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Valentini CG, Pellegrino C, Teofili L. Pros and Cons of Cryopreserving Allogeneic Stem Cell Products. Cells 2024; 13:552. [PMID: 38534396 DOI: 10.3390/cells13060552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 03/16/2024] [Accepted: 03/18/2024] [Indexed: 03/28/2024] Open
Abstract
The COVID-19 pandemic has precipitously changed the practice of transplanting fresh allografts. The safety measures adopted during the pandemic prompted the near-universal graft cryopreservation. However, the influence of cryopreserving allogeneic grafts on long-term transplant outcomes has emerged only in the most recent literature. In this review, the basic principles of cell cryopreservation are revised and the effects of cryopreservation on the different graft components are carefully reexamined. Finally, a literature revision on studies comparing transplant outcomes in patients receiving cryopreserved and fresh grafts is illustrated.
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Affiliation(s)
- Caterina Giovanna Valentini
- Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, 00168 Rome, Italy
| | - Claudio Pellegrino
- Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, 00168 Rome, Italy
- Sezione di Ematologia, Dipartimento di Scienze Radiologiche ed Ematologiche, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
| | - Luciana Teofili
- Dipartimento di Diagnostica per Immagini, Radioterapia Oncologica ed Ematologia, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, 00168 Rome, Italy
- Sezione di Ematologia, Dipartimento di Scienze Radiologiche ed Ematologiche, Università Cattolica del Sacro Cuore, 00168 Rome, Italy
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2
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Parihar A, Kumar A, Panda U, Khan R, Parihar DS, Khan R. Cryopreservation: A Comprehensive Overview, Challenges, and Future Perspectives. Adv Biol (Weinh) 2023; 7:e2200285. [PMID: 36755194 DOI: 10.1002/adbi.202200285] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 01/05/2023] [Indexed: 02/10/2023]
Abstract
Cryopreservation is the most prevalent method of long-term cell preservation. Effective cell cryopreservation depends on freezing, adequate storage, and correct thawing techniques. Recent advances in cryopreservation techniques minimize the cellular damage which occurs while processing samples. This article focuses on the fundamentals of cryopreservation techniques and how they can be implemented in a variety of clinical settings. The article presents a brief description of each of the standard cryopreservation procedures, such as slow freezing and vitrification. Alongside that, the membrane permeating and nonpermeating cryoprotectants are briefly discussed, along with current advancements in the field of cryopreservation and variables influencing the cryopreservation process. The diminution of cryoinjury incurred by the cell via the resuscitation process will also be highlighted. In the end application of cryopreservation techniques in many fields, with a special emphasis on stem cell preservation techniques and current advancements presented. Furthermore, the challenges while implementing cryopreservation and the futuristic scope of the fields are illustrated herein. The content of this review sheds light on various ways to enhance the output of the cell preservation process and minimize cryoinjury while improving cell revival.
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Affiliation(s)
- Arpana Parihar
- Industrial Waste Utilization, Nano and Biomaterials, CSIR-Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, Madhya Pradesh, 462026, India
| | - Avinash Kumar
- Department of Mechanical Engineering, Indian Institute of Information Technology, Design & Manufacturing (IIITD&M), Kancheepuram, 600127, India
| | - Udwesh Panda
- Department of Mechanical Engineering, Indian Institute of Information Technology, Design & Manufacturing (IIITD&M), Kancheepuram, 600127, India
| | - Rukhsar Khan
- Department of Biosciences, Barkatullah University, Bhopal, Madhya Pradesh, 462026, India
| | | | - Raju Khan
- Industrial Waste Utilization, Nano and Biomaterials, CSIR-Advanced Materials and Processes Research Institute (AMPRI), Hoshangabad Road, Bhopal, Madhya Pradesh, 462026, India
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3
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Araújo AB, Salton GD, Angeli MH, Furlan JM, Schmalfuss T, Röhsig LM. Effects of cell concentration, time of fresh storage, and cryopreservation on peripheral blood stem cells: PBSC fresh storage and cryopreservation. Transfus Apher Sci 2021; 61:103298. [PMID: 34696981 DOI: 10.1016/j.transci.2021.103298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Revised: 10/14/2021] [Accepted: 10/17/2021] [Indexed: 10/20/2022]
Abstract
INTRODUCTION Peripheral blood stem cells are widely used in autologous or allogeneic transplantation. The quality of the product directly impacts clinical outcomes, and the cell quality and/or functionality may be influenced by the storage conditions as time, temperature, total nucleated cells (TNC) concentration and cryopreservation requirement. OBJECTIVE To verify the effects of time, cell concentration, and cryopreservation/thawing in the viability and functionality of stem cells for transplantation. METHODS We evaluated TNC, CD45+ viable cells, CD34+ viable cells, and cell viability and functionality of 11 samples. Measurements were performed immediately and 24 h, 48 h, 72 h, and 96 h after sample collection at high and low TNC concentrations. The same parameters were also evaluated after cryopreservation and thawing of the samples. RESULT Duration of storage and TNC concentration exhibited a negative effect on cell quality (CD45+ viable cells, CD34+ viable cells and functionality). Moreover, the association of these parameters increased the negative effect on graft quality. Cryopreservation and thawing also negatively affected the collected sample regarding viable CD34+ cells (recovery 66.2 %), viable CD45+ cells (recovery 56.8 %), and 7-AAD viability. No significant losses in viable CD45+/CD34+ cells and functionality were observed in the first 24 h in both TNC conditions. CONCLUSION These results emphasize the importance to consider carefully the storage conditions until transplantation, measuring TNC/μL until 24 h after collection (diluting the product when TNC > 300 × 103/μL) and infusing fresh graft as soon as possible.
