scholarly journals Hedgehog Signaling Is Dispensable for Adult Hematopoietic Stem Cell Function

2009 ◽  
Vol 4 (6) ◽  
pp. 548-558 ◽  
Author(s):  
Jie Gao ◽  
Stephanie Graves ◽  
Ute Koch ◽  
Suqing Liu ◽  
Vladimir Jankovic ◽  
...  
Keyword(s):  
Stem Cell ◽  
Hematopoietic Stem Cell ◽  
Hedgehog Signaling ◽  
Cell Function ◽  
Hematopoietic Stem

scholarly journals Hedgehog Signaling Is Dispensable for Adult Murine Hematopoietic Stem Cell Function and Hematopoiesis

2009 ◽  
Vol 4 (6) ◽  
pp. 559-567 ◽  
Author(s):  
Inga Hofmann ◽  
Elizabeth H. Stover ◽  
Dana E. Cullen ◽  
Junhao Mao ◽  
Kelly J. Morgan ◽  
...  
Keyword(s):  
Stem Cell ◽  
Hematopoietic Stem Cell ◽  
Hedgehog Signaling ◽  
Cell Function ◽  
Hematopoietic Stem ◽  
Murine Hematopoietic Stem Cell

scholarly journals Prostaglandin E2 Enhances Aged Hematopoietic Stem Cell Function

2021 ◽  
Author(s):  
Andrea M. Patterson ◽  
P. Artur Plett ◽  
Carol H. Sampson ◽  
Edward Simpson ◽  
Yunlong Liu ◽  
...  
Keyword(s):  
Stem Cell ◽  
Prostaglandin E2 ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Hematopoietic Stem

scholarly journals Hematopoietic Stem Cell Function in a Murine Model of Sickle Cell Disease

Anemia ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Elisabeth H. Javazon ◽  
Mohamed Radhi ◽  
Bagirath Gangadharan ◽  
Jennifer Perry ◽  
David R. Archer
Keyword(s):  
Cell Cycle ◽  
Lipid Peroxidation ◽  
Bone Marrow ◽  
Stem Cell ◽  
Sickle Cell Disease ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Cell Disease ◽  
Hematopoietic Progenitor ◽  
Hematopoietic Stem

Previous studies have shown that the sickle environment is highly enriched for reactive oxygen species (ROS). We examined the oxidative effects of sickle cell disease on hematopoietic stem cell function in a sickle mouse model.In vitrocolony-forming assays showed a significant decrease in progenitor colony formation derived from sickle compared to control bone marrow (BM). Sickle BM possessed a significant decrease in the KSL (c-kit+, Sca-1+, Lineage−) progenitor population, and cell cycle analysis showed that there were fewer KSL cells in the G0phase of the cell cycle compared to controls. We found a significant increase in both lipid peroxidation and ROS in sickle-derived KSL cells.In vivoanalysis demonstrated that normal bone marrow cells engraft with increased frequency into sickle mice compared to control mice. Hematopoietic progenitor cells derived from sickle mice, however, demonstrated significant impairment in engraftment potential. We observed partial restoration of engraftment by n-acetyl cysteine (NAC) treatment of KSL cells prior to transplantation. Increased intracellular ROS and lipid peroxidation combined with improvement in engraftment following NAC treatment suggests that an altered redox environment in sickle mice affects hematopoietic progenitor and stem cell function.

Loss of FancC Function Results in Decreased Hematopoietic Stem Cell Repopulating Ability

Blood ◽  
1999 ◽  
Vol 94 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Laura S. Haneline ◽  
Troy A. Gobbett ◽  
Rema Ramani ◽  
Madeleine Carreau ◽  
Manuel Buchwald ◽  
...  
Keyword(s):  
Stem Cell ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Genetic Disorder ◽  
Test Cell ◽  
Hematopoietic Stem ◽  
Murine Homologue ◽  
Complex Genetic Disorder

Fanconi anemia (FA) is a complex genetic disorder characterized by progressive bone marrow (BM) aplasia, chromosomal instability, and acquisition of malignancies, particularly myeloid leukemia. We used a murine model containing a disruption of the murine homologue ofFANCC (FancC) to evaluate short- and long-term multilineage repopulating ability of FancC −/− cells in vivo. Competitive repopulation assays were conducted where “test”FancC −/− or FancC +/+ BM cells (expressing CD45.2) were cotransplanted with congenic competitor cells (expressing CD45.1) into irradiated mice. In two independent experiments, we determined that FancC −/− BM cells have a profound decrease in short-term, as well as long-term, multilineage repopulating ability. To determine quantitatively the relative production of progeny cells by each test cell population, we calculated test cell contribution to chimerism as compared with 1 × 105 competitor cells. We determined that FancC −/− cells have a 7-fold to 12-fold decrease in repopulating ability compared with FancC +/+cells. These data indicate that loss of FancC function results in reduced in vivo repopulating ability of pluripotential hematopoietic stem cells, which may play a role in the development of the BM failure in FA patients. This model system provides a powerful tool for evaluation of experimental therapeutics on hematopoietic stem cell function.

scholarly journals 193Normal hematopoietic stem cell function in mice following treatment with bortezomib

