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The Multifaceted Roles Neutrophils Play in the Tumor Microenvironment. CANCER MICROENVIRONMENT 2014; 8:125-58. [PMID: 24895166 DOI: 10.1007/s12307-014-0147-5] [Citation(s) in RCA: 283] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/01/2014] [Accepted: 05/19/2014] [Indexed: 02/06/2023]
Abstract
Neutrophils are myeloid cells that constitute 50-70 % of all white blood cells in the human circulation. Traditionally, neutrophils are viewed as the first line of defense against infections and as a major component of the inflammatory process. In addition, accumulating evidence suggest that neutrophils may also play a key role in multiple aspects of cancer biology. The possible involvement of neutrophils in cancer prevention and promotion was already suggested more than half a century ago, however, despite being the major component of the immune system, their contribution has often been overshadowed by other immune components such as lymphocytes and macrophages. Neutrophils seem to have conflicting functions in cancer and can be classified into anti-tumor (N1) and pro-tumor (N2) sub-populations. The aim of this review is to discuss the varying nature of neutrophil function in the cancer microenvironment with a specific emphasis on the mechanisms that regulate neutrophil mobilization, recruitment and activation.
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202
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Myeloid-derived suppressor cells in sepsis. BIOMED RESEARCH INTERNATIONAL 2014; 2014:598654. [PMID: 24995313 PMCID: PMC4065675 DOI: 10.1155/2014/598654] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 05/03/2014] [Indexed: 11/18/2022]
Abstract
Sepsis is a systemic, deleterious host response to widespread infection. Patients with sepsis will have documented or suspected infection which can progress to a state of septic shock or acute organ dysfunction. Since sepsis is responsible for nearly 3 million cases per year in China and severe sepsis is a common, expensive fatal condition in America, developing new therapies becomes a significant and worthwhile challenge. Clinical research has shown that sepsis-associated immunosuppression plays a central role in patient mortality, and targeted immune-enhancing therapy may be an effective treatment approach in these patients. As part of the inflammatory response during sepsis, there are elevations in the number of myeloid-derived suppressor cells (MDSCs). MDSCs are a heterogeneous population of immature myeloid cells that possess immunosuppressive activities via suppressing T-cell proliferation and activation. The role of MDSCs in sepsis remains uncertain. Some believe activated MDSCs are beneficial to the sepsis host by increasing innate immune responses and antimicrobial activities, while others think expansion of MDSCs leads to adaptive immune suppression and secondary infection. Herein, we discuss the complex role of MDSCs in immune regulation during sepsis, as well as the potential to target these cells for therapeutic benefit.
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203
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Abstract
Severe congenital neutropenia (SCN) is characterized by low numbers of peripheral neutrophil granulocytes and a predisposition to life-threatening bacterial infections. We describe a novel genetic SCN type in 2 unrelated families associated with recessively inherited loss-of-function mutations in CSF3R, encoding the granulocyte colony-stimulating factor (G-CSF) receptor. Family A, with 3 affected children, carried a homozygous missense mutation (NM_000760.3:c.922C>T, NP_000751.1:p.Arg308Cys), which resulted in perturbed N-glycosylation and aberrant localization to the cell surface. Family B, with 1 affected infant, carried compound heterozygous deletions provoking frameshifts and premature stop codons (NM_000760.3:c.948_963del, NP_000751.1:p.Gly316fsTer322 and NM_000760.3:c.1245del, NP_000751.1:p.Gly415fsTer432). Despite peripheral SCN, all patients had morphologic evidence of full myeloid cell maturation in bone marrow. None of the patients responded to treatment with recombinant human G-CSF. Our study highlights the genetic and morphologic SCN variability and provides evidence both for functional importance and redundancy of G-CSF receptor-mediated signaling in human granulopoiesis.
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204
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Asquith M, Pasala S, Engelmann F, Haberthur K, Meyer C, Park B, Grant KA, Messaoudi I. Chronic ethanol consumption modulates growth factor release, mucosal cytokine production, and microRNA expression in nonhuman primates. Alcohol Clin Exp Res 2014; 38:980-93. [PMID: 24329418 PMCID: PMC3984381 DOI: 10.1111/acer.12325] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 10/07/2013] [Indexed: 01/10/2023]
Abstract
BACKGROUND Chronic alcohol consumption has been associated with enhanced susceptibility to both systemic and mucosal infections. However, the exact mechanisms underlying this enhanced susceptibility remain incompletely understood. METHODS Using a nonhuman primate model of ethanol (EtOH) self-administration, we examined the impact of chronic alcohol exposure on immune homeostasis, cytokine, and growth factor production in peripheral blood, lung, and intestinal mucosa following 12 months of chronic EtOH exposure. RESULTS EtOH exposure inhibited activation-induced production of growth factors hepatocyte growth factor (HGF), granulocyte colony-stimulating factor (G-CSF), and vascular-endothelial growth factor (VEGF) by peripheral blood mononuclear cells (PBMC). Moreover, EtOH significantly reduced the frequency of colonic Th1 and Th17 cells in a dose-dependent manner. In contrast, we did not observe differences in lymphocyte frequency or soluble factor production in the lung of EtOH-consuming animals. To uncover mechanisms underlying reduced growth factor and Th1/Th17 cytokine production, we compared expression levels of microRNAs in PBMC and intestinal mucosa. Our analysis revealed EtOH-dependent up-regulation of distinct microRNAs in affected tissues (miR-181a and miR-221 in PBMC; miR-155 in colon). Moreover, we were able to detect reduced expression of the transcription factors STAT3 and ARNT, which regulate expression of VEGF, G-CSF, and HGF and contain targets for these microRNAs. To confirm and extend these observations, PBMC were transfected with either mimics or antagomirs of miR-181 and miR-221, and protein levels of the transcription factors and growth factors were determined. Transfection of microRNA mimics led to a reduction in both STAT3/ARNT as well as VEGF/HGF/G-CSF levels. The opposite outcome was observed when microRNA antagomirs were transfected. CONCLUSIONS Chronic EtOH consumption significantly disrupts both peripheral and mucosal immune homeostasis, and this dysregulation may be mediated by changes in microRNA expression.
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Affiliation(s)
- Mark Asquith
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
| | - Sumana Pasala
- Division of Biomedical Sciences, School of Medicine, University of California-Riverside, Riverside, CA 92521
| | - Flora Engelmann
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
| | - Kristen Haberthur
- Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, USA
| | - Christine Meyer
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
| | - Byung Park
- Division of Biostatistics, Department of Public Health and Preventive Medicine, Oregon Health and Science University, Portland, OR, USA
| | - Kathleen A. Grant
- Department of Behavioral Neuroscience, Oregon Health and Science University, Portland, OR, USA
- Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR, USA
| | - Ilhem Messaoudi
- Division of Pathobiology and Immunology, Oregon National Primate Research Center, Oregon Health and Science University, Beaverton, OR, USA
- Division of Biomedical Sciences, School of Medicine, University of California-Riverside, Riverside, CA 92521
- Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, OR, USA
- Division of Neuroscience, Oregon National Primate Research Center, Beaverton, OR, USA
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205
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G-CSF regulates hematopoietic stem cell activity, in part, through activation of Toll-like receptor signaling. Leukemia 2014; 28:1851-60. [PMID: 24518205 PMCID: PMC4130805 DOI: 10.1038/leu.2014.68] [Citation(s) in RCA: 108] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 02/03/2014] [Accepted: 02/06/2014] [Indexed: 02/06/2023]
Abstract
Recent studies demonstrate that inflammatory signals regulate hematopoietic stem cells (HSCs). Granulocyte-colony stimulating factor (G-CSF) is often induced with infection and plays a key role in the stress granulopoiesis response. However, its effects on HSCs are less clear. Herein, we show that treatment with G-CSF induces expansion and increased quiescence of phenotypic HSCs, but causes a marked, cell-autonomous HSC repopulating defect associated with induction of toll-like receptor (TLR) expression and signaling. The G-CSF-mediated expansion of HSCs is reduced in mice lacking TLR2, TLR4 or the TLR signaling adaptor MyD88. Induction of HSC quiescence is abrogated in mice lacking MyD88 or in mice treated with antibiotics to suppress intestinal flora. Finally, loss of TLR4 or germ free conditions mitigates the G-CSF-mediated HSC repopulating defect. These data suggest that low level TLR agonist production by commensal flora contributes to the regulation of HSC function and that G-CSF negatively regulates HSCs, in part, by enhancing TLR signaling.
