Expression profile of Imatinib treated BAF3 -BCR-ABL cells
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE75056 | GEO | 2017/03/20
SECONDARY ACCESSION(S): PRJNA302300
REPOSITORIES: GEO
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Project description:The Baf3 are dependent on IL-3 for grwoth however transformation by BCR -ABL oncogene causes BAf3 cells independent of IL-3. The BAf3 cells expressing BCR-ABL are dependent on continuous expression of BCR_ABL for growth. Inhibitionof BCR-ABL by its inhibitor Imatinib cause these cells to undergo apoptosis. When these cells are grown with IL-3 these cells do not respond to Imatinib mediated grwoth arrest.
2017-03-20 | GSE75057 | GEO
Project description:Tyrosine kinase activity is the crucial enzymatic activity driving all known functions of the BCR-ABL protein and is required for protection from apoptosis by BCR-ABL, therefore, targeting this enzyme is an effective approach for therapeutic strategies. Recently, a novel structural entity, imatinib (STI571; Novartis, Basel, Switzerland), a potent and selective inhibitor of the tyrosine kinase activity of BCR-ABL, has shown promise against Ph-positive leukemia in human clinical trials. However, the emergence of imatinib resistance in patients with acute forms of Ph-positive leukemia has highlighted the need for overriding chemotherapy to eradicate this disease. AMN107 and BMS-354825 are clinically active “next-generation” BCR-ABL inhibitors. One potentially powerful approach is to use these compounds in combination with imatinib. The rationale for such approaches is that an inhibitor cocktail may target the widest range of resistant clones and thereby delay the onset of acquired drug resistance. More potent BCR-ABL inhibitors would be to target residual leukemia that persists in patients in whom imatinib induces durable remission but failed to eradicate the disease. From these points, our studies are performed to determine (1) the differences of molecular signaling pathways between BMS-354825 and imatinib (2) the mechanisms by which drug resistance of BMS-354825 and imatinib occur except for point mutation of BCR-ABL kinase domain. Keywords: drug sensitivity
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Project description:One of the main objective of this study is to characterize Imatinib induced MSCs-mediated resistance evolution in BCR-ABL+ ALL. Tyrosine kinase inhibitor (TKI) Imatinib (IM) is used as a frontline therapy for BCR-ABL–positive (BCR-ABL+) acute lymphoblastic leukemia (ALL). However, resistance to IM therapy develops rapidly in a substantial proportion of treated patients, and the molecular mechanisms underlying the resistance are poorly understood. In this study, we identified a novel cascade of consequential events that are initiated by IM, which traverse through mesenchymal stem/stromal cells (MSCs) to leukemic cells, and lead to IM resistance. Our data showed that MSCs exposed to IM were decreased in their stemness and acquired a new functional status that enabled the formation of leukemic cell niches. These MSCs had increased expression of genes encoding chemo-attractants, adhesion molecules, and pro-survival stimulant growth factors. We found that BCR-ABL+ leukemic cells persistently exposed to IM were able to switch from BCR-ABL–driven signaling to growth factor–driven signaling for survival, and this switch was reversible. Blocking both the BCR-ABL–driven pathway and the growth factor–driven JAK pathway effectively eradicated the leukemic cell niches. Our findings illustrate TKI-induced, MSC-mediated drug resistance, suggesting an effective way to eliminate this type of drug resistance in patients with BCR-ABL+ ALL.
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Project description:One of the main objective of this study is to characterize Imatinib induced MSCs-mediated resistance evolution in BCR-ABL+ ALL. Tyrosine kinase inhibitor (TKI) Imatinib (IM) is used as a frontline therapy for BCR-ABL–positive (BCR-ABL+) acute lymphoblastic leukemia (ALL). However, resistance to IM therapy develops rapidly in a substantial proportion of treated patients, and the molecular mechanisms underlying the resistance are poorly understood. In this study, we identified a novel cascade of consequential events that are initiated by IM, which traverse through mesenchymal stem/stromal cells (MSCs) to leukemic cells, and lead to IM resistance. Our data showed that MSCs exposed to IM were decreased in their stemness and acquired a new functional status that enabled the formation of leukemic cell niches. These MSCs had increased expression of genes encoding chemo-attractants, adhesion molecules, and pro-survival stimulant growth factors. We found that BCR-ABL+ leukemic cells persistently exposed to IM were able to switch from BCR-ABL–driven signaling to growth factor–driven signaling for survival, and this switch was reversible. Blocking both the BCR-ABL–driven pathway and the growth factor–driven JAK pathway effectively eradicated the leukemic cell niches. Our findings illustrate TKI-induced, MSC-mediated drug resistance, suggesting an effective way to eliminate this type of drug resistance in patients with BCR-ABL+ ALL. Gene expression signatures were compared from triplicate samples of MSCs that were either treated with vehicle or imatinib for 32, 64 and 96 hours.
