reports 2023; 18:618-635. [PMID: 36868230 PMCID: PMC10031308 DOI: 10.1016/j.stemcr.2023.02.001] [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: 02/21/2022] [Revised: 01/31/2023] [Accepted: 02/01/2023] [Indexed: 03/05/2023] Open
Abstract
Progenitor cells capable of self-renewal and differentiation in the adult human pancreas are an under-explored resource for regenerative medicine. Using micro-manipulation and three-dimensional colony assays we identify cells within the adult human exocrine pancreas that resemble progenitor cells. Exocrine tissues were dissociated into single cells and plated into a colony assay containing methylcellulose and 5% Matrigel. A subpopulation of ductal cells formed colonies containing differentiated ductal, acinar, and endocrine lineage cells, and expanded up to 300-fold with a ROCK inhibitor. When transplanted into diabetic mice, colonies pre-treated with a NOTCH inhibitor gave rise to insulin-expressing cells. Both colonies and primary human ducts contained cells that simultaneously express progenitor transcription factors SOX9, NKX6.1, and PDX1. In addition, in silico analysis identified progenitor-like cells within ductal clusters in a single-cell RNA sequencing dataset. Therefore, progenitor-like cells capable of self-renewal and tri-lineage differentiation either pre-exist in the adult human exocrine pancreas, or readily adapt in culture.
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Affiliation(s)
- Janine C Quijano
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA.
| | - Lena Wedeken
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jose A Ortiz
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Heather N Zook
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Jeanne M LeBon
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Angela Luo
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jeffrey Rawson
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jacob R Tremblay
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Jacob M Mares
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Kassandra Lopez
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Min-Hsuan Chen
- Integrative Genomics Core, City of Hope, Duarte, CA 91010, USA
| | - Kevin Jou
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Carlos Mendez-Dorantes
- Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
| | - Ismail H Al-Abdullah
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA
| | - Debbie C Thurmond
- Department of Molecular & Cellular Endocrinology, City of Hope, Duarte, CA 91010, USA
| | - Fouad Kandeel
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Department of Clinical Diabetes, Endocrinology & Metabolism, City of Hope, Duarte, CA 91010, USA
| | - Arthur D Riggs
- Department of Diabetes & Drug Discovery, City of Hope, Duarte, CA 91010, USA
| | - Hsun Teresa Ku
- Department of Translational Research & Cellular Therapeutics, City of Hope, 1500 E. Duarte Road, Duarte, CA 91010, USA; Irell and Manella Graduate School of Biological Sciences, City of Hope, Duarte, CA 91010, USA
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3
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Komatsu H, Qi M, Gonzalez N, Salgado M, Medrano L, Rawson J, Orr C, Omori K, Isenberg JS, Kandeel F, Mullen Y, Al-Abdullah IH. A Multiparametric Assessment of Human Islets Predicts Transplant Outcomes in Diabetic Mice. Cell Transplant 2021; 30:9636897211052291. [PMID: 34628956 PMCID: PMC8504220 DOI: 10.1177/09636897211052291] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Prior to transplantation into individuals with type 1 diabetes, in vitro assays are used to evaluate the quality, function and survival of isolated human islets. In addition to the assessments of these parameters in islet, they can be evaluated by multiparametric morphological scoring (0–10 points) and grading (A, B, C, D, and F) based on islet characteristics (shape, border, integrity, single cells, and diameter). However, correlation between the multiparametric assessment and transplantation outcome has not been fully elucidated. In this study, 55 human islet isolations were scored using this multiparametric assessment. The results were correlated with outcomes after transplantation into immunodeficient diabetic mice. In addition, the multiparametric assessment was compared with oxygen consumption rate of isolated islets as a potential prediction factor for successful transplantations. All islet batches were assessed and found to score: 9 points (n = 18, Grade A), 8 points (n = 19, Grade B), and 7 points (n = 18, Grade B). Islets that scored 9 (Grade A), scored 8 (Grade B) and scored 7 (Grade B) were transplanted into NOD/SCID mice and reversed diabetes in 81.2%, 59.4%, and 33.3% of animals, respectively (P < 0.0001). Islet scoring and grading correlated well with glycemic control post-transplantation (P < 0.0001) and reversal rate of diabetes (P < 0.05). Notably, islet scoring and grading showed stronger correlation with transplantation outcome compared to oxygen consumption rate. Taken together, a multiparametric assessment of isolated human islets was highly predictive of transplantation outcome in diabetic mice.
