Thematische Bibliographien / Emergency granulopoiesis

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Auswahl der wissenschaftlichen Literatur zum Thema „Emergency granulopoiesis“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "Emergency granulopoiesis"

Manz, Markus G., und Steffen Boettcher. „Emergency granulopoiesis“. Nature Reviews Immunology 14, Nr. 5 (22.04.2014): 302–14. http://dx.doi.org/10.1038/nri3660.

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Redell, Michele, S. Wen-Wen Chen, Marcos J. Ruiz und David J. Tweardy. „Stat3β Promotes Basal Granulopoiesis and Inhibits Emergency Granulopoiesis, While Stat3α Inhibits Basal Granulopoiesis and Promotes Emergency Granulopoiesis“. Blood 112, Nr. 11 (16.11.2008): 3871. http://dx.doi.org/10.1182/blood.v112.11.3871.3871.

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Abstract Signal transducer and activator of transcription 3 (Stat3) is a key signaling intermediate that is activated by several cytokines that regulate hematopoiesis, including granulocyte-colony stimulating factor (G-CSF), interleukin 6, and stem cell factor (SCF). Studies using mice with Stat3 deletion targeted to hematopoietic cells have shown that Stat3 negatively regulates basal granulopoiesis but positively regulates emergency granulopoiesis. Stat3 also has been reported to promote B lymphocyte differentiation. Defining the hematopoietic functions of Stat3 is further complicated by the existence of two isoforms: full-length Stat3α (p92), and truncated Stat3β (p83). Stat3β is derived from alternative mRNA splicing resulting in replacement of the C-terminal transactivation domain with 7 unique amino acids (CT7), which have been demonstrated to confer markedly prolonged nuclear retention. Homozygous Stat3α-deficient mice are not viable, whereas Stat3β-deficient mice survive to adulthood and are fertile, but have increased inflammatory responses compared to wild-type mice. We compared basal granulopoiesis and lymphopoiesis, as well as emergency granulopoiesis, in homozygous Stat3β-deficient mice (βΔ/βΔ), which express only Stat3α, vs. their wild-type (+/+) littermates. We found that βΔ/βΔ mice were significantly leukopenic (2880 ± 1260/ml v. 4600 ± 1670/ml; p<0.05), with lower absolute neutrophil counts (ANC, 360 ± 180/ml v. 800 ± 380/ml, p<0.05) and B lymphocyte counts (780 ± 470/ml v. 1830 ± 1260/ml, p<0.05), compared to +/+ mice. Within the circulating B-lymphocyte population, the mature B220hi/IgM− cells were most dramatically reduced (170 ± 70/ml v. 480 ± 350/ml, p<0.05). Percentages of myeloid and lymphoid cells in the spleen and bone marrow were not significantly different between βΔ/βΔ and +/+ mice. Bone marrow from βΔ/βΔ mice generated significantly fewer myeloid colonies (CFU-GM) compared to wild-type marrow (28 ± 9 v. 42 ± 8 colonies per 20,000 cells, p<0.05). Additionally, βΔ/βΔ lineage-depleted bone marrow cells cultured in G-CSF and SCF produced significantly fewer CD11b+/Gr1+ myeloid cells compared to +/+ cells (52.8 ± 6.5% v. 68.3 ± 2.6%, p<0.05). In contrast, bone marrow from βΔ/βΔ and +/+ mice produced equal numbers of pro-B colonies in CFU assays containing the lymphopoietic cytokine IL-7. Finally, as a test of emergency granulopoiesis, we administered a single dose of G-CSF (250 μg/kg subcutaneously) or an equal volume of PBS, and 24 hr later measured the ANC, percentage of CD11b+/Gr1+ myeloid cells in the bone marrow, and CFU-GM generation. Mice of both genotypes responded to G-CSF stimulation with increases in ANC, percent of myeloid cells within the marrow, and CFU-GM. Bone marrow from βΔ/βΔ mice showed a larger G-CSF-induced increase in CFU-GM (PBS: 22 ± 5 v. G-CSF: 39 ± 1, p<0.05) compared to +/+ marrow (PBS: 24 ± 14 v. G-CSF: 31 ± 14, NS). Thus, Stat3β positively regulates basal granulopoiesis in the bone marrow, and may negatively regulate emergency granulopoiesis. This pattern is the opposite of that seen with deletion of both Stat3 isoforms, indicating that Stat3α’s function is to negatively regulate basal granulopoiesis and positively regulate emergency granulopoiesis. Stat3β also positively regulates circulating B lymphocyte numbers, via a mechanism other than B lymphocyte production in the bone marrow.

