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Ref Type Journal Article
PMID (27638859)
Authors Subhash VV, Tan SH, Yeo MS, Yan FL, Peethala PC, Liem N, Krishnan V, Yong WP
Title ATM Expression Predicts Veliparib and Irinotecan Sensitivity in Gastric Cancer by Mediating P53-Independent Regulation of Cell Cycle and Apoptosis.
Journal Molecular cancer therapeutics
Vol 15
Issue 12
Date 2016 Dec
URL
Abstract Text Identification of synthetically lethal cellular targets and synergistic drug combinations is important in cancer chemotherapy as they help to overcome treatment resistance and increase efficacy. The Ataxia Telangiectasia Mutated (ATM) kinase is a nuclear protein that plays a major role in the initiation of DNA repair signaling and cell-cycle check points during DNA damage. Although ATM was shown to be associated with poor prognosis in gastric cancer, its implications as a predictive biomarker for cancer chemotherapy remain unexplored. The present study evaluated ATM-induced synthetic lethality and its role in sensitization of gastric cancer cells to PARP and TOP1 inhibitors, veliparib (ABT-888) and irinotecan (CPT-11), respectively. ATM expression was detected in a panel of gastric cell lines, and the IC50 against each inhibitors was determined. The combinatorial effect of ABT-888 and CPT-11 in gastric cancer cells was also determined both in vitro and in vivo ATM deficiency was found to be associated with enhanced sensitivity to ABT-888 and CPT-11 monotherapy, hence suggesting a mechanism of synthetic lethality. Cells with high ATM expression showed reduced sensitivity to monotherapy; however, they showed a higher therapeutic effect with ABT-888 and CPT-11 combinatorial therapy. Furthermore, ATM expression was shown to play a major role in cellular homeostasis by regulating cell-cycle progression and apoptosis in a P53-independent manner. The present study highlights the clinical utility of ATM expression as a predictive marker for sensitivity of gastric cancer cells to PARP and TOP1 inhibition and provides a deeper mechanistic insight into ATM-dependent regulation of cellular processes. Mol Cancer Ther; 15(12); 3087-96. ©2016 AACR.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
ATM over exp stomach cancer decreased response Veliparib Preclinical - Cell culture Actionable In a preclinical study, high ATM expression was associated with decreased response to Veliparib (ABT-888) in gastric cancer cell lines in culture (PMID: 27638859). 27638859
ATM dec exp stomach cancer sensitive Veliparib Preclinical - Cell line xenograft Actionable In a preclinical study, knockdown of ATM in a gastric cancer cell line resulted in increased sensitivity to Veliparib (ABT-888) in culture and in xenograft models (PMID: 27638859). 27638859
ATM over exp stomach cancer decreased response Irinotecan Preclinical - Cell culture Actionable In a preclinical study, high ATM expression was associated with decreased response to Camptosaur (irinotecan) in gastric cancer cell lines in culture (PMID: 27638859). 27638859
ATM over exp stomach cancer sensitive Irinotecan + Veliparib Preclinical - Cell line xenograft Actionable In a preclinical study, the combination of Camptosar (irinotecan) and Veliparib (ABT-888) demonstrated synergy in gastric cancer cell lines with high ATM expression, resulting in increased apoptosis in culture, and enhanced tumor growth inhibition in cell line xenograft models (PMID: 27638859). 27638859