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Affiliation(s)
- Hirotake Komatsu
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA.,Equal contribution
| | - Meirigeng Qi
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA.,Equal contribution
| | - Nelson Gonzalez
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Mayra Salgado
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Leonard Medrano
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Jeffrey Rawson
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Chris Orr
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Keiko Omori
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Jeffrey S Isenberg
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Fouad Kandeel
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Yoko Mullen
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
| | - Ismail H Al-Abdullah
- Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope National Medical Center, Duarte, CA, USA
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4
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Corrales N, Park S, Lau H, Xu I, Luong C, Rodriguez S, Mönch J, Alexander M, Lakey JR. Comparison of Islet Characterization from Use of Standard Crude Collagenase to GMP-Grade Collagenase Enzyme Blends in Preweaned Porcine Islet Isolations. Cell Transplant 2021; 29:963689720977835. [PMID: 33267618 PMCID: PMC7873766 DOI: 10.1177/0963689720977835] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
For the advancement of porcine xenotransplantation for clinical use in type 1 diabetes mellitus, the concerns of a sustainable and safe digestion enzyme blend must be overcome. Incorporating good manufacturing practices (GMP) can facilitate this through utilizing GMP-grade enzymes. In conjunction, still taking into account the cost-effectiveness, a wide concern. We evaluated how GMP-grade enzyme blends impact our piglet islets and their long-term effects. Preweaned porcine islets (PPIs) were isolated from 8- to 10-day-old pigs. Digestion enzyme blends, collagenase type V (Type V), collagenase AF-1 GMP-grade with collagenase NB 6 GMP-grade (AF-1 and NB 6), and collagenase AF-1 GMP-grade with collagenase neutral protease AF GMP-grade (AF-1 and NP AF) were compared. Islet quality control assessments, islet yield, viability, and function, were performed on days 3 and 7, and cell content was performed on day 7. GMP-grade AF-1 and NB 6 (17,209 ± 2,730 islet equivalent per gram of pancreatic tissue [IE/g] on day 3, 9,001 ± 1,034 IE/g on day 7) and AF-1 and NP AF (17,214 ± 3,901 IE/g on day 3, 8,833 ± 2,398 IE/g on day 7) showed a significant increase in islet yield compared to Type V (4,618 ± 1,240 IE/g on day 3, 1,923 ± 704 IE/g on day 7). Islet size, viability, and function showed comparable results in all enzyme blends. There was no significant difference in islet cellular content between enzyme blends. This study demonstrated a comparison of GMP-grade collagenase enzyme blends and a standard crude collagenase enzyme in preweaned-aged porcine, a novel topic in this age. GMP-grade enzyme blends of AF-1 and NB 6 and AF-1 and NP AF resulted in substantially higher yields and as effective PPIs compared to Type V. In the long run, considering costs, integrity, and sustainability, GMP-grade enzyme blends are more favorable for clinical application due to high reproducibility in comparison to undefined manufacturing processes of standard enzymes.
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Affiliation(s)
- Nicole Corrales
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Soomin Park
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Hien Lau
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Ivana Xu
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Colleen Luong
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Samuel Rodriguez
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Johanna Mönch
- Nordmark Arzneimittel GmbH & Co. KG, Uetersen, Germany
| | - Michael Alexander
- Department of Surgery, University of California Irvine, Orange, CA, USA
| | - Jonathan Rt Lakey
- Department of Surgery, University of California Irvine, Orange, CA, USA.,Department of Biomedical Engineering, University of California Irvine, CA, USA
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5
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Kwak K, Park JK, Shim J, Ko N, Kim HJ, Lee Y, Kim JH, Alexander M, Lakey JRT, Kim H, Choi K. Comparison of islet isolation result and clinical applicability according to GMP-grade collagenase enzyme blend in adult porcine islet isolation and culture. Xenotransplantation 2021; 28:e12703. [PMID: 34176167 PMCID: PMC8459292 DOI: 10.1111/xen.12703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 06/06/2021] [Accepted: 06/09/2021] [Indexed: 12/11/2022]
Abstract
Background Porcine islet xenotransplantation is a promising treatment for type 1 diabetes as an alternative to human pancreatic islet transplantation and long‐term insulin therapy. Several research groups have explored porcine islets as an alternative to the inconsistent and chronic shortage of pancreases from human organ donors. Studies have confirmed successful transplant of porcine islets into non‐human primate models of diabetes; however, in most cases, they require more than one adult porcine donor to achieve sufficient viable islet mass for sustained function. The importance of GMP‐grade reagents includes the following: specific enzymes utilized in the pancreatic isolation process were identified as a key factor in successful human clinical islet transplantation trials using cadaveric islets. As xenotransplantation clinical research progresses, isolation reagents and digestion enzymes play a key role in the consistency of the product and ultimately the outcome of the islet xenotransplant. In this study, we evaluated several commercially available enzyme blends that have been used for islet isolation. We evaluated their impact on islet isolation yield and subsequent islet function as part of our plan to bring xenotransplantation into clinical xenotransplantation trials. Methods Adult porcine islets were isolated from 16 to 17‐month‐old Yucatan miniature pigs following standard rapid procurement. Pigs weighed on average 48.71 ± 2.85 kg, and the produced pancreases were 39.51 ± 1.80 grams (mean ± SEM). After ductal cannulation, we evaluated both GMP‐grade enzymes (Collagenase AF‐1 GMP grade and Liberase MTF C/T GMP grade) and compared with standard non‐GMP enzyme blend (Collagenase P). Islet quality control assessments including islet yield, islet size (IEQ), membrane integrity (acridine orange/propidium iodide), and functional viability (GSIS) were evaluated in triplicate on day 1 post‐islet isolation culture. Results Islet yield was highest in the group of adult pigs where Collagenase AF‐1 GMP grade was utilized. The mean islet yield was 16 586 ± 1391 IEQ/g vs 8302 ± 986 IEQ/g from pancreases isolated using unpurified crude Collagenase P. The mean islet size was higher in Collagenase AF‐1 GMP grade with neutral protease than in Collagenase P and Liberase MTF C/T GMP grade. We observed no significant difference between the experimental groups, but in vitro islet function after overnight tissue culture was significantly higher in Collagenase AF‐1 GMP grade with neutral protease and Liberase MTF C/T GMP grade than the crude control enzyme group. As expected, the GMP‐grade enzyme has significantly lower endotoxin levels than the crude control enzyme group when measured. Conclusions This study validates the importance of using specifically blended GMP grade for adult pig islet isolation for xenotransplantation trials and the ability to isolate a sufficient number of viable islets from one adult pig to provide a sufficient number for islets for a clinical islet transplantation. GMP‐grade enzymes are highly efficient in increasing islet yield, size, viability, and function at a lower and acceptable endotoxin level. Ongoing research transplants these islets into animal models of diabetes to validate in vivo function. Also, these defined and reproducible techniques using GMP‐grade enzymes allow for continuance of our plan to advance to xenotransplantation of isolated pig islets for the treatment of type 1 diabetes.