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206
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Li W, Yang S, Kim SO, Reid G, Challis JRG, Bocking AD. Lipopolysaccharide-Induced Profiles of Cytokine, Chemokine, and Growth Factors Produced by Human Decidual Cells Are Altered by Lactobacillus rhamnosus GR-1 Supernatant. Reprod Sci 2014; 21:939-947. [PMID: 24429676 DOI: 10.1177/1933719113519171] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of this study was to assess the effects of bacterial lipopolysaccharide (LPS) and Lactobacillus rhamnosus GR-1 supernatant (GR-1SN) on secretion profiles of cytokines, chemokines, and growth factors from primary cultures of human decidual cells. Lipopolysaccharide significantly increased the output of proinflammatory cytokines (interleukin [IL]-1B, IL-2, IL-6, IL-12p70, IL-15, IL-17A, interferon gamma [IFN-γ], and tumor necrosis factor [TNF]); anti-inflammatory cytokines (IL-1RN, IL-4, IL-9, and IL-10); chemokines (IL-8, eotaxin, IFN-inducible protein 10 [IP-10], monocyte chemoattractant protein 1 [MCP-1], macrophage inflammatory protein-1α [MIP-1α], macrophage inflammatory protein-1β [MIP-1β], and regulated on activation normal T cell expressed and secreted [RANTES]); and growth factors (granulocyte colony-stimulating factor [CSF] 3, CSF-2, and vascular endothelial growth factor A [VEGFA]). Lactobacillus rhamnosus GR-1SN alone significantly increased CSF-3, MIP-1α MIP-1β, and RANTES but decreased IL-15 and IP-10 output. The GR-1SN also significantly or partially reduced LPS-induced proinflammatory cytokines TNF, IFN-γ, IL-1β, IL-2 IL-6, IL-12p70, IL-15, IL-17, and IP-10; partially reduced LPS-induced anti-inflammatory cytokines IL-1RN, IL-4 and IL-10, and LPS-induced VEGFA output but did not affect CSF-3, MIP-1α, MIP-1β, MCP-1, IL-8, and IL-9. Our results demonstrate that GR-1SN attenuates the inflammatory responses to LPS by human decidual cells, suggesting its potential role in ameliorating intrauterine infection.
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Affiliation(s)
- Wei Li
- Departments of Obstetrics/Gynaecology, Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Siwen Yang
- Departments of Obstetrics/Gynaecology, Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
| | - Sung O Kim
- Departments of Microbiology, Immunology and Surgery, University of Western Ontario, Siebens Drake Research Institute, London, Ontario, Canada
| | - Gregor Reid
- Departments of Microbiology, Immunology and Surgery, University of Western Ontario, Siebens Drake Research Institute, London, Ontario, Canada Canadian Research and Development Centre for Probiotics, Lawson Health Research Institute, London, Ontario, Canada
| | - John R G Challis
- Departments of Obstetrics/Gynaecology, Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada Faculty of Health Sciences, Suite 11022, Blusson Hall, Simon Fraser University, Vancouver, BC, Canada
| | - Alan D Bocking
- Departments of Obstetrics/Gynaecology, Physiology and Medicine, University of Toronto, Toronto, Ontario, Canada Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada
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207
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Papadaki HA, Pontikoglou C. Pathophysiologic mechanisms, clinical features and treatment of idiopathic neutropenia. Expert Rev Hematol 2014; 1:217-29. [DOI: 10.1586/17474086.1.2.217] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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208
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Kumar J, Ward AC. Role of the interleukin 6 receptor family in epithelial ovarian cancer and its clinical implications. Biochim Biophys Acta Rev Cancer 2014; 1845:117-25. [PMID: 24388871 DOI: 10.1016/j.bbcan.2013.12.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 12/08/2013] [Accepted: 12/24/2013] [Indexed: 01/10/2023]
Abstract
Ovarian cancer is the most lethal gynecological malignancy, with few effective treatment options in most cases. Therefore, understanding the biology of ovarian cancer remains an important area of research in order to improve clinical outcomes. Cytokine receptor signaling through the Janus kinase-signal transducer and activator of transcription (JAK-STAT) pathway is an essential component of normal development and homeostasis. However, numerous studies have implicated perturbation of this pathway in a range of cancers. In particular, members of the IL-6R family acting via the downstream STAT3 transcription factor play an important role in a number of solid tumors - including ovarian cancer - by altering the expression of target genes that impact on key phenotypes. This has led to the development of specific inhibitors of this pathway which are being used in combination with standard chemotherapeutic agents. This review focuses on the role of IL-6R family members in the etiology of epithelial ovarian cancer, and the application of therapies specifically targeting IL-6R signaling in this disease setting.
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Affiliation(s)
- Janani Kumar
- School of Medicine, Deakin University, Geelong, Victoria, Australia; Strategic Research Centre in Molecular and Medical Research, Deakin University, Geelong, Victoria, Australia
| | - Alister C Ward
- School of Medicine, Deakin University, Geelong, Victoria, Australia; Strategic Research Centre in Molecular and Medical Research, Deakin University, Geelong, Victoria, Australia.
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209
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The five “Ws” for bone pain due to the administration of granulocyte-colony stimulating factors (G-CSFs). Crit Rev Oncol Hematol 2014; 89:112-28. [DOI: 10.1016/j.critrevonc.2013.08.006] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 07/26/2013] [Accepted: 08/13/2013] [Indexed: 11/21/2022] Open
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210
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Ortega VA, Katzenback BA, Stafford JL, Belosevic M, Goss GG. Effects of polymer-coated metal oxide nanoparticles on goldfish (Carassius auratus L.) neutrophil viability and function. Nanotoxicology 2013; 9:23-33. [PMID: 24313973 DOI: 10.3109/17435390.2013.861943] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Exposure effects from polyacrylic acid (PAA) metal-oxide nanoparticles (TiO2, CeO2, Fe2O3, ZnO) on fish neutrophil viability and effector functions (degranulation, respiratory burst, inflammatory gene expression) were investigated using primary kidney goldfish (Carassius auratus L.) neutrophils as a model. Several studies have reported cytotoxic effects of NPs but there are limited reports on their potential to perturb the innate immune system of aquatic organisms. PAA-TiO2 significantly decreased neutrophil viability in a time and dose-dependent manner at all measured time points (0-48 h) and concentrations (0-200 µg/mL). Maximum viability decreased by (mean ± SEM): 67.1 ± 3.3%, 78.4 ± 4.2% and 74.9 ± 5.0% when exposed to 50, 100 and 200 µg/mL for 48 h, respectively. PAA-ZnO also significantly decreased neutrophil viability but only at 48 h exposures at higher concentrations. Neutrophil degranulation increased by approximately 3% after 30 min and by 8% after 4 h when exposed to sublethal doses (10 µg/mL) of PAA-CeO2 or PAA-Fe2O3. All PAA-NPs induced an increase in neutrophil respiratory burst when exposed to 10 µg/mL for 30 and 60 min, however, PAA-Fe2O3 was the only NP where the response was significant. Lastly, NPs altered the expression of a number of pro-inflammatory and immune genes, where PAA-TiO2 most significantly increased the mRNA levels of pro-inflammatory genes (il-1b, ifng) in neutrophils by 3 and 2.5 times, respectively. Together, these data demonstrate that goldfish neutrophils can be negatively affected from exposures to PAA-coated NPs and are functionally responsive to specific core-material properties at sublethal doses. These changes could perturb the innate response and affect the ability of fish to respond to pathogens.
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211
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Highly pathological influenza A virus infection is associated with augmented expression of PD-1 by functionally compromised virus-specific CD8+ T cells. J Virol 2013; 88:1636-51. [PMID: 24257598 DOI: 10.1128/jvi.02851-13] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
One question that continues to challenge influenza A research is why some strains of virus are so devastating compared to their more mild counterparts. We approached this question from an immunological perspective, investigating the CD8(+) T cell response in a mouse model system comparing high- and low-pathological influenza virus infections. Our findings reveal that the early (day 0 to 5) viral titer was not the determining factor in the outcome of disease. Instead, increased numbers of antigen-specific CD8(+) T cells and elevated effector function on a per-cell basis were found in the low-pathological infection and correlated with reduced illness and later-time-point (day 6 to 10) viral titer. High-pathological infection was associated with increased PD-1 expression on influenza virus-specific CD8(+) T cells, and blockade of PD-L1 in vivo led to reduced virus titers and increased CD8(+) T cell numbers in high- but not low-pathological infection, though T cell functionality was not restored. These data show that high-pathological acute influenza virus infection is associated with a dysregulated CD8(+) T cell response, which is likely caused by the more highly inflamed airway microenvironment during the early days of infection. Therapeutic approaches specifically aimed at modulating innate airway inflammation may therefore promote efficient CD8(+) T cell activity. We show that during a severe influenza virus infection, one type of immune cell, the CD8 T cell, is less abundant and less functional than in a more mild infection. This dysregulated T cell phenotype correlates with a lower rate of virus clearance in the severe infection and is partially regulated by the expression of a suppressive coreceptor called PD-1. Treatment with an antibody that blocks PD-1 improves T cell functionality and increases virus clearance.
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212
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Abstract
Tumour-induced granulocytic hyperplasia is associated with tumour vasculogenesis and escape from immunity via T cell suppression. Initially, these myeloid cells were identified as granulocytes or monocytes; however, recent studies have revealed that this hyperplasia is associated with populations of multipotent progenitor cells that have been identified as myeloid-derived suppressor cells (MDSCs). The study of MDSCs has provided a wealth of information regarding tumour pathobiology, has extended our understanding of neoplastic progression and has modified our approaches to immune adjuvant therapy. In this Timeline article, we discuss the history of MDSCs, their influence on tumour progression and metastasis, and the crosstalk between tumour cells, MDSCs and the host macroenvironment.