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Wirths, Stefan, Stefanie Bugl, Markus P. Radsak, Melanie Märklin, Martin R. Müller, Lothar Kanz und Hans-Georg Kopp. „Bone Marrow Derived Mesenchymal Cells Secrete Granulopoietic Cytokines upon Danger Signaling“. Blood 124, Nr. 21 (06.12.2014): 4115. http://dx.doi.org/10.1182/blood.v124.21.4115.4115.

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Abstract Granulopoietic homeostasis is regulated at steady-state to supply sufficient numbers of pooled and circulating neutrophils to maintain barrier function against commensal flora. In addition, upon pathogenic microbial challenge, an increased formation of neutrophils is induced, termed ‘emergency granulopoiesis’. Antibody-mediated reduction of neutrophil numbers in steady-state induces a feedback loop leading to an increase of bone marrow granulopoiesis with expansion of hematopoetic stem and progenitor cells. This feedback loop was demonstrated to depend on TLR4 and TRIF, but not MyD88 signaling (Bugl et al. Blood 2013). In contrast, emergency granulopoiesis was shown to be dependent on MyD88 signaling in endothelial cells (Boettcher et al. Blood 2014). Bone marrow mesenchymal stromal cells (MSC) are niche-forming cells, harboring and regulating hematopoiesis. Upon steady-state neutropenia an increase of niche size was observed. Here we investigated, whether niche-forming MSC act as sensors of pathogen-associated molecular patterns (PAMPs) and induce granulopoietic cytokines to stimulate expansion of adjacent hematopoietic stem and progenitor cells. MSC of C57BL/6 and TLR4-KO mice were cultured in vitro and treated with LPS for 24 hours. Cells were harvested and qRT-PCR for G-CSF, TLR4, MyD88, TRIF, GM-CSF, IL-1β, IL-18 and Casp-1 was performed After treatment with LPS, RNA of granulopoietic cytokines G-CSF and GM-CSF were massively up regulated in MSC of WT mice. Upstream regulating, inflammasome components IL-1ß and caspase-1 RNA levels increased as well, with little changes in IL-18, TLR4, MyD88 and TRIF. Unexpectedly, TLR4-KO MSC up regulated transcription of IL-1β and G-CSF upon LPS stimulation as well, and caspase-1 was found to be strongly up-regulated in unstimulated TLR4-KO compared to WT MSC. In summary, bone marrow stromal cells are found to be PAMP-sensing and secrete cytokines that regulate granulopoiesis. TLR4-independent sensing of LPS by MSC might correspond to the alternative noncanonical inflammasome pathway recently described (Kayagaki et al. Science 2013). Disclosures No relevant conflicts of interest to declare.

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Hu, Liping, Weiqi Huang, Ling Bei, Larisa Broglie und Elizabeth A. Eklund. „TP53Haploinsufficiency Rescues Emergency Granulopoiesis inFANCC−/−Mice“. Journal of Immunology 200, Nr. 6 (02.02.2018): 2129–39. http://dx.doi.org/10.4049/jimmunol.1700931.

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Zhang, Huiyuan, Hoainam Nguyen-Jackson, Athanasia D. Panopoulos, Haiyan S. Li, Peter J. Murray und Stephanie S. Watowich. „STAT3 controls myeloid progenitor growth during emergency granulopoiesis“. Blood 116, Nr. 14 (07.10.2010): 2462–71. http://dx.doi.org/10.1182/blood-2009-12-259630.