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Affiliation(s)
- Anelise B Araújo
- Centro de Processamento Celular, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350, Porto Alegre, RS, 90035-903, Brazil.
| | - Gabrielle D Salton
- Centro de Processamento Celular, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350, Porto Alegre, RS, 90035-903, Brazil.
| | - Melissa H Angeli
- Centro de Processamento Celular, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350, Porto Alegre, RS, 90035-903, Brazil.
| | - Juliana M Furlan
- Centro de Processamento Celular, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350, Porto Alegre, RS, 90035-903, Brazil.
| | - Tissiana Schmalfuss
- Centro de Processamento Celular, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350, Porto Alegre, RS, 90035-903, Brazil.
| | - Liane M Röhsig
- Centro de Processamento Celular, Hospital de Clínicas de Porto Alegre, Rua Ramiro Barcelos 2350, Porto Alegre, RS, 90035-903, Brazil.
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Erol OD, Pervin B, Seker ME, Aerts-Kaya F. Effects of storage media, supplements and cryopreservation methods on quality of stem cells. World J Stem Cells 2021; 13:1197-1214. [PMID: 34630858 PMCID: PMC8474714 DOI: 10.4252/wjsc.v13.i9.1197] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/21/2021] [Accepted: 08/24/2021] [Indexed: 02/06/2023] Open
Abstract
Despite a vast amount of different methods, protocols and cryoprotective agents (CPA), stem cells are often frozen using standard protocols that have been optimized for use with cell lines, rather than with stem cells. Relatively few comparative studies have been performed to assess the effects of cryopreservation methods on these stem cells. Dimethyl sulfoxide (DMSO) has been a key agent for the development of cryobiology and has been used universally for cryopreservation. However, the use of DMSO has been associated with in vitro and in vivo toxicity and has been shown to affect many cellular processes due to changes in DNA methylation and dysregulation of gene expression. Despite studies showing that DMSO may affect cell characteristics, DMSO remains the CPA of choice, both in a research setting and in the clinics. However, numerous alternatives to DMSO have been shown to hold promise for use as a CPA and include albumin, trehalose, sucrose, ethylene glycol, polyethylene glycol and many more. Here, we will discuss the use, advantages and disadvantages of these CPAs for cryopreservation of different types of stem cells, including hematopoietic stem cells, mesenchymal stromal/stem cells and induced pluripotent stem cells.
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Affiliation(s)
- Ozgur Dogus Erol
- Department of Stem Cell Sciences, Hacettepe University Graduate School of Health Sciences, Ankara 06100, Turkey
- Center for Stem Cell Research and Development, Hacettepe University, Ankara 06100, Turkey
| | - Burcu Pervin
- Department of Stem Cell Sciences, Hacettepe University Graduate School of Health Sciences, Ankara 06100, Turkey
- Center for Stem Cell Research and Development, Hacettepe University, Ankara 06100, Turkey
| | - Mehmet Emin Seker
- Department of Stem Cell Sciences, Hacettepe University Graduate School of Health Sciences, Ankara 06100, Turkey
- Center for Stem Cell Research and Development, Hacettepe University, Ankara 06100, Turkey
| | - Fatima Aerts-Kaya
- Department of Stem Cell Sciences, Hacettepe University Graduate School of Health Sciences, Ankara 06100, Turkey
- Center for Stem Cell Research and Development, Hacettepe University, Ankara 06100, Turkey
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Lysak D, Brychtová M, Leba M, Čedíková M, Georgiev D, Jindra P, Vlas T, Holubova M. Long-Term Cryopreservation Does Not Affect Quality of Peripheral Blood Stem Cell Grafts: A Comparative Study of Native, Short-Term and Long-Term Cryopreserved Haematopoietic Stem Cells. Cell Transplant 2021; 30:9636897211036004. [PMID: 34328022 PMCID: PMC8327011 DOI: 10.1177/09636897211036004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Cryopreserved haematopoietic progenitor cells are used to restore autologous haematopoiesis after high dose chemotherapy. Although the cells are routinely stored for a long period, concerns remain about the maximum storage time and the possible negative effect of storage on their potency. We evaluated the effect of cryopreservation on the quality of peripheral stem cell grafts stored for a short (3 months) and a long (10 years) period and we compared it to native products.The viability of CD34+ cells remained unaffected during storage, the apoptotic cells were represented up to 10% and did not differ between groups. The clonogenic activity measured by ATP production has decreased with the length of storage (ATP/cell 1.28 nM in native vs. 0.63 in long term stored products, P < 0.05). Only borderline changes without statistical significance were detected when examining mitochondrial and aldehyde dehydrogenase metabolic activity and intracellular pH, showing their good preservation during cell storage. Our experience demonstrates that cryostorage has no major negative effect on stem cell quality and potency, and therefore autologous stem cells can be stored safely for an extended period of at least 10 years. On the other hand, long term storage for 10 years and longer may lead to mild reduction of clonogenic capacity. When a sufficient dose of stem cells is infused, these changes will not have a clinical impact. However, in products stored beyond 10 years, especially when a low number of CD34+ cells is available, the quality of stem cell graft should be verified before infusion using the appropriate potency assays.
