MutT Homolog 1 (MTH1) maintains multiple KRAS-driven pro-malignant pathways.

Abstract:

:Oncogenic RAS promotes production of reactive oxygen species (ROS), which mediate pro-malignant signaling but can also trigger DNA damage-induced tumor suppression. Thus RAS-driven tumor cells require redox-protective mechanisms to mitigate the damaging aspects of ROS. Here, we show that MutT Homolog 1 (MTH1), the mammalian 8-oxodGTPase that sanitizes oxidative damage in the nucleotide pool, is important for maintaining several KRAS-driven pro-malignant traits in a nonsmall cell lung carcinoma (NSCLC) model. MTH1 suppression in KRAS-mutant NSCLC cells impairs proliferation and xenograft tumor formation. Furthermore, MTH1 levels modulate KRAS-induced transformation of immortalized lung epithelial cells. MTH1 expression is upregulated by oncogenic KRAS and correlates positively with high KRAS levels in NSCLC human tumors. At a molecular level, in p53-competent KRAS-mutant cells, MTH1 loss provokes DNA damage and induction of oncogene-induced senescence. In p53-nonfunctional KRAS-mutant cells, MTH1 suppression does not produce DNA damage but reduces proliferation and leads to an adaptive decrease in KRAS expression levels. Thus, MTH1 not only enables evasion of oxidative DNA damage and its consequences, but can also function as a molecular rheostat for maintaining oncogene expression at optimal levels. Accordingly, our results indicate MTH1 is a novel and critical component of oncogenic KRAS-associated malignancy and its inhibition is likely to yield significant tumor-suppressive outcomes in KRAS-driven tumors.

journal_name

Oncogene

journal_title

Oncogene

authors

Patel A,Burton DG,Halvorsen K,Balkan W,Reiner T,Perez-Stable C,Cohen A,Munoz A,Giribaldi MG,Singh S,Robbins DJ,Nguyen DM,Rai P

doi

10.1038/onc.2014.195

subject

Has Abstract

pub_date

2015-05-14 00:00:00

pages

2586-96

issue

20

eissn

0950-9232

issn

1476-5594

pii

onc2014195

journal_volume

34

pub_type

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