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Abstract Granulocyte colony-stimulating factor (G-CSF) mediates “emergency” granulopoiesis during infection, a process that is mimicked by clinical G-CSF use, yet we understand little about the intracellular signaling cascades that control demand-driven neutrophil production. Using a murine model with conditional deletion of signal transducer and activator of transcription 3 (STAT3) in bone marrow, we investigated the cellular and molecular mechanisms of STAT3 function in the emergency granulopoiesis response to G-CSF administration or infection with Listeria monocytogenes, a pathogen that is restrained by G-CSF signaling in vivo. Our results show that STAT3 deficiency renders hematopoietic progenitor cells and myeloid precursors refractory to the growth-promoting functions of G-CSF or L monocytogenes infection. STAT3 is necessary for accelerating granulocyte cell-cycle progression and maturation in response to G-CSF. STAT3 directly controls G-CSF–dependent expression of CCAAT-enhancer-binding protein β (C/EBPβ), a crucial factor in the emergency granulopoiesis response. Moreover, STAT3 and C/EBPβ coregulate c-Myc through interactions with the c-myc promoter that control the duration of C/EBPα occupancy during demand-driven granulopoiesis. These results place STAT3 as an essential mediator of emergency granulopoiesis by its regulation of transcription factors that direct G-CSF–responsive myeloid progenitor expansion.

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Wang, Hao, Chirag A. Shah, Liping Hu, Weiqi Huang, Leonidas C. Platanias und Elizabeth A. Eklund. „An aberrantly sustained emergency granulopoiesis response accelerates postchemotherapy relapse in MLL1-rearranged acute myeloid leukemia in mice“. Journal of Biological Chemistry 295, Nr. 28 (28.05.2020): 9663–75. http://dx.doi.org/10.1074/jbc.ra120.013206.

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Acute myeloid leukemia (AML) with mixed lineage leukemia 1 (MLL1) gene rearrangement is characterized by increased expression of a set of homeodomain transcription factors, including homeobox A9 (HOXA9) and HOXA10. The target genes for these regulators include fibroblast growth factor 2 (FGF2) and Ariadne RBR E3 ubiquitin ligase 2 (ARIH2). FGF2 induces leukemia stem cell expansion in MLL1-rearranged AML. ARIH2 encodes TRIAD1, an E3 ubiquitin ligase required for termination of emergency granulopoiesis and leukemia suppressor function in MLL1-rearranged AML. Receptor tyrosine kinases (RTKs), including the FGF receptor, are TRIAD1 substrates that are possibly relevant to these activities. Using transcriptome analysis, we found increased activity of innate immune response pathways and RTK signaling in bone marrow progenitors from mice with MLL1-rearranged AML. We hypothesized that sustained RTK signaling, because of decreased TRIAD1 activity, impairs termination of emergency granulopoiesis during the innate immune response and contributes to leukemogenesis in this AML subtype. Consistent with this, we found aberrantly sustained emergency granulopoiesis in a murine model of MLL1-rearranged AML, associated with accelerated leukemogenesis. Treating these mice with an inhibitor of TRIAD1-substrate RTKs terminated emergency granulopoiesis, delayed leukemogenesis during emergency granulopoiesis, and normalized innate immune responses when combined with chemotherapy. Emergency granulopoiesis also hastened postchemotherapy relapse in mice with MLL1-rearranged AML, but remission was sustained by ongoing RTK inhibition. Our findings suggest that the physiological stress of infectious challenges may drive AML progression in molecularly defined subsets and identify RTK inhibition as a potential therapeutic approach to counteract this process.

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Tamura, Akihiro, Hideyo Hirai, Yoshihiro Hayashi, Hisayuki Yao, Satoshi Yoshioka, Yasuo Miura, Eishi Ashihara und Taira Maekawa. „C/EBPβ-Mediated Expansion of Hematopoietic Stem/Progenitors Precedes ‘Emergency’ Granulopoiesis Induced by Candidemia.“ Blood 120, Nr. 21 (16.11.2012): 2336. http://dx.doi.org/10.1182/blood.v120.21.2336.2336.