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Affiliation(s)
- Daniel Lysak
- Department of Haematology and Oncology, University Hospital Pilsen, Pilsen, Czech Republic
| | - Michaela Brychtová
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University in Prague, Pilsen, Czech Republic
| | - Martin Leba
- New Technologies for the Information Society European Centre of Excellence, Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic
| | - Miroslava Čedíková
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University in Prague, Pilsen, Czech Republic
| | - Daniel Georgiev
- New Technologies for the Information Society European Centre of Excellence, Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic
| | - Pavel Jindra
- Department of Haematology and Oncology, University Hospital Pilsen, Pilsen, Czech Republic
| | - Tomáš Vlas
- Institute of Immunology and Allergology, University Hospital Pilsen, Pilsen, Czech Republic
| | - Monika Holubova
- Department of Haematology and Oncology, University Hospital Pilsen, Pilsen, Czech Republic.,Biomedical Center, Faculty of Medicine in Pilsen, Charles University in Prague, Pilsen, Czech Republic
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The Effects of Cryogenic Storage on Human Dental Pulp Stem Cells. Int J Mol Sci 2021; 22:ijms22094432. [PMID: 33922674 PMCID: PMC8122943 DOI: 10.3390/ijms22094432] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 04/19/2021] [Accepted: 04/21/2021] [Indexed: 12/11/2022] Open
Abstract
Dental pulp stem cells (DPSCs) are a type of easily accessible adult mesenchymal stem cell. Due to their ease of access, DPSCs show great promise in regenerative medicine. However, the tooth extractions from which DPSCs can be obtained are usually performed at a period of life when donors would have no therapeutic need of them. For this reason, it is imperative that successful stem cell storage techniques are employed so that these cells remain viable for future use. Any such techniques must result in high post-thaw stem cell recovery without compromising stemness, proliferation, or multipotency. Uncontrolled-rate freezing is not a technically or financially demanding technique compared to expensive and laborious controlled-rate freezing techniques. This study was aimed at observing the effect of uncontrolled-rate freezing on DPSCs stored for 6 and 12 months. Dimethyl sulfoxide at a concentration of 10% was used as a cryoprotective agent. Various features such as shape, proliferation capacity, phenotype, and multipotency were studied after DPSC thawing. The DPSCs did not compromise their stemness, viability, proliferation, or differentiating capabilities, even after one year of cryopreservation at −80 °C. After thawing, they retained their stemness markers and low-level expression of hematopoietic markers. We observed a size reduction in recovery DPSCs after one year of storage. This observation indicates that DPSCs can be successfully used in potential clinical applications, even after a year of uncontrolled cryopreservation.
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Belisário AR, da Costa Funes AP, Luz JR, de Almeida Costa L, Furtado MDSBS, Martins MC, Cruz NG, Pederzoli PRMP, de Andrade RK, Libânio MRIS, de Lima Prata K. Influence of laboratory procedures on postthawing cell viability and hematopoietic engraftment after autologous peripheral blood stem cell transplantation. Transfusion 2021; 61:1202-1214. [PMID: 33569783 DOI: 10.1111/trf.16289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2020] [Revised: 12/17/2020] [Accepted: 12/23/2020] [Indexed: 12/31/2022]
Abstract
BACKGROUND The kinetics of hematopoietic recovery after autologous stem cell transplantation (ASCT) may be affected by laboratory procedures. The aim of this study was to evaluate the influence of characteristics of the cryopreserved units of peripheral blood stem cells (PBSC) on postthawing cell viability and engraftment outcomes after ASCT. STUDY DESIGN AND METHODS This was a retrospective cohort study including individuals referred for ASCT. Cryopreservation was conducted at a single processing facility between 2014 and 2019, and patients received clinical care at six transplant centers. Covariates and outcome data were retrieved from participants' records. RESULTS The study population comprised 619 patients (345 [55.7%] male). Median age was 53 years. Multiple myeloma was the most common diagnosis (62.7%). Higher preapheresis CD34+ cell count, lower nucleated cell (NC) concentration per cryobag, and composition of the cryoprotectant solution (5% dimethyl sulfoxide [DMSO] and 6% hydroxyethyl starch) were statistically significantly associated with higher postthawing cell viability. The linear regression model for time to neutrophil and platelet engraftment included the infused CD34+ cell dose and the composition of the cryoprotectant solution. Patients who had PBSC cryopreserved using 10% DMSO solution presented six times higher odds (odds ratio [OR] = 6.9; 95% confidence interval [CI]: 2.2-21.1; p = .001) of delayed neutrophil engraftment (>14 days) and two times higher odds (OR = 2.3, 95%CI: 1.4-3.7; p = .001) of prolonged hospitalization (>18 days). DISCUSSION The study showed that mobilization efficacy, NC concentration, and the composition of the cryoprotectant solution significantly affected postthawing cell viability. In addition, the composition of the cryoprotectant solution significantly impacted engraftment outcomes and time of hospitalization after ASCT.
