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Ng J, Marneth AE, Griffith A, Younger D, Ghanta S, Jiao A, Willis G, Han J, Imani J, Niu B, Keegan JW, Hancock B, Guo F, Shi Y, Perrella MA, Lederer JA. Mesenchymal Stromal Cells Facilitate Neutrophil-Trained Immunity by Reprogramming Hematopoietic Stem Cells. J Innate Immun 2023; 15:765-781. [PMID: 37797588 PMCID: PMC10622164 DOI: 10.1159/000533732] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 07/20/2023] [Indexed: 10/07/2023] Open
Abstract
Novel therapeutics are urgently needed to prevent opportunistic infections in immunocompromised individuals undergoing cancer treatments or other immune-suppressive therapies. Trained immunity is a promising strategy to reduce this burden of disease. We previously demonstrated that mesenchymal stromal cells (MSCs) preconditioned with a class A CpG oligodeoxynucleotide (CpG-ODN), a Toll-like receptor 9 (TLR9) agonist, can augment emergency granulopoiesis in a murine model of neutropenic sepsis. Here, we used a chimeric mouse model to demonstrate that MSCs secrete paracrine factors that act on lineage-negative c-kit+ hematopoietic stem cells (HSCs), leaving them "poised" to enhance emergency granulopoiesis months after transplantation. Chimeric mice developed from HSCs exposed to conditioned media from MSCs and CpG-ODN-preconditioned MSCs showed significantly higher bacterial clearance and increased neutrophil granulopoiesis following lung infection than control mice. By Cleavage Under Targets and Release Using Nuclease (CUT&RUN) chromatin sequencing, we identified that MSC-conditioned media leaves H3K4me3 histone marks in HSCs at genes involved in myelopoiesis and in signaling persistence by the mTOR pathway. Both soluble factors and extracellular vesicles from MSCs mediated these effects on HSCs and proteomic analysis by mass spectrometry revealed soluble calreticulin as a potential mediator. In summary, this study demonstrates that trained immunity can be mediated by paracrine factors from MSCs to induce neutrophil-trained immunity by reprogramming HSCs for long-lasting functional changes in neutrophil-mediated antimicrobial immunity.
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Affiliation(s)
- Julie Ng
- Division of Pulmonary and Critical Care, Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Anna E. Marneth
- Division of Hematology, Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Alec Griffith
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
| | - Daniel Younger
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
| | - Sailaja Ghanta
- Department of Pediatric Newborn Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Alan Jiao
- Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Gareth Willis
- Department of Pediatric Newborn Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Junwen Han
- Division of Pulmonary and Critical Care, Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Jewel Imani
- Division of Pulmonary and Critical Care, Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - Bailin Niu
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
| | - Joshua W. Keegan
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
| | - Brandon Hancock
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
| | - Fei Guo
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
| | - Yang Shi
- Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - Mark A. Perrella
- Division of Pulmonary and Critical Care, Department of Medicine, Brigham and Women’s Hospital, Boston, MA, USA
- Department of Pediatric Newborn Medicine, Brigham and Women’s Hospital, Boston, MA, USA
| | - James A. Lederer
- Department of Surgery, Brigham and Women’s Hospital, Boston, MA, USA
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Evidence for Recombinant GRP78, CALR, PDIA3 and GPI as Mediators of Genetic Instability in Human CD34+ Cells. Cancers (Basel) 2022; 14:cancers14122883. [PMID: 35740549 PMCID: PMC9221337 DOI: 10.3390/cancers14122883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/03/2022] [Accepted: 06/08/2022] [Indexed: 12/10/2022] Open
Abstract
Soluble factors released from irradiated human mesenchymal stromal cells (MSC) may induce genetic instability in human CD34+ cells, potentially mediating hematologic disorders. Recently, we identified four key proteins in the secretome of X-ray-irradiated MSC, among them three endoplasmic reticulum proteins, the 78 kDa glucose-related protein (GRP78), calreticulin (CALR), and protein disulfide-isomerase A3 (PDIA3), as well as the glycolytic enzyme glucose-6-phosphate isomerase (GPI). Here, we demonstrate that exposition of CD34+ cells to recombinant GRP78, CALR, PDIA3 and GPI induces substantial genetic instability. Increased numbers of γH2AX foci (p < 0.0001), centrosome anomalies (p = 0.1000) and aberrant metaphases (p = 0.0022) were detected in CD34+ cells upon incubation with these factors. Specifically, γH2AX foci were found to be induced 4−5-fold in response to any individual of the four factors, and centrosome anomalies by 3−4 fold compared to control medium, which contained none of the recombinant proteins. Aberrant metaphases, not seen in the context of control medium, were detected to a similar extent than centrosome anomalies across the four factors. Notably, the strongest effects were observed when all four factors were collectively provided. In summary, our data suggest that specific components of the secretome from irradiated MSC act as mediators of genetic instability in CD34+ cells, thereby possibly contributing to the pathogenesis of radiation-induced hematologic disorders beyond direct radiation-evoked DNA strand breaks.
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