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Abstract Abstract 2336 Granulopoiesis, the process of granulocyte production in the bone marrow (BM), is tightly regulated to meet host demands during both 'steady state' and 'emergency' situations such as infections. The transcription factor CCAAT/Enhancer Binding Protein β (C/EBPβ) plays critical roles in emergency granulopoiesis (Hirai et al. Nat Immunology, 2006). However, the precise developmental stages in which C/EBPβ is required are unknown. In this study, we investigated the roles of C/EBPβ in the proliferation and differentiation of prospectively identified intermediates between hematopoietic stem cells and mature granulocytes in mouse BM. In order to analyze the mouse BM cells undergoing granulopoiesis, novel flow cytometric method was developed. Mouse BM cells retaining the ability to give rise to granulocytes were dissected into five distinct subpopulations (#1–#5) according to their levels of c-kit and Ly-6G expression. Upon infection of Candida albicans (4 × 106 CFU/20 g body weight/mouse) on day 1, C/EBPβ was upregulated at the protein level but not at mRNA level in all the granulopoietic subpopulations, suggesting the importance of the transcription factor in □emergency' granulopoiesis. Then, the role of C/EBPβ was further assessed by analyzing C/EBPβ knockout (KO) mice. At steady state, the distribution of granulopoietic cells in BM of C/EBPβ KO mice at □esteady state' was identical to that of wild type (WT) mice. In contrast, the rapid increase in immature subpopulations #1 and #2 observed in WT mice at 1 day post-infection was significantly attenuated in C/EBPβ KO mice. The levels of mRNA expression for granule proteins (cathepsin G, myeloperoxidase, elastase 2, proteinase 3, lactoferrin and MMP9) within each subpopulation from WT and C/EBPβ KO mice were identical at both steady state and during infection. When the cell cycle status of these models was evaluated using in vivo BrdU labeling experiments, incorporation of BrdU in subpopulation #1 and #2 in C/EBPβ KO mice was always slightly lower than in WT mice, but the differences were not statistically significant. These findings suggest that C/EBPβ is required for efficient proliferation of early granulocytic precursors but not directly involved in the differentiation/maturation process. To elucidate the roles of C/EBPβ in the proliferation of the early granulopoietic subpopulations, the hematopoietic stem cells (HSCs) and myeloid progenitor compartments were analyzed in WT and C/EBPβ KO mice. The frequency and number of c-kit+ Sca-1+ lineage markers− HSC were identical between WT mice and C/EBPβ KO mice during the steady state, and were not significantly affected on day 1 post-infection. Induction of candidemia increased the frequency and number of granulocyte-macrophage progenitors (GMP) in WT mice, and these increases were significantly attenuated in C/EBPβ KO mice. Upon induction of candidemia, the frequency of BrdU-positive cells in the HSC and common myeloid progenitors (CMP) populations from WT mice increased significantly; however, an increase of BrdU-positive cells was observed only within the HSC compartment in C/EBPβ KO mice, and at a lower level than that in WT mice Taken together, these data suggest that the proliferation of early granulocytic precursors is tightly coupled to differentiation/maturation and that C/EBPβ is involved in the efficient amplification of early granulocyte precursors including HSC and myeloid progenitors during candidemia-induced 'emergency' granulopoiesis. Disclosures: No relevant conflicts of interest to declare.

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Satake, Sakiko, Hideyo Hirai, Nobuaki Shime, Rina Nagao, Ruriko Tanaka, Hisayuki Yao, Yoshihiro Hayashi et al. „Candidemia-Induced Emergency Granulopoiesis Consists of Successive Dual Waves Triggered by the Shift From C/EBPalpha to C/EBPbeta Dependency.“ Blood 116, Nr. 21 (19.11.2010): 3778. http://dx.doi.org/10.1182/blood.v116.21.3778.3778.