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Affiliation(s)
| | | | | | | | | | | | | | - Michael Alexander
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Jonathan R T Lakey
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA.,Department of Surgery, University of California Irvine, Orange, CA, USA
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6
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A Practical Guide to Rodent Islet Isolation and Assessment Revisited. Biol Proced Online 2021; 23:7. [PMID: 33641671 PMCID: PMC7919091 DOI: 10.1186/s12575-021-00143-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/26/2021] [Indexed: 02/06/2023] Open
Abstract
Insufficient insulin secretion is a key component of both type 1 and type 2 diabetes. Since insulin is released by the islets of Langerhans, obtaining viable and functional islets is critical for research and transplantation. The effective and efficient isolation of these small islands of endocrine cells from the sea of exocrine tissue that is the rest of the pancreas is not necessarily simple or quick. Choosing and administering the digestive enzyme, separation of the islets from acinar tissue, and culture of islets are all things that must be considered. The purpose of this review is to provide a history of the development of islet isolation procedures and to serve as a practical guide to rodent islet research for newcomers to islet biology. We discuss key elements of mouse islet isolation including choosing collagenase, the digestion process, purification of islets using a density gradient, and islet culture conditions. In addition, this paper reviews techniques for assessing islet viability and function such as visual assessment, glucose-stimulated insulin secretion and intracellular calcium measurements. A detailed protocol is provided that describes a common method our laboratory uses to obtain viable and functional mouse islets for in vitro study. This review thus provides a strong foundation for successful procurement and purification of high-quality mouse islets for research purposes.
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7
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Loganathan G, Balamurugan AN, Venugopal S. Human pancreatic tissue dissociation enzymes for islet isolation: Advances and clinical perspectives. Diabetes Metab Syndr 2020; 14:159-166. [PMID: 32088647 DOI: 10.1016/j.dsx.2020.01.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 01/26/2020] [Accepted: 01/27/2020] [Indexed: 02/06/2023]
Abstract
BACKGROUND AND AIMS Successful clinical human allo or auto-islet transplantation requires the recovery of a sufficient number of functional islets from either brain-dead or chronic pancreatitis pancreases respectively. METHODS In the last two decades (2000-2019), significant progress has been made in improving the human islet isolation procedures and in standardizing the use of different tissue dissociation enzyme (TDE; a mixture of collagenase and protease enzymes) blends to recover higher islet yields. RESULTS AND CONCLUSIONS This review presents information focusing on properties and role of TDE blends during the islet isolation process, particularly emphasizing on the current developments, associated challenges and future perspectives within the field.
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Affiliation(s)
- Gopalakrishnan Loganathan
- Clinical Islet Cell Laboratory, Cardiovascular Innovation Institute, Department of Surgery, University of Louisville, Louisville, KY, USA; School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India
| | - Appakalai N Balamurugan
- Clinical Islet Cell Laboratory, Cardiovascular Innovation Institute, Department of Surgery, University of Louisville, Louisville, KY, USA
| | - Subhashree Venugopal
- School of Biosciences and Technology, Vellore Institute of Technology, Vellore, India.
