Loss of EZH2 Reprograms BCAA Metabolism to Drive Leukemic Transformation

Epigenetic gene regulation and metabolism are highly intertwined, yet little is known about whether altered epigenetics influence cellular metabolism during cancer progression. Here, we show that EZH2 and NRAS mutations cooperatively induce progression of myeloproliferative neoplasms to highly penet...

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Veröffentlicht in:Cancer discovery 2019-09, Vol.9 (9), p.1228-1247
Hauptverfasser: Gu, Zhimin, Liu, Yuxuan, Cai, Feng, Patrick, McKenzie, Zmajkovic, Jakub, Cao, Hui, Zhang, Yuannyu, Tasdogan, Alpaslan, Chen, Mingyi, Qi, Le, Liu, Xin, Li, Kailong, Lyu, Junhua, Dickerson, Kathryn E, Chen, Weina, Ni, Min, Merritt, Matthew E, Morrison, Sean J, Skoda, Radek C, DeBerardinis, Ralph J, Xu, Jian
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container_end_page 1247
container_issue 9
container_start_page 1228
container_title Cancer discovery
container_volume 9
creator Gu, Zhimin
Liu, Yuxuan
Cai, Feng
Patrick, McKenzie
Zmajkovic, Jakub
Cao, Hui
Zhang, Yuannyu
Tasdogan, Alpaslan
Chen, Mingyi
Qi, Le
Liu, Xin
Li, Kailong
Lyu, Junhua
Dickerson, Kathryn E
Chen, Weina
Ni, Min
Merritt, Matthew E
Morrison, Sean J
Skoda, Radek C
DeBerardinis, Ralph J
Xu, Jian
description Epigenetic gene regulation and metabolism are highly intertwined, yet little is known about whether altered epigenetics influence cellular metabolism during cancer progression. Here, we show that EZH2 and NRAS mutations cooperatively induce progression of myeloproliferative neoplasms to highly penetrant, transplantable, and lethal myeloid leukemias in mice. EZH1, an EZH2 homolog, is indispensable for EZH2-deficient leukemia-initiating cells and constitutes an epigenetic vulnerability. BCAT1, which catalyzes the reversible transamination of branched-chain amino acids (BCAA), is repressed by EZH2 in normal hematopoiesis and aberrantly activated in EZH2-deficient myeloid neoplasms in mice and humans. BCAT1 reactivation cooperates with NRAS to sustain intracellular BCAA pools, resulting in enhanced mTOR signaling in EZH2-deficient leukemia cells. Genetic and pharmacologic inhibition of BCAT1 selectively impairs EZH2-deficient leukemia-initiating cells and constitutes a metabolic vulnerability. Hence, epigenetic alterations rewire intracellular metabolism during leukemic transformation, causing epigenetic and metabolic vulnerabilities in cancer-initiating cells. SIGNIFICANCE: EZH2 inactivation and oncogenic NRAS cooperate to induce leukemic transformation of myeloproliferative neoplasms by activating BCAT1 to enhance BCAA metabolism and mTOR signaling. We uncover a mechanism by which epigenetic alterations rewire metabolism during cancer progression, causing epigenetic and metabolic liabilities in cancer-initiating cells that may be exploited as potential therapeutics. . .
doi_str_mv 10.1158/2159-8290.cd-19-0152
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Here, we show that EZH2 and NRAS mutations cooperatively induce progression of myeloproliferative neoplasms to highly penetrant, transplantable, and lethal myeloid leukemias in mice. EZH1, an EZH2 homolog, is indispensable for EZH2-deficient leukemia-initiating cells and constitutes an epigenetic vulnerability. BCAT1, which catalyzes the reversible transamination of branched-chain amino acids (BCAA), is repressed by EZH2 in normal hematopoiesis and aberrantly activated in EZH2-deficient myeloid neoplasms in mice and humans. BCAT1 reactivation cooperates with NRAS to sustain intracellular BCAA pools, resulting in enhanced mTOR signaling in EZH2-deficient leukemia cells. Genetic and pharmacologic inhibition of BCAT1 selectively impairs EZH2-deficient leukemia-initiating cells and constitutes a metabolic vulnerability. Hence, epigenetic alterations rewire intracellular metabolism during leukemic transformation, causing epigenetic and metabolic vulnerabilities in cancer-initiating cells. SIGNIFICANCE: EZH2 inactivation and oncogenic NRAS cooperate to induce leukemic transformation of myeloproliferative neoplasms by activating BCAT1 to enhance BCAA metabolism and mTOR signaling. 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source MEDLINE; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; American Association for Cancer Research
subjects Amino Acids, Branched-Chain - metabolism
Animals
Enhancer of Zeste Homolog 2 Protein - genetics
Enhancer of Zeste Homolog 2 Protein - metabolism
GTP Phosphohydrolases - genetics
Humans
Leukemia - genetics
Leukemia - metabolism
Leukemia - pathology
Membrane Proteins - genetics
Mice
Mutation
Myeloproliferative Disorders - complications
Myeloproliferative Disorders - genetics
Myeloproliferative Disorders - metabolism
Neoplasm Transplantation
Signal Transduction
TOR Serine-Threonine Kinases - metabolism
Transaminases - metabolism
title Loss of EZH2 Reprograms BCAA Metabolism to Drive Leukemic Transformation
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