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Zhang H, Li HS, Hillmer EJ, Zhao Y, Chrisikos TT, Hu H, Wu X, Thompson EJ, Clise-Dwyer K, Millerchip KA, Wei Y, Puebla-Osorio N, Kaushik S, Santos MA, Wang B, Garcia-Manero G, Wang J, Sun SC, Watowich SS. Genetic rescue of lineage-balanced blood cell production reveals a crucial role for STAT3 antiinflammatory activity in hematopoiesis. Proc Natl Acad Sci U S A 2018; 115:E2311-E2319. [PMID: 29463696 PMCID: PMC5878002 DOI: 10.1073/pnas.1713889115] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Blood cell formation must be appropriately maintained throughout life to provide robust immune function, hemostasis, and oxygen delivery to tissues, and to prevent disorders that result from over- or underproduction of critical lineages. Persistent inflammation deregulates hematopoiesis by damaging hematopoietic stem and progenitor cells (HSPCs), leading to elevated myeloid cell output and eventual bone marrow failure. Nonetheless, antiinflammatory mechanisms that protect the hematopoietic system are understudied. The transcriptional regulator STAT3 has myriad roles in HSPC-derived populations and nonhematopoietic tissues, including a potent antiinflammatory function in differentiated myeloid cells. STAT3 antiinflammatory activity is facilitated by STAT3-mediated transcriptional repression of Ube2n, which encodes the E2 ubiquitin-conjugating enzyme Ubc13 involved in proinflammatory signaling. Here we demonstrate a crucial role for STAT3 antiinflammatory activity in preservation of HSPCs and lineage-balanced hematopoiesis. Conditional Stat3 removal from the hematopoietic system led to depletion of the bone marrow lineage- Sca-1+ c-Kit+ CD150+ CD48- HSPC subset (LSK CD150+ CD48- cells), myeloid-skewed hematopoiesis, and accrual of DNA damage in HSPCs. These responses were accompanied by intrinsic transcriptional alterations in HSPCs, including deregulation of inflammatory, survival and developmental pathways. Concomitant Ube2n/Ubc13 deletion from Stat3-deficient hematopoietic cells enabled lineage-balanced hematopoiesis, mitigated depletion of bone marrow LSK CD150+ CD48- cells, alleviated HSPC DNA damage, and corrected a majority of aberrant transcriptional responses. These results indicate an intrinsic protective role for STAT3 in the hematopoietic system, and suggest that this is mediated by STAT3-dependent restraint of excessive proinflammatory signaling via Ubc13 modulation.
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Affiliation(s)
- Huiyuan Zhang
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Haiyan S Li
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Emily J Hillmer
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Yang Zhao
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Taylor T Chrisikos
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
- The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77030
| | - Hongbo Hu
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Xiao Wu
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Erika J Thompson
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Karen Clise-Dwyer
- Department of Stem Cell Transplantation Research, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Karen A Millerchip
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Yue Wei
- Department of Leukemia, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Nahum Puebla-Osorio
- Department of Lymphoma and Myeloma, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Saakshi Kaushik
- Department of Epigenetics and Molecular Carcinogenesis, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Margarida A Santos
- Department of Epigenetics and Molecular Carcinogenesis, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Bin Wang
- Department of Genetics, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | | | - Jing Wang
- Department of Bioinformatics and Computational Biology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
| | - Shao-Cong Sun
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030
- The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77030
| | - Stephanie S Watowich
- Department of Immunology, University of Texas MD Anderson Cancer Center, Houston, TX 77030;
- The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77030
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Abstract
The transcriptional regulator STAT3 has key roles in vertebrate development and mature tissue function including control of inflammation and immunity. Mutations in human STAT3 associate with diseases such as immunodeficiency, autoimmunity and cancer. Strikingly, however, either hyperactivation or inactivation of STAT3 results in human disease, indicating tightly regulated STAT3 function is central to health. Here, we attempt to summarize information on the numerous and distinct biological actions of STAT3, and highlight recent discoveries, with a specific focus on STAT3 function in the immune and hematopoietic systems. Our goal is to spur investigation on mechanisms by which aberrant STAT3 function drives human disease and novel approaches that might be used to modulate disease outcome.
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Affiliation(s)
- Emily J Hillmer
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Huiyuan Zhang
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Haiyan S Li
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Stephanie S Watowich
- Department of Immunology, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA; The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77030, USA.
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