Publication Date:
2009-09-04
Description:
The cascade comprising Raf, mitogen-activated protein kinase kinase (MEK) and extracellular signal-regulated kinase (ERK) is a therapeutic target in human cancers with deregulated Ras signalling, which includes tumours that have inactivated the Nf1 tumour suppressor. Nf1 encodes neurofibromin, a GTPase-activating protein that terminates Ras signalling by stimulating hydrolysis of Ras-GTP. We compared the effects of inhibitors of MEK in a myeloproliferative disorder (MPD) initiated by inactivating Nf1 in mouse bone marrow and in acute myeloid leukaemias (AMLs) in which cooperating mutations were induced by retroviral insertional mutagenesis. Here we show that MEK inhibitors are ineffective in MPD, but induce objective regression of many Nf1-deficient AMLs. Drug resistance developed because of outgrowth of AML clones that were present before treatment. We cloned clone-specific retroviral integrations to identify candidate resistance genes including Rasgrp1, Rasgrp4 and Mapk14, which encodes p38alpha. Functional analysis implicated increased RasGRP1 levels and reduced p38 kinase activity in resistance to MEK inhibitors. This approach represents a robust strategy for identifying genes and pathways that modulate how primary cancer cells respond to targeted therapeutics and for probing mechanisms of de novo and acquired resistance.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119783/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4119783/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lauchle, Jennifer O -- Kim, Doris -- Le, Doan T -- Akagi, Keiko -- Crone, Michael -- Krisman, Kimberly -- Warner, Kegan -- Bonifas, Jeannette M -- Li, Qing -- Coakley, Kristen M -- Diaz-Flores, Ernesto -- Gorman, Matthew -- Przybranowski, Sally -- Tran, Mary -- Kogan, Scott C -- Roose, Jeroen P -- Copeland, Neal G -- Jenkins, Nancy A -- Parada, Luis -- Wolff, Linda -- Sebolt-Leopold, Judith -- Shannon, Kevin -- K08 CA119105/CA/NCI NIH HHS/ -- K08 CA119105-01A1/CA/NCI NIH HHS/ -- K08 CA119105-02/CA/NCI NIH HHS/ -- K08 CA119105-03/CA/NCI NIH HHS/ -- K08 CA119105-04/CA/NCI NIH HHS/ -- R37 CA072614/CA/NCI NIH HHS/ -- R37 CA072614-11/CA/NCI NIH HHS/ -- R37 CA072614-12/CA/NCI NIH HHS/ -- R37 CA072614-13/CA/NCI NIH HHS/ -- R37 CA72614/CA/NCI NIH HHS/ -- T32 CA09043/CA/NCI NIH HHS/ -- T32HD044331/HD/NICHD NIH HHS/ -- U01 CA084221/CA/NCI NIH HHS/ -- U01 CA084221-06/CA/NCI NIH HHS/ -- U01 CA084221-07/CA/NCI NIH HHS/ -- U01 CA084221-08/CA/NCI NIH HHS/ -- U01 CA084221-09/CA/NCI NIH HHS/ -- U01 CA084221-10/CA/NCI NIH HHS/ -- U01 CA84221/CA/NCI NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2009 Sep 17;461(7262):411-4. doi: 10.1038/nature08279. Epub 2009 Sep 2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatrics, University of California, San Francisco, California 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19727076" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Benzamides/pharmacology
;
*Drug Resistance, Neoplasm/drug effects/genetics
;
Genes, ras
;
Guanine Nucleotide Exchange Factors/genetics/metabolism
;
Leukemia, Myeloid, Acute/*drug therapy/enzymology/genetics/*metabolism
;
Mice
;
Mitogen-Activated Protein Kinase 14/genetics/metabolism
;
Mitogen-Activated Protein Kinase Kinases/*antagonists & inhibitors/metabolism
;
ras Proteins/genetics/*metabolism
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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