Targeting the DNA replication stress phenotype of KRAS mutant cancer cells
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Targeting the DNA replication stress phenotype of KRAS mutant cancer cells. / Al Zubaidi, Tara; Gehrisch, O H Fiete; Genois, Marie-Michelle; Liu, Qi; Lu, Shan; Kung, Jong; Xie, Yunhe; Schuemann, Jan; Lu, Hsiao-Ming; Hata, Aaron N; Zou, Lee; Borgmann, Kerstin; Willers, Henning.
in: SCI REP-UK, Jahrgang 11, Nr. 1, 3656, 11.02.2021.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Targeting the DNA replication stress phenotype of KRAS mutant cancer cells
AU - Al Zubaidi, Tara
AU - Gehrisch, O H Fiete
AU - Genois, Marie-Michelle
AU - Liu, Qi
AU - Lu, Shan
AU - Kung, Jong
AU - Xie, Yunhe
AU - Schuemann, Jan
AU - Lu, Hsiao-Ming
AU - Hata, Aaron N
AU - Zou, Lee
AU - Borgmann, Kerstin
AU - Willers, Henning
PY - 2021/2/11
Y1 - 2021/2/11
N2 - Mutant KRAS is a common tumor driver and frequently confers resistance to anti-cancer treatments such as radiation. DNA replication stress in these tumors may constitute a therapeutic liability but is poorly understood. Here, using single-molecule DNA fiber analysis, we first characterized baseline replication stress in a panel of unperturbed isogenic and non-isogenic cancer cell lines. Correlating with the observed enhanced replication stress we found increased levels of cytosolic double-stranded DNA in KRAS mutant compared to wild-type cells. Yet, despite this phenotype replication stress-inducing agents failed to selectively impact KRAS mutant cells, which were protected by CHK1. Similarly, most exogenous stressors studied did not differentially augment cytosolic DNA accumulation in KRAS mutant compared to wild-type cells. However, we found that proton radiation was able to slow fork progression and preferentially induce fork stalling in KRAS mutant cells. Proton treatment also partly reversed the radioresistance associated with mutant KRAS. The cellular effects of protons in the presence of KRAS mutation clearly contrasted that of other drugs affecting replication, highlighting the unique nature of the underlying DNA damage caused by protons. Taken together, our findings provide insight into the replication stress response associated with mutated KRAS, which may ultimately yield novel therapeutic opportunities.
AB - Mutant KRAS is a common tumor driver and frequently confers resistance to anti-cancer treatments such as radiation. DNA replication stress in these tumors may constitute a therapeutic liability but is poorly understood. Here, using single-molecule DNA fiber analysis, we first characterized baseline replication stress in a panel of unperturbed isogenic and non-isogenic cancer cell lines. Correlating with the observed enhanced replication stress we found increased levels of cytosolic double-stranded DNA in KRAS mutant compared to wild-type cells. Yet, despite this phenotype replication stress-inducing agents failed to selectively impact KRAS mutant cells, which were protected by CHK1. Similarly, most exogenous stressors studied did not differentially augment cytosolic DNA accumulation in KRAS mutant compared to wild-type cells. However, we found that proton radiation was able to slow fork progression and preferentially induce fork stalling in KRAS mutant cells. Proton treatment also partly reversed the radioresistance associated with mutant KRAS. The cellular effects of protons in the presence of KRAS mutation clearly contrasted that of other drugs affecting replication, highlighting the unique nature of the underlying DNA damage caused by protons. Taken together, our findings provide insight into the replication stress response associated with mutated KRAS, which may ultimately yield novel therapeutic opportunities.
KW - Cell Line, Tumor
KW - Cell Proliferation/radiation effects
KW - DNA/genetics
KW - DNA Damage/radiation effects
KW - DNA Replication/genetics
KW - Humans
KW - Mutation/radiation effects
KW - Neoplasms/genetics
KW - Proto-Oncogene Proteins p21(ras)/genetics
KW - Protons/adverse effects
KW - Radiation Tolerance/genetics
KW - Single Molecule Imaging
U2 - 10.1038/s41598-021-83142-y
DO - 10.1038/s41598-021-83142-y
M3 - SCORING: Journal article
C2 - 33574444
VL - 11
JO - SCI REP-UK
JF - SCI REP-UK
SN - 2045-2322
IS - 1
M1 - 3656
ER -