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Affiliation(s)
- André Rolim Belisário
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
| | - Ana Paula da Costa Funes
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
| | - Junio Rocha Luz
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
| | - Luciana de Almeida Costa
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
| | | | | | - Nathália Gomide Cruz
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
| | | | - Roberta Kelly de Andrade
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
| | | | - Karen de Lima Prata
- Centro de Tecidos Biológicos de Minas Gerais, Fundação Hemominas, Lagoa Santa, Minas Gerais, Brazil
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8
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Bhasker B. Uncontrolled freezing of peripheral blood hematopoietic cell at -80°C: Our experience. Transfus Clin Biol 2021; 28:222-223. [PMID: 33453375 DOI: 10.1016/j.tracli.2021.01.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 12/22/2020] [Accepted: 01/05/2021] [Indexed: 10/22/2022]
Affiliation(s)
- B Bhasker
- Sparsh Hospital, Yeshwantpur, Bangalore, India.
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9
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Cryopreservation of peripheral blood mononuclear cells using uncontrolled rate freezing. Cell Tissue Bank 2020; 21:631-641. [PMID: 32809089 DOI: 10.1007/s10561-020-09857-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 08/08/2020] [Indexed: 12/25/2022]
Abstract
Peripheral blood mononuclear cells are widely used as source material for anticancer immunotherapies. The conventional cryopreservation method for peripheral blood mononuclear cells is time-consuming and expansive, which involves controlled rate freezing followed by storage in liquid nitrogen. Instead, the convenient uncontrolled rate freezing cryopreservation method had been reported successfully in peripheral blood hematopoietic stem cells and peripheral blood progenitor cells. Therefore, we hypothesized that uncontrolled rate freezing cooling method maybe also applied to peripheral blood mononuclear cells cryopreservation. In this study, we evaluated the performance of uncontrolled rate freezing and controlled rate freezing cooling methods through cell recovery rate, viability, differentiation potential into cytokine-induced killer cells and the cellular properties of the cultured cytokine-induced killer cells. The results showed similar post-thaw viability and recovery rate in both controlled rate freezing and uncontrolled rate freezing cryopreserved peripheral blood mononuclear cells. Importantly, the uncontrolled rate freezing cryopreserved peripheral blood mononuclear cells exhibited higher growth ratio and earlier cell clustering during ex-vivo cytokine-induced killer cell culture than the controlled rate freezing ones. These two groups of expanded cytokine-induced killer cells also exhibited similar effector cell subset ratio and tumoricidal activity. In general, the performance of cryopreserved peripheral blood mononuclear cells using uncontrolled rate freezing cooling method, with the commercial cryoprotective agent CellBanker 2, was equal or better than the controlled rate freezing method. Our study implied that the combined use of cryoprotective agent CellBanker 2 and uncontrolled rate freezing could be a convenient cryopreservation method for peripheral blood mononuclear cells.
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10
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Underwood J, Rahim M, West C, Britton R, Skipworth E, Graves V, Sexton S, Harris H, Schwering D, Sinn A, Pollok KE, Robertson KA, Goebel WS, Hege KM. How old is too old? In vivo engraftment of human peripheral blood stem cells cryopreserved for up to 18 years - implications for clinical transplantation and stability programs. World J Stem Cells 2020; 12:359-367. [PMID: 32547684 PMCID: PMC7280863 DOI: 10.4252/wjsc.v12.i5.359] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/14/2020] [Accepted: 04/28/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Peripheral blood stem cells (PBSC) are commonly cryopreserved awaiting clinical use for hematopoietic stem cell transplant. Long term cryopreservation is commonly defined as five years or longer, and limited data exists regarding how long PBSC can be cryopreserved and retain the ability to successfully engraft. Clinical programs, stem cell banks, and regulatory and accrediting agencies interested in product stability would benefit from such data. Thus, we assessed recovery and colony forming ability of PBSC following long-term cryopreservation as well as their ability to engraft in NOD/SCID/IL-2Rγnull (NSG) mice.
AIM To investigate the in vivo engraftment potential of long-term cryopreserved PBSC units.
METHODS PBSC units which were collected and frozen using validated clinical protocols were obtained for research use from the Cellular Therapy Laboratory at Indiana University Health. These units were thawed in the Cellular Therapy Laboratory using clinical standards of practice, and the pre-freeze and post-thaw characteristics of the units were compared. Progenitor function was assessed using standard colony-forming assays. CD34-selected cells were transplanted into immunodeficient mice to assess stem cell function.
