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Novel IDH1 Mutant Inhibitors for Treatment of Acute Myeloid Leukemia (expression)

ABSTRACT: Neomorphic mutations in isocitrate dehydrogenase 1 (IDH1) are driver mutations in acute myeloid leukemia (AML) and other cancers. We report the development of new allosteric inhibitors of mutant IDH1. Crystallographic and biochemical results demonstrated that compounds of this chemical series bind to an allosteric site and lock the enzyme in a catalytically inactive conformation, thereby enabling inhibition of different clinically relevant IDH1 mutants. Treatment of IDH1 mutant primary AML cells uniformly led to a decrease in intracellular 2-HG, abrogation of the myeloid differentiation block and induction of granulocytic differentiation at the level of leukemic blasts and more immature stem-like cells, in vitro and in vivo. Molecularly, treatment with the inhibitors led to a reversal of the DNA cytosine hypermethylation patterns caused by mutant IDH1 in AML patients’ cells. Our study provides proof-of-concept for the molecular and biological activity of novel allosteric inhibitors for targeting different mutant forms of IDH1 in leukemia. To obtain insight into the molecular mechanism for the induction of granulocytic differentiation and cell death following inhibition of IDH1 mutant protein in primary AML cells, we performed gene expression microarrays following treatment with either GSK321 IDH1 inhibitor or Controls (DMSO or GSK990 inactive inhibitor).

ORGANISM(S): Homo sapiens

PROVIDER: GSE72152 | GEO | 2015/09/21

SECONDARY ACCESSION(S): PRJNA293205

REPOSITORIES: GEO

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Novel IDH1 Mutant Inhibitors for Treatment of Acute Myeloid Leukemia (expression)

Project description:Neomorphic mutations in isocitrate dehydrogenase 1 (IDH1) are driver mutations in acute myeloid leukemia (AML) and other cancers. We report the development of new allosteric inhibitors of mutant IDH1. Crystallographic and biochemical results demonstrated that compounds of this chemical series bind to an allosteric site and lock the enzyme in a catalytically inactive conformation, thereby enabling inhibition of different clinically relevant IDH1 mutants. Treatment of IDH1 mutant primary AML cells uniformly led to a decrease in intracellular 2-HG, abrogation of the myeloid differentiation block and induction of granulocytic differentiation at the level of leukemic blasts and more immature stem-like cells, in vitro and in vivo. Molecularly, treatment with the inhibitors led to a reversal of the DNA cytosine hypermethylation patterns caused by mutant IDH1 in AML patients’ cells. Our study provides proof-of-concept for the molecular and biological activity of novel allosteric inhibitors for targeting different mutant forms of IDH1 in leukemia. To obtain insight into the molecular mechanism for the induction of granulocytic differentiation and cell death following inhibition of IDH1 mutant protein in primary AML cells, we performed gene expression microarrays following treatment with either GSK321 IDH1 inhibitor or Controls (DMSO or GSK990 inactive inhibitor). Primary IDH1 mutant acute myeloid leukemia (AML) mononuclear (MNC) cells were treated in suspension cultures in differentiating media for 6 days with 3 microM GSK990 or GSK321 and an equal volume of DMSO. Followed by microarray analysis after RNA extraction.

2015-09-21 | E-GEOD-72152 | biostudies-arrayexpress

Novel IDH1 Mutant Inhibitors for Treatment of Acute Myeloid Leukemia (ERRBS)

Project description:Neomorphic mutations in isocitrate dehydrogenase 1 (IDH1) are driver mutations in acute myeloid leukemia (AML) and other cancers. We report the development of new allosteric inhibitors of mutant IDH1. Crystallographic and biochemical results demonstrated that compounds of this chemical series bind to an allosteric site and lock the enzyme in a catalytically inactive conformation, thereby enabling inhibition of different clinically relevant IDH1 mutants. Treatment of IDH1 mutant primary AML cells uniformly led to a decrease in intracellular 2-HG, abrogation of the myeloid differentiation block and induction of granulocytic differentiation at the level of leukemic blasts and more immature stem-like cells, in vitro and in vivo. Molecularly, treatment with the inhibitors led to a reversal of the DNA cytosine hypermethylation patterns caused by mutant IDH1 in AML patients’ cells. Our study provides proof-of-concept for the molecular and biological activity of novel allosteric inhibitors for targeting different mutant forms of IDH1 in leukemia. To obtain insight into the molecular mechanism of the novel IDH1 mutant allosteric inhibitor, primary AML cells were treated with either GSK321 IDH1 active inhibitor or Controls (DMSO or GSK990 inactive inhibitor) followed by DNA extraction for ERRBS analysis. Primary IDH1 mutant acute myeloid leukemia (AML) mononuclear (MNC) cells were treated in suspension cultures in differentiating media for 6 days with 3 microM GSK990 or GSK321 and an equal volume of DMSO, Followed ERRBS analysis after DNA extraction.