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Affiliation(s)
- James E Talmadge
- University of Nebraska Medical Center, Department of Pathology and Microbiology, 986495 Nebraska Medical Center, Omaha NE 68198-6495, USA
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213
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Herrera M, Salva S, Villena J, Barbieri N, Alvarez S. Lactobacillus rhamnosus CRL1505 enhances systemic and respiratory innate immune response in immunocompromised malnourished mice. J Funct Foods 2013. [DOI: 10.1016/j.jff.2013.07.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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214
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Decreased hematopoietic progenitor cell mobilization in pearl mice. Exp Hematol 2013; 41:848-57. [DOI: 10.1016/j.exphem.2013.05.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 05/14/2013] [Accepted: 05/19/2013] [Indexed: 11/21/2022]
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215
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A Type II Arabinogalactan from Anoectochilus formosanus for G-CSF Production in Macrophages and Leukopenia Improvement in CT26-Bearing Mice Treated with 5-Fluorouracil. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2013; 2013:458075. [PMID: 24191166 PMCID: PMC3804054 DOI: 10.1155/2013/458075] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 08/20/2013] [Accepted: 08/27/2013] [Indexed: 11/18/2022]
Abstract
Anoectochilus formosanus is an herb well known in Asian countries. The polysaccharide isolated from A. formosanus consists of type II arabinogalactan (AGAF), with branched 3,6-Gal as the major moiety. In this study, AGAF was examined for the granulocyte colony-stimulating factor (G-CSF) production and related protein expression in RAW 264.7 murine macrophages. The signaling pathway of G-CSF production involves AGAF and mitogen-activated protein kinases (MAPKs) inhibitors and pattern-recognition receptor antibodies. AGAF was evaluated to ease the leukopenia in CT26-colon-cancer-bearing mice treated with 5-fluorouracil (5-FU). The results of this study showed that AGAF was a stimulant for Toll-like receptor 2 and Dectin-1 and that it induced G-CSF production, through p38 and ERK MAPK, and NF- κ B pathways. In vivo examination showed that the oral administration of AGAF mitigated the side effects of leukopenia caused by 5-FU in colon-cancer-bearing mice. In conclusion, the botanic type II AGAF in this study was a potent G-CSF inducer in vivo and in vitro.
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216
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Improved cytotoxic T-lymphocyte immune responses to a tumor antigen by vaccines co-expressing the SLAM-associated adaptor EAT-2. Cancer Gene Ther 2013; 20:564-75. [PMID: 23949283 DOI: 10.1038/cgt.2013.53] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 07/09/2013] [Accepted: 07/11/2013] [Indexed: 01/21/2023]
Abstract
The signaling lymphocytic activation molecule-associated adaptor Ewing's sarcoma's-activated transcript 2 (EAT-2) is primarily expressed in dendritic cells, macrophages and natural killer cells. Including EAT-2 in a vaccination regimen enhanced innate and adaptive immune responses toward pathogen-derived antigens, even in the face of pre-existing vaccine immunity. Herein, we investigate whether co-vaccinations with two recombinant Ad5 (rAd5) vectors, one expressing the carcinoembryonic antigen (CEA) and one expressing EAT-2, can induce more potent CEA-specific cytotoxic T lymphocyte (CTL) and antitumor activity in the therapeutic CEA-expressing MC-38 tumor model. Our results suggest that inclusion of EAT-2 significantly alters the kinetics of Th1-biasing proinflammatory cytokine and chemokine responses, and enhances anti-CEA-specific CTL responses. As a result, rAd5-EAT2-augmented rAd5-CEA vaccinations are more efficient in eliminating CEA-expressing target cells as measured by an in vivo CTL assay. Administration of rAd5-EAT2 vaccines also reduced the rate of growth of MC-38 tumor growth in vivo. Also, an increase in MC-38 tumor cell apoptosis (as measured by hematoxylin and eosin staining, active caspase-3 and granzyme B levels within the tumors) was observed. These data provide evidence that more efficient, CEA-specific effector T cells are generated by rAd5 vaccines expressing CEA, when augmented by rAd5 vaccines expressing EAT-2, and this regimen may be a promising approach for cancer immunotherapy in general.
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217
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Hu L, Huang W, Hjort E, Eklund EA. Increased Fanconi C expression contributes to the emergency granulopoiesis response. J Clin Invest 2013; 123:3952-66. [PMID: 23925293 DOI: 10.1172/jci69032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Accepted: 06/13/2013] [Indexed: 01/05/2023] Open
Abstract
Emergency granulopoiesis is a component of the innate immune response that is induced in response to infectious or inflammatory challenge. It is characterized by the rapid expansion and differentiation of granulocyte/monocyte progenitor (GMP) populations, which is due in part to a shortened S-phase of the cell cycle. We found that IRF8 (also known as ICSBP), an interferon regulatory transcription factor that activates phagocyte effector genes during the innate immune response, activates the gene encoding Fanconi C (Fancc) in murine myeloid progenitor cells. Moreover, IRF8-induced Fancc transcription was augmented by treatment with IL-1β, an essential cytokine for emergency granulopoiesis. The Fanconi pathway participates in repair of stalled or collapsed replication forks during DNA replication, leading us to hypothesize that the Fanconi pathway contributes to genomic stability during emergency granulopoiesis. In support of this hypothesis, Fancc(-/-) mice developed anemia and neutropenia during repeated, failed episodes of emergency granulopoiesis. Failed emergency granulopoiesis in Fancc(-/-) mice was associated with excess apoptosis of HSCs and progenitor cells in the bone marrow and impaired HSC function. These studies have implications for understanding the pathogenesis of bone marrow failure in Fanconi anemia and suggest possible therapeutic approaches.
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Affiliation(s)
- Liping Hu
- Feinberg School of Medicine and Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611, USA
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218
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Is primary prophylaxis with granulocyte colony stimulating factor (G-CSF) indicated in the treatment of lymphoma? Transfus Apher Sci 2013; 49:51-5. [PMID: 23768687 DOI: 10.1016/j.transci.2013.05.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Febrile neutropenia (FN) is a common complication of cancer therapy. It can contribute to delays in treatment, increased rates of hospitalization, and severe infections. FN may also hinder completion of intended chemotherapy. Granulocyte colony stimulating factors (G-CSF) lower the rates of FN, infections, and hospitalization. Multiple national and international guidelines advocate the use of G-CSF in primary prophylaxis if the overall risk of FN is >20% (accounting for both patient and treatment-related risks). Lymphoma specific guidelines recommend G-CSF use in similar fashion. However, based on our updated review of published literature, we note that primary prophylaxis (PP) with G-CSF fails to improve overall survival as well as infection-related mortality. Moreover, lymphoma specific cost-effectiveness analyses on the use of PP have shed further doubt on the optimal use of this myeloid growth factor. In this general review, we will discuss whether PP with GCSF has any role in the management of adults with non-Hodgkin lymphoma.
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219
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Ohara K, Lin CC, Yang PJ, Hung WT, Yang WB, Cheng TJR, Fang JM, Wong CH. Synthesis and Bioactivity of β-(1→4)-Linked Oligomannoses and Partially Acetylated Derivatives. J Org Chem 2013; 78:6390-411. [DOI: 10.1021/jo4005266] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Keiichiro Ohara
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Chih-Chien Lin
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Pei-Jung Yang
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Wei-Ting Hung
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | - Wen-Bin Yang
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
| | | | - Jim-Min Fang
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Chi-Huey Wong
- The Genomics Research Center, Academia Sinica, Taipei 115, Taiwan
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220
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Lantow M, Sivakumar R, Zeumer L, Wasserfall C, Zheng YY, Atkinson MA, Morel L. The granulocyte colony stimulating factor pathway regulates autoantibody production in a murine induced model of systemic lupus erythematosus. Arthritis Res Ther 2013; 15:R49. [PMID: 23566364 PMCID: PMC3672747 DOI: 10.1186/ar4208] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 04/03/2013] [Indexed: 12/20/2022] Open
Abstract
Introduction An NZB-derived genetic locus (Sle2c2) that suppresses autoantibody production in a mouse model of induced systemic lupus erythematosus contains a polymorphism in the gene encoding the G-CSF receptor. This study was designed to test the hypothesis that the Sle2c2 suppression is associated with an impaired G-CSF receptor function that can be overcome by exogenous G-CSF. Methods Leukocytes from B6.Sle2c2 and B6 congenic mice, which carry a different allele of the G-CSF receptor, were compared for their responses to G-CSF. Autoantibody production was induced with the chronic graft-versus-host-disease (cGVHD) model by adoptive transfer of B6.bm12 splenocytes. Different treatment regimens varying the amount and frequency of G-CSF (Neulasta®) or carrier control were tested on cGVHD outcomes. Autoantibody production, immune cell activation, and reactive oxygen species (ROS) production were compared between the two strains with the various treatments. In addition, the effect of G-CSF treatment was examined on the production autoantibodies in the B6.Sle1.Sle2.Sle3 (B6.TC) spontaneous model of lupus. Results B6.Sle2c2 and B6 leukocytes responded differently to G-CSF. G-CSF binding by B6.Sle2c2 leukocytes was reduced as compared to B6, which was associated with a reduced expansion in response to in vivo G-CSF treatment. G-CSF in vivo treatment also failed to mobilize bone-marrow B6.Sle2c2 neutrophils as it did for B6 neutrophils. In contrast, the expression of G-CSF responsive genes indicated a higher G-CSF receptor signaling in B6.Sle2c2 cells. G-CSF treatment restored the ability of B6.Sle2c2 mice to produce autoantibodies in a dose-dependent manner upon cGVHD induction, which correlated with restored CD4+ T cells activation, as well as dendritic cell and granulocyte expansion. Steady-state ROS production was higher in B6.Sle2c2 than in B6 mice. cGVHD induction resulted in a larger increase in ROS production in B6 than in B6.Sle2c2 mice, and this difference was eliminated with G-CSF treatment. Finally, a low dose G-CSF treatment accelerated the production of anti-dsDNA IgG in young B6.TC mice. Conclusion The different in vivo and in vitro responses of B6.Sle2c2 leukocytes are consistent with the mutation in the G-CSFR having functional consequences. The elimination of Sle2c2 suppression of autoantibody production by exogenous G-CSF indicates that Sle2c2 corresponds to a loss of function of G-CSF receptor. This result was corroborated by the increased anti-dsDNA IgG production in G-CSF-treated B6.TC mice, which also carry the Sle2c2 locus. Overall, these results suggest that the G-CSF pathway regulates the production of autoantibodies in murine models of lupus.