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8
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A Feasible Method for Quantifying Living Pancreatic Human Islets in Murine Livers Posttransplantation by Confocal Laser Scanning Microscopy. Transplantation 2020; 104:e144-e150. [PMID: 32080160 DOI: 10.1097/tp.0000000000003191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Current histological methods cannot accurately determine the survival rate of human pancreatic islets following portal vein infusion. This is due, in part, to the low number of infused islets relative to the whole liver. In this study, we assessed the ability of confocal laser scanning microscopy (CLSM) to track human islets posttransplantation. METHODS Immunodeficient mice were transplanted with human islets. Following engraftment, animals were euthanized, livers procured, and human islet β cells immunofluorescently labeled with an insulin-specific antibody and evaluated by CLSM. A calibration curve comparing the area of insulin + hepatic islet β cells to the number of human islets collected was developed. Levels of human C-peptide were measured in transplant recipients to determine islet function. RESULTS The short-term survival rate of islet transplants was defined as y = 0.0422x + 2.7008, in which x is human islet number and y is liver islet β cell area. Employing CLSM, human islets were detected in immunofluorescent labeled murine liver tissue sections posttransplantation. The β cell-relative area of human islets in 500 islet equivalent (IEQ) specimens was 20.21 ± 1.16 mm and in 1000 IEQ specimens 39.4 ± 2.23 mm posttransplantation. Human islet posttransplant survival rates were 82.9 ± 5.50% (500 IEQ group) and 86.9 ± 5.28% (1000 IEQ group). CONCLUSIONS These data indicate that CLSM can be employed to quantify and characterize pancreatic human islets after transplantation to murine livers.
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9
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White AM, Shamul JG, Xu J, Stewart S, Bromberg JS, He X. Engineering Strategies to Improve Islet Transplantation for Type 1 Diabetes Therapy. ACS Biomater Sci Eng 2019; 6:2543-2562. [PMID: 33299929 DOI: 10.1021/acsbiomaterials.9b01406] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Type 1 diabetes is an autoimmune disease in which the immune system attacks insulin-producing beta cells of pancreatic islets. Type 1 diabetes can be treated with islet transplantation; however, patients must be administered immunosuppressants to prevent immune rejection of the transplanted islets if they are not autologous or not engineered with immune protection/isolation. To overcome biological barriers of islet transplantation, encapsulation strategies have been developed and robustly investigated. While islet encapsulation can prevent the need for immunosuppressants, these approaches have not shown much success in clinical trials due to a lack of long-term insulin production. Multiple engineering strategies have been used to improve encapsulation and post-transplantation islet survival. In addition, more efficient islet cryopreservation methods have been designed to facilitate the scaling-up of islet transplantation. Other islet sources have been identified including porcine islets and stem cell-derived islet-like aggregates. Overall, islet-laden capsule transplantation has greatly improved over the past 30 years and is moving towards becoming a clinically feasible treatment for type 1 diabetes.
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Affiliation(s)
- Alisa M White
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - James G Shamul
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Jiangsheng Xu
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Samantha Stewart
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA
| | - Jonathan S Bromberg
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201.,Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201.,Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, Baltimore, MD 21201.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland, Baltimore, MD 21201
| | - Xiaoming He
- Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA.,Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland, Baltimore, MD 21201.,Robert E. Fischell Institute for Biomedical Devices, University of Maryland, College Park, MD 20742, USA, Baltimore, MD 21201, USA
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10
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Khiatah B, Qi M, Du W, T-Chen K, van Megen KM, Perez RG, Isenberg JS, Kandeel F, Roep BO, Ku HT, Al-Abdullah IH. Intra-pancreatic tissue-derived mesenchymal stromal cells: a promising therapeutic potential with anti-inflammatory and pro-angiogenic profiles. Stem Cell Res Ther 2019; 10:322. [PMID: 31730488 PMCID: PMC6858763 DOI: 10.1186/s13287-019-1435-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 09/26/2019] [Accepted: 09/30/2019] [Indexed: 12/19/2022] Open
Abstract
Background Human pancreata contain many types of cells, such as endocrine islets, acinar, ductal, fat, and mesenchymal stromal cells (MSCs). MSCs are important and shown to have a promising therapeutic potential to treat various disease conditions. Methods We investigated intra-pancreatic tissue-derived (IPTD) MSCs isolated from tissue fractions that are routinely discarded during pancreatic islet isolation of human cadaveric donors. Furthermore, whether pro-angiogenic and anti-inflammatory properties of these cells could be enhanced was investigated. Results IPTD-MSCs were expanded in GMP-compatible CMRL-1066 medium supplemented with 5% human platelet lysate (hPL). IPTD-MSCs were found to be highly pure, with > 95% positive for CD90, CD105, and CD73, and negative for CD45, CD34, CD14, and HLA-DR. Immunofluorescence staining of pancreas tissue demonstrated the presence of CD105+ cells in the vicinity of islets. IPTD-MSCs were capable of differentiation into adipocytes, chondrocytes, and osteoblasts in vitro, underscoring their multipotent features. When these cells were cultured in the presence of a low dose of TNF-α, gene expression of tumor necrosis factor alpha-stimulated gene-6 (TSG-6) was significantly increased, compared to control. In contrast, treating cells with dimethyloxallyl glycine (DMOG) (a prolyl 4-hydroxylase inhibitor) enhanced mRNA levels of nuclear factor erythroid 2-related factor 2 (NRF2) and vascular endothelial growth factor (VEGF). Interestingly, a combination of TNF-α and DMOG stimulated the optimal expression of all three genes in IPTD-MSCs. Conditioned medium of IPTD-MSCs treated with a combination of DMOG and TNF-α contained higher levels of pro-angiogenic (VEGF, IL-6, and IL-8) compared to controls, promoting angiogenesis of human endothelial cells in vitro. In contrast, levels of MCP-1, a pro-inflammatory cytokine, were reduced in the conditioned medium of IPTD-MSCs treated with a combination of DMOG and TNF-α. Conclusions The results demonstrate that IPTD-MSCs reside within the pancreas and can be separated as part of a standard islet-isolation protocol. These IPTD-MSCs can be expanded and potentiated ex vivo to enhance their anti-inflammatory and pro-angiogenic profiles. The fact that IPTD-MSCs are generated in a GMP-compatible procedure implicates a direct clinical application.