2015-09-21 | E-GEOD-72247 | biostudies-arrayexpress

Novel IDH1 Mutant Inhibitors for Treatment of Acute Myeloid Leukemia (ERRBS)

Project description:Neomorphic mutations in isocitrate dehydrogenase 1 (IDH1) are driver mutations in acute myeloid leukemia (AML) and other cancers. We report the development of new allosteric inhibitors of mutant IDH1. Crystallographic and biochemical results demonstrated that compounds of this chemical series bind to an allosteric site and lock the enzyme in a catalytically inactive conformation, thereby enabling inhibition of different clinically relevant IDH1 mutants. Treatment of IDH1 mutant primary AML cells uniformly led to a decrease in intracellular 2-HG, abrogation of the myeloid differentiation block and induction of granulocytic differentiation at the level of leukemic blasts and more immature stem-like cells, in vitro and in vivo. Molecularly, treatment with the inhibitors led to a reversal of the DNA cytosine hypermethylation patterns caused by mutant IDH1 in AML patients’ cells. Our study provides proof-of-concept for the molecular and biological activity of novel allosteric inhibitors for targeting different mutant forms of IDH1 in leukemia. To obtain insight into the molecular mechanism of the novel IDH1 mutant allosteric inhibitor, primary AML cells were treated with either GSK321 IDH1 active inhibitor or Controls (DMSO or GSK990 inactive inhibitor) followed by DNA extraction for ERRBS analysis.

2015-09-21 | GSE72247 | GEO

Evolution of AML genome and epigenome with IDH inhibitors and their association with clinical response and resistance [RNA-seq]

Project description:Allosteric inhibitors of mutant IDH1 or IDH2 induce terminal differentiation in mutant leukemic blasts and may provide durable clinical responses in approximately 40% of acute myeloid leukemia (AML) patients with the mutations. However, most responders eventually relapse. To understand the molecular underpinnings of clinical resistance, we performed multipronged genomic analyses (DNA sequencing, RNA sequencing and cytosine methylation profiling) in longitudinally collected specimens from 68 IDH1/IDH2-mutant AML patients treated with IDH inhibitors (IDHi), and described the evolution of AML genome and epigenome during the therapy and its association with clinical response and relapse. Co-occurrence of mutations in RUNX1/CEBPA or RAS-RTK pathway genes were associated with poor response to IDHi. The same group of mutations were also frequently selected or acquired at relapse. In addition, acquired mutations in BCOR, reciprocal IDH gene, and TET2 were also implicated at relapse. DNA methylation changes largely mirrored plasma 2HG dynamics and had little association with clinical response to IDHi. The mapping of mutation dynamics and methylation changes in longitudinal samples revealed the interplay between AML genome and epigenome with IDHi therapy. While the alteration in RAS-RTK signaling genes and RUNX1/CEBPA were the key molecular pathways involved in clinical resistance to IDHi, diverse molecular pathways were involved in IDHi resistance. The data highlights the role of clonal heterogeneity in therapeutic resistance in AML and implicates opportunities for novel combination strategies.