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Inducible deletion of the Blimp-1 gene in adult epidermis causes granulocyte-dominated chronic skin inflammation in mice. Proc Natl Acad Sci U S A 2013; 110:6476-81. [PMID: 23576729 DOI: 10.1073/pnas.1219462110] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
B lymphocyte-induced maturation protein-1 (Blimp-1) is a transcriptional repressor important for the differentiation and function of several types of immune cells. Because skin serves as a physical barrier and acts as an immune sentinel, we investigated whether Blimp-1 is involved in epidermal immune function. We show that Blimp-1 expression is reduced in skin lesions of some human eczema samples and in stimulated primary keratinocytes. Epidermal-specific deletion of PR domain containing 1, with ZNF domain (Prdm1), the gene encoding Blimp-1, in adult mice caused spontaneously inflamed skin characterized by massive dermal infiltration of neutrophils/macrophages and development of chronic inflammation associated with higher levels of cytokines/chemokines, including granulocyte colony-stimulating factor (G-CSF), and enhanced myelopoiesis in bone marrow. Deletion of Prdm1 in the epidermis of adult mice also led to stronger inflammatory reactions in a tape-stripping test and in a disease model of contact dermatitis. The elevated G-CSF produced by keratinocytes after deletion of Prdm1 in vitro was mediated by the transcriptional activation of FBJ osteosarcoma oncogene (Fos) and fos-like antigen 1 (Fosl1). Systemic increases in G-CSF contributed to the inflammatory responses, because deletion of the G-CSF gene [colony stimulating factor 3, (Csf3)] prevented neutrophilia and partially ameliorated the inflamed skin in Prdm1-deficient mice. Our findings indicate a previously unreported function for Blimp-1 in restraining steady-state epidermal barrier immunity.
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Surveillance on the status of immune cells after Echinnococcus granulosus protoscoleces infection in Balb/c mice. PLoS One 2013; 8:e59746. [PMID: 23555767 PMCID: PMC3608569 DOI: 10.1371/journal.pone.0059746] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Accepted: 02/17/2013] [Indexed: 01/07/2023] Open
Abstract
Background Cystic echinococcosis is a global parasitic disease caused by infection with Echinococcus granulosus larvae with potentially life-threatening complications in humans. To date, the status of the immune cells believed to be associated with the pathogenicity of E. granulosus infection has not been demonstrated clearly. Methodology/Principal Findings In this study, we developed a multiplex flow cytometry assay to investigate the systemic immune status of innate and adaptive immunity at 30, 180, 360 days post-infection (dpi) in mice infected with E. granulousus. At 30 dpi, an increase in the number of CD11b+ and CD11c+ antigen-presenting cells (APCs) was observed. This was accompanied by the slight down-regulated expression of the co-stimulatory molecule MHC-II, indicating the impairment of APCs in early infection through the release of secretory-excretory products. In all infected groups, we observed a significant increase in innate immune cells, including APCs and GR-1+ cells, and a dramatic increase in the myeloid-derived suppressor cells (MDSC) expressing CD11b+/GR-1+. Moreover, the upregulation of the activated markers CD69, CD44, CD40L, and the downregulation of CD62L were observed in the CD4+ and CD8+ T cells following infection. Regulatory T cells expressing CD4+/CD25+/FoxP3+ increased significantly over the course of infection. Conclusions Our findings demonstrate that the microenvironment in the peripheral immune system after E. granulosus infection changes in subtle but detectably ways, especially during the persistent period of infection. We found that T cells were activated following infection, but observed that the significant increase of immunosuppressive cells such as MDSC and Treg cells could inhibit T cell response to E. granulosus antigens. We suggest these cells may play a neglected but key role in the downregulation of the immune response in long-term parasitic infection. Understanding the basic functions and temporal interactions of these immunosuppressive cells will pave the way for new strategies of parasite vaccine design.
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Nierhaus A, Klatte S, Linssen J, Eismann NM, Wichmann D, Hedke J, Braune SA, Kluge S. Revisiting the white blood cell count: immature granulocytes count as a diagnostic marker to discriminate between SIRS and sepsis--a prospective, observational study. BMC Immunol 2013; 14:8. [PMID: 23398965 PMCID: PMC3575223 DOI: 10.1186/1471-2172-14-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 02/05/2013] [Indexed: 01/20/2023] Open
Abstract
Background Sepsis is a serious disease condition and a major cause of intensive care unit (ICU) admission. Its diagnosis in critically ill patients is complicated. To diagnose an infection rapidly, and to accurately differentiate systemic inflammatory response syndrome (SIRS) from sepsis, is challenging yet early diagnosis is vital for early induction of an appropriate therapy. The aim of this study was to evaluate whether the immature granulocyte (IG) count is a useful early diagnostic marker of sepsis compared to other markers. Therefore, a total of 70 consecutive surgical intensive care patients were assessed. IGs were measured from whole blood samples using an automated analyzer. C-reactive protein (CRP), lipopolysaccharide binding protein (LBP) and interleukin-6 (IL-6) concentrations were also determined. The observation period was a maximum of 21 days and ended with the patients’ discharge from ICU or death. Receiver operating characteristic (ROC) analyses were conducted and area under the curve (AUC) was calculated to determine sensitivities and specificities for the parameters. Results We found that the IG count significantly discriminates between infected and non-infected patients (P < 0.0001) with a sensitivity of 89.2% and a specificity of 76.4%, particularly within the first 48 hours after SIRS onset. Regarding the discriminative power for infection, the IG count was more indicative than other clinical parameters such as CRP, LBP and IL-6, which had a sensitivity of less than 68%. Additionally, the highest diagnostic odds ratio (DOR) with 26.7 was calculated for the IG count within the first 48 hours. During the course of the disease ROC curve analyses showed a superior positive predictive value of the IG count compared to the other measured parameters during the first five days following the fulfillment of SIRS criteria. However, the number of IGs was not correlated with ICU mortality. Conclusions The total number of IG in peripheral blood from ICU patients is a good marker to discriminate infected and non-infected patients very early during SIRS. However, the IG count is not suitable as a prognostic marker for mortality. Routine and serial measurement of IGs may provide new possibilities for rapid screening of SIRS patients on ICU with suspected infections.
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Affiliation(s)
- Axel Nierhaus
- Department of Critical Care, University Medical Center Hamburg-Eppendorf, Martinistr, 52, Hamburg, 20246, Germany.
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Newman K, Maness-Harris L, El-Hemaidi I, Akhtari M. Revisiting use of growth factors in myelodysplastic syndromes. Asian Pac J Cancer Prev 2013; 13:1081-91. [PMID: 22799286 DOI: 10.7314/apjcp.2012.13.4.1081] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Myelodysplastic syndromes (MDS) represent a heterogeneous group of clonal hematologic neoplasms characterized by morphologic dysplasia, aberrant hematopoiesis and peripheral blood refractory cytopenias. MDS is recognized to be associated with an increased risk of symptomatic anemia, infectious complications and bleeding diathesis, as well as a risk of progression to acute myeloid leukemia, particularly in patients with a high IPSS score. The advent of use of hematopoietic growth factors such as granulocyte colony-stimulating factor (G-CSF) and recombinant erythropoietin (EPO) has improved symptoms in MDS patients in addition to some data that suggest there might be an improvement in survival. G-CSF is an effective therapeutic option in MDS patients, and it should be considered for the management of refractory symptomatic cytopenias. G-CSF and EPO in combination can improve outcomes in appropriate MDS patients such as those with lower-risk MDS and refractory anemia with ring sideroblasts (RARS) . This article reviews use of growth factors for lower-risk MDS patients, and examines the data for G-CSF, EPO and thrombopietic growth factors (TPO) that are available or being developed as therapeutic modalities for this challenging disease.
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Affiliation(s)
- Kam Newman
- Department of Internal Medicine, Jamaica Hospital Medical Center, Jamaica, NY, USA
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225
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Lu T, Kobayashi SD, Quinn MT, Deleo FR. A NET Outcome. Front Immunol 2012; 3:365. [PMID: 23227026 PMCID: PMC3514450 DOI: 10.3389/fimmu.2012.00365] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Accepted: 11/16/2012] [Indexed: 01/11/2023] Open
Abstract
Neutrophils constitute a critical part of innate immunity and are well known for their ability to phagocytose and kill invading microorganisms. The microbicidal processes employed by neutrophils are highly effective at killing most ingested bacteria and fungi. However, an alternative non-phagocytic antimicrobial mechanism of neutrophils has been proposed whereby microorganisms are eliminated by neutrophil extracellular traps (NETs). NETs are comprised of DNA, histones, and antimicrobial proteins extruded by neutrophils during NETosis, a cell death pathway reported to be distinct from apoptosis, phagocytosis-induced cell death, and necrosis. Although multiple laboratories have reported NETs using various stimuli in vitro, the molecular mechanisms involved in this process have yet to be definitively elucidated, and many questions regarding the formation and putative role or function of NETs in innate host defense remain unanswered. It is with these questions in mind that we provide some reflection and perspective on NETs and NETosis.
