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Capitano ML, Mohamad SF, Cooper S, Guo B, Huang X, Gunawan AM, Sampson C, Ropa J, Srour EF, Orschell CM, Broxmeyer HE. Mitigating oxygen stress enhances aged mouse hematopoietic stem cell numbers and function. J Clin Invest 2021; 131:140177. [PMID: 33393491 DOI: 10.1172/jci140177] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 09/24/2020] [Indexed: 12/20/2022] Open
Abstract
Bone marrow (BM) hematopoietic stem cells (HSCs) become dysfunctional during aging (i.e., they are increased in number but have an overall reduction in long-term repopulation potential and increased myeloid differentiation) compared with young HSCs, suggesting limited use of old donor BM cells for hematopoietic cell transplantation (HCT). BM cells reside in an in vivo hypoxic environment yet are evaluated after collection and processing in ambient air. We detected an increase in the number of both young and aged mouse BM HSCs collected and processed in 3% O2 compared with the number of young BM HSCs collected and processed in ambient air (~21% O2). Aged BM collected and processed under hypoxic conditions demonstrated enhanced engraftment capability during competitive transplantation analysis and contained more functional HSCs as determined by limiting dilution analysis. Importantly, the myeloid-to-lymphoid differentiation ratio of aged BM collected in 3% O2 was similar to that detected in young BM collected in ambient air or hypoxic conditions, consistent with the increased number of common lymphoid progenitors following collection under hypoxia. Enhanced functional activity and differentiation of old BM collected and processed in hypoxia correlated with reduced "stress" associated with ambient air BM collection and suggests that aged BM may be better and more efficiently used for HCT if collected and processed under hypoxia so that it is never exposed to ambient air O2.
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Affiliation(s)
- Maegan L Capitano
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Safa F Mohamad
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Scott Cooper
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Bin Guo
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Xinxin Huang
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Zhongshan-Xuhui Hospital and Shanghai Key Laboratory of Medical Epigenetics, Institutes of Biomedical Sciences, Fudan University, Shanghai, China
| | - Andrea M Gunawan
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Carol Sampson
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - James Ropa
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Edward F Srour
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA.,Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Christie M Orschell
- Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Hal E Broxmeyer
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, USA
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