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Affiliation(s)
- Bashar Khiatah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Meirigeng Qi
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Weiting Du
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Kuan T-Chen
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Kayleigh M van Megen
- Department of Diabetes Immunology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Rachel G Perez
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Jeffrey S Isenberg
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Fouad Kandeel
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Bart O Roep
- Department of Diabetes Immunology, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, CA, USA
| | - Hsun Teresa Ku
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Ismail H Al-Abdullah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA.
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11
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Loganathan G, Subhashree V, Narayanan S, Tweed B, Goedde MA, Gunaratnam B, Tucker WW, Goli P, Mokshagundam S, McCarthy RC, Williams SK, Hughes MG, Balamurugan AN. Improved recovery of human islets from young donor pancreases utilizing increased protease dose to collagenase for digesting peri-islet extracellular matrix. Am J Transplant 2019; 19:831-843. [PMID: 30203908 DOI: 10.1111/ajt.15111] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 08/21/2018] [Accepted: 08/28/2018] [Indexed: 01/25/2023]
Abstract
Human islet isolation from young donor pancreases (YDP) utilizing the current purified standard dose of collagenase-protease enzyme mixtures often results in the release of a high percentage of mantled islets. Mantled islets are those surrounded by exocrine tissue and are difficult to purify by density gradient centrifugation, leading to poor islet recovery. Based on difference in extracellular matrix, and total collagen content between YDP and old donor pancreas (ODP, > 35 Y) led us to compare results from islet isolation using increased collagenase combination (ICC) or increased protease combination (IPC), to the standard enzyme combination (SEC) in a "trisected" pancreas model to overcome the donor-to-donor variability. These results showed a reduced percentage of mantled islets (17% ± 7.5%) and higher postpurification islet recovery (83.8% ± 5.6%) with IPC. Furthermore, these results were confirmed in 13 consecutive whole pancreas islet isolations utilizing IPC from VitaCyte, Roche, or SERVA collagenase-protease enzyme mixtures. Results obtained from in vitro and in vivo islet functional assessment indicated that islets isolated using IPC retained normal islet morphology, insulin secretion, and the ability to reverse diabetes after transplantation in diabetic nude mice. This is the first report utilizing trisected pancreas to assess the effectiveness of different enzyme combinations to improve islet recovery from young donor pancreases.
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Affiliation(s)
- Gopalakrishnan Loganathan
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | | | - Siddharth Narayanan
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | - Benjamin Tweed
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | - Michael Andrew Goedde
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | - Bakeerathan Gunaratnam
- Department of Bioinformatics and Biostatistics, University of Louisville, Louisville, KY, USA
| | - William W Tucker
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | - Praneeth Goli
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | | | | | - Stuart K Williams
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA.,Department of Physiology, University of Louisville, Louisville, KY, USA
| | - Michael G Hughes
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
| | - Appakalai N Balamurugan
- Clinical Islet Laboratory, Department of Surgery, Cardiovascular Innovation Institute, University of Louisville, Louisville, KY, USA
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12
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Khiatah B, Tucker A, Chen KT, Perez R, Bilbao S, Valiente L, Medrano L, Rawson J, Forouhar E, Omori K, Kandeel F, Qi M, Al-Abdullah IH. Evaluation of collagenase gold plus BP protease in isolating islets from human pancreata. Islets 2018; 10:51-59. [PMID: 29381419 PMCID: PMC5895173 DOI: 10.1080/19382014.2017.1417716] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Selection of enzymes for optimal pancreas digestion is essential for successful human islet isolations. The aim of this study was to evaluate the efficacy and outcome of using Collagenase Gold plus BP protease (VitaCyte) (n = 8) by comparing it to two commercially available enzymes, Liberase MTF C/T (Roche) (n = 48) and Collagenase NB1/NP (Serva) (n = 15). The isolation outcomes were assessed by islet counting, viability, glucose-stimulated oxygen consumption rate (OCR), and successful graft-rate following transplantation in diabetic NOD scid mice. The pancreas donor characteristics were not significantly different between the tested enzyme groups regarding their BMI, pancreas weight, cold ischemia time (CIT) and HbA1c. The results show that digested tissue volume was not statistically significant between the VitaCyte enzyme (34.25 ± 5.4 mL) and the Roche enzyme (55.25 ± 3.42 mL, p = 0.073), however, this was significant with Serva enzyme (64.07 ± 7.95 mL, p = 0.020). Interestingly, the islet yields were not statistically different between all enzyme groups. Moreover, when islets were transplanted into NOD scid mice, the reversal rate of diabetes for the VitaCyte enzyme group was similar to all enzyme groups. In conclusion, the effectiveness of Collagenase Gold plus BP protease is comparable to the MTF C/T and the Collagenase NB1/NP enzymes; the low cost could facilitate the use of more pancreata for islet isolations.