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Affiliation(s)
- Thea Lu
- Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health Hamilton, MT, USA
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226
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Sevko A, Umansky V. Myeloid-derived suppressor cells interact with tumors in terms of myelopoiesis, tumorigenesis and immunosuppression: thick as thieves. J Cancer 2012; 4:3-11. [PMID: 23386900 PMCID: PMC3564242 DOI: 10.7150/jca.5047] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Accepted: 11/20/2012] [Indexed: 12/20/2022] Open
Abstract
Tumor progression is often associated with chronic inflammation in the tumor microenvironment, which is mediated by numerous cytokines, chemokines and growth factors produced by cancer and stroma cells. All these mediators support tumor development and immunosuppression in autocrine and/or paracrine ways. Neutralization of chronic inflammatory conditions can lead to the restoration of anti-tumor immune responses. Among stroma cells infiltrating tumors, myeloid-derived suppressor cells (MDSCs) represent one of the most important players mediating immunosuppression. These cells may not only inhibit an anti-tumor immunity but also directly stimulate tumorigenesis as well as tumor growth and expansion. Therefore, understanding the mechanisms of generation, migration to the tumor site and activation of MDSC is necessary for the development of new strategies of tumor immunotherapy.
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Affiliation(s)
- Alexandra Sevko
- Skin Cancer Unit, German Cancer Research Center, Heidelberg and Department of Dermatology, Venereology and Allergology, University Medical Center Mannheim, Ruprecht-Karl University of Heidelberg, Mannheim, 69120 Heidelberg, Germany
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Ross EA, Coughlan RE, Flores-Langarica A, Lax S, Nicholson J, Desanti GE, Marshall JL, Bobat S, Hitchcock J, White A, Jenkinson WE, Khan M, Henderson IR, Lavery GG, Buckley CD, Anderson G, Cunningham AF. Thymic function is maintained during Salmonella-induced atrophy and recovery. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2012; 189:4266-74. [PMID: 22993205 PMCID: PMC3912538 DOI: 10.4049/jimmunol.1200070] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Thymic atrophy is a frequent consequence of infection with bacteria, viruses, and parasites and is considered a common virulence trait between pathogens. Multiple reasons have been proposed to explain this atrophy, including premature egress of immature thymocytes, increased apoptosis, or thymic shutdown to prevent tolerance to the pathogen from developing. The severe loss in thymic cell number can reflect an equally dramatic reduction in thymic output, potentially reducing peripheral T cell numbers. In this study, we examine the relationship between systemic Salmonella infection and thymic function. During infection, naive T cell numbers in peripheral lymphoid organs increase. Nevertheless, this occurs despite a pronounced thymic atrophy caused by viable bacteria, with a peak 50-fold reduction in thymocyte numbers. Thymic atrophy is not dependent upon homeostatic feedback from peripheral T cells or on regulation of endogenous glucocorticoids, as demonstrated by infection of genetically altered mice. Once bacterial numbers fall, thymocyte numbers recover, and this is associated with increases in the proportion and proliferation of early thymic progenitors. During atrophy, thymic T cell maturation is maintained, and single-joint TCR rearrangement excision circle analysis reveals there is only a modest fall in recent CD4(+) thymic emigrants in secondary lymphoid tissues. Thus, thymic atrophy does not necessarily result in a matching dysfunctional T cell output, and thymic homeostasis can constantly adjust to systemic infection to ensure that naive T cell output is maintained.
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Affiliation(s)
- Ewan A. Ross
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ruth E. Coughlan
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Adriana Flores-Langarica
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Sian Lax
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Julia Nicholson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Guillaume E. Desanti
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jennifer L. Marshall
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Saeeda Bobat
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jessica Hitchcock
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Andrea White
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - William E. Jenkinson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Mahmood Khan
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ian R. Henderson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Gareth G. Lavery
- Centre for Endocrinology, Diabetes and Metabolism, School of Clinical and Experimental Medicine, Institute for Biomedical Research, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Christopher D. Buckley
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Graham Anderson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Adam F. Cunningham
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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Bugl S, Wirths S, Müller MR, Radsak MP, Kopp HG. Current insights into neutrophil homeostasis. Ann N Y Acad Sci 2012; 1266:171-8. [PMID: 22901268 DOI: 10.1111/j.1749-6632.2012.06607.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Neutrophil granulocytes represent the first immunologic barrier against invading pathogens, and neutropenia predisposes to infection. However, neutrophils may also cause significant collateral inflammatory damage. Therefore, neutrophil numbers are tightly regulated by an incompletely understood homeostatic feedback loop adjusting the marrow's supply to peripheral needs. Granulocyte colony-stimulating factor (G-CSF) is accepted to be the major determinant of neutrophil production, and G-CSF levels have, soon after its discovery, been described to be inversely correlated with neutrophil counts. A neutrophil sensor, or "neutrostat," has, therefore, been postulated. The prevailing feedback hypothesis was established in adhesion molecule-deficient mice; it includes macrophages and Th17 cells, which determine G-CSF levels in response to the number of peripherally transmigrated, apoptosing neutrophils. Recent work has deepened our understanding of homeostatic regulation of neutrophil granulopoiesis, but there are still inconsistent findings and unresolved questions when it comes to a plausible hypothesis, similar to the feedback control models of red cell or platelet homeostasis.
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Affiliation(s)
- Stefanie Bugl
- Department of Medical Oncology, Hematology, Immunology, Rheumatology and Pulmology, University Hospital of Tübingen, Tübingen, Germany
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β-Glucan derived from Aureobasidium pullulans is effective for the prevention of influenza in mice. PLoS One 2012; 7:e41399. [PMID: 22844473 PMCID: PMC3402398 DOI: 10.1371/journal.pone.0041399] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Accepted: 06/21/2012] [Indexed: 12/11/2022] Open
Abstract
β-(1→3)-D-glucans with β-(1→6)-glycosidic linked branches produced by mushrooms, yeast and fungi are known to be an immune activation agent, and are used in anti-cancer drugs or health-promoting foods. In this report, we demonstrate that oral administration of Aureobasidium pullulans-cultured fluid (AP-CF) enriched with the β-(1→3),(1→6)-D-glucan exhibits efficacy to protect mice infected with a lethal titer of the A/Puerto Rico/8/34 (PR8; H1N1) strain of influenza virus. The survival rate of the mice significantly increased by AP-CF administration after sublethal infection of PR8 virus. The virus titer in the mouse lung homogenates was significantly decreased by AP-CF administration. No significant difference in the mRNA expression of inflammatory cytokines, and in the population of lymphocytes was observed in the lungs of mice administered with AP-CF. Interestingly, expression level for the mRNA of virus sensors, RIG-I (retinoic acid-inducible gene-I) and MDA5 (melanoma differentiation-associated protein 5) strongly increased at 5 hours after the stimulation of A. pullulans-produced purified β-(1→3),(1→6)-D-glucan (AP-BG) in murine macrophage-derived RAW264.7 cells. Furthermore, the replication of PR8 virus was significantly repressed by pre-treatment of AP-BG. These findings suggest the increased expression of virus sensors is effective for the prevention of influenza by the inhibition of viral replication with the administration of AP-CF.
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230
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Elevating body temperature enhances hematopoiesis and neutrophil recovery after total body irradiation in an IL-1-, IL-17-, and G-CSF-dependent manner. Blood 2012; 120:2600-9. [PMID: 22806894 DOI: 10.1182/blood-2012-02-409805] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Neutropenia is a common side effect of cytotoxic chemotherapy and radiation, increasing the risk of infection in these patients. Here we examined the impact of body temperature on neutrophil recovery in the blood and bone marrow after total body irradiation (TBI). Mice were exposed to either 3 or 6 Gy TBI followed by a mild heat treatment that temporarily raised core body temperature to approximately 39.5°C. Neutrophil recovery was then compared with control mice that received either TBI alone heat treatment alone. Mice that received both TBI and heat treatment exhibited a significant increase in the rate of neutrophil recovery in the blood and an increase in the number of marrow hematopoietic stem cells and neutrophil progenitors compared with that seen in mice that received either TBI or heat alone. The combination treatment also increased G-CSF concentrations in the serum, bone marrow, and intestinal tissue and IL-17, IL-1β, and IL-1α concentrations in the intestinal tissue after TBI. Neutralizing G-CSF or inhibiting IL-17 or IL-1 signaling significantly blocked the thermally mediated increase in neutrophil numbers. These findings suggest that a physiologically relevant increase in body temperature can accelerate recovery from neutropenia after TBI through a G-CSF-, IL-17-, and IL-1-dependent mechanism.