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Abstract Abstract 3778 Introduction: Granulocyte is a major cellular component in the front line of host defense. The number of granulocytes must be tightly tuned to meet the demand, because both the shortage and the excess of granulocytes can be harmful to the host. During emergency situations such as infections, granulocytes are replenished from peripheral pools and bone marrow production. As the half-life of granulocytes is quite short, granulopoiesis, de novo production of granulocytes in bone marrow, plays an important role during emergency. We have previously shown that granulopoiesis at steady state is largely dependent on a transcription factor, C/EBPalpha, whereas emergency granulopoiesis is dependent on C/EBPbeta (Hirai H, et al. Nature Immunol., 2006). However, the precise developmental stage where the shift from C/EBPalpha dependency to C/EBPbeta dependency takes place is almost unknown. The aim of this study is to dissect the process of granulopoiesis by a novel flow cytometric method and to elucidate the molecular mechanisms involved in the regulation of emergency granulopoiesis. Methods: 4 ≂ 106 cfu Candida albicans were intravenously injected to induce emergency granulopoiesis. Mouse bone marrow cells were harvested and stained with a combination of fluorescent-conjugated antibodies including anti-c-kit, anti-CD34, anti-Ly6G antibodies and markers for other lineages. Then the stained cells were analyzed or sorted by flow cytometry. After eliminating the cells which lost potential to give rise to granulocytes, the remaining cells were dissected into five subpopulations (#1≂ #5) according to the expression levels of c-kit and Ly6G. #1 is c-kithigh Ly6Glow cells, @ #2: c-kitint Ly6Glow, #5: c-kitlow Ly6Ghigh, and the cells residing between #2 and #5 are divided into #3 and #4. Cell number, gene expressions and cell cycle status of each population were analyzed before and after inducing emergency granulopoiesis. @ Results and Discussions: Wright-Giemsa staining and qRT-PCR for granule proteins (cathepsin G, myeloperoxidase, neutrophil elastase2, lactoferrin and MMP9) in each population indicated that lower c-kit expression and higher Ly6G expression correlated well with granulocytic differentiation and that the granulopoiesis progresses from # 1 to #5 in this order both at steady state and during emergencies (Figure 1). Then we applied this method to candidemia-induced emergency granulopoiesis. In vivo BrdU incorporation analysis showed immediate acceleration of the cell cycle in the most immature population (#1) and in one of the intermediate populations (#2). Chronological monitoring of each population after inducing candidemia revealed that rapid increase in mature granulocytes (#5) preceded the replenishment from the most immature population (#1). These results suggested that there are two distinct gwavesh in granulopoiesis at the early phase of infection, a rapid supply (first gwaveh) of granulocytes from relatively mature population (#2≂ #4), and a further and sustained supply (second gwaveh) originated from more immature populations (#1) including hematopoietic stem/progenitor cells (Figure 1). Transcripts of C/EBPalpha were significantly downregulated in #1≂ #4 at the early phase of infection, while those of C/EBPbeta were maintained in all the subpopulation (Figure 2), suggesting that shift from C/EBPalpha dependency to C/EBPbeta dependency took place at multiple developmental steps in granulopoiesis. C/EBPbeta has less inhibitory effects on cell cycle than C/EBPalpha while their abilities to induce granulocytic differentiation are similar (Hirai H, et al. Nature Immunol., 2006). The shift toward C/EBPbeta dependency may trigger the dual waves in emergency granulopoiesis, which demands both differentiation and proliferation of granulocytic precursors. Disclosures: No relevant conflicts of interest to declare.

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Hirai, Hideyo, Pu Zhang, Tajhal Dayaram, Christopher J. Hetherington, Shin-ichi Mizuno, Jiro Imanishi, Koichi Akashi und Daniel G. Tenen. „C/EBPβ is required for 'emergency' granulopoiesis“. Nature Immunology 7, Nr. 7 (04.06.2006): 732–39. http://dx.doi.org/10.1038/ni1354.

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Zhang, Huiyuan, Hoainam Nguyen-Jackson, Athanasia Panopoulos, Haiyan S. Li, Peter J. Murray und Stephanie Watowich. „STAT3 Controls Neutrophil Progenitor Growth and Differentiation During Emergency Granulopoiesis.“ Blood 114, Nr. 22 (20.11.2009): 3619. http://dx.doi.org/10.1182/blood.v114.22.3619.3619.

