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Liu L, Wang Z, Wang M, Zhao G. Quantitative Analysis of Ice Crystal Growth During Freezing of Dimethyl Sulfoxide Solutions Under Alternating Current Electric Fields. Biopreserv Biobank 2023. [PMID: 38011517 DOI: 10.1089/bio.2023.0035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023] Open
Abstract
During cryopreservation, the growth of ice crystals can cause mechanical damage to samples, which is one of the important factors limiting the quality of preserved samples. To enhance the preservation quality of biological samples, scholars have tried various engineering methods. Among them, an electric field is an essential factor affecting solution freezing. Dimethyl sulfoxide, as a commonly used cryoprotectant, can cause mechanical damage to cells due to ice crystals even when freezing at the optimal freezing rate. Water is a strongly polar dielectric material, and the applied alternating current (AC) electric field will affect the water freezing performance. Therefore, a quantitative study of ice crystal nucleation and growth during freezing of dimethyl sulfoxide solutions under different AC electric field conditions is needed to try to reduce ice crystal damage. We created a liquid-film device to approximate the ice crystal growth process as a two-dimensional image. The frequency of the AC voltage was set from 0 to 50 kHz. We measured the supercooling of the dimethyl sulfoxide solution under AC electric field conditions. As an objective and accurate quantitative analysis of the ice crystal growth process, we propose a Dilated Convolutional Segmentation Transformer for semantic segmentation of ice crystal images. It is concluded that the average area and the growth rate of single ice crystals decrease with increasing electric field frequency at a certain concentration of dimethyl sulfoxide solution. Lower concentrations of dimethyl sulfoxide solution in combination with an AC electric field can achieve similar ice suppression effects as when higher concentrations of dimethyl sulfoxide solution act alone. We believe that AC electric fields are expected to be an aid to cryopreservation and provide some theoretical basis and experimental foundation for its development.
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Affiliation(s)
- Liting Liu
- Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China
| | - Zirui Wang
- Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China
| | - Menghan Wang
- Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China
| | - Gang Zhao
- Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, China
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Conde MCM, Chisini LA, Grazioli G, Francia A, Carvalho RVD, Alcázar JCB, Tarquinio SBC, Demarco FF. Does Cryopreservation Affect the Biological Properties of Stem Cells from Dental Tissues? A Systematic Review. Braz Dent J 2017; 27:633-640. [PMID: 27982171 DOI: 10.1590/0103-6440201600980] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Accepted: 08/12/2016] [Indexed: 01/09/2023] Open
Abstract
This systematic review evaluated if different cryopreservation protocols could affect biological properties (Cell survival rate (CSR), proliferation, differentiation, maintenance of stem cell markers) of stem cells obtained from dental tissues (DSC) post-thaw. An electronic search was carried out within PubMed and ISI Web Science by using specific keyword. Two independent reviewers read the titles and abstracts of all reports respecting predetermined inclusion/exclusion criteria. Data were extracted considering the biological properties of previously cryopreserved DSCs and previously cryopreserved dental tissues. DSCs cryopreserved as soon as possible after their isolation presents a CSR quite similar to the non-cryopreserved DSC. Dimethyl sulfoxide (DMSO) [10%] showed good results related to cell recovery post-thaw to cryopreserve cells and tissues for periods of up to 2 years. The cryopreservation of DSC in a mechanical freezer (-80°C) allows the recovery of stem cells post-thaw. The facilities producing magnetic field (MF), demand a lower concentration of cryoprotectant, but their use is not dispensable. It is possible to isolate and cryopreserve dental pulp stem cell (DPSC) from healthy and diseased vital teeth. Cryopreservation of dental tissues for late DSC isolation, combined with MF dispensability, could be valuable to reduce costs and improve the logistics to develop teeth banks.
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Affiliation(s)
| | - Luiz Alexandre Chisini
- Post-Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil
| | - Guillermo Grazioli
- Post-Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil
| | - Alejandro Francia
- School of Dentistry, University of the Republic, Montevideo, Uruguay
| | | | - Jose Carlos Bernedo Alcázar
- Post-Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil.,Post-Graduate Program in Science and Material Engineering, Federal University of Pelotas, Pelotas, Brazil
| | - Sandra Beatriz Chavez Tarquinio
- Post-Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil.,Department of Semiology and Clinics, Federal University of Pelotas, Pelotas, Brazil
| | - Flávio Fernando Demarco
- Post-Graduate Program in Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil.,Post-Graduate Program in Epidemiology, Federal University of Pelotas, Pelotas, Brazil
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da Silva Meirelles L, Malta TM, de Deus Wagatsuma VM, Palma PVB, Araújo AG, Ribeiro Malmegrim KC, Morato de Oliveira F, Panepucci RA, Silva WA, Kashima Haddad S, Covas DT. Cultured Human Adipose Tissue Pericytes and Mesenchymal Stromal Cells Display a Very Similar Gene Expression Profile. Stem Cells Dev 2015; 24:2822-40. [PMID: 26192741 DOI: 10.1089/scd.2015.0153] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Mesenchymal stromal cells (MSCs) are cultured cells that can give rise to mature mesenchymal cells under appropriate conditions and secrete a number of biologically relevant molecules that may play an important role in regenerative medicine. Evidence indicates that pericytes (PCs) correspond to mesenchymal stem cells in vivo and can give rise to MSCs when cultured, but a comparison between the gene expression profiles of cultured PCs (cPCs) and MSCs is lacking. We have devised a novel methodology to isolate PCs from human adipose tissue and compared cPCs to MSCs obtained through traditional methods. Freshly isolated PCs expressed CD34, CD140b, and CD271 on their surface, but not CD146. Both MSCs and cPCs were able to differentiate along mesenchymal pathways in vitro, displayed an essentially identical surface immunophenotype, and exhibited the ability to suppress CD3(+) lymphocyte proliferation in vitro. Microarray expression data of cPCs and MSCs formed a single cluster among other cell types. Further analyses showed that the gene expression profiles of cPCs and MSCs are extremely similar, although MSCs differentially expressed endothelial cell (EC)-specific transcripts. These results confirm, using the power of transcriptomic analysis, that PCs give rise to MSCs and suggest that low levels of ECs may persist in MSC cultures established using traditional protocols.
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Affiliation(s)
- Lindolfo da Silva Meirelles
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil .,2 Laboratory for Stem Cells and Tissue Engineering, PPGBioSaúde, Lutheran University of Brazil , Canoas, Brazil
| | - Tathiane Maistro Malta
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Virgínia Mara de Deus Wagatsuma
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Patrícia Viana Bonini Palma
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Amélia Goes Araújo
- 3 Laboratory of Large-Scale Functional Biology (LLSFBio), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | | | - Fábio Morato de Oliveira
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Rodrigo Alexandre Panepucci
- 3 Laboratory of Large-Scale Functional Biology (LLSFBio), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Wilson Araújo Silva
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil .,5 Department of Genetics, School of Medicine of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Simone Kashima Haddad
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
| | - Dimas Tadeu Covas
- 1 Center for Cell-Based Therapy (CEPID/FAPESP), Regional Center for Hemotherapy of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil .,6 Department of Clinical Medicine, School of Medicine of Ribeirão Preto, University of São Paulo , Ribeirão Preto, Brazil
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