Radiation-induced bystander effects impair transplanted human hematopoietic stem cells via oxidative DNA damage.
Blood
; 137(24): 3339-3350, 2021 06 17.
Article
in En
| MEDLINE
| ID: mdl-33881475
ABSTRACT
Total body irradiation (TBI) is commonly used in host conditioning regimens for human hematopoietic stem cell (HSC) transplantation to treat various hematological disorders. Exposure to TBI not only induces acute myelosuppression and immunosuppression, but also injures the various components of the HSC niche in recipients. Our previous study demonstrated that radiation-induced bystander effects (RIBE) of irradiated recipients decreased the long-term repopulating ability of transplanted mouse HSCs. However, RIBE on transplanted human HSCs have not been studied. Here, we report that RIBE impaired the long-term hematopoietic reconstitution of human HSCs as well as the colony-forming ability of human hematopoietic progenitor cells (HPCs). Our further analyses revealed that the RIBE-affected human hematopoietic cells showed enhanced DNA damage responses, cell-cycle arrest, and p53-dependent apoptosis, mainly because of oxidative stress. Moreover, multiple antioxidants could mitigate these bystander effects, though at different efficacies in vitro and in vivo. Taken together, these findings suggest that RIBE impair human HSCs and HPCs by oxidative DNA damage. This study provides definitive evidence for RIBE on transplanted human HSCs and further justifies the necessity of conducting clinical trials to evaluate different antioxidants to improve the efficacy of HSC transplantation for the patients with hematological or nonhematological disorders.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Radiation Injuries, Experimental
/
DNA Damage
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Hematopoietic Stem Cells
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Oxidative Stress
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Hematopoietic Stem Cell Transplantation
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Bystander Effect
/
Gamma Rays
Limits:
Animals
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Female
/
Humans
Language:
En
Journal:
Blood
Year:
2021
Type:
Article