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Poscablo DM, Worthington AK, Smith-Berdan S, Rommel MGE, Manso BA, Adili R, Mok L, Reggiardo RE, Cool T, Mogharrab R, Myers J, Dahmen S, Medina P, Beaudin AE, Boyer SW, Holinstat M, Jonsson VD, Forsberg EC. An age-progressive platelet differentiation path from hematopoietic stem cells causes exacerbated thrombosis. Cell 2024; 187:3090-3107.e21. [PMID: 38749423 DOI: 10.1016/j.cell.2024.04.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 02/05/2024] [Accepted: 04/16/2024] [Indexed: 06/09/2024]
Abstract
Platelet dysregulation is drastically increased with advanced age and contributes to making cardiovascular disorders the leading cause of death of elderly humans. Here, we reveal a direct differentiation pathway from hematopoietic stem cells into platelets that is progressively propagated upon aging. Remarkably, the aging-enriched platelet path is decoupled from all other hematopoietic lineages, including erythropoiesis, and operates as an additional layer in parallel with canonical platelet production. This results in two molecularly and functionally distinct populations of megakaryocyte progenitors. The age-induced megakaryocyte progenitors have a profoundly enhanced capacity to engraft, expand, restore, and reconstitute platelets in situ and upon transplantation and produce an additional platelet population in old mice. The two pools of co-existing platelets cause age-related thrombocytosis and dramatically increased thrombosis in vivo. Strikingly, aging-enriched platelets are functionally hyper-reactive compared with the canonical platelet populations. These findings reveal stem cell-based aging as a mechanism for platelet dysregulation and age-induced thrombosis.
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Affiliation(s)
- Donna M Poscablo
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Atesh K Worthington
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Stephanie Smith-Berdan
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Biomolecular Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Marcel G E Rommel
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Bryce A Manso
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Reheman Adili
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Lydia Mok
- Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Roman E Reggiardo
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Taylor Cool
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Raana Mogharrab
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Jenna Myers
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Steven Dahmen
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Paloma Medina
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Biomolecular Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Anna E Beaudin
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Scott W Boyer
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Program in Biomedical Science and Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - Michael Holinstat
- Department of Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Vanessa D Jonsson
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Biomolecular Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Applied Mathematics, Genomics Institute, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
| | - E Camilla Forsberg
- Institute for the Biology of Stem Cells, University of California, Santa Cruz, Santa Cruz, CA 95064, USA; Biomolecular Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA.
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2
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Vink CS, Popravko A, Dzierzak E. De novo hematopoietic (stem) cell generation - A differentiation or stochastic process? Curr Opin Cell Biol 2023; 85:102255. [PMID: 37806296 DOI: 10.1016/j.ceb.2023.102255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 08/28/2023] [Accepted: 09/10/2023] [Indexed: 10/10/2023]
Abstract
The hematopoietic system is one of the earliest tissues to develop. De novo generation of hematopoietic progenitor and stem cells occurs through a transdifferentiation of (hemogenic) endothelial cells to hematopoietic identity, resulting in the formation of intra-aortic hematopoietic cluster (IAHC) cells. Heterogeneity of IAHC cell phenotypes and functions has stymied the field in its search for the transcriptional program of emerging hematopoietic stem cells (HSCs), given that an individual IAHC cannot be simultaneously examined for function and transcriptome. Several models could account for this heterogeneity, including a novel model suggesting that the transcriptomes of individual emerging IAHC cells are in an unstable/metastable state, with pivotal hematopoietic transcription factors expressed dynamically due to transcriptional pulsing and combinatorial activities. The question remains - how is functional hematopoietic cell fate established - is the process stochastic? This article touches upon these important issues, which may be relevant to the field's inability to make HSCs ex vivo.
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Affiliation(s)
- Chris S Vink
- The University of Edinburgh, Centre for Inflammation Research, Edinburgh, Midlothian, Scotland, EH16 4UU, UK
| | - Anna Popravko
- The University of Edinburgh, Centre for Inflammation Research, Edinburgh, Midlothian, Scotland, EH16 4UU, UK
| | - Elaine Dzierzak
- The University of Edinburgh, Centre for Inflammation Research, Edinburgh, Midlothian, Scotland, EH16 4UU, UK.
