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International Journal of Medical Laboratory
Shahid Sadoughi University of Medical Sciences
Tue, Dec 31, 2024
[Archive]
Volume 10, Issue 1 (February 2023)
IJML 2023, 10(1): 46-56 |
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Shokouhian M, Mozdarani H, Soleimani M, Safa M, Rezvany M R. Evaluation of DNA Damage and Repair In In Vitro Expanded Cord Blood CD 34 Positive Hematopoietic Stem Cell. IJML 2023; 10 (1) :46-56
URL: http://ijml.ssu.ac.ir/article-1-466-en.html
URL: http://ijml.ssu.ac.ir/article-1-466-en.html
Department of Hematology and Blood Transfusion, School of Allied Medical Sciences, Iran University of Medical Sciences, Tehran, Iran
Abstract: (454 Views)
Background and Aims: The occurrence of single and double-strand breaks of DNA damage is the major obstacle for proliferation under various environmental factors and, if not repaired, can result in many consequences, including mutation, cell death, and others. So, the present study was conducted to evaluate the damage of DNA and the expression status of DNA repair system genes before and after stem cell proliferation.
Materials and Methods: The MACS method isolated the umbilical cord blood hematopoietic stem cells (UCB-HSCs). In order to investigate cell death, the study of Annexin V/PI was done by flow cytometry. Comet assay made observation and identification of DNA breaks, and the expression of genes normally involved in the repair of DNA breaks was evaluated by real-time polymerase chain reaction.
Results: The average number of stem cells increased by 1.9-fold after three days of proliferation. The apoptotic percentage of cells was negligible (less than 0.2%), and the purity of the CD34+ cells was reduced by about one-third in three days (67%). By examining the expression of DNA repair genes, including KU70, KU80, RAD51, and XRCC1, their increased fold change was not significant. In a microscopic examination of stem cells in the comet assay, there was no significant difference between DNA damage before (1.33% ± 0.31) and after (2.08% ± 0.92) replication.
Conclusion: In our investigation, neither DNA damage nor changes in the DNA break repair were observed. However, further studies are required to clarify the DNA break repair by recruiting more UCB-HSCs samples.
Materials and Methods: The MACS method isolated the umbilical cord blood hematopoietic stem cells (UCB-HSCs). In order to investigate cell death, the study of Annexin V/PI was done by flow cytometry. Comet assay made observation and identification of DNA breaks, and the expression of genes normally involved in the repair of DNA breaks was evaluated by real-time polymerase chain reaction.
Results: The average number of stem cells increased by 1.9-fold after three days of proliferation. The apoptotic percentage of cells was negligible (less than 0.2%), and the purity of the CD34+ cells was reduced by about one-third in three days (67%). By examining the expression of DNA repair genes, including KU70, KU80, RAD51, and XRCC1, their increased fold change was not significant. In a microscopic examination of stem cells in the comet assay, there was no significant difference between DNA damage before (1.33% ± 0.31) and after (2.08% ± 0.92) replication.
Conclusion: In our investigation, neither DNA damage nor changes in the DNA break repair were observed. However, further studies are required to clarify the DNA break repair by recruiting more UCB-HSCs samples.
Type of Study: Research |
Subject:
Hematology & Blood Banking
Received: 2022/12/5 | Accepted: 2023/02/4 | Published: 2023/03/1
Received: 2022/12/5 | Accepted: 2023/02/4 | Published: 2023/03/1
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