RESULTS Ten PBSC units with mean of 17 years in cryopreservation (range 13.6-18.3 years) demonstrated a mean total cell recovery of 88% ± 12% (range 68%-110%) and post-thaw viability of 69% ± 17% (range 34%-86%). BFU-E growth was shown in 9 of 10 units and CFU-GM growth in 7 of 10 units post-thaw. Immunodeficient mice were transplanted with CD34-selected cells from four randomly chosen PBSC units. All mice demonstrated long-term engraftment at 12 wk with mean 34% ± 24% human CD45+ cells, and differentiation with presence of human CD19+, CD3+ and CD33+ cells. Harvested bone marrow from all mice demonstrated growth of erythroid and myeloid colonies.
CONCLUSION We demonstrated engraftment of clinically-collected and thawed PBSC following cryopreservation up to 18 years in NSG mice, signifying likely successful clinical transplantation of PBSC following long-term cryopreservation.
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Affiliation(s)
- John Underwood
- Departments of Internal Medicine and Pediatrics, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Mahvish Rahim
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Carijo West
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Rebecca Britton
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Elaine Skipworth
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Vicki Graves
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Steven Sexton
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Hillary Harris
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Dave Schwering
- Cellular Therapy Laboratory, Indiana University Health, Indianapolis, IN 46202, United States
| | - Anthony Sinn
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, In Vivo Therapeutics Core and Angio Biocore Shared Resource Facilities for the Indiana University Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Karen E Pollok
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, United States
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, In Vivo Therapeutics Core and Angio Biocore Shared Resource Facilities for the Indiana University Simon Cancer Center, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Kent A Robertson
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - W Scott Goebel
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Kerry M Hege
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Indiana University School of Medicine, Indianapolis, IN 46202, United States
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Kulkarni U, George B. Access to hematopoietic stem-cell transplantation in India. J Postgrad Med 2020; 65:1-4. [PMID: 30693869 PMCID: PMC6380131 DOI: 10.4103/jpgm.jpgm_391_18] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- U Kulkarni
- Department of Haematology, Christian Medical College, Vellore, Tamil Nadu, India
| | - B George
- Department of Haematology, Christian Medical College, Vellore, Tamil Nadu, India
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12
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Agarwal N, Pandey P, Kaul E, Dhingra N, Kumar P. Mechanical Cryopreservation of Peripheral Blood Stem Cell: Initial Experience from a Tertiary Care Hospital. Indian J Hematol Blood Transfus 2019; 35:563-564. [PMID: 31388275 DOI: 10.1007/s12288-019-01140-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 05/17/2019] [Indexed: 11/29/2022] Open
Affiliation(s)
- Nitin Agarwal
- 1Department of Transfusion Medicine, Histocompatibility and Molecular Biology, Jaypee Hospital, Sector-128, Noida, 201304 India
| | - Prashant Pandey
- 1Department of Transfusion Medicine, Histocompatibility and Molecular Biology, Jaypee Hospital, Sector-128, Noida, 201304 India
| | - Esha Kaul
- 2Department of Hemato-Oncology and BMT, Jaypee Hospital, Sector-128, Noida, 201304 India
| | - Nivedita Dhingra
- 2Department of Hemato-Oncology and BMT, Jaypee Hospital, Sector-128, Noida, 201304 India
| | - Praveen Kumar
- 1Department of Transfusion Medicine, Histocompatibility and Molecular Biology, Jaypee Hospital, Sector-128, Noida, 201304 India
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13
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Hornberger K, Yu G, McKenna D, Hubel A. Cryopreservation of Hematopoietic Stem Cells: Emerging Assays, Cryoprotectant Agents, and Technology to Improve Outcomes. Transfus Med Hemother 2019; 46:188-196. [PMID: 31244587 DOI: 10.1159/000496068] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 12/04/2018] [Indexed: 12/11/2022] Open
Abstract
Hematopoietic stem cell (HSC) therapy is widely used to treat a growing number of hematological and non-hematological diseases. Cryopreservation of HSCs allows for cells to be transported from the site of processing to the site of clinical use, creates a larger window of time in which cells can be administered to patients, and allows sufficient time for quality control and regulatory testing. Currently, HSCs and other cell therapies conform to the same cryopreservation techniques as cells used for research purposes: cells are cryopreserved in dimethyl sulfoxide (DMSO) at a slow cooling rate. As a result, HSC therapy can result in numerous adverse symptoms in patients due to the infusion of DMSO. Efforts are being made to improve the cryopreservation of HSCs for clinical use. This review discusses advances in the cryopreservation of HSCs from 2007 to the present. The preclinical development of new cryoprotectants and new technology to eliminate cryoprotectants after thawing are discussed in detail. Additional cryopreservation considerations are included, such as cooling rate, storage temperature, and cell concentration. Preclinical cell assessment and quality control are discussed, as well as clinical studies from the past decade that focus on new cryopreservation protocols to improve patient outcomes.
