Abstract
Indole-3-carboxaldehyde (I3A), one of tryptophan metabolites derived from gut microbiota, extends the lifespan of mice after high-dose ionizing radiation exposure. Persistent myelosuppression is the most common and fatal complication for victims of nuclear accidents and patients undergoing radiotherapy, with few therapeutic options available. However, whether and how I3A protects ionizing radiation-induced hematopoietic toxicity remain unknown. In this study, we demonstrated that I3A treatment effectively ameliorated radiation-induced hematopoietic injury through accelerating peripheral blood cells recovery, promoting bone marrow cellularity restoration and enhancing functional HSPC regeneration. Additionally, I3A also suppressed intracellular reactive oxygen species production and inhibited apoptosis in irradiated HSPCs. Mechanistically, I3A treatment significantly increased HSPC quiescence, thus conferring HSPCs with resistance against radiation injury. Finally, I3A treatment could improve survival of lethally irradiated mice. Taken together, our data suggest that I3A acts as a gut microbiota-derived paracrine factor that regulates HSPC regeneration and may serve as a promising therapeutic agent for ionizing radiation-induced myelosuppression.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- I3A:
-
Indole-3-carboxaldehyde
- HSPCs:
-
Hematopoietic stem and progenitor cells
- HSCs:
-
Hematopoietic stem cells
- IR:
-
Ionizing radiation
- MPP:
-
Multipotent progenitor
- AhR:
-
Aryl hydrocarbon receptor
- DMSO:
-
Dimethyl sulfoxide
- BM:
-
Bone marrow
- PB:
-
Peripheral blood
- LSK:
-
Lin−Sca1+cKit+
- ROS:
-
Reactive oxygen species
- qRT-PCR:
-
Quantitative real-time polymerase chain reaction
- ANOVA:
-
One-way analysis of variance
- SD:
-
Standard deviation
- MP:
-
Myeloid progenitor
- LT-HSCs:
-
Long-term HSCs
- ST-HSCs:
-
Short-term HSCs
- WBC:
-
White blood cells
- Lym:
-
Lymphocytes
- Neu:
-
Neutrophils
- RBC:
-
Red blood cells
- HGB:
-
Hemoglobin
- PLT:
-
Platelets
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Acknowledgements
We would like to thank Yu Hou (Department of Hematology, Southwest Hospital, Army Military Medical University, Chongqing, China) for the gift of congenic CD45.1 mice.
Funding
This work was supported by Natural Science Foundation of China (No. 81170471, No. 31371393), the Intramural Research Project Grants (No. AWS17J007), Fundamental Research Funds for the Central Universities (No. 2021CDJYGRH-003), and China Postdoctoral Science Foundation (No. 2021M700598).
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DG, YY and ZY conceived and designed the project. DG, YY, MP, XL, YL and PH performed the experiments and analyzed the data. HS and HW assisted with animal experiments. DG and YY drafted the manuscript. ZY provided funding support and revised the manuscript. All authors have read and approved the final manuscript.
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This study was approved by the institutional animal care and use committee of Chongqing University (Approval No. CQU-IACUC-RE-202211-003).
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Guan, D., Yang, Y., Pang, M. et al. Indole-3-carboxaldehyde ameliorates ionizing radiation-induced hematopoietic injury by enhancing hematopoietic stem and progenitor cell quiescence. Mol Cell Biochem 479, 313–323 (2024). https://doi.org/10.1007/s11010-023-04732-0
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DOI: https://doi.org/10.1007/s11010-023-04732-0