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3
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Jassinskaja M, Gonka M, Kent DG. Resolving the hematopoietic stem cell state by linking functional and molecular assays. Blood 2023; 142:543-552. [PMID: 36735913 PMCID: PMC10644060 DOI: 10.1182/blood.2022017864] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/17/2023] [Accepted: 01/17/2023] [Indexed: 02/05/2023] Open
Abstract
One of the most challenging aspects of stem cell research is the reliance on retrospective assays for ascribing function. This is especially problematic for hematopoietic stem cell (HSC) research in which the current functional assay that formally establishes its HSC identity involves long-term serial transplantation assays that necessitate the destruction of the initial cell state many months before knowing that it was, in fact, an HSC. In combination with the explosion of equally destructive single-cell molecular assays, the paradox facing researchers is how to determine the molecular state of a functional HSC when you cannot concomitantly assess its functional and molecular properties. In this review, we will give a historical overview of the functional and molecular assays in the field, identify new tools that combine molecular and functional readouts in populations of HSCs, and imagine the next generation of computational and molecular profiling tools that may help us better link cell function with molecular state.
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Affiliation(s)
- Maria Jassinskaja
- Department of Biology, York Biomedical Research Institute, University of York, York, United Kingdom
| | - Monika Gonka
- Department of Biology, York Biomedical Research Institute, University of York, York, United Kingdom
| | - David G. Kent
- Department of Biology, York Biomedical Research Institute, University of York, York, United Kingdom
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4
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Bastani S, Staal FJT, Canté-Barrett K. The quest for the holy grail: overcoming challenges in expanding human hematopoietic stem cells for clinical use. Stem Cell Investig 2023; 10:15. [PMID: 37457748 PMCID: PMC10345135 DOI: 10.21037/sci-2023-016] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 06/19/2023] [Indexed: 07/18/2023]
Abstract
Hematopoietic stem cell (HSC) transplantation has been the golden standard for many hematological disorders. However, the number of HSCs obtained from several sources, including umbilical cord blood (UCB), often is insufficient for transplantation. For decades, maintaining or even expanding HSCs for therapeutic purposes has been a "holy grail" in stem cell biology. Different methods have been proposed to improve the efficiency of cell expansion and enhance homing potential such as co-culture with stromal cells or treatment with specific agents. Recent progress has shown that this is starting to become feasible using serum-free and well-defined media. Some of these protocols to expand HSCs along with genetic modification have been successfully applied in clinical trials and some others are studied in preclinical and clinical studies. However, the main challenges regarding ex vivo expansion of HSCs such as limited growth potential and tendency to differentiate in culture still need improvements. Understanding the biology of blood stem cells, their niche and signaling pathways has provided possibilities to regulate cell fate decisions and manipulate cells to optimize expansion of HSCs in vitro. Here, we review the plethora of HSC expansion protocols that have been proposed and indicate the current state of the art for their clinical application.
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Affiliation(s)
- Sepideh Bastani
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
| | - Frank J. T. Staal
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Pediatrics, Leiden University Medical Center, Leiden, The Netherlands
- The Novo Nordisk Foundation Center for Stem Cell Medicine (reNEW), Leiden University Medical Center, Leiden, The Netherlands
| | - Kirsten Canté-Barrett
- Department of Immunology, Leiden University Medical Center, Leiden, The Netherlands
- The Novo Nordisk Foundation Center for Stem Cell Medicine (reNEW), Leiden University Medical Center, Leiden, The Netherlands
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Martin EW, Rodriguez y Baena A, Reggiardo RE, Worthington AK, Mattingly CS, Poscablo DM, Krietsch J, McManus MT, Carpenter S, Kim DH, Forsberg EC. Dynamics of Chromatin Accessibility During Hematopoietic Stem Cell Differentiation Into Progressively Lineage-Committed Progeny. Stem Cells 2023; 41:520-539. [PMID: 36945732 PMCID: PMC10183972 DOI: 10.1093/stmcls/sxad022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Accepted: 02/27/2023] [Indexed: 03/23/2023]
Abstract
Epigenetic mechanisms regulate the multilineage differentiation capacity of hematopoietic stem cells (HSCs) into a variety of blood and immune cells. Mapping the chromatin dynamics of functionally defined cell populations will shed mechanistic insight into 2 major, unanswered questions in stem cell biology: how does epigenetic identity contribute to a cell type's lineage potential, and how do cascades of chromatin remodeling dictate ensuing fate decisions? Our recent work revealed evidence of multilineage gene priming in HSCs, where open cis-regulatory elements (CREs) exclusively shared between HSCs and unipotent lineage cells were enriched for DNA binding motifs of known lineage-specific transcription factors. Oligopotent progenitor populations operating between the HSCs and unipotent cells play essential roles in effecting hematopoietic homeostasis. To test the hypothesis that selective HSC-primed lineage-specific CREs remain accessible throughout differentiation, we used ATAC-seq to map the temporal dynamics of chromatin remodeling during progenitor differentiation. We observed epigenetic-driven clustering of oligopotent and unipotent progenitors into distinct erythromyeloid and lymphoid branches, with multipotent HSCs and MPPs associating with the erythromyeloid lineage. We mapped the dynamics of lineage-primed CREs throughout hematopoiesis and identified both unique and shared CREs as potential lineage reinforcement mechanisms at fate branch points. Additionally, quantification of genome-wide peak count and size revealed overall greater chromatin accessibility in HSCs, allowing us to identify HSC-unique peaks as putative regulators of self-renewal and multilineage potential. Finally, CRISPRi-mediated targeting of ATACseq-identified putative CREs in HSCs allowed us to demonstrate the functional role of selective CREs in lineage-specific gene expression. These findings provide insight into the regulation of stem cell multipotency and lineage commitment throughout hematopoiesis and serve as a resource to test functional drivers of hematopoietic lineage fate.