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231
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Gentile LF, Cuenca AG, Efron PA, Ang D, McKinley BA, Moldawer LL, Moore FA. Persistent inflammation and immunosuppression: a common syndrome and new horizon for surgical intensive care. J Trauma Acute Care Surg 2012; 72:1491-501. [PMID: 22695412 PMCID: PMC3705923 DOI: 10.1097/ta.0b013e318256e000] [Citation(s) in RCA: 512] [Impact Index Per Article: 42.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Surgical intensive care unit (ICU) stay of longer than 10 days is often described by the experienced intensivist as a "complicated clinical course" and is frequently attributed to persistent immune dysfunction. "Systemic inflammatory response syndrome" (SIRS) followed by "compensatory anti-inflammatory response syndrome" (CARS) is a conceptual framework to explain the immunologic trajectory that ICU patients with severe sepsis, trauma, or emergency surgery for abdominal infection often traverse, but the causes, mechanisms, and reasons for persistent immune dysfunction remain unexplained. Often involving multiple-organ failure (MOF) and death, improvements in surgical intensive care have altered its incidence, phenotype, and frequency and have increased the number of patients who survive initial sepsis or surgical events and progress to a persistent inflammation, immunosuppression, and catabolism syndrome (PICS). Often observed, but rarely reversible, these patients may survive to transfer to a long-term care facility only to return to the ICU, but rarely to self-sufficiency. We propose that PICS is the dominant pathophysiology and phenotype that has replaced late MOF and prolongs surgical ICU stay, usually with poor outcome. This review details the evolving epidemiology of MOF, the clinical presentation of PICS, and our understanding of how persistent inflammation and immunosuppression define the pathobiology of prolonged intensive care. Therapy for PICS will involve innovative interventions for immune system rebalance and nutritional support to regain physical function and well-being.
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Affiliation(s)
- Lori F. Gentile
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - Alex G. Cuenca
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - Philip A. Efron
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - Darwin Ang
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - Bruce A. McKinley
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - Lyle L. Moldawer
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
| | - Frederick A. Moore
- Department of Surgery, University of Florida College of Medicine, Gainesville, Florida
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Hudock KM, Liu Y, Mei J, Marino RC, Hale JE, Dai N, Worthen GS. Delayed resolution of lung inflammation in Il-1rn-/- mice reflects elevated IL-17A/granulocyte colony-stimulating factor expression. Am J Respir Cell Mol Biol 2012; 47:436-44. [PMID: 22592923 DOI: 10.1165/rcmb.2012-0104oc] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
IL-1 has been associated with acute lung injury (ALI) in both humans and animal models, but further investigation of the precise mechanisms involved is needed, and may identify novel therapeutic targets. To discover the IL-1 mediators essential to the initiation and resolution phases of acute lung inflammation, knockout mice (with targeted deletions for either the IL-1 receptor-1, i.e., Il-1r1(-/-), or the IL-1 receptor antagonist, i.e., Il-1rn(-/-)) were exposed to aerosolized LPS, and indices of lung and systemic inflammation were examined over the subsequent 48 hours. The resultant cell counts, histology, protein, and RNA expression of key cytokines were measured. Il-1r1(-/-) mice exhibited decreased neutrophil influx, particularly at 4 and 48 hours after exposure to LPS, as well as reduced bronchoalveolar lavage (BAL) expression of chemokines and granulocyte colony-stimulating factor (G-CSF). On the contrary, Il-1rn(-/-) mice demonstrated increased BAL neutrophil counts, increased BAL total protein, and greater evidence of histologic injury, all most notably 2 days after LPS exposure. Il-1rn(-/-) mice also exhibited higher peripheral neutrophil counts and greater numbers of granulocyte receptor-1 cells in their bone marrow, potentially reflecting their elevated plasma G-CSF concentrations. Furthermore, IL-17A expression was increased in the BAL and lungs of Il-1rn(-/-) mice after exposure to LPS, likely because of increased numbers of γδ T cells in the Il-1rn(-/-) lungs. Blockade with IL-17A monoclonal antibody before LPS exposure decreased the resultant BAL neutrophil counts and lung G-CSF expression in Il-1rn(-/-) mice, 48 hours after exposure to LPS. In conclusion, Il-1rn(-/-) mice exhibit delayed resolution in acute lung inflammation after exposure to LPS, a process that appears to be mediated via the G-CSF/IL-17A axis.
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Affiliation(s)
- Kristin M Hudock
- Division of Allergy, Pulmonary, and Critical Care Medicine, Department of Medicine, Pearlman School of Medicine, University of Pennsylvania, Abramson Research Building, Rm. 414E, 3615 Civic Center Blvd., Philadelphia, PA 19104, USA.
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Kamezaki Y, Katsuura S, Kuwano Y, Tanahashi T, Rokutan K. Circulating cytokine signatures in healthy medical students exposed to academic examination stress. Psychophysiology 2012; 49:991-7. [PMID: 22468981 DOI: 10.1111/j.1469-8986.2012.01371.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2011] [Accepted: 02/10/2012] [Indexed: 12/13/2022]
Abstract
Stress-induced production of proinflammatory cytokines in the brain and periphery is associated with mental distress. In this study, we measured changes in levels of salivary cortisol and 50 circulating immune mediators in 28 4th-grade medical students (19 males and 9 females) 7 weeks before, 1 day before, immediately after, and 1 week after an authorized nationwide examination for promotion. Repeated measures ANOVA with multiple testing correction and post hoc tests revealed that the examination significantly increased levels of proinflammatory cytokines (granulocyte colony-stimulating factor, interferon-γ, interleukin (IL)-1β, and tumor necrosis factor-α), Th2 cytokines (IL-4, IL-5, and IL-13), and β-nerve growth factor in association with significant decreases in salivary cortisol levels and anxiety after the examination. These mediators may have a negative impact on the mental state of healthy young adults exposed to naturalistic stressors.
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Affiliation(s)
- Yoshiko Kamezaki
- Department of Stress Science, Institute of Health Biosciences, The University of Tokushima Graduate School, Tokushima, Japan
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234
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Silvestris N, Del Re M, Azzariti A, Maiello E, Lombardi L, Cinieri S, Guarini A, Brunetti AE, Delcuratolo S, De Vita F, Pisconti S, Danesi R, Colucci G. Optimized granulocyte colony-stimulating factor prophylaxis in adult cancer patients: from biological principles to clinical guidelines. Expert Opin Ther Targets 2012; 16 Suppl 2:S111-7. [DOI: 10.1517/14728222.2011.652089] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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235
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Li J, McCormick J, Bocking A, Reid G. Importance of Vaginal Microbes in Reproductive Health. Reprod Sci 2012; 19:235-42. [DOI: 10.1177/1933719111418379] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Jingru Li
- Department of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada
| | - John McCormick
- Department of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada
- Canadian Research & Development Centre for Probiotics, Lawson Health Research Institute, London, Ontario, Canada
| | - Alan Bocking
- Department of Obstetrics and Gynecology, University of Toronto and Mt. Sinai Hospital, University Avenue, Toronto, Ontario, Canada
| | - Gregor Reid
- Department of Microbiology and Immunology, The University of Western Ontario, London, Ontario, Canada
- Canadian Research & Development Centre for Probiotics, Lawson Health Research Institute, London, Ontario, Canada
- Department of Surgery, The University of Western Ontario, London, Ontario, Canada
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236
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Hall C, Flores M, Oehlers S, Sanderson L, Lam E, Crosier K, Crosier P. Infection-Responsive Expansion of the Hematopoietic Stem and Progenitor Cell Compartment in Zebrafish Is Dependent upon Inducible Nitric Oxide. Cell Stem Cell 2012; 10:198-209. [DOI: 10.1016/j.stem.2012.01.007] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 12/10/2011] [Accepted: 01/17/2012] [Indexed: 01/10/2023]
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237
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Katzenback BA, Belosevic M. Characterization of granulocyte colony stimulating factor receptor of the goldfish (Carassius auratus L.). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2012; 36:199-207. [PMID: 21801744 DOI: 10.1016/j.dci.2011.07.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2011] [Revised: 07/11/2011] [Accepted: 07/12/2011] [Indexed: 05/31/2023]
Abstract
Granulocyte colony stimulating factor receptor (GCSFR) is a member of the class I cytokine receptor superfamily and signaling through this receptor is important for the proliferation, differentiation and activation of neutrophils and their precursors. In this study we report on the cloning and molecular characterization of goldfish GCSFR. The identified goldfish GCSFR sequence possesses the conserved Ig-like domain, the cytokine receptor homology domain (CRH), three fibronectin domains as well as several intracellular signaling motifs characteristic of other vertebrate GCSFRs. Goldfish gcsfr mRNA was highly expressed in kidney and spleen, and in primary kidney neutrophils. The neutrophils have significantly higher mRNA levels of the transcription factors pu.1 and cebpα, and down-regulated levels of transcription factors important for macrophage development such as egr1 and cjun, compared to progenitor cells from the kidney. The gcsfr mRNA was present in the kidney progenitor cells, albeit at much lower levels compared to the neutrophils, and the expression of gcsfr in progenitor cells was not affected by duration of cultivation. Furthermore, gcsfr mRNA levels were up-regulated in neutrophils after treatment with heat-killed Aeromonas salmonicida A449 or with mitogens. Our results indicate that GCSFR may be a useful marker for fish neutrophils.
