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- Title
TDP1 and TOP1 Modulation in Olaparib-Resistant Cancer Determines the Efficacy of Subsequent Chemotherapy.
- Authors
Kim, Jin Won; Min, Ahrum; Im, Seock-Ah; Jang, Hyemin; Kim, Yu Jin; Kim, Hee-Jun; Lee, Kyung-Hun; Kim, Tae-Yong; Lee, Keun Wook; Oh, Do-Youn; Kim, Jee-Hyun; Bang, Yung-Jue
- Abstract
The aim of this study was to elucidate the carryover effect of olaparib to subsequent chemotherapy and its underlying mechanisms. We generated olaparib-resistant SNU-484, SNU-601, SNU-668, and KATO-III gastric cancer cell lines and confirmed their resistance by cell viability and colony forming assays. Notably, olaparib-resistant cell lines displayed cross-resistance to cisplatin except for KATO-III. Inversely, olaparib-resistant SNU-484, SNU-668, and KATO-III were more sensitive to irinotecan than their parental cells. However, sensitivity to paclitaxel remained unaltered. There were compensatory changes in the ATM/ATR axis and p-Chk1/2 protein expression. ERCC1 was also induced in olaparib-resistant SNU-484, SNU-601, and SNU-668, which showed cross-resistance to cisplatin. Olaparib-resistant cells showed tyrosyl-DNA phosphodiesterase 1 (TDP1) downregulation with higher topoisomerase 1 (TOP1) activity, which is a target of irinotecan. These changes of TOP1 and TDP1 in olaparib-resistant cells was confirmed as the underlying mechanism for increased irinotecan sensitivity through manipulated gene expression of TOP1 and TDP1 by specific plasmid transfection and siRNA. The patient-derived xenograft model established from the patient who acquired resistance to olaparib with BRCA2 mutation showed increased sensitivity in irinotecan. In conclusion, the carryover effects of olaparib to improve antitumor effect of subsequent irinotecan were demonstrated. These effects should be considered when determining the subsequent therapy with olaparib.
- Subjects
OLAPARIB; ENZYME metabolism; BIOCHEMISTRY; CANCER chemotherapy; CELL lines; DRUG resistance in cancer cells; ESTERASES; GENE expression; GENETIC techniques; HETEROCYCLIC compounds; PHENOMENOLOGY; PLASMIDS; STOMACH tumors; IRINOTECAN
- Publication
Cancers, 2020, Vol 12, Issue 2, p334
- ISSN
2072-6694
- Publication type
Article
- DOI
10.3390/cancers12020334