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Affiliation(s)
- Kathlyn Hornberger
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota, USA
| | - Guanglin Yu
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA
| | - David McKenna
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Allison Hubel
- Department of Mechanical Engineering, University of Minnesota, Minneapolis, Minnesota, USA
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14
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Kriegsmann K, Wuchter P. Mobilization and Collection of Peripheral Blood Stem Cells in Adults: Focus on Timing and Benchmarking. Methods Mol Biol 2019; 2017:41-58. [PMID: 31197767 DOI: 10.1007/978-1-4939-9574-5_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Peripheral blood stem cells (PBSCs) are preferentially used as a hematopoietic stem cell source for autologous blood stem cell transplantation (ABSCT) upon high-dose chemotherapy (HDT) in a variety of hemato-oncologic diseases. As a prerequisite, hematopoietic stem cells have to be mobilized into the peripheral blood (PB) and collected by leukapheresis (LP). Despite continuous improvements, e.g., the introduction of plerixafor, current challenges are the further optimization regarding the leukapheresis procedure, preventing collection failures, as well as benchmarking and harmonization of mobilization approaches between institutions.This chapter summarizes the current PBSC mobilization and collection approaches and is focusing on timely orchestration of mobilization therapy, granulocyte colony-stimulating factor (G-CSF) application, and peripheral blood (PB) CD34+ cell assessment. Moreover, strategies for prediction and performance assessment of the PBSC collection yield are discussed.
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Affiliation(s)
- Katharina Kriegsmann
- Department of Medicine V (Hematology, Oncology, Rheumatology), Heidelberg University, Heidelberg, Germany
| | - Patrick Wuchter
- Institute of Transfusion Medicine and Immunology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany. .,German Red Cross Blood Service Baden-Württemberg - Hessen, Mannheim, Germany.
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15
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Vakhshori V, Bougioukli S, Sugiyama O, Tang A, Yoho R, Lieberman JR. Cryopreservation of Human Adipose-Derived Stem Cells for Use in Ex Vivo Regional Gene Therapy for Bone Repair. Hum Gene Ther Methods 2018; 29:269-277. [PMID: 30280937 DOI: 10.1089/hgtb.2018.191] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The development of an ex vivo regional gene therapy clinical pathway using adipose-derived stem cells (ASCs) may require cryopreservation for cell culture, storage, and transport prior to clinical use. ASCs isolated from five donors were transduced with a lentiviral vector containing BMP-2. Three groups were assessed: transduction without cell freezing (group 1), freezing of cells for 3 weeks followed by transduction (group 2), and cell transduction prior to freezing (group 3). Nontransduced cells were used as a control. The cluster of differentiation (CD) marker profiles, cell number, BMP-2 production, and osteogenic potential were measured. The CD marker profile (CD44, CD73, CD90, and CD105) was unchanged after cryopreservation. Cell number was equivalent among cryopreservation protocols in transduced and nontransduced cells. There was a trend toward decreased BMP-2 production in group 3 compared to groups 1 and 2. Osteogenic potential based on Alizarin red concentration was higher in group 2 compared to group 3, with no difference compared to group 1. Freezing ASCs prior to transduction with a lentiviral vector containing BMP-2 has no detrimental effect on cell number, BMP-2 production, osteogenic potential, or immunophenotype. Transduction prior to freezing, however, may limit the BMP-2 production and potential osteogenic differentiation of the ASCs.
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Affiliation(s)
- Venus Vakhshori
- Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California; Visalia, California
| | - Sofia Bougioukli
- Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California; Visalia, California
| | - Osamu Sugiyama
- Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California; Visalia, California
| | - Amy Tang
- Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California; Visalia, California
| | - Robert Yoho
- Cosmetic surgery private practice, Visalia, California
| | - Jay R Lieberman
- Department of Orthopedic Surgery, Keck School of Medicine, University of Southern California, Los Angeles, California; Visalia, California
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16
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Holbro A, Baldomero H, Lanza F, Chabannon C, Snowden JA, Buser A, Infanti L, Worel N, Sureda A, Badoglio M, Passweg J, Bonini C. Handling, processing and disposal of stem cell products in Europe: A survey by the cellular therapy and immunobiology working party of the European Society for Blood and Marrow Transplantation. Cytotherapy 2018; 20:453-460. [DOI: 10.1016/j.jcyt.2017.12.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 11/03/2017] [Accepted: 12/04/2017] [Indexed: 10/18/2022]
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17
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Lisenko K, Pavel P, Kriegsmann M, Bruckner T, Hillengass J, Goldschmidt H, Witzens-Harig M, Ho AD, Wuchter P. Storage Duration of Autologous Stem Cell Preparations Has No Impact on Hematopoietic Recovery after Transplantation. Biol Blood Marrow Transplant 2016; 23:684-690. [PMID: 28013016 DOI: 10.1016/j.bbmt.2016.12.631] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 12/19/2016] [Indexed: 12/16/2022]
Abstract
Peripheral blood stem cells (PBSCs) are widely used for autologous blood stem cell transplantation (ABSCT). These cells must be stored for months or even years, usually at temperatures ≤-140°C, until their use. Although several in vitro studies on CD34+ viability and clonogenic assays of PBSCs after long-term storage have been reported, only a few publications have investigated the influence of long-term storage on in vivo hematopoietic reconstitution. In this study, we retrospectively analyzed hematopoietic recovery after storage of PBSCs via controlled-rate freezing (CRF) and cryostorage in 10% DMSO at ≤-140°C in 105 patients with multiple myeloma who received high-dose melphalan before ABSCT. Three groups of PBSC transplantation (n = 247) were delineated based on the storage period: short-term (≤12 months, n = 143), medium-term (>12 and ≤60 months, n = 75), and long-term storage (>60 months, n = 29). A neutrophil increase of ≥.5 × 109/L in medium-term or long-term PBSC cryopreservation groups was observed at day 14 after ABSCT; this increase was comparable to patients who received briefly stored PBSCs (day 15). No negative effect of PBSC storage duration was observed on leucocyte or neutrophil reconstitution. Platelet reconstitutions of ≥20 × 109/L and 50 × 109/L were observed after median times of 10 to 11 and 13 to 14 days after ABSCT, respectively. No influence of PBSC storage duration on platelet recovery of ≥20 × 109/L and ≥50 × 109/L was observed in the 3 storage groups (P = .07, P = .32). The number of previous ABSCTs also had no significant impact upon hematopoietic reconstitution. In conclusion, these results indicate that long-term cryopreservation of PBSC products at vapor nitrogen temperature after CRF does not have a negative effect on hematopoietic recovery even after prolonged storage.