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Affiliation(s)
- Bashar Khiatah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Amber Tucker
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Kuan-Tsen Chen
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Rachel Perez
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Shiela Bilbao
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Luis Valiente
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Leonard Medrano
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Jeffrey Rawson
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Elena Forouhar
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Keiko Omori
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Fouad Kandeel
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Meirigeng Qi
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
| | - Ismail H. Al-Abdullah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, Duarte, CA, USA
- CONTACT Ismail H. Al-Abdullah Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, 1500 E. Duarte Rd, Duarte, CA 91010
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13
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Loganathan G, Subhashree V, Breite AG, Tucker WW, Narayanan S, Dhanasekaran M, Mokshagundam S, Green ML, Hughes MG, Williams SK, Dwulet FE, McCarthy RC, Balamurugan AN. Beneficial effect of recombinant rC1rC2 collagenases on human islet function: Efficacy of low-dose enzymes on pancreas digestion and yield. Am J Transplant 2018; 18:478-485. [PMID: 29044985 DOI: 10.1111/ajt.14542] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 09/18/2017] [Accepted: 10/03/2017] [Indexed: 01/25/2023]
Abstract
A high number of human islets can be isolated by using modern purified tissue dissociation enzymes; however, this requires the use of >20 Wunsch units (WU)/g of pancreas for digestion. Attempts to reduce this dose have resulted in pancreas underdigestion and poor islet recovery but improved islet function. In this study, we achieved a high number of functional islets using a low dose of recombinant collagenase enzyme mixture (RCEM-1200 WU rC2 and 10 million collagen-degrading activity [CDA] U of rC1 containing about 209 mg of collagenase to digest a 100-g pancreas). The collagenase dose used in these isolations is about 42% of the natural collagenase enzyme mixture (NCEM) dose commonly used to digest a 100-g pancreas. Low-dose RCEM was efficient in digesting entire pancreases to obtain higher yield (5535 ± 830 and 2582 ± 925 islet equivalent/g, P < .05) and less undigested tissue (16.7 ± 5% and 37.8 ± 3%, P < .05) compared with low-dose NCEM (12WU/g). Additionally, low-dose RCEM islets retained better morphology (confirmed with scanning electron microscopy) and higher in vitro basal insulin release (2391 ± 1342 and 1778 ± 978 μU/mL; P < .05) compared with standard-dose NCEM. Nude mouse bioassay demonstrated better islet function for low-dose RCEM (area under the curve [AUC] 24 968) compared with low-dose (AUC-38 225) or standard-dose NCEM (AUC-38 685), P < .05. This is the first report indicating that islet function can be improved by using low-dose rC1rC2 (RCEM).
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Affiliation(s)
- Gopalakrishnan Loganathan
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | | | | | - William W Tucker
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | - Siddharth Narayanan
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | - Maheswaran Dhanasekaran
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | - SriPrakash Mokshagundam
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | | | - Michael G Hughes
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | - Stuart K Williams
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
| | | | | | - Appakalai N Balamurugan
- Center for Cellular Transplantation, Cardiovascular Innovation Institute, Department of Surgery and Endocrinology, University of Louisville, Louisville, KY, USA
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14
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Qi M, Bilbao S, Forouhar E, Kandeel F, Al-Abdullah IH. Encompassing ATP, DNA, insulin, and protein content for quantification and assessment of human pancreatic islets. Cell Tissue Bank 2017; 19:77-85. [PMID: 28916910 PMCID: PMC5829119 DOI: 10.1007/s10561-017-9659-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Accepted: 09/11/2017] [Indexed: 12/11/2022]
Abstract
Islet transplantation has made major progress to treat patients with type 1 diabetes. Islet mass and quality are critically important to ensure successful transplantation. Currently, islet status is evaluated using insulin secretion, oxygen consumption rate, or adenosine triphosphate (ATP) measurement. These parameters are evaluated independently and do not effectively predict islet status post-transplant. Therefore, assessing human pancreatic islets by encompassing ATP, DNA, insulin, and protein content from a single tissue sample would serve as a better predictor for islet status. In this study, a single step procedure for extracting ATP, DNA, insulin, and protein content from human pancreatic islets was described and the biomolecule contents were quantified. Additionally, different mathematical calculations integrating total ATP, DNA, insulin, and protein content were randomly tested under various conditions to predict islet status. The results demonstrated that the ATP assay was efficient and the biomolecules were effectively quantified. Furthermore, the mathematical formula we developed could be optimized to predict islet status. In conclusion, our results indicate a proof-of-concept that a simple logarithmic formula can predict overall islet status for various conditions when total islet ATP, DNA, insulin, and protein content are simultaneously assessed from a single tissue sample.