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238
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Kreisel D, Sugimoto S, Zhu J, Nava R, Li W, Okazaki M, Yamamoto S, Ibrahim M, Huang HJ, Toth KA, Ritter JH, Krupnick AS, Miller MJ, Gelman AE. Emergency granulopoiesis promotes neutrophil-dendritic cell encounters that prevent mouse lung allograft acceptance. Blood 2011; 118:6172-82. [PMID: 21972291 PMCID: PMC3234670 DOI: 10.1182/blood-2011-04-347823] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Accepted: 09/18/2011] [Indexed: 12/16/2022] Open
Abstract
The mechanisms by which innate immune signals regulate alloimmune responses remain poorly understood. In the present study, we show by intravital 2-photon microscopy direct interactions between graft-infiltrating neutrophils and donor CD11c(+) dendritic cells (DCs) within orthotopic lung allografts immediately after reperfusion. Neutrophils isolated from the airways of lung transplantation recipients stimulate donor DCs in a contact-dependent fashion to augment their production of IL-12 and expand alloantigen-specific IFN-γ(+) T cells. DC IL-12 expression is largely regulated by degranulation and induced by TNF-α associated with the neutrophil plasma membrane. Extended cold ischemic graft storage enhances G-CSF-mediated granulopoiesis and neutrophil graft infiltration, resulting in exacerbation of ischemia-reperfusion injury after lung transplantation. Ischemia reperfusion injury prevents immunosuppression-mediated acceptance of mouse lung allografts unless G-CSF-mediated granulopoiesis is inhibited. Our findings identify granulopoiesis-mediated augmentation of alloimmunity as a novel link between innate and adaptive immune responses after organ transplantation.
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Affiliation(s)
- Daniel Kreisel
- Department of Surgery, Washington University School of Medicine, St Louis, MO 63110, USA
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239
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Waight JD, Hu Q, Miller A, Liu S, Abrams SI. Tumor-derived G-CSF facilitates neoplastic growth through a granulocytic myeloid-derived suppressor cell-dependent mechanism. PLoS One 2011; 6:e27690. [PMID: 22110722 PMCID: PMC3218014 DOI: 10.1371/journal.pone.0027690] [Citation(s) in RCA: 187] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Accepted: 10/23/2011] [Indexed: 12/22/2022] Open
Abstract
Myeloid-derived suppressor cells (MDSC) are induced under diverse pathologic conditions, including neoplasia, and suppress innate and adaptive immunity. While the mechanisms by which MDSC mediate immunosuppression are well-characterized, details on how they develop remain less understood. This is complicated further by the fact that MDSC comprise multiple myeloid cell types, namely monocytes and granulocytes, reflecting diverse stages of differentiation and the proportion of these subpopulations vary among different neoplastic models. Thus, it is thought that the type and quantities of inflammatory mediators generated during neoplasia dictate the composition of the resultant MDSC response. Although much interest has been devoted to monocytic MDSC biology, a fundamental gap remains in our understanding of the derivation of granulocytic MDSC. In settings of heightened granulocytic MDSC responses, we hypothesized that inappropriate production of G-CSF is a key initiator of granulocytic MDSC accumulation. We observed abundant amounts of G-CSF in vivo, which correlated with robust granulocytic MDSC responses in multiple tumor models. Using G-CSF loss- and gain-of-function approaches, we demonstrated for the first time that: 1) abrogating G-CSF production significantly diminished granulocytic MDSC accumulation and tumor growth; 2) ectopically over-expressing G-CSF in G-CSF-negative tumors significantly augmented granulocytic MDSC accumulation and tumor growth; and 3) treatment of naïve healthy mice with recombinant G-CSF protein elicited granulocytic-like MDSC remarkably similar to those induced under tumor-bearing conditions. Collectively, we demonstrated that tumor-derived G-CSF enhances tumor growth through granulocytic MDSC-dependent mechanisms. These findings provide us with novel insights into MDSC subset development and potentially new biomarkers or targets for cancer therapy.
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Affiliation(s)
- Jeremy D. Waight
- Department of Immunology, Roswell Park Cancer Institute, Buffalo, New York, United States of America
| | - Qiang Hu
- Department of Biostatistics, Roswell Park Cancer Institute, Buffalo, New York, United States of America
| | - Austin Miller
- Department of Biostatistics, Roswell Park Cancer Institute, Buffalo, New York, United States of America
| | - Song Liu
- Department of Biostatistics, Roswell Park Cancer Institute, Buffalo, New York, United States of America
| | - Scott I. Abrams
- Department of Immunology, Roswell Park Cancer Institute, Buffalo, New York, United States of America
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240
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Rigby KM, DeLeo FR. Neutrophils in innate host defense against Staphylococcus aureus infections. Semin Immunopathol 2011; 34:237-59. [PMID: 22080185 PMCID: PMC3271231 DOI: 10.1007/s00281-011-0295-3] [Citation(s) in RCA: 260] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Accepted: 10/14/2011] [Indexed: 12/29/2022]
Abstract
Staphylococcus aureus has been an important human pathogen throughout history and is currently a leading cause of bacterial infections worldwide. S. aureus has the unique ability to cause a continuum of diseases, ranging from minor skin infections to fatal necrotizing pneumonia. Moreover, the emergence of highly virulent, drug-resistant strains such as methicillin-resistant S. aureus in both healthcare and community settings is a major therapeutic concern. Neutrophils are the most prominent cellular component of the innate immune system and provide an essential primary defense against bacterial pathogens such as S. aureus. Neutrophils are rapidly recruited to sites of infection where they bind and ingest invading S. aureus, and this process triggers potent oxidative and non-oxidative antimicrobial killing mechanisms that serve to limit pathogen survival and dissemination. S. aureus has evolved numerous mechanisms to evade host defense strategies employed by neutrophils, including the ability to modulate normal neutrophil turnover, a process critical to the resolution of acute inflammation. Here we provide an overview of the role of neutrophils in host defense against bacterial pathogens and discuss strategies employed by S. aureus to circumvent neutrophil function.
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Affiliation(s)
- Kevin M Rigby
- Laboratory of Human Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 903 South 4th Street, Hamilton, MT 59840, USA
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241
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Bone marrow dendritic cell progenitors sense pathogens via Toll-like receptors and subsequently migrate to inflamed lymph nodes. Blood 2011; 118:4829-40. [DOI: 10.1182/blood-2011-03-344960] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Abstract
Common dendritic cell progenitors (CDPs) in the bone marrow (BM) regenerate dendritic cells (DCs) in lymphoid and nonlymphoid tissues. How the dissemination of progenitor-derived DCs to peripheral tissues is regulated on need remains elusive. Microbes are sensed by pathogen recognition receptors such as Toll-like receptors (TLRs). We found that CDPs in the BM express TLR2, TLR4, and TLR9. On TLR stimulation, CDPs down-regulated CXCR4, the nonredundant chemokine receptor for their BM retention, up-regulated CCR7, and migrated to lymph nodes (LNs). When TLR agonists were injected locally, CDPs preferentially gave rise to DCs in inflamed LNs in expense of noninflamed LNs and the BM, but they did not alter their lineage differentiation and proliferative activity. Consequently, BM DC progenitors can sense TLR agonists and, via regulation of CXCR4 and CCR7, support the replenishment of DCs in reactive LNs. This mechanism likely developed to support DC homeostasis on specific need at sites of inflammation.
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242
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Teng EC, Racioppi L, Means AR. A cell-intrinsic role for CaMKK2 in granulocyte lineage commitment and differentiation. J Leukoc Biol 2011; 90:897-909. [PMID: 21816924 PMCID: PMC3206468 DOI: 10.1189/jlb.0311152] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2011] [Revised: 06/28/2011] [Accepted: 07/19/2011] [Indexed: 11/24/2022] Open
Abstract
Granulocytes serve a critical function in host organisms by recognizing and destroying invading microbes, as well as propagating and maintaining inflammation at sites of infection. However, the molecular pathways underpinning the development of granulocytes are poorly understood. Here, we identify a role for CaMKK2 in the restriction of granulocytic fate commitment and differentiation of myeloid progenitor cells. Following BMT, engraftment by Camkk2(-/-) donor cells resulted in the increased production of mature granulocytes in the BM and peripheral blood. Similarly, Camkk2(-/-) mice possessed elevated numbers of CMP cells and exhibited an accelerated granulopoietic phenotype in the BM. Camkk2(-/-) myeloid progenitors expressed increased levels of C/EBPα and PU.1 and preferentially differentiated into Gr1(+)Mac1(+) granulocytes and CFU-G in vitro. During normal granulopoiesis in vivo or G-CSF-induced differentiation of 32D myeloblast cells in vitro, CaMKK2 mRNA and protein were decreased as a function of time and were undetectable in mature granulocytes. Expression of ectopic CaMKK2 in Camkk2(-/-) CMPs was sufficient to rescue aberrant granulocyte differentiation and when overexpressed in 32D cells, was also sufficient to impede granulocyte differentiation in a kinase activity-dependent manner. Collectively, our results reveal a novel role for CaMKK2 as an inhibitor of granulocytic fate commitment and differentiation in early myeloid progenitors.