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Affiliation(s)
- Katharina Lisenko
- Department of Medicine V, Heidelberg University, Heidelberg, Germany
| | - Petra Pavel
- Stem Cell Laboratory, IKTZ Heidelberg GmbH, Heidelberg, Germany
| | - Mark Kriegsmann
- Institute of Pathology, University Hospital Heidelberg, Heidelberg, Germany
| | - Thomas Bruckner
- Institute of Medical Biometry und Informatics, Heidelberg University, Heidelberg, Germany
| | - Jens Hillengass
- Department of Medicine V, Heidelberg University, Heidelberg, Germany
| | | | | | - Anthony D Ho
- Department of Medicine V, Heidelberg University, Heidelberg, Germany
| | - Patrick Wuchter
- Department of Medicine V, Heidelberg University, Heidelberg, Germany; Institute of Transfusion Medicine and Immunology, German Red Cross Blood Service Baden-Württemberg-Hessen, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
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18
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Watts MJ, Linch DC. Optimisation and quality control of cell processing for autologous stem cell transplantation. Br J Haematol 2016; 175:771-783. [DOI: 10.1111/bjh.14378] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Michael J. Watts
- University College London Hospitals; London UK
- University College London; London UK
| | - David C. Linch
- University College London Hospitals; London UK
- University College London; London UK
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19
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Yuan Y, Yang Y, Tian Y, Park J, Dai A, Roberts RM, Liu Y, Han X. Efficient long-term cryopreservation of pluripotent stem cells at -80 °C. Sci Rep 2016; 6:34476. [PMID: 27694817 PMCID: PMC5046093 DOI: 10.1038/srep34476] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Accepted: 09/09/2016] [Indexed: 02/06/2023] Open
Abstract
Current long term cryopreservation of cell stocks routinely requires the use of liquid nitrogen (LN2), because commonly used cryopreservation media containing cell membrane permeating cryoprotectants are thermally unstable when frozen at higher storage temperatures, e.g. -80 °C. This instability leads to ice recrystallization, causing progressive loss of cell viability over time under the storage conditions provided by most laboratory deep freezers. The dependency on LN2 for cell storage significantly increases operational expense and raises issues related to impaired working efficiency and safety. Here we demonstrate that addition of Ficoll 70 to cryoprotectant solutions significantly improves system thermal stability at the working temperature (~-80 °C) of laboratory deep freezers. Moreover, a medium comprised of Ficoll 70 and dimethyl sulfoxide (DMSO) in presence or absence of fetal bovine serum (FBS) can provide reliable cryopreservation of various kinds of human and porcine pluripotent stem cells at -80 °C for periods that extend up to at least one year, with the post-thaw viability, plating efficiency, and full retention of pluripotent phenotype comparable to that achieved with LN2 storage. These results illustrate the practicability of a promising long-term cryopreservation method that completely eliminates the need for LN2.