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Affiliation(s)
- Eric W Martin
- Institute for the Biology of Stem Cells, Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Alessandra Rodriguez y Baena
- Institute for the Biology of Stem Cells, Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Roman E Reggiardo
- Institute for the Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Atesh K Worthington
- Institute for the Biology of Stem Cells, Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Connor S Mattingly
- Institute for the Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Donna M Poscablo
- Institute for the Biology of Stem Cells, Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Jana Krietsch
- Institute for the Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Michael T McManus
- Department of Microbiology and Immunology, Diabetes Center, W.M. Keck Center for Noncoding RNAs, University of California San Francisco, San Francisco, CA, USA
| | - Susan Carpenter
- Institute for the Biology of Stem Cells, Department of Molecular, Cell and Developmental Biology, University of California Santa Cruz, Santa Cruz, CA, USA
| | - Daniel H Kim
- Institute for the Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, USA
| | - E Camilla Forsberg
- Institute for the Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA, USA
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6
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Huang X, Wang Y, Wang T, Wen F, Liu S, Oudeng G. Recent advances in engineering hydrogels for niche biomimicking and hematopoietic stem cell culturing. Front Bioeng Biotechnol 2022; 10:1049965. [PMID: 36507253 PMCID: PMC9730123 DOI: 10.3389/fbioe.2022.1049965] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/07/2022] [Indexed: 11/25/2022] Open
Abstract
Hematopoietic stem cells (HSCs) provide a life-long supply of haemopoietic cells and are indispensable for clinical transplantation in the treatment of malignant hematological diseases. Clinical applications require vast quantities of HSCs with maintained stemness characteristics. Meeting this demand poses often insurmountable challenges for traditional culture methods. Creating a supportive artificial microenvironment for the culture of HSCs, which allows the expansion of the cells while maintaining their stemness, is becoming a new solution for the provision of these rare multipotent HSCs. Hydrogels with good biocompatibility, excellent hydrophilicity, tunable biochemical and biophysical properties have been applied in mimicking the hematopoietic niche for the efficient expansion of HSCs. This review focuses on recent progress in the use of hydrogels in this specialized application. Advanced biomimetic strategies use for the creation of an artificial haemopoietic niche are discussed, advances in combined use of hydrogel matrices and microfluidics, including the emerging organ-on-a-chip technology, are summarized. We also provide a brief description of novel stimulus-responsive hydrogels that are used to establish an intelligent dynamic cell microenvironment. Finally, current challenges and future perspectives of engineering hydrogels for HSC biomedicine are explored.
