Metabolic disorders, including obesity and diabetes, are the leading cause of preventable death in the U.S. The incidence of gestational diabetes has similarly increased. The impact of physiologically elevated glucose levels on hematopoiesis is not established. Hematopoietic stem cells (HSCs) are essential for survival, as they function to produce each of the mature blood cell lineages throughout the lifespan of the organism. The first HSCs arise from hemogenic endothelium in the aorta-gonad-mesonephros (AGM) region. Most genes involved in HSC formation, such as RUNX1, are highly conserved across vertebrates, and continue to regulate HSC homeostasis in the adult. We have successfully used zebrafish to identify novel regulators of vertebrate HSCs, resulting in the first FDA-approved clinical trial originating from zebrafish studies. To assess the impact of metabolic regulation on HSCs, we exposed zebrafish embryos to increasing physiological doses of glucose and observed that elevated glucose levels enhanced the timing and magnitude of embryonic HSC formation. Our long-term goal is to characterize the impact of nutrient availability on HSC formation and function. Our objective here is to characterize the effects of modulation of glucose metabolism on HSC induction, proliferation and differentiation in the vertebrate embryo. Our central hypothesis is that glucose- metabolism impacts HSC formation via production of ROS and subsequent hif1? stabilization to drive coordinate expression of hematopoietic genes. The rationale for our work is that an understanding of the impact of physiological glucose fluctuations on HSCs will elucidate potential risks of dysregulated metabolism on the hematopoietic system, which has long-term consequences for immunity.
In Specific Aim 1, we will assess the impact of excess glucose on the spatio-temporal onset and progression of HSC development. Using chemical and genetic modulation of metabolism, we will identify the mechanism by which glucose impacts HSC-related transcriptional regulation via hif1?. Our preliminary data show physiological glucose elevation significantly accelerates HSC induction.
In Specific Aim 2, we will assess the impact of acute versus chronic hyperglycemia and coordinated hif1? target gene regulation on HSC function. We will confirm the evolutionary conservation of these effects in an adult injury model, murine gestational diabetes models and in human umbilical cord blood. Our preliminary data indicate glucose exposure enhances recovery after marrow injury and hif1? activity in the AGM and placenta correlates with HSC production, suggesting glucose metabolism is a conserved regulatory factor. The expected outcomes of this proposal are a detailed understanding of the spatio-temporal dynamics and molecular mechanisms of glucose metabolism-mediated HSC regulation. These results will provide insight into how the developing organism senses and responds to fluctuations in nutrient supply to match hematopoietic output with anticipated growth rates, and will have a direct impact on our understanding of the risks of gestational diabetes on hematopoiesis and for therapeutic HSC modulation.
Hematopoietic stem cells form the foundation of our blood and immune system; the formation and function of these cells are carefully controlled in the body. The proposed research will help identify metabolic mechanisms that regulate the birth and propagation of these stem cells. This work has relevance for understanding how stem cells are formed, the impact of elevated blood glucose on stem cell action, and stem cell transplantation.
|Vo, Linda T; Kinney, Melissa A; Liu, Xin et al. (2018) Regulation of embryonic haematopoietic multipotency by EZH1. Nature 553:506-510|
|Lummertz da Rocha, Edroaldo; Rowe, R Grant; Lundin, Vanessa et al. (2018) Reconstruction of complex single-cell trajectories using CellRouter. Nat Commun 9:892|
|Oo, Zaw Min; Illendula, Anuradha; Grembecka, Jolanta et al. (2018) A tool compound targeting the core binding factor Runt domain to disrupt binding to CBF? in leukemic cells. Leuk Lymphoma 59:2188-2200|
|Theodore, Lindsay N; Hagedorn, Elliott J; Cortes, Mauricio et al. (2017) Distinct Roles for Matrix Metalloproteinases 2 and 9 in Embryonic Hematopoietic Stem Cell Emergence, Migration, and Niche Colonization. Stem Cell Reports 8:1226-1241|
|Lim, Sung-Eun; Esain, Virginie; Kwan, Wanda et al. (2017) HIF1?-induced PDGFR? signaling promotes developmental HSC production via IL-6 activation. Exp Hematol 46:83-95.e6|
|Kanz, Dirk; Konantz, Martina; Alghisi, Elisa et al. (2016) Endothelial-to-hematopoietic transition: Notch-ing vessels into blood. Ann N Y Acad Sci 1370:97-108|
|Konantz, Martina; Alghisi, Elisa; Müller, Joëlle S et al. (2016) Evi1 regulates Notch activation to induce zebrafish hematopoietic stem cell emergence. EMBO J 35:2315-2331|
|Goessling, Wolfram; North, Trista E (2016) EnaBILEing Growth in the Fetal Liver. Cell Stem Cell 18:427-8|
|Nissim, Sahar; Weeks, Olivia; Talbot, Jared C et al. (2016) Iterative use of nuclear receptor Nr5a2 regulates multiple stages of liver and pancreas development. Dev Biol 418:108-123|
|Moore, Finola E; Garcia, Elaine G; Lobbardi, Riadh et al. (2016) Single-cell transcriptional analysis of normal, aberrant, and malignant hematopoiesis in zebrafish. J Exp Med 213:979-92|
Showing the most recent 10 out of 20 publications