2021-03-11 | GSE153348 | GEO

Evolution of AML genome and epigenome with IDH inhibitors and their association with clinical response and resistance [methylation]

2021-03-11 | GSE153347 | GEO

Limited nutrient availability in the tumor microenvironment renders pancreatic tumors sensitive to allosteric IDH1 inhibitors

Project description:<p>Nutrient-deprived conditions in the tumor microenvironment (TME) restrain cancer cell viability due to increased free radicals and reduced energy production. In pancreatic cancer cells, a cytosolic metabolic enzyme, wild-type isocitrate dehydrogenase 1 (wtIDH1), enables the adaptation to these conditions. Under nutrient starvation, wtIDH1 oxidizes isocitrate to generate α-ketoglutarate (αKG) for anaplerosis, and NADPH to support antioxidant defense. In this study, we show that allosteric inhibitors of mutant IDH1 (mIDH1) are potent wtIDH1 inhibitors under conditions present in the TME. We demonstrate that low magnesium levels facilitate allosteric inhibition of wtIDH1, which is lethal to cancer cells when nutrients are limited. Furthermore, the FDA-approved mIDH1 inhibitor ivosidenib (AG-120) dramatically inhibited tumor growth in preclinical models of pancreatic cancer, highlighting this approach as a potential therapeutic strategy against wild-type IDH1 cancers.</p>

2022-04-29 | MTBLS4722 | MetaboLights

DNA methylation changes induced by hypomethylating agent, Azacitidine (AZA); IDH1 inhibitor, BAY1436032 (BAY) and sequential and simultaneous combination of BAY and AZA in in vitro treated human (CD45+) cells isolated from the bone marrow of IDH1mut

Project description:Mutations in the enzymes IDH1 and IDH2 have been identified in a wide variety of tumors like glioma, chondrosarcoma, thyroid cancer, lymphoma, melanoma, and in acute myeloid leukemia. Mutated IDH1/2 produces the metabolite 2-hydroxyglutarate (2HG), which interferes with epigenetic regulation of gene expression, and thus may promote tumorigenesis. Data for IDH1 inhibitors show that 30-40% of AML patients respond to monotherapy with a median duration of response of 8 months, suggesting that IDH1 inhibitors should be combined with other agents to improve efficacy. BAY 1436032 (BAY) is an oral pan-mutant IDH1 inhibitor currently undergoing phase 1 clinical trials. 5-Azacitidine (AZA) is a hypomethylating agent and can activate key epigenetically silenced pathways in AML cells, leading to an arrest of AML cell proliferation.

2020-05-25 | GSE146502 | GEO

Gene expression changes induced by hypomethylating agent, Azacitidine (AZA) ; IDH1 inhibitor, BAY1436032 (BAY) and combination of BAY and AZA in sorted human (CD45+) cells from bone marrow of IDH1mut Patient derived Xenotransplantation mice model.

2019-12-31 | GSE122428 | GEO

Gene expression changes induced by hypomethylating agent, Azacitidine (AZA); IDH1 inhibitor, BAY1436032 (BAY) and sequential and simultaneous combination of BAY and AZA in in vitro treated human (CD45+) cells isolated from the bone marrow of IDH1mut

2020-05-25 | GSE146503 | GEO

Inhibition of mutant IDH1 promotes cycling of acute myeloid leukemia stem cells [RRBS]

Project description:Acute myeloid leukemia (AML) tumors are comprised of multiple cell types with distinct capabilities to propagate the disease and resist therapy. Approximately 20% of AML patients carry gain-of-function mutations in isocitrate dehydrogenase (IDH) 1 or -2 that result in over-production of the onco-metabolite D-2-hydroxyglutarate (2-HG). Small molecule inhibitors that block 2-HG synthesis can induce complete morphological remission even in heavily pre-treated AML patients. However, almost all patients eventually relapse with analysis of clinical samples suggesting that a population of IDH mutant cells is able to persist during treatment eventually acquiring 2-HG independence and drug resistance. Herein we characterized the molecular and cellular responses to the clinical IDH1 inhibitor AG-120 (Ivosidenib) at high resolution using a novel multi-allelic mouse model of IDH1 mutant AML. We demonstrate that inhibition of mutant IDH1 exerts cell type-dependent effects on leukemic cells promoting delayed disease regression. Although single agent AG-120 treatment was not able to fully eradicate the disease, we uncovered that it increases cycling of rare leukemic stem cells (LSCs) and triggers transcriptional upregulation of the pyrimidine salvage pathway. Accordingly, AG-120 sensitized IDH1 mutant AML to the cytosine analogue hypomethylating agent azacitidine with the combination of AG-120 and azacitidine showing vastly improved efficacy in vivo. Our data highlight the impact of non-genetic heterogeneity on treatment response and provide mechanistic rationale for a drug combination that is being tested in clinical trials.

2022-08-17 | GSE201663 | GEO

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