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Affiliation(s)
- Ellen C. Teng
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina, USA; and
| | - Luigi Racioppi
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina, USA; and
- Department of Cellular and Molecular Biology and Pathology, University of Naples Federico II, Naples, Italy
| | - Anthony R. Means
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina, USA; and
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243
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Galli SJ, Borregaard N, Wynn TA. Phenotypic and functional plasticity of cells of innate immunity: macrophages, mast cells and neutrophils. Nat Immunol 2011; 12:1035-44. [PMID: 22012443 PMCID: PMC3412172 DOI: 10.1038/ni.2109] [Citation(s) in RCA: 738] [Impact Index Per Article: 56.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hematopoietic cells, including lymphoid and myeloid cells, can develop into phenotypically distinct 'subpopulations' with different functions. However, evidence indicates that some of these subpopulations can manifest substantial plasticity (that is, undergo changes in their phenotype and function). Here we focus on the occurrence of phenotypically distinct subpopulations in three lineages of myeloid cells with important roles in innate and acquired immunity: macrophages, mast cells and neutrophils. Cytokine signals, epigenetic modifications and other microenvironmental factors can substantially and, in some cases, rapidly and reversibly alter the phenotype of these cells and influence their function. This suggests that regulation of the phenotype and function of differentiated hematopoietic cells by microenvironmental factors, including those generated during immune responses, represents a common mechanism for modulating innate or adaptive immunity.
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Affiliation(s)
- Stephen J Galli
- Department of Pathology, Stanford University School of Medicine, Stanford, California, USA.
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244
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Lang R, Schoenen H, Desel C. Targeting Syk-Card9-activating C-type lectin receptors by vaccine adjuvants: findings, implications and open questions. Immunobiology 2011; 216:1184-91. [PMID: 21742403 DOI: 10.1016/j.imbio.2011.06.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2011] [Accepted: 06/13/2011] [Indexed: 12/19/2022]
Abstract
Pathogen recognition by the innate immune system is essential for the induction of adaptive T cell responses. A diverse range of pathogen-associated molecular patterns (PAMPs) are recognized by a variety of pathogen recognition receptors (PRRs). Among these are the well known Toll-like receptors (TLR) and the more recently described C-type lectin receptors (CLR) which utilize distinct signaling pathways leading to a diverse repertoire of effector molecules produced. The composition of the inflammatory juice released from activated innate immune cells has a major impact on the polarization of Th cell responses. Defined PAMPs may therefore be used as adjuvants to direct adaptive immune responses to subunit vaccines. Targeting CLR is an alternative or complementary strategy to TLR-triggering adjuvants that will benefit the development of more efficient subunit vaccines for prevention of major human infectious diseases. In this short review, we discuss the potential of CLRs activating APC via the Syk-Card9 pathway as receptors for adjuvants that direct the development of robust Th17 and Th1 responses to subunit vaccines.
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Affiliation(s)
- Roland Lang
- Institute of Clinical Microbiology, Immunology and Hygiene, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Wasserturmstr. 3-5, 91054 Erlangen, Germany.
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245
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Jiang Y, Jiang W, Qiu Y, Dai W. Effect of a structurally modified human granulocyte colony stimulating factor, G-CSFa, on leukopenia in mice and monkeys. J Hematol Oncol 2011; 4:28. [PMID: 21668998 PMCID: PMC3130716 DOI: 10.1186/1756-8722-4-28] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 06/13/2011] [Indexed: 11/13/2022] Open
Abstract
Background Granulocyte colony stimulating factor (G-CSF) regulates survival, proliferation, and differentiation of neutrophilic granulocyte precursors, Recombinant G-CSF has been used for the treatment of congenital and therapy-induced neutropenia and stem cell mobilization. Due to its intrinsic instability, recombinant G-CSF needs to be excessively and/or frequently administered to patients in order to maintain a plasma concentration high enough to achieve therapeutic effects. Therefore, there is a need for the development of G-CSF derivatives that are more stable and active in vivo. Methods Using site-direct mutagenesis and recombinant DNA technology, a structurally modified derivative of human G-CSF termed G-CSFa was obtained. G-CSFa contains alanine 17 (instead of cysteine 17 as in wild-type G-CSF) as well as four additional amino acids including methionine, arginine, glycine, and serine at the amino-terminus. Purified recombinant G-CSFa was tested for its in vitro activity using cell-based assays and in vivo activity using both murine and primate animal models. Results In vitro studies demonstrated that G-CSFa, expressed in and purified from E. coli, induced a much higher proliferation rate than that of wild-type G-CSF at the same concentrations. In vivo studies showed that G-CSFa significantly increased the number of peripheral blood leukocytes in cesium-137 irradiated mice or monkeys with neutropenia after administration of clyclophosphamide. In addition, G-CSFa increased neutrophil counts to a higher level in monkeys with a concomitant slower declining rate than that of G-CSF, indicating a longer half-life of G-CSFa. Bone marrow smear analysis also confirmed that G-CSFa was more potent than G-CSF in the induction of granulopoiesis in bone marrows of myelo-suppressed monkeys. Conclusion G-CSFa, a structurally modified form of G-CSF, is more potent in stimulating proliferation and differentiation of myeloid cells of the granulocytic lineage than the wild-type counterpart both in vitro and in vivo. G-CSFa can be explored for the development of a new generation of recombinant therapeutic drug for leukopenia.
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246
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Serum Markers in Acute Appendicitis. J Surg Res 2011; 168:70-5. [DOI: 10.1016/j.jss.2009.10.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Revised: 09/01/2009] [Accepted: 10/19/2009] [Indexed: 12/22/2022]
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247
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Cain DW, Snowden PB, Sempowski GD, Kelsoe G. Inflammation triggers emergency granulopoiesis through a density-dependent feedback mechanism. PLoS One 2011; 6:e19957. [PMID: 21655273 PMCID: PMC3104996 DOI: 10.1371/journal.pone.0019957] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Accepted: 04/17/2011] [Indexed: 12/17/2022] Open
Abstract
Normally, neutrophil pools are maintained by homeostatic mechanisms that require
the transcription factor C/EBPα. Inflammation, however, induces neutrophilia
through a distinct pathway of “emergency” granulopoiesis that is
dependent on C/EBPβ. Here, we show in mice that alum triggers emergency
granulopoiesis through the IL-1RI-dependent induction of G-CSF. G-CSF/G-CSF-R
neutralization impairs proliferative responses of hematopoietic stem and
progenitor cells (HSPC) to alum, but also abrogates the acute mobilization of BM
neutrophils, raising the possibility that HSPC responses to inflammation are an
indirect result of the exhaustion of BM neutrophil stores. The induction of
neutropenia, via depletion with Gr-1 mAb or myeloid-specific ablation of Mcl-1,
elicits G-CSF via an IL-1RI-independent pathway, stimulating granulopoietic
responses indistinguishable from those induced by adjuvant. Notably, C/EBPβ,
thought to be necessary for enhanced generative capacity of BM, is dispensable
for increased proliferation of HSPC to alum or neutropenia, but plays a role in
terminal neutrophil differentiation during granulopoietic recovery. We conclude
that alum elicits a transient increase in G-CSF production via IL-1RI for the
mobilization of BM neutrophils, but density-dependent feedback sustains G-CSF
for accelerated granulopoiesis.
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Affiliation(s)
- Derek W. Cain
- Department of Immunology, Duke University,
Durham, North Carolina, United States of America
| | - Pilar B. Snowden
- Department of Immunology, Duke University,
Durham, North Carolina, United States of America
| | - Gregory D. Sempowski
- Duke University Human Vaccine Institute, Duke
University Medical Center, Durham, North Carolina, United States of
America
| | - Garnett Kelsoe
- Department of Immunology, Duke University,
Durham, North Carolina, United States of America
- * E-mail:
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249
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Katzenback BA, Karpman M, Belosevic M. Distribution and expression analysis of transcription factors in tissues and progenitor cell populations of the goldfish (Carassius auratus L.) in response to growth factors and pathogens. Mol Immunol 2011; 48:1224-35. [DOI: 10.1016/j.molimm.2011.03.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 03/01/2011] [Accepted: 03/08/2011] [Indexed: 12/16/2022]
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250
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Chen CW, Sowden M, Zhao Q, Wiedmer T, Sims PJ. Nuclear phospholipid scramblase 1 prolongs the mitotic expansion of granulocyte precursors during G-CSF-induced granulopoiesis. J Leukoc Biol 2011; 90:221-33. [PMID: 21447647 DOI: 10.1189/jlb.0111006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
PLSCR1-/- mice exhibit normal, steady-state hematologic parameters but impaired emergency granulopoiesis upon in vivo administration of G-CSF. The mechanism by which PLSCR1 contributes to G-CSF-induced neutrophil production is largely unknown. We now report that the expansion of bone marrow myelocytes upon in vivo G-CSF treatment is reduced in PLSCR1-/- mice relative to WT. Using SCF-ER-Hoxb8-immortalized myeloid progenitors to examine the progression of G-CSF-driven granulocytic differentiation in vitro, we found that PLSCR1 prolongs the period of mitotic expansion of proliferative granulocyte precursors, thereby giving rise to increased neutrophil production from their progenitors. This effect of PLSCR1 is blocked by a ΔNLS-PLSCR1, which prevents its nuclear import. By contrast, mutation that prevents the membrane association of PLSCR1 has minimal impact on the role of PLSCR1 in G-CSF-induced granulopoiesis. These data imply that the capacity of PLSCR1 to augment G-CSF-dependent production of mature neutrophils from myeloid progenitors is unrelated to its reported activities at the endofacial surface of the plasma membrane but does require entry of the protein into the nucleus, suggesting that this response is mediated through the observed effects of PLSCR1 on gene transcription.
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Affiliation(s)
- Chun-Wei Chen
- Department of Pathology and Laboratory Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
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