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Affiliation(s)
- Meirigeng Qi
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Shiela Bilbao
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Elena Forouhar
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Fouad Kandeel
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Ismail H Al-Abdullah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA.
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15
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Al-Abdullah IH, Bagramyan K, Bilbao S, Qi M, Kalkum M. Fluorogenic Peptide Substrate for Quantification of Bacterial Enzyme Activities. Sci Rep 2017; 7:44321. [PMID: 28287171 PMCID: PMC5347087 DOI: 10.1038/srep44321] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Accepted: 02/06/2017] [Indexed: 12/18/2022] Open
Abstract
A novel peptide substrate (A G G P L G P P G P G G) was developed for quantifying the activities of bacterial enzymes using a highly sensitive Fluorescence Resonance Energy Transfer (FRET) based assay. The peptide substrate was cleaved by collagenase class I, II, Liberase MTF C/T, collagenase NB1, and thermolysin/neutral protease, which was significantly enhanced in the presence of CaCl2. However, the activities of these enzymes were significantly decreased in the presence of ZnSO4 or ZnCl2. Collagenase I, II, Liberase MTF C/T, thermolysin/neutral protease share similar cleavage sites, L↓G and P↓G. However, collagenase NB1 cleaves the peptide substrate at G↓P and P↓L, in addition to P↓G. The enzyme activity is pH dependent, within a range of 6.8 to 7.5, but was significantly diminished at pH 8.0. Interestingly, the peptide substrate was not cleaved by endogenous pancreatic protease such as trypsin, chymotrypsin, and elastase. In conclusion, the novel peptide substrate is collagenase, thermolysin/neutral protease specific and can be applied to quantify enzyme activities from different microbes. Furthermore, the assay can be used for fine-tuning reaction mixtures of various agents to enhance the overall activity of a cocktail of multiple enzymes and achieve optimal organ/tissue digestion, while protecting the integrity of the target cells.
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Affiliation(s)
- Ismail H. Al-Abdullah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, USA
| | - Karine Bagramyan
- Department of Molecular Immunology, Beckman Research Institute of the City of Hope, USA
| | - Shiela Bilbao
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, USA
| | - Meirigeng Qi
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of the City of Hope, USA
| | - Markus Kalkum
- Department of Molecular Immunology, Beckman Research Institute of the City of Hope, USA
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Yeh CC, Wang LJ, McGarrigle JJ, Wang Y, Liao CC, Omami M, Khan A, Nourmohammadzadeh M, Mendoza-Elias J, McCracken B, Marchese E, Barbaro B, Oberholzer J. Effect of Manufacturing Procedures on Human Islet Isolation From Donor Pancreata Standardized by the North American Islet Donor Score. Cell Transplant 2016; 26:33-44. [PMID: 27524672 DOI: 10.3727/096368916x692834] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
This study investigates manufacturing procedures that affect islet isolation outcomes from donor pancreata standardized by the North American Islet Donor Score (NAIDS). Islet isolations performed at the University of Illinois, Chicago, from pancreata with NAIDS ≥65 were investigated. The research cohort was categorized into two groups based on a postpurification yield either greater than (group A) or less than (group B) 400,000 IEQ. Associations between manufacturing procedures and islet isolation outcomes were analyzed using multivariate logistic or linear regressions. A total of 119 cases were retrieved from 630 islet isolations performed since 2003. Group A is composed of 40 cases with an average postpurified yield of 570,098 IEQ, whereas group B comprised 79 cases with an average yield of 235,987 IEQ. One third of 119 cases were considered successful islet isolations that yielded >400,000 IEQ. The prepurified and postpurified islet product outcome parameters were detailed for future reference. The NAIDS (>80 vs. 65-80) [odds ratio (OR): 2.91, 95% confidence interval (CI): 1.27-6.70], cold ischemic time (≤10 vs. >10 h) (OR: 3.68, 95% CI: 1.61-8.39), and enzyme perfusion method (mechanical vs. manual) (OR: 2.38, 95% CI: 1.01-5.56) were independent determinants for postpurified islet yield ≥400,000 IEQ. The NAIDS (>80, p < 0.001), cold ischemic time (≤10 h, p < 0.05), increased unit of collagenase (p < 0.01), and pancreatic duct cannulation time (<30 min, p < 0.01) all independently correlated with better islet quantity parameters. Furthermore, cold ischemic time (≤10 h, p < 0.05), liberase MTF (p < 0.001), increased unit of collagenase (p < 0.05), duct cannulation time (<30 min, p < 0.05), and mechanical enzyme perfusion (p < 0.05) were independently associated with better islet morphology score. Analysis of islet manufacturing procedures from the pancreata with standardized quality is essential in identifying technical issues within islet isolation. Adequate processing duration in each step of islet isolation, using liberase MTF, and mechanical enzyme perfusion all affect isolation outcomes.
