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Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia

Somatic mutations that lead to constitutive activation of NRAS and KRAS proto-oncogenes are among the most common in human cancer and frequently occur in acute myeloid leukemia (AML). An inducible NRAS(V12)-driven AML mouse model has established a critical role for continued NRAS(V12) expression in...

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Autores principales: Pomeroy, E J, Lee, L A, Lee, R D W, Schirm, D K, Temiz, N A, Ma, J, Gruber, T A, Diaz-Flores, E, Moriarity, B S, Downing, J R, Shannon, K M, Largaespada, D A, Eckfeldt, C E
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5464975/
https://www.ncbi.nlm.nih.gov/pubmed/27991934
http://dx.doi.org/10.1038/onc.2016.471
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author Pomeroy, E J
Lee, L A
Lee, R D W
Schirm, D K
Temiz, N A
Ma, J
Gruber, T A
Diaz-Flores, E
Moriarity, B S
Downing, J R
Shannon, K M
Largaespada, D A
Eckfeldt, C E
author_facet Pomeroy, E J
Lee, L A
Lee, R D W
Schirm, D K
Temiz, N A
Ma, J
Gruber, T A
Diaz-Flores, E
Moriarity, B S
Downing, J R
Shannon, K M
Largaespada, D A
Eckfeldt, C E
author_sort Pomeroy, E J
collection PubMed
description Somatic mutations that lead to constitutive activation of NRAS and KRAS proto-oncogenes are among the most common in human cancer and frequently occur in acute myeloid leukemia (AML). An inducible NRAS(V12)-driven AML mouse model has established a critical role for continued NRAS(V12) expression in leukemia maintenance. In this model genetic suppression of NRAS(V12) expression results in rapid leukemia remission, but some mice undergo spontaneous relapse with NRAS(V12)-independent (NRI) AMLs providing an opportunity to identify mechanisms that bypass the requirement for Ras oncogene activity and drive leukemia relapse. We found that relapsed NRI AMLs are devoid of NRAS(V12) expression and signaling through the major oncogenic Ras effector pathways, phosphatidylinositol-3-kinase and mitogen-activated protein kinase, but express higher levels of an alternate Ras effector, Ralb, and exhibit NRI phosphorylation of the RALB effector TBK1, implicating RALB signaling in AML relapse. Functional studies confirmed that inhibiting CDK5-mediated RALB activation with a clinically relevant experimental drug, dinaciclib, led to potent RALB-dependent antileukemic effects in human AML cell lines, induced apoptosis in patient-derived AML samples in vitro and led to a 2-log reduction in the leukemic burden in patient-derived xenograft mice. Furthermore, dinaciclib potently suppressed the clonogenic potential of relapsed NRI AMLs in vitro and prevented the development of relapsed AML in vivo. Our findings demonstrate that Ras oncogene-independent activation of RALB signaling is a therapeutically targetable mechanism of escape from NRAS oncogene addiction in AML.
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spelling pubmed-54649752017-06-19 Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia Pomeroy, E J Lee, L A Lee, R D W Schirm, D K Temiz, N A Ma, J Gruber, T A Diaz-Flores, E Moriarity, B S Downing, J R Shannon, K M Largaespada, D A Eckfeldt, C E Oncogene Original Article Somatic mutations that lead to constitutive activation of NRAS and KRAS proto-oncogenes are among the most common in human cancer and frequently occur in acute myeloid leukemia (AML). An inducible NRAS(V12)-driven AML mouse model has established a critical role for continued NRAS(V12) expression in leukemia maintenance. In this model genetic suppression of NRAS(V12) expression results in rapid leukemia remission, but some mice undergo spontaneous relapse with NRAS(V12)-independent (NRI) AMLs providing an opportunity to identify mechanisms that bypass the requirement for Ras oncogene activity and drive leukemia relapse. We found that relapsed NRI AMLs are devoid of NRAS(V12) expression and signaling through the major oncogenic Ras effector pathways, phosphatidylinositol-3-kinase and mitogen-activated protein kinase, but express higher levels of an alternate Ras effector, Ralb, and exhibit NRI phosphorylation of the RALB effector TBK1, implicating RALB signaling in AML relapse. Functional studies confirmed that inhibiting CDK5-mediated RALB activation with a clinically relevant experimental drug, dinaciclib, led to potent RALB-dependent antileukemic effects in human AML cell lines, induced apoptosis in patient-derived AML samples in vitro and led to a 2-log reduction in the leukemic burden in patient-derived xenograft mice. Furthermore, dinaciclib potently suppressed the clonogenic potential of relapsed NRI AMLs in vitro and prevented the development of relapsed AML in vivo. Our findings demonstrate that Ras oncogene-independent activation of RALB signaling is a therapeutically targetable mechanism of escape from NRAS oncogene addiction in AML. Nature Publishing Group 2017-06-08 2016-12-19 /pmc/articles/PMC5464975/ /pubmed/27991934 http://dx.doi.org/10.1038/onc.2016.471 Text en Copyright © 2017 The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Original Article
Pomeroy, E J
Lee, L A
Lee, R D W
Schirm, D K
Temiz, N A
Ma, J
Gruber, T A
Diaz-Flores, E
Moriarity, B S
Downing, J R
Shannon, K M
Largaespada, D A
Eckfeldt, C E
Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia
title Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia
title_full Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia
title_fullStr Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia
title_full_unstemmed Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia
title_short Ras oncogene-independent activation of RALB signaling is a targetable mechanism of escape from NRAS(V12) oncogene addiction in acute myeloid leukemia
title_sort ras oncogene-independent activation of ralb signaling is a targetable mechanism of escape from nras(v12) oncogene addiction in acute myeloid leukemia
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5464975/
https://www.ncbi.nlm.nih.gov/pubmed/27991934
http://dx.doi.org/10.1038/onc.2016.471
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