2003 ◽  
Vol 9 (2) ◽  
pp. 121 ◽  
Author(s):  
M. Pitzgerald ◽  
C. Fraser ◽  
I. Webb ◽  
D. Schenkein ◽  
D. Esseltine ◽  
...  
Keyword(s):  
Stem Cell ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Hematopoietic Stem

scholarly journals Jak1 Integrates Cytokine Sensing to Regulate Hematopoietic Stem Cell Function and Stress Hematopoiesis

2018 ◽  
Vol 22 (2) ◽  
pp. 277 ◽  
Author(s):  
Maria Kleppe ◽  
Matthew H. Spitzer ◽  
Sheng Li ◽  
Corinne E. Hill ◽  
Lauren Dong ◽  
...  
Keyword(s):  
Stem Cell ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Hematopoietic Stem

scholarly journals TWIST1 Preserves Hematopoietic Stem Cell Function Via Repression of Cacna1b Expression

Blood ◽  
2020 ◽  
Vol 136 (Supplement 1) ◽  
pp. 12-12
Author(s):  
Nan Wang ◽  
Jing Yin ◽  
Na You ◽  
Dan Guo ◽  
Yangyang Zhao ◽  
...  
Keyword(s):  
Stem Cell ◽  
Steady State ◽  
Calcium Channel ◽  
Cell Fate ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Conflicts Of Interest ◽  
Hematopoietic Stem ◽  
Voltage Gated ◽  
Voltage Gated Calcium Channel

The mitochondria of hematopoietic stem cell (HSC) play crucial roles in regulating cell fate and in preserving HSC functionality and survival. However, the mechanism underlying its regulation remain poorly understood. Here, we identify transcription factor TWIST1 as a novel regulator of HSC maintenance through modulating mitochondrial function. We demonstrate that Twist1 deletion results in a significantly decreased long-term HSC (LT-HSC) frequency, markedly reduced dormancy and self-renewal capacities and skewed myeloid differentiation in steady-state hematopoiesis. Twist1-deficient LT-HSC are more compromised in tolerance of irradiation and 5 fluorouracil-induced stresses, and exhibit typical phenotypes of senescence and higher levels of DNA damage and apoptosis. Mechanistically, Twist1 deficiency upregulates the expression of voltage-gated calcium channel Cacna1b in HSC, leading to noticeable increases in mitochondrial calcium levels, biogenesis, metabolic activity and reactive oxygen species production. Suppression of voltage-gated calcium channel by a calcium channel blocker largely rescues the phenotypic and functional defects in Twist1-deleted HSCs under both steady-state and stress conditions. Collectively, our data, for the first time, characterize TWIST1 as a critical regulator of HSC function acting through CACNA1B/Ca2+/mitochondria axis, and highlight the importance of Ca2+ in HSC maintenance. These observations provide new insights into the mechanisms for the control of HSC fate. Disclosures No relevant conflicts of interest to declare.

The histone lysine acetyltransferase HBO1 (KAT7) regulates hematopoietic stem cell quiescence and self-renewal

Blood ◽  
2021 ◽  
Author(s):  
Yuqing Yang ◽  
Andrew J Kueh ◽  
Zoe Grant ◽  
Waruni Abeysekera ◽  
Alexandra L Garnham ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Stem Cell ◽  
Progenitor Cells ◽  
Hematopoietic Stem Cell ◽  
Cell Function ◽  
Bone Marrow Cells ◽  
High Rate ◽  
Embryonic Patterning ◽  
Self Renewal ◽  
Hematopoietic Stem

The histone acetyltransferase HBO1 (MYST2, KAT7) is indispensable for postgastrulation development, histone H3 lysine 14 acetylation (H3K14Ac) and the expression of embryonic patterning genes. In this study, we report the role of HBO1 in regulating hematopoietic stem cell function in adult hematopoiesis. We used two complementary cre-recombinase transgenes to conditionally delete Hbo1 (Mx1-Cre and Rosa26-CreERT2). Hbo1 null mice became moribund due to hematopoietic failure with pancytopenia in the blood and bone marrow two to six weeks after Hbo1 deletion. Hbo1 deleted bone marrow cells failed to repopulate hemoablated recipients in competitive transplantation experiments. Hbo1 deletion caused a rapid loss of hematopoietic progenitors (HPCs). The numbers of lineage-restricted progenitors for the erythroid, myeloid, B-and T-cell lineages were reduced. Loss of HBO1 resulted in an abnormally high rate of recruitment of quiescent hematopoietic stem cells (HSCs) into the cell cycle. Cycling HSCs produced progenitors at the expense of self-renewal, which led to the exhaustion of the HSC pool. Mechanistically, genes important for HSC functions were downregulated in HSC-enriched cell populations after Hbo1 deletion, including genes essential for HSC quiescence and self-renewal, such as Mpl, Tek(Tie-2), Gfi1b, Egr1, Tal1(Scl), Gata2, Erg, Pbx1, Meis1 and Hox9, as well as genes important for multipotent progenitor cells and lineage-specific progenitor cells, such as Gata1. HBO1 was required for H3K14Ac through the genome and particularly at gene loci required for HSC quiescence and self-renewal. Our data indicate that HBO1 promotes the expression of a transcription factor network essential for HSC maintenance and self-renewal in adult hematopoiesis.

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