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Project description:Interferon is effective at inducing complete remissions in patients with Chronic Myelogenous Leukemia (CML), and evidence supports an immune mechanism. Here we show that the Type I Interferons (alpha and beta) regulate expression of the Interferon consensus sequence binding protein (ICSBP) in bcr-abl transformed cells and as shown previously for ICSBP, induce a vaccine-like immunoprotective effect in a murine model of bcr-abl induced leukemia. We identify the chemokines CCL6 and CCL9 as genes prominently induced by the Type I Interferons and ICSBP, and demonstrate that these immunomodulators are required for the immunoprotective effect of ICSBP expression. Insights into the role of these chemokines in the anti-leukemic response of interferons suggest new strategies for immunotherapy of CML. Experiment Overall Design: Total RNA was isolated from parental BaF3 cells as well as BaF3 cells expressing BCR-ABL, ICSBP, or both BCR-ABL and ICSBP. Using standard Affymetrix protocols the RNA samples were analyzed for gene expression using Affymetrix mouse 430_2 whole genome microarrays arrays. A threshold value of 50 was set for all genes and the list of genes filtered to include only those that had at least one Present flag ("P" flag) in one of the 4 conditions. For each gene, the ratio of its expression in a particular condition and its expression in parental BaF3 cells was determined. Only genes that had at least a 3-fold up or down change in expression were considered, leaving a set of 1431 genes for further analysis. K-means clustering with Gene cluster 3.0 was used to group these 1431 genes into 15 clusters and JavaTree was used to visualize the results.
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Project description:Chronic myelogenous leukemia (CML) is a malignant disease of the hematopoietic stem cell, characterized by the expression of the Bcr-Abl oncogene by leukemic cells. In order to analyze the molecular pathways modulated by Bcr-Abl, we have previously generated an inducible model of Bcr-Abl expression in the murine Ba/F3 cell line based on the Tet-OFF system. In the present study, through a microarray approach applied to cells grown with (Bcr-Abl-expression OFF) or without (Bcr-Abl-expression ON) doxycycline, a tetracycline analogue, we analyzed the gene expression variations upon Bcr-Abl expression. Keywords: repeat sample
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Project description:Imatinib is highly effective in the treatment of chronic myelogenous leukemia (CML), but the primary and acquired imatinib resistance remains the big hurdle. Molecular mechanisms for CML resistance to tyrosine kinase inhibitors, beyond point mutations in BCR-ABL kinase domain, still need to be addressed. Here, we demonstrated that TXNIP is a novel BCR-ABL target gene. Suppression of TXNIP is responsible for BCR-ABL triggered glucose metabolic reprogramming and mitochondrial homeostasis. Mechanistically, Miz-1/P300 complex transactivates TXNIP through the recognition of TXNIP core promoter region, responding to the c-Myc suppression by either imatinib or BCR-ABL knockdown. TXNIP restoration sensitizes CML cells to imatinib treatment and compromises imatinib resistant CML cell survival, predominantly through the blockage of both glycolysis and glucose oxidation which results in the mitochondrial dysfunction and ATP production. In particular, TXNIP suppresses expressions of the key glycolytic enzyme, HK2 and LDHA, potentially through Fbw7-dependent c-Myc degradation. In accordance, BCR-ABL suppression of TXNIP provides a novel survival pathway for the transformation of mouse BM cells. Combination of drug inducing TXNIP expression with imatinib synergistically kills CML cells from patients and further extends the survival of CML mice. Thus, the activation of TXNIP represents an effective strategy for CML treatment to overcome resistance.
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Project description:Aberrantly expressed long noncoding RNAs (lncRNAs) have been described in diverse human diseases and cancer development. Chronic myeloid leukemia (CML) is a hematological malignancy induced by Bcr-Abl hybrid gene. Owing to the development of tyrosine kinase inhibitors (TKIs), especially the first-generation Imatinib, over 90% of CML patients can be cured in recent years. Here we attempt to identify Imatinib-inducible lncRNAs associated with CML by analyzing lncRNA expression profiles in K562 cells after Imatinib or control treatment. LncRNA microarray analysis revealed that numerous lncRNAs were differentially expressed in K562 cells after Imatinib treatment. In this study, we focus on a conserved, Imatinib-inducible lncRNA (IIR) family, named lncRNA-IIRX. Upregulation of lncRNA-IIRX has been detected in both human and mouse Abl-transformed cell lines after Imatinib treatment. Interestingly, lncRNA-IIRX levels were significantly lower in leukemic cells derived from Bcr-Abl-positive ALL patients than those in normal control group. Furthermore, altering lncRNA-IIRX expression remarkably affected survival of Abl-transformed leukemic cells, and tumorigensis induced by these leukemic cells in xenograft mouse model. Knockdown of lncRNA-IIRX in transgenic mice significantly promoted Bcr-Abl-mediated primary bone marrow transformation, and leukemia development in leukemia mouse model. These results indicate that lncRNA-IIRX functions as a suppressor gene in Bcr-Abl-induced tumorigenesis, and may provide novel insights into complicated mechanisms underlying cellular transformation by Bcr-Abl oncogene. This microarray was performed to identify Imatinib-inducible lncRNAs associated with CML.
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