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Affiliation(s)
- Ye Yuan
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Ying Yang
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Yuchen Tian
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Jinkyu Park
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Aihua Dai
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - R Michael Roberts
- Division of Animal Sciences and Bond Life Sciences Center; University of Missouri, Columbia, MO 65211, USA
| | - Yang Liu
- Department of Mechanical &Aerospace Engineering; University of Missouri, Columbia, MO 65211, USA
| | - Xu Han
- Department of Mechanical &Aerospace Engineering; University of Missouri, Columbia, MO 65211, USA.,Comparative Medicine Center, University of Missouri, Columbia, MO 65211, USA
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20
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Lecchi L, Giovanelli S, Gagliardi B, Pezzali I, Ratti I, Marconi M. An update on methods for cryopreservation and thawing of hemopoietic stem cells. Transfus Apher Sci 2016; 54:324-36. [DOI: 10.1016/j.transci.2016.05.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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21
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Preserved in vivo reconstitution ability of PBSCs cryopreserved for a decade at −80 °C. Bone Marrow Transplant 2015; 50:1195-200. [DOI: 10.1038/bmt.2015.147] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 05/14/2015] [Accepted: 05/19/2015] [Indexed: 12/14/2022]
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22
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Watz E, Remberger M, Ringden O, Ljungman P, Sundin M, Mattsson J, Uhlin M. Quality of the hematopoietic stem cell graft affects the clinical outcome of allogeneic stem cell transplantation. Transfusion 2015; 55:2339-50. [PMID: 25968813 DOI: 10.1111/trf.13143] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Revised: 03/17/2015] [Accepted: 03/26/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND In approximately two-thirds of patients undergoing allogeneic hematopoietic stem cell transplantation (HSCT) no suitable related donor can be identified but an unrelated HLA-matched donor can be found through international donor registries. HSCT grafts from unrelated donors are commonly collected at distant sites. Therefore, graft storage and transportation becomes crucial in the HSCT process. We aimed to study the impact of graft quality on clinical outcome and identify factors affecting graft quality. STUDY DESIGN AND METHODS We investigated the influence of graft quality on the clinical outcome in 144 HSCT patients. Graft quality was assessed by determining the viability (7-aminoactinomycin D [7AAD]) on a frozen-thawed sample from the peripheral blood stem cell (PBSC) graft. RESULTS Patients receiving PBSCs with inferior quality (i.e., viability < 64% in the frozen-thawed sample) more frequently developed acute graft-versus-host disease (aGVHD) Grades I to IV than patients receiving grafts with better quality (p = 0.025). The transplant-related mortality (TRM) was higher in the group receiving grafts with lower viability (p = 0.03). The viability of the frozen-thawed samples was highly variable (median, 64%; range, 24%-96%). No correlation could be observed when comparing the viability in newly arrived PBSC grafts to frozen-thawed vials. Grafts with white blood cell (WBC) count of more than 300 × 10(9) /L had lower viability than those with lower WBC counts (p < 0.001). CONCLUSION Graft quality affects clinical outcome. Patients receiving grafts with inferior quality had more aGVHD and higher TRM. There is a need for better analyses for assessing graft quality in routine HSCT care; analysis using 7AAD on fresh PBSC grafts is not sufficient.
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Affiliation(s)
- Emma Watz
- Department of Oncology and Pathology.,Department of Clinical Immunology and Transfusion Medicine
| | - Mats Remberger
- Department of Oncology and Pathology.,Centre for Allogeneic Stem Cell Transplantation
| | - Olle Ringden
- Department of Oncology and Pathology.,Centre for Allogeneic Stem Cell Transplantation
| | - Per Ljungman
- Department of Hematology.,Division of Hematology, Department of Medicine, Huddinge
| | - Mikael Sundin
- Hematology/Immunology/SCT Section, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden.,Division of Pediatrics, Department of Clinical, Science, Intervention and Technology, Karolinska Institutet
| | - Jonas Mattsson
- Department of Oncology and Pathology.,Centre for Allogeneic Stem Cell Transplantation
| | - Michael Uhlin
- Department of Oncology and Pathology.,Centre for Allogeneic Stem Cell Transplantation.,Department of Clinical Immunology and Transfusion Medicine
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23
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Kumar A, Bhattacharyya S, Rattan V. Effect of uncontrolled freezing on biological characteristics of human dental pulp stem cells. Cell Tissue Bank 2015; 16:513-22. [PMID: 25663639 DOI: 10.1007/s10561-015-9498-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Accepted: 01/28/2015] [Indexed: 01/09/2023]
Abstract
Human dental pulp stem cells (hDPSCs) hold great promise as a source of adult stem cells for utilization in regenerative medicine. Successful storage and post thaw recovery of DPSCs without loss of function is a key issue for future clinical application. Most of the cryopreservation methods use controlled rate freezing and vapor phase nitrogen to store stem cells. But these methods are both expensive and laborious. In this study, we isolated DPSCs from a patient undergoing impacted mandibular third molar extraction. We adopted eight different methods of cryopreservation at -80 °C for long term storage of the DPSC aliquots. Various parameters like proliferation, cell death, cell cycle, retention of stemness markers and differentiation potential were studied post cryopreservation period of 1 year. We observed successful recovery of stem cells in every method and a significant difference in proliferation potential and cell death between samples stored by different methods. However, post thaw, all cells retained their stemness markers. All DPSCs stored by different methods were able to differentiate into osteoblast like cells, adipocytes and neural cells. Based on these parameters we concluded that uncontrolled freezing at a temperature of -80 °C is as effective as controlled freezing using ethanol vessels and other cryopreservation methods. To the best of our knowledge, our study provides the first proof of concept that long term storage in uncontrolled freezing of cells at -80 °C in 10 % DMSO does not affect the revival capacity of hDPSCs. This implies that DPSCs may be used successfully for tissue engineering and cell based therapeutics even after long term, uncontrolled cryopreservation.
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Affiliation(s)
- Ajay Kumar
- Department of Biophysics, PGIMER, Chandigarh, 160012, India
| | | | - Vidya Rattan
- Unit of Oral and Maxillofacial Surgery, Oral Health Science Centre, PGIMER, Chandigarh, India
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