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Affiliation(s)
- Xiaochan Huang
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen, Guangdong, China
| | - Yuting Wang
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen, Guangdong, China,Shenzhen Children’s Hospital, China Medical University, Shenzhen, Guangdong, China
| | - Tianci Wang
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen, Guangdong, China
| | - Feiqiu Wen
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen, Guangdong, China,Shenzhen Children’s Hospital, China Medical University, Shenzhen, Guangdong, China,*Correspondence: Feiqiu Wen, ; Sixi Liu, ; Gerile Oudeng,
| | - Sixi Liu
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen, Guangdong, China,*Correspondence: Feiqiu Wen, ; Sixi Liu, ; Gerile Oudeng,
| | - Gerile Oudeng
- Department of Hematology and Oncology, Shenzhen Children’s Hospital, Shenzhen, Guangdong, China,*Correspondence: Feiqiu Wen, ; Sixi Liu, ; Gerile Oudeng,
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7
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Rodriguez Y Baena A, Rajendiran S, Manso BA, Krietsch J, Boyer SW, Kirschmann J, Forsberg EC. New transgenic mouse models enabling pan-hematopoietic or selective hematopoietic stem cell depletion in vivo. Sci Rep 2022; 12:3156. [PMID: 35210475 PMCID: PMC8873235 DOI: 10.1038/s41598-022-07041-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 02/07/2022] [Indexed: 12/22/2022] Open
Abstract
Hematopoietic stem cell (HSC) multipotency and self-renewal are typically defined through serial transplantation experiments. Host conditioning is necessary for robust HSC engraftment, likely by reducing immune-mediated rejection and by clearing limited HSC niche space. Because irradiation of the recipient mouse is non-specific and broadly damaging, there is a need to develop alternative models to study HSC performance at steady-state and in the absence of radiation-induced stress. We have generated and characterized two new mouse models where either all hematopoietic cells or only HSCs can be specifically induced to die in vivo or in vitro. Hematopoietic-specific Vav1-mediated expression of a loxP-flanked diphtheria-toxin receptor (DTR) renders all hematopoietic cells sensitive to diphtheria toxin (DT) in “Vav-DTR” mice. Crossing these mice to Flk2-Cre mice results in “HSC-DTR” mice which exhibit HSC-selective DT sensitivity. We demonstrate robust, rapid, and highly selective cell ablation in these models. These new mouse models provide a platform to test whether HSCs are required for long-term hematopoiesis in vivo, for understanding the mechanisms regulating HSC engraftment, and interrogating in vivo hematopoietic differentiation pathways and mechanisms regulating hematopoietic homeostasis.
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Affiliation(s)
- Alessandra Rodriguez Y Baena
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA.,Program in Biomedical Sciences and Engineering, Department of Molecular, Cell, and Developmental Biology, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Smrithi Rajendiran
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA.,Biomolecular Engineering, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Bryce A Manso
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA.,Biomolecular Engineering, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Jana Krietsch
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA.,Biomolecular Engineering, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Scott W Boyer
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA.,Program in Biomedical Sciences and Engineering, Department of Molecular, Cell, and Developmental Biology, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA
| | - Jessica Kirschmann
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA
| | - E Camilla Forsberg
- Institute for the Biology of Stem Cells, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA. .,Biomolecular Engineering, University of California-Santa Cruz, Santa Cruz, CA, 95064, USA.
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8
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Cool T, Baena ARY, Forsberg EC. Clearing the Haze: How Does Nicotine Affect Hematopoiesis before and after Birth? Cancers (Basel) 2021; 14:184. [PMID: 35008347 PMCID: PMC8750289 DOI: 10.3390/cancers14010184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 12/24/2021] [Accepted: 12/28/2021] [Indexed: 11/24/2022] Open
Abstract
Hematopoiesis is a tightly regulated process orchestrated by cell-intrinsic and cell-extrinsic cues. Over the past several decades, much effort has been focused on understanding how these cues regulate hematopoietic stem cell (HSC) function. Many endogenous key regulators of hematopoiesis have been identified and extensively characterized. Less is known about the mechanisms of long-term effects of environmental toxic compounds on hematopoietic stem and progenitor cells (HSPCs) and their mature immune cell progeny. Research over the past several decades has demonstrated that tobacco products are extremely toxic and pose huge risks to human health by causing diseases like cancer, respiratory illnesses, strokes, and more. Recently, electronic cigarettes have been promoted as a safer alternative to traditional tobacco products and have become increasingly popular among younger generations. Nicotine, the highly toxic compound found in many traditional tobacco products, is also found in most electronic cigarettes, calling into question their purported "safety". Although it is known that nicotine is toxic, the pathophysiology of disease in exposed people remains under investigation. One plausible contributor to altered disease susceptibility is altered hematopoiesis and associated immune dysfunction. In this review, we focus on research that has addressed how HSCs and mature blood cells respond to nicotine, as well as identify remaining questions.
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Affiliation(s)
- Taylor Cool
- Program in Molecular, Cell, and Developmental Biology, Institute for the Biology of Stem Cells, University of California Santa Cruz, Santa Cruz, CA 95064, USA; (T.C.); (A.R.y.B.)
| | - Alessandra Rodriguez y Baena
- Program in Molecular, Cell, and Developmental Biology, Institute for the Biology of Stem Cells, University of California Santa Cruz, Santa Cruz, CA 95064, USA; (T.C.); (A.R.y.B.)
| | - E. Camilla Forsberg
- Institute for the Biology of Stem Cells, Department of Biomolecular Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA
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