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Optimizing Porcine Islet Isolation to Markedly Reduce Enzyme Consumption Without Sacrificing Islet Yield or Function. Transplant Direct 2016; 2:e86. [PMID: 27830180 PMCID: PMC5087567 DOI: 10.1097/txd.0000000000000599] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 04/22/2016] [Accepted: 04/24/2016] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Human allogeneic islet transplantation for treatment of type 1 diabetes provides numerous clinical benefits, such as fewer episodes of hypoglycemic unawareness and tighter control of blood glucose levels. Availability of human pancreas for clinical and research use, however, is severely limited. Porcine pancreas offers an abundant source of tissue for optimization of islet isolation methodology and future clinical transplantation, thereby increasing patient access to this potentially lifesaving procedure. METHODS Porcine islet isolations were performed using varying amounts of collagenase (7.5, 3.75, or 2.5 Wunsch units per gram tissue) and neutral protease activity (12 000, 6000, or 4000 neutral protease units per gram tissue) and perfusion volumes (1.7 or 0.85 mL/g tissue) to assess their effects on isolation outcomes. Retention of dissociative enzymes within the pancreas during perfusion and digestion was evaluated, along with distribution of the perfusion solution within the tissue. RESULTS Reducing enzyme usage by as much as 67% and perfusion volume by 50% led to equally successful islet isolation outcomes when compared with the control group (48 ± 7% of tissue digested and 1088 ± 299 islet equivalents per gram of pancreas vs 47 ± 11% and 1080 ± 512, respectively). Using margin-marking dye in the perfusion solution to visualize enzyme distribution demonstrated that increasing perfusion volume did not improve tissue infiltration. CONCLUSIONS Current protocols for porcine islet isolation consume excessive amounts of dissociative enzymes, elevating cost and limiting research and development. These data demonstrate that islet isolation protocols can be optimized to significantly reduce enzyme usage while maintaining yield and function and thus accelerating progress toward clinical application.
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Prophylactically Decontaminating Human Islet Product for Safe Clinical Application: Effective and Potent Method. Transplant Direct 2016; 2:e63. [PMID: 26894230 PMCID: PMC4754204 DOI: 10.1097/txd.0000000000000574] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Background Transplanting pancreatic islets into recipients must be safe and effective to treat type 1 diabetes. Islet quality and quantity are important; however, the final product must also be free from microbial contamination and low endotoxin levels. Methods This study explored a method to eliminate contamination in manufacturing islets for transplantation. A simple (single antibiotic n = 164) and refined (triple antimicrobial agents, n = 279) pancreas decontaminating methods were used to test their effects on reducing the contamination rates in the islet final product. A total of 443 pancreata were processed for islet isolations. Three samples for microbial tests (Gram stain, aerobic, and anaerobic culture) were taken at preprocess (pancreas preservation), postisolation, and postculture. Endotoxin levels were measured only for islets considered for transplantation. Results Of 443 pancreata used for islet isolation, 79 (17.8%) showed signs of contamination in preprocess samples; 10 (2.3%) were contaminated in both preprocess and in the final product (postisolation and postculture) samples. Contamination rates in which preprocess and final product samples were positive for contamination was significantly lower using the refined method (refined vs simple method: 5% vs 20.5%, P = 0.045). Identical microbial species were present in both preprocess and in the final product. Conclusions This study demonstrated that the refined method reduces the rate of contamination of the islet final product and is safe for clinical application. Moreover, it may be used as a standard method during human islet manufacturing facilitating the application of a biological license agreement from United States Food and Drug Administration.
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Hawthorne WJ, Williams L, Chew YV. Clinical Islet Isolation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 938:89-122. [PMID: 27586424 DOI: 10.1007/978-3-319-39824-2_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The overarching success of islet transplantation relies on the success in the laboratory to isolate the islets. This chapter focuses on the processes of human islet cell isolation and the ways to optimally provide islet cells for transplantation. The major improvements in regards to the choice of enzyme type, way the digested pancreas tissue is handled to best separate islets from the acinar and surrounding tissues, the various methods of purification of the islets, their subsequent culture and quality assurance to improve outcomes to culminate in safe and effective islet transplantation will be discussed. After decades of improvements, islet cell isolation and transplantation now clearly offer a safe, effective and feasible therapeutic treatment option for an increasing number of patients suffering from type 1 diabetes specifically for those with severe hypoglycaemic unawareness.
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Affiliation(s)
- Wayne J Hawthorne
- National Pancreas and Islet Transplant Laboratories, The Westmead Institute for Medical Research, Westmead, NSW, 2145, Australia. .,Department of Surgery, Westmead Clinical School, Westmead Hospital, University of Sydney, Westmead, NSW, 2145, Australia.
| | - Lindy Williams
- National Pancreas and Islet Transplant Laboratories, The Westmead Institute for Medical Research, Westmead, NSW, 2145, Australia
| | - Yi Vee Chew
- National Pancreas and Islet Transplant Laboratories, The Westmead Institute for Medical Research, Westmead, NSW, 2145, Australia
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