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Targeting LSD1 rewires kinase networks and primes leukaemia cells for kinase inhibitor treatment

ABSTRACT: We show that intrinsic resistance to kinase inhibitors may be reversed by coercing kinase networks into acquiring topologies tolerant to drug sensitivity. Using acute myeloid leukaemia (AML) as a model, we found several antagonists of chromatin modifying enzymes that sensitised cancer cells to kinase inhibitor treatments.

INSTRUMENT(S): Q Exactive Plus

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Myeloblast, Peripheral Blood

DISEASE(S): Acute Myeloid Leukemia

SUBMITTER: Maruan Hijazi

LAB HEAD: Pedro Cutillas

PROVIDER: PXD018603 | Pride | 2022-04-25

REPOSITORIES: Pride

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Project description:The branched-chain amino acid (BCAA) pathway and high levels of BCAA transaminase 1 (BCAT1) have recently been associated with aggressiveness in several cancer entities. However, the mechanistic role of BCAT1 in this process remains largely uncertain. Here, by performing high-resolution proteomic analysis of human acute myeloid leukaemia (AML) stem-cell and non-stem-cell populations, we find the BCAA pathway enriched and BCAT1 protein and transcripts overexpressed in leukaemia stem cells. We show that BCAT1, which transfers α-amino groups from BCAAs to α-ketoglutarate (αKG), is a critical regulator of intracellular αKG homeostasis. Further to its role in the tricarboxylic acid cycle, αKG is an essential cofactor for αKG-dependent dioxygenases such as Egl-9 family hypoxia inducible factor 1 (EGLN1) and the ten-eleven translocation (TET) family of DNA demethylases. Knockdown of BCAT1 in leukaemia cells caused accumulation of αKG, leading to EGLN1-mediated HIF1α protein degradation. This resulted in a growth and survival defect and abrogated leukaemia-initiating potential. By contrast, overexpression of BCAT1 in leukaemia cells decreased intracellular αKG levels and caused DNA hypermethylation through altered TET activity. AML with high levels of BCAT1 (BCAT1high) displayed a DNA hypermethylation phenotype similar to cases carrying a mutant isocitrate dehydrogenase (IDHmut), in which TET2 is inhibited by the oncometabolite 2-hydroxyglutarate11,12. High levels of BCAT1 strongly correlate with shorter overall survival in IDHWTTET2WT, but not IDHmut or TET2mutAML. Gene sets characteristic for IDHmut AML13 were enriched in samples from patients with an IDHWTTET2WTBCAT1high status. BCAT1highAML showed robust enrichment for leukaemia stem-cell signatures14,15, and paired sample analysis showed a significant increase in BCAT1 levels upon disease relapse. In summary, by limiting intracellular αKG, BCAT1 links BCAA catabolism to HIF1α stability and regulation of the epigenomic landscape, mimicking the effects of IDH mutations. Our results suggest the BCAA–BCAT1–αKG pathway as a therapeutic target to compromise leukaemia stem-cell function in patients with IDHWTTET2WT AML.

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	F001423.mzid.gz	Mzid
	F001423.pride.mztab.gz	Mztab
	F001425.mzid.gz	Mzid
	F001425.pride.mztab.gz	Mztab
	F001427.mzid.gz	Mzid

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Targeting LSD1 rewires kinase networks and primes leukaemia cells for kinase inhibitor treatment

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