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Abstract Abstract 3619 Poster Board III-555 Granulocyte colony-stimulating factor (G-CSF) controls neutrophil production in the bone marrow under steady state conditions and during demand-driven hematopoiesis occurring in response to infection. STAT3 is a principal signaling molecule activated by the G-CSF receptor (G-CSFR). We previously reported that STAT3 has an important role in demand-driven granulopoiesis, although its cellular and molecular mechanisms have been unclear. To address this, we investigated STAT3 function in emergency granulopoiesis stimulated by G-CSF administration or infection with Listeria monocytogenes, which is restrained by the G-CSF response pathway in vivo. Our results show that STAT3-deficiency renders hematopoietic stem cells and myeloid progenitors refractory to the proliferation-inducing effects of G-CSF or Listeria monocytogenes infection. STAT3-deficient myeloid progenitors have a cell autonomous defect in G-CSF-responsive cell cycle progression and undergo delayed granulocyte maturation relative to wild type cells. To define STAT3 target pathways in granulocytic progenitors, we investigated the expression of CCAAT enhancer binding protein (C/EBP) beta, a transcription factor that is necessary for G-CSF-driven emergency granulopoiesis. We found that STAT3 directly regulates G-CSF-responsive C/EBPbeta expression by binding to Cebpb promoter. Moreover, we show that STAT3 and C/EBPbeta co-regulate c-Myc during emergency granulopoiesis. These results place STAT3 as a crucial G-CSF-responsive signal transducer during demand-driven granulopoiesis, through its regulation of critical transcription factors in developing granulocytes. Disclosures: Zhang: Amgen: Research Funding. Nguyen-Jackson:Amgen: Research Funding. Watowich:Amgen, Inc: Research Funding.

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Dissertationen zum Thema "Emergency granulopoiesis"

Cain, Derek Wilson. „Regulating Emergency Granulopoiesis“. Diss., 2010. http://hdl.handle.net/10161/3130.

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Normally, neutrophil pools are maintained by "steady-state" granulopoiesis. Infections and inflammation, however, trigger neutrophilias that are supported by a hematopoietic program of accelerated granulopoiesis known as "emergency" granulopoiesis. Steady-state and emergency granulopoiesis are thought to depend on distinct members of the CCAAT enhancer binding protein (C/EBP) family of transcription factors, yet the extracellular cues that determine these developmental pathways are unclear. I hypothesize that inflammation elicits IL-1 which acts directly on hematopoietic progenitor cells for the induction of emergency granulopoiesis. Indeed, IL-1RI-/- mice fail to mount reactive neutrophilias in response to adjuvant-induced inflammation. Analysis of this specific impairment revealed an unanticipated role for IL-1RI in supporting increased proliferation by granulocyte/macrophage progenitors (GMP) and, surprisingly, more primitive multipotent progenitors (MPP) and hematopoietic stem cells (HSC). Whereas IL-1 drives HSC proliferation directly in vitro, inflammation induces comparable rates of proliferation in IL-1RI deficient and -sufficient HSC, MPP, and GMP in mixed chimeric mice. Thus, IL-1RI signals play a necessary, but indirect role in the support of alum-induced neutrophilias by expanding both pluripotent and myeloid progenitor compartments to accelerate granulopoiesis.

The lack of alum-induced neutrophilia in IL-1RI-/- mice is due to defective mobilization of bone marrow (BM) neutrophils and impaired proliferation of hematopoietic stem and progenitor cells (HSPC). Coincident defects in neutrophil mobilization and HSPC proliferation suggest that the trigger for emergency granulopoiesis might be the exhaustion of neutrophil compartments rather than inflammatory inductions of growth factors. Consistent with this hypothesis, non-inflammatory reductions in BM neutrophil numbers elicit granulopoietic responses similar to those induced by adjuvant. Alum mobilizes BM neutrophils via G-CSF, but increased HSPC proliferation results from a density-dependent mechanism that is only partially dependent on G-CSF. Notably, C/EBPβ, thought to be necessary for enhanced generative capacity of BM, is dispensable for increased proliferation of HSPC, but plays a role in the terminal differentiation of neutrophils. These observations indicate that the draining of BM neutrophil pools is sufficient to activate a latent, homeostatic mechanism of accelerated granulopoiesis. I propose a common model for the regulation of neutrophil production that explains both steady-state and emergency granulopoiesis through negative feedback.

Dissertation

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Vaníčková, Karolína. „Identifikace nových mechanismů kontrolujících pohotovostní granulopoézu v hematopoetických kmenových a progenitorových buňkách“. Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-446242.

