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Genome expression analysis of Lung Progenitors matured in the presence of constitutively active or pharmacologically inhibited Glycogen Synthase Kinase 3

ABSTRACT: In 3D cultures of hPSC-derived lung progenitors withdrawal of the GSK3 inhibitor, CHIR99021, induces multilineage maturation, including of proximal cells, type I alveolar epithelial cells and morphologically mature type II cells.

ORGANISM(S): Homo sapiens

PROVIDER: GSE101558 | GEO | 2019/01/30

REPOSITORIES: GEO

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Project description:The cellular origin and molecular progression towards aggressive cancers such as acute myeloid leukemia (AML) remain elusive. Clinically, Myelodysplastic syndromes (MDS) and related myeloproliferative neoplasias (MPN) disorders1-5 are believed to present as a precursor stage to lethal AML development. Despite the identification of cytogenetic abnormalities and increased activation of signaling in human MDS/MPN, specific pathways that either sustain or initiate disease progression and evolve into self-sustaining leukemic-initiating cells (L-ICs)13 have not been elucidated. Here we demonstrate that tissue specific loss of glycogen synthase kinase-3Î² (GSK3 betaÎ²) initiates the emergence of stable Pre-leukemic-ICs (PLIC) in vivo. In contrast to deletion or transgenic perturbation of pathways associated with AML eg. Î²-catenin/Wnt, serial transplantation of PL-IC produced abnormal hematological disease that phenotypically and molecularly resembles human MDS/MPN. PL-ICs were exclusively generated from GSK3 betaÎ² deficient hematopoietic stem cells (HSCs), indicating that disease initiation events collaborate with existing HSC self-renewal machinery. In the absence of GSK3 betaÎ², subsequent deletion of GSK3 betaÎ± caused rapid induction of L-ICs that give rise to lethal AML. As these processes were solely driven by dose-dependent deficiencies in GSK3 beta levels, our results suggest that perturbation of this pathway can sufficiently drive and recapitulate a step-wise progression of disease from HSCs to MDS/MPN and subsequent AML. Our study provides a molecular and cellular foundation to understand AML evolution from pre-leukemic precursors. We suggest that defining the molecular states of pre-neoplastic disease will allow patient stratification at early stages of MDS/MPN onset and aid in the development of therapeutic targeting of causal pathways responsible for the earliest stages of leukemic initiation events. 5 week post-transplanted recipient mice (CD45.1) with either Lin- bone marrow GSK3 alpha +/+ beta +/flx, alpha+/+ beta flx/flx, alpha -/- beta +/+ or alpha-/- beta fx/flx Rosa26-CreERTM cells (CD45.2) were induced 3 times with intraperitoneal injections of Tamoxifen (75mg/kg) at intervals of two to three days. Mice were sacrificed and analyzed 4 weeks after injection. Bone marrow lineage negative (Lin-), Sca1+, cKit+ cells were sorted from engrafted Lin- bone marrow GSK3 alpha +/+ beta +/flx, alpha+/+ beta flx/flx, alpha -/- beta +/+ or alpha-/- beta fx/flx cells for RNA extraction. Total RNA from purified populations was extracted and amplified as described previously (Shojaei et al., 2005). Amplified-labeled RNA was hybridized to Affymetrix Mouse Genome 430 2.0 Array.

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Genome expression analysis of Lung Progenitors matured in the presence of constitutively active or pharmacologically inhibited Glycogen Synthase Kinase 3

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