Transcriptomic changes induced by allosteric inhibitor RMC-4550 in FLT3 and KIT mutant human AML cell lines
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA898605 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR22198900.fastq.gz | Fastqsanger.gz | |||
| SRR22198901.fastq.gz | Fastqsanger.gz | |||
| SRR22198902.fastq.gz | Fastqsanger.gz | |||
| SRR22198903.fastq.gz | Fastqsanger.gz | |||
| SRR22198904.fastq.gz | Fastqsanger.gz |
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Project description:Targeting the MAPK signaling is an effective therapeutic approach in acute myeloid leukemia (AML) with mutations in FLT3 and KIT tyrosine kinase receptors. SHP2 is a central node in the MAPK signaling pathway and SHP2 inhibition was shown to supress leukemia proliferation in vitro and in vivo. In order to investigate the gene expression alterations induced by allosteric SHP2 inhibition and identify potential co-targets for pharmacological inhibition, we treated three human FLT3 and KIT mutant AML cell lines with RMC-4550 and performed RNAseq.
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Project description:The protein tyrosine phosphatase SHP2 is crucial for oncogenic transformation of acute myeloid leukemia (AML) cells expressing mutated receptor tyrosine kinases (RTKs), as it is required for full RAS-ERK activation to promote cell proliferation and survival programs. SHP2 allosteric inhibitors act by stabilizing SHP2 in its auto-inhibited conformation and they are currently being tested in clinical trials for tumors with over-activation of the RAS/ERK pathway, alone and in various drug combinations. Using in vitro models, we established acquired resistant cell lines to the allosteric SHP2 inhibitor SHP099 from two FLT3-ITD-positive AML cell lines. We performed both label-free and isobaric labeling quantitative mass spectrometry-based phosphoproteomics to reveal that AML cells can restore phosphorylated ERK (pERK) in presence of SHP099, thus developing adaptive resistance. Mechanistically, SHP2 inhibition induces the tyrosine phosphorylation and feedback-activation of the FLT3 receptor, which in turn phosphorylates SHP2 on Tyrosine 62. This phosphorylation stabilizes SHP2 in its open conformation, preventing SHP099 binding, thus resulting in resistance. Combinatorial inhibition of SHP2 and MEK or SHP2 and FLT3 prevents pERK rebound and resistant cell growth. We observed the same mechanism in a FLT3-mutated B-ALL cell line and in the inv(16)/KITD816Y AML mouse model. Finally, we show that allosteric SHP2 inhibition does not impair the clonogenic ability of normal bone marrow progenitors, supporting its future use for clinical applications.
2023-03-10 | PXD030338 | Pride
Project description:Acute Myeloid Leukaemia (AML) carries a 5 year survival rate of just 24%. Toxic chemotherapy regimens remain the backbone of standard of care for AML. The KIT tyrosine kinase is a recognised AML oncogene, associated with poor outcome. We recently identified DNA-PK as a novel therapeutic target in FLT3 mutant AML. The similarity between KIT and FLT3 regulated signalling pathways led us to investigate DNA-PK in KIT-mutant AML.
2023-01-26 | PXD030005 | Pride
Project description:CircMYBL2 is more highly expressed in AML patients with FLT3-ITD mutations than in those without the FLT3-ITD mutation. We found that circMYBL2 knockdown specifically inhibits proliferation and promotes the differentiation of FLT3-ITD AML cells in vitro and in vivo. We used the ribosome profiling and RNA-seq libraries sequenced with Illumina HiSeq 2500 to identify the mRNA that circMYBL2 targeted. Interestingly, we found that circMYBL2 significantly influences the protein level of mutant FLT3 kinase, which contributes to the activation of FLT3-ITD-dependent signaling pathways. Mechanistically, circMYBL2 enhanced the translational efficiency of FLT3 kinase by increasing the binding of PTBP1 to FLT3 mRNA. Moreover, circMYBL2 knockdown impaired the cytoactivity of inhibitor-resistant FLT3-ITD-positive cells, with a significant decrease in FLT3 kinase expression, followed by the inactivation of its downstream pathways. In summary, we are the first to reveal a circRNA that specifically influences FLT3-ITD AML and regulates FLT3 kinase levels through translational regulation, suggesting that circMYBL2 may be a potential therapeutic target for FLT3-ITD AML.
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Project description:Ceramide Transfer Protein (CERT) determines the ratio of ceramide and Sphingomyelin in cells. Targeting CERT sensitizes solid cancer cells to chemotherapy. However, the role of CERT in AML remains elusive. Knockdown CERT or its inhibitor HPA-12 inhibited growth and promoted apoptosis in AML cells carrying FLT3-ITD mutation. HPA-12 alone or with the FLT3 inhibitor Crenolanib synergistically inhibited proliferation and triggered apoptosis in FLT3-ITD mutated AML cells in vitro and in vivo. Interestingly, co-treatment of HPA-12 and Crenolanib is effective in FLT3-ITD+ and FLT3-TKD+ AML patients. The synergistic effects were mediated by the endoplasmic reticulum (ER) stress-GRP78/ATF6/CHOP axis and mitophagy. Our data suggest a possible strategy to enhance the efficacy of FLT3 inhibitors in AML.
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Project description:In this study, we screened a group of newly synthesized tyrosine kinase inhibitors, and discovered MZH29 was a potent FLT3 inhibitor. Remarkably, MZH29 is well tolerated and effective in the clinically known FLT3 mutants in the constructed BaF3 model cells. MZH29 could also lead to complete tumor regression in the mouse xenograft model and increases survival in the bone marrow engraftment model. Further proteomics study indicates that the inhibition effects of MZH29 and AC220 are in a similar manner. All the results present here support that MZH29 could be a promising candidate for both the FLT3 WT and drug resistance mutant AML.
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