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Granulocytes represent the first line of defense against bacteria and fungi. Daily production of granulocytes is sustained by steady state granulopoiesis but under stress (e.g., bacterial infection) this program switches to emergency granulopoiesis (EG) which ensures the production of granulocytes at enhanced and accelerated rates. Very little is known about the regulation of EG. In this thesis, we showed that disruption of the β-catenin-TCF/LEF mediated transcription impairs EG in vivo. Further, we demonstrated that lipopolysaccharide (LPS) administration in mice induces accumulation of active β-catenin in hematopoietic stem and progenitor cells (HSPCs) as early as 4 hours (H) after stimulation, with highest increase at 24H. This effect was at least partially mediated in a niche independent manner, since LPS stimulation in vitro induced β-catenin accumulation in c-Kit+ cells after 2H, with a peak activation at 4H. Using single cell RNA sequencing, we determined the cell cluster dynamics of HSPCs following 4H LPS stimulation. Interestingly, we identified a possible upstream activator of β- catenin in one of the clusters - Wnt10b. Indeed, Wnt10b showed a similar expression pattern as EG master regulator Cebpb and β-catenin activation, following in vitro treatment with LPS. Altogether, our data point...

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Buchteile zum Thema "Emergency granulopoiesis"

Li, Jie Jack. „Imatinib Mesylate (Gleevec)“. In Top Drugs. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199362585.003.0010.

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Great strides had been made in the war against cancer with chemotherapy even before the emergence of protein kinase inhibitors. For instance, prior to vinblastine (1, Velban) became available in 1964 for the treatment of lymphoma, the diagnosis of Hodgkin’s disease (a cancer of the lymph nodes) was virtually a death sentence. Today there is a 90% chance of survival with the treatment by vinca alkaloids such as 1 and other chemotherapies. Similarly, when Sidney Farber discovered the effects of methotrexate (2, Trexall) on leukemia, it marked the beginning of the triumph over childhood leukemia. Following Barnett Rosenberg’s discovery of cisplatin (3, Platinol)’s effects on tumor cells in 1967, cisplatin and its analogs such as carboplatin (4, Paraplatin) and oxaliplatin (5, Eloxatin) contributed significantly in boosting the survival rate of patients with metastatic testicular cancer, ovarian tumors, and bladder cancer. Most significantly, breast cancer, a malady striking one in eight women, has been effectively managed via a plethora of treatments including surgery, radiation, and chemotherapies. The arsenal of chemotherapeutics for treating breast cancer includes SERMs such as tamoxifen (6) and raloxifene (7, Evista). Type I, II, and III aromatase inhibitors have now also been widely prescribed to combat breast cancers (more details may be found in chap. 4). Today, breast cancer is sometimes viewed as a chronic disease that can be managed, rather than a lethal disease. Despite the efficacy of the aforementioned chemotherapeutics, they kill cancer cells and normal cells with equal ferocity. (Some have compared chemotherapy to a “carpet bombing” strategy.) However, the reason these chemotherapies are effective is that cancer cells divide at much faster rate than normal cells; therefore, chemotherapies kill more malignant cells than healthy cells. Chemotherapies invariably come with significant side effects rooted. For example, hair follicle cells have a physiologically high mitosis rate; therefore, chemotherapies kill them faster than other healthy cells. In the same vein, other common side effects of chemotherapy include diarrhea (because ephithelial renewal is inhibited), bone marrow suppression (because granulopoiesis, thrombopoiesis, cytopoiesis, and erythropoiesis are inhibited), and lymph node damage (because of lymphocyte multiplication inhibition causes immune weakness).

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Konferenzberichte zum Thema "Emergency granulopoiesis"

Ng, J., F. Guo, A. Marneth, S. Ghanta, M. Y. Kwon, K. Wright, X. Liu et al. „Augmenting Emergency Granulopoiesis with CpG-ODN Conditioned Mesenchymal Stromal Cells for the Treatment of Neutropenia-Related Pneumonia“. In American Thoracic Society 2020 International Conference, May 15-20, 2020 - Philadelphia, PA. American Thoracic Society, 2020. http://dx.doi.org/10.1164/ajrccm-conference.2020.201.1_meetingabstracts.a7736.

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Berichte der Organisationen zum Thema "Emergency granulopoiesis"

Abrams, Scott. Granulopoietic Growth Factor Secretion in Ovarian Carcinoma as a Mechanism for the Emergence of Immune Suppressive Myeloid Subsets. Fort Belvoir, VA: Defense Technical Information Center, August 2014. http://dx.doi.org/10.21236/ada609215.

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