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Synergistic Anti-Leukemic Effect Of Trc105 And Decitabine In AML Xenografts

ABSTRACT: Synergistic Anti-Leukemic Effect Of Trc105 And Decitabine In AML Xenografts

PROVIDER: PRJNA614994 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR11410446_1.fastq.gz	Fastqsanger.gz
	SRR11410446_2.fastq.gz	Fastqsanger.gz
	SRR11410447_1.fastq.gz	Fastqsanger.gz
	SRR11410447_2.fastq.gz	Fastqsanger.gz
	SRR11410448_1.fastq.gz	Fastqsanger.gz

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Synergistic Anti-Leukemic Effect Of Trc105 And Decitabine In AML Xenografts

Project description:Acute myeloid leukemia (AML) is an aggressive hematologic malignancy, often characterized by poor prognosis following standard induction therapy. The DNA methyltransferase inhibitor decitabine (DAC) is an alternative to intensive chemotherapy in elderly and relapsed/refractory AML patients. Despite some efficacy, DAC monotherapy does not promote complete remission and overall survival rates are very poor. Therefore, novel therapeutic regimens for AML are warranted. CD105 (endoglin), a receptor for the TGF-β superfamily, is expressed in various hematopoietic malignancies, including AML in which high expression correlates with poor prognosis. We have recently demonstrated that targeting CD105+ AML blasts with the TRC105 monoclonal antibody abrogates leukemogenesis in vivo. Based on these encouraging findings, here we investigated whether TRC105 in combination with DAC could represent a novel therapeutic option to treat relapsed/refractory AML. Treatment of leukemic mice with DAC in combination with TRC105 resulted in superior survival and significant reduction of leukemia burden in the bone marrow (BM) of AML xenografts compared to DAC monotherapy. To determine if TRC105 anti-leukemogenic effect is mediated by NK cells, we performed in vitro and in vivo studies. In the latter, we tested TRC105 in the context of NK depletion by injecting mice with an antibody to CD122. TRC105 treatment resulted in comparable reduction of leukemia burden in xenografts regardless of NK depletion, demonstrating that the anti-leukemogenic effect of TRC105 in AML is independent of NK cells. Altogether, our findings provide proof-of-principle for the clinical evaluation of TRC105 in combination with DAC in AML patients.

2020-10-27 | GSE147503 | GEO

Transcriptional profile of AML xenografts treated with either PBS or a combination of decitabine and cytarabine

Project description:The Affymetrix Human Genome U133 Plus 2.0 Array was used to examine the Genome wide transcriptional changes which follow the treatment of AML xenografts with either PBS control or combination of decitabine (DAC) and cytarabine (Ara-C). Animals were treated with PBS, DAC alone, Ara-C alone, DAC and Ara-C combined (D+A), DAC followed by Ara-C (D/A) or Ara-C followed by DAC (A/D). PBS vs each drug combination

2013-03-06 | E-GEOD-44857 | biostudies-arrayexpress

Transcriptional profile of AML xenografts treated with either PBS or a combination of decitabine and cytarabine

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Mechanism of initial favourable response to decitabine in TP53 mutated MDS/AML and potential mechanisms of subsequent relapses

Project description:Myelodysplastic syndrome (MDS) and acute myeloid leukemia (AML) with complex and monosomy karyotype (CK/MK) show high prevalence of TP53 mutations, poor response to induction chemotherapy and adverse patient outcome. These diseases may respond to decitabine but the mechanisms are presently unclear. MDS/AML patients were treated with decitabine for 10 days in a Phase II clinical study. In this study, we collected serial samples from patients before and at completion of decitabine treatment, morphologic remission and relapse. The samples were interrogated with targeted myeloid panel sequencing, nanopore DNA cytosine methylation sequencing and single-cell transcriptomics to investigate potential interactions between leukemic and immune populations. The integrative analysis allowed characterization of shifting dynamics within leukemic and immune cell populations in individual patients. Comparison of these trends between TP53 mutated MDS/AML patients who responded to treatment versus TP53 wildtype patients who were refractory to treatment highlighted the complex interplay of leukemic and immune compartments. Single cell transcriptomic analyses confirmed immune activation in TP53m responders after decitabine treatment. At relapse, leukemic populations showed up-regulation of MYC signaling and heat shock response while T-cells showed exhaustion signature. Our work highlighted the complex interplay between leukemic and immune populations in TP53m patients upon decitabine treatment that might account for clinical responses and subsequent relapses.

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Decitabine alters DNA methylation in AML patients

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Project description:The heterogeneity of leukemic cells is the main cause of resistance to therapy in acute myeloid leukemia (AML). Consequently, innovative therapeutic approaches are critical to target a wide spectrum of leukemic clones, regardless of their genetic and non-genetic complexity. In this report, we leverage the vulnerability of AML cells to CDK6 to identify a combination therapy capable of targeting common biological processes shared by all leukemic cells, while sparing non-transformed cells. We demonstrate that the combined inhibition of CDK6 and LSD1 restores myeloid differentiation and depletes the leukemic progenitor compartment in AML samples. Mechanistically, this combination induces major changes in chromatin accessibility, leading to the transcription of differentiation genes and diminished LSC signatures. Remarkably, the combination is synergistic, induces durable changes in the cells, and is effective in PDX mouse models. While many AML samples exhibit only modest responses to LSD1 inhibition, co-targeting CDK6 restores the expected transcription response associated with LSD1 inhibition. Given the availability of clinical-grade CDK6 and LSD1 inhibitors, this combination holds significant potential for implementation in clinical settings through drug repositioning.

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