Dataset Information

Base excision repair-mediated resistance to cisplatin in KRAS(G12C) mutant NSCLC cells.

ABSTRACT: KRAS mutations in NSCLC are supposed to indicate a poor prognosis and poor response to anticancer treatments but this feature lacks a mechanistic basis so far. In tumors, KRAS was found to be mutated mostly at codons 12 and 13 and a pool of mutations differing in the base alteration and the amino acid substitution have been described. The different KRAS mutations may differently impact on cancerogenesis and drug sensitivity. On this basis, we hypothesized that a different KRAS mutational status in NSCLC patients determines a different profile in the tumor response to treatments. In this paper, isogenic NSCLC cell clones expressing mutated forms of KRAS were used to determine the response to cisplatin, the main drug used in the clinic against NSCLC. Cells expressing the KRAS(G12C) mutation were found to be less sensitive to treatment both in vitro and in vivo. Systematic analysis of drug uptake, DNA adduct formation and DNA damage responses implicated in cisplatin adducts removal revealed that the KRAS(G12C) mutation might be particular because it stimulates Base Excision Repair to rapidly remove platinum from DNA even before the formation of cross-links. The presented results suggest a different pattern of sensitivity/resistance to cisplatin depending on the KRAS mutational status and these data might provide proof of principle for further investigations on the role of the KRAS status as a predictor of NSCLC response.

SUBMITTER: Caiola E

PROVIDER: S-EPMC4745782 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature

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Base excision repair-mediated resistance to cisplatin in KRAS(G12C) mutant NSCLC cells.

Caiola Elisa E Salles Daniela D Frapolli Roberta R Lupi Monica M Rotella Giuseppe G Ronchi Anna A Garassino Marina Chiara MC Mattschas Nikola N Colavecchio Stefano S Broggini Massimo M Wiesmüller Lisa L Marabese Mirko M

Oncotarget 20151001 30

KRAS mutations in NSCLC are supposed to indicate a poor prognosis and poor response to anticancer treatments but this feature lacks a mechanistic basis so far. In tumors, KRAS was found to be mutated mostly at codons 12 and 13 and a pool of mutations differing in the base alteration and the amino acid substitution have been described. The different KRAS mutations may differently impact on cancerogenesis and drug sensitivity. On this basis, we hypothesized that a different KRAS mutational status ...[more]

PMID: 26353932

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Project description:Patients with non-small cell lung cancer (NSCLC) who initially respond to Sotorasib, a drug targeting the KRAS G12C mutation, eventually develop acquired resistance. However, the mechanisms driving this acquired resistance remain largely unclear. This study explored the role of AURKA in mediating resistance to Sotorasib in NSCLC. The expression levels of AURKA mRNA and protein in NSCLC cell lines (H358 and Calu-1) were assessed using qPCR and Western blot. To further elucidate the role of AURKA in the biological alterations of Sotorasib-resistant cells and its association with the PI3K/AKT signaling pathway, a comprehensive set of assays were conducted, including MTS, colony formation, Transwell migration, luciferase reporter assays, fluorescent in situ hybridization (FISH), molecular docking analyses, and immunoprecipitation. The key findings include: (1) Long-term Sotorasib treatment led to upregulation of AURKA; (2) Overexpression of AURKA induced Sotorasib resistance, suppressed apoptosis and promoted migratory potential in Calu-1 and H358 cells, while AURKA knockdown increased the sensitivity, enhanced apoptosis and inhibited migratory capacity of H358-SR and Calu-1-SR cells to Sotorasib; (3) Immunoprecipitation and luciferase reporter assays demonstrated a physical interaction between AURKA and PHB2, establishing a positive feedback loop that sustained malignant behaviors, potentially explaining how Sotorasib-resistant cells survived despite KRAS pathway inhibition; (4) AURKA stabilizes PHB2, activating the PI3K/AKT pathway and allowing cancer cells to bypass the KRAS blockade, thus restoring malignant behavior. (5) The combination of AURKA inhibitor and Sotorasib alleviates the acquired drug resistance in vitro and in vivo. These data suggest that resistance to Sotorasib in NSCLC is associated with a positive feedback loop involving AURKA, PHB2, and PI3K/AKT signaling. AURKA may serve as a biomarker for predicting the therapeutic efficacy of Sotorasib in KRAS G12C-targeted therapies and as a potential therapeutic target to overcome Sotorasib resistance in NSCLC.

Dataset Information

Base excision repair-mediated resistance to cisplatin in KRAS(G12C) mutant NSCLC cells.

Publications

Base excision repair-mediated resistance to cisplatin in KRAS(G12C) mutant NSCLC cells.

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