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Sinha S, Dhankani P, Nahiyera M, Singh KB, Singh D, Mugale MN, Sharma S, Kumaravelu J, Dikshit M, Kumar S. iNOS regulates hematopoietic stem and progenitor cells via mitochondrial signaling and is critical for bone marrow regeneration. Free Radic Biol Med 2024; 219:184-194. [PMID: 38636716 DOI: 10.1016/j.freeradbiomed.2024.04.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 03/24/2024] [Accepted: 04/13/2024] [Indexed: 04/20/2024]
Abstract
Hematopoietic stem cells (HSCs) replenish blood cells under steady state and on demand, that exhibit therapeutic potential for Bone marrow failures and leukemia. Redox signaling plays key role in immune cells and hematopoiesis. However, the role of reactive nitrogen species in hematopoiesis remains unclear and requires further investigation. We investigated the significance of inducible nitric oxide synthase/nitric oxide (iNOS/NO) signaling in hematopoietic stem and progenitor cells (HSPCs) and hematopoiesis under steady-state and stress conditions. HSCs contain low levels of NO and iNOS under normal conditions, but these increase upon bone marrow stress. iNOS-deficient mice showed subtle changes in peripheral blood cells but significant alterations in HSPCs, including increased HSCs and multipotent progenitors. Surprisingly, iNOS-deficient mice displayed heightened susceptibility and delayed recovery of blood progeny following 5-Fluorouracil (5-FU) induced hematopoietic stress. Loss of quiescence and increased mitochondrial stress, indicated by elevated MitoSOX and MMPhi HSCs, were observed in iNOS-deficient mice. Furthermore, pharmacological approaches to mitigate mitochondrial stress rescued 5-FU-induced HSC death. Conversely, iNOS-NO signaling was required for demand-driven mitochondrial activity and proliferation during hematopoietic recovery, as iNOS-deficient mice and NO signaling inhibitors exhibit reduced mitochondrial activity. In conclusion, our study challenges the conventional view of iNOS-derived NO as a cytotoxic molecule and highlights its intriguing role in HSPCs. Together, our findings provide insights into the crucial role of the iNOS-NO-mitochondrial axis in regulating HSPCs and hematopoiesis.
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Affiliation(s)
- Supriya Sinha
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Priyanka Dhankani
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Milind Nahiyera
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Krishna Bhan Singh
- Endocrinology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Divya Singh
- Endocrinology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Madhav Nilakanth Mugale
- Toxicology and Experimental Medicine Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Sharad Sharma
- Toxicology and Experimental Medicine Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Jagavelu Kumaravelu
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India
| | - Madhu Dikshit
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India
| | - Sachin Kumar
- Pharmacology Division, CSIR-Central Drug Research Institute, Lucknow, 226031, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad - 201002, India.
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Yamashita T. [Fanconi anemia]. Rinsho Ketsueki 2019; 60:403-407. [PMID: 31168005 DOI: 10.11406/rinketsu.60.403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Fanconi anemia (FA) is a genetic disorder characterized by progressive bone marrow failure, increased susceptibility to leukemia and cancer, and genomic instabilities. Protein products encoded by 22 FA genes, identified till date, cooperate in a molecular pathway called the FA pathway to repair DNA interstrand cross-links induced by chemotherapeutic agents, such as mitomycin C and cisplatin. An accumulating number of studies have shown several new functional aspects of the FA pathway, particularly in the context of the pathogenesis of bone marrow failure. This review focuses on the following topics: (1) aldehydes as intrinsic interstrand cross-linkers; (2) cytokine-induced hematopoietic stress; (3) increased transforming growth factor-β signaling; (4) mitochondrial functions of FA proteins. These findings are expected to offer new therapeutic opportunities for bone marrow failure in FA.
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Affiliation(s)
- Takayuki Yamashita
- Laboratory of Molecular Genetics, Institute for Molecular and Cellular Regulation, Gunma University
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