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Published in: Investigational New Drugs 5/2019

01-10-2019 | Colorectal Cancer | PRECLINICAL STUDIES

Sensitization of colorectal cancer to irinotecan therapy by PARP inhibitor rucaparib

Authors: Titto Augustine, Radhashree Maitra, Jinghang Zhang, Jay Nayak, Sanjay Goel

Published in: Investigational New Drugs | Issue 5/2019

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Summary

Intended to explore synthetic lethality and develop better combinatorial regimens, we screened colorectal cancer (CRC) cells using poly ADP-ribose (PAR) polymerase (PARP) inhibitors and cytotoxic agents. We studied four PARP inhibitors and three DNA-damaging agents, and their combinations using sulforhodamine B assay. Rucaparib demonstrated the greatest synergy with irinotecan, followed by olaparib and PJ34. Rucaparib and irinotecan was further subjected to detailed examination to determine combination index (CI) and underlying mechanism of action. Effectiveness and sequence dependence of this combination were assessed in microsatellite stable (MSS) and unstable (MSI) CRC and HCT116 isogenic cell lines. The degree of cell cycle arrest and apoptosis was determined by FACS. In vivo studies were performed to confirm efficacy of this combination. PAR levels in MSI and PARP expression in MSI and MSS cell lines were diminished upon combinatorial treatment. HCT116 isogenic cells revealed the importance of p21, p53 and PTEN in exerting synergy. In MSI cells, administration of rucaparib prior to irinotecan enhanced cytotoxicity compared to other strategies explored. FACS revealed S-phase arrest and increased late-stage apoptosis in MSS, and G2-M arrest and total and early-stage apoptosis in MSI cells. In in vivo murine xenograft models, a significant reduction in tumor volume and expression of Ki67, pancytokeratin and RPS6KB1, and increase in expression of caspase 3 were observed with the combination. In conclusion, among the various combinations studied, rucaparib plus irinotecan was the most synergistic one. Alterations in cell cycle arrest and apoptosis were dependent on MSI status in CRC cells.
Literature
14.
go back to reference Shirasawa S, Furuse M, Yokoyama N, Sasazuki T (1993) Altered growth of human colon cancer cell lines disrupted at activated Ki-ras. Science 260(5104):85–88CrossRef Shirasawa S, Furuse M, Yokoyama N, Sasazuki T (1993) Altered growth of human colon cancer cell lines disrupted at activated Ki-ras. Science 260(5104):85–88CrossRef
17.
go back to reference Ross DT, Scherf U, Eisen MB, Perou CM, Rees C, Spellman P, Iyer V, Jeffrey SS, Van de Rijn M, Waltham M, Pergamenschikov A, Lee JC, Lashkari D, Shalon D, Myers TG, Weinstein JN, Botstein D, Brown PO (2000) Systematic variation in gene expression patterns in human cancer cell lines. Nat Genet 24(3):227–235. https://doi.org/10.1038/73432 CrossRefPubMed Ross DT, Scherf U, Eisen MB, Perou CM, Rees C, Spellman P, Iyer V, Jeffrey SS, Van de Rijn M, Waltham M, Pergamenschikov A, Lee JC, Lashkari D, Shalon D, Myers TG, Weinstein JN, Botstein D, Brown PO (2000) Systematic variation in gene expression patterns in human cancer cell lines. Nat Genet 24(3):227–235. https://​doi.​org/​10.​1038/​73432 CrossRefPubMed
21.
go back to reference Palma JP, Rodriguez LE, Bontcheva-Diaz VD, Bouska JJ, Bukofzer G, Colon-Lopez M, Guan R, Jarvis K, Johnson EF, Klinghofer V, Liu X, Olson A, Saltarelli MJ, Shi Y, Stavropoulos JA, Zhu GD, Penning TD, Luo Y, Giranda VL, Rosenberg SH, Frost DJ, Donawho CK (2008) The PARP inhibitor, ABT-888 potentiates temozolomide: correlation with drug levels and reduction in PARP activity in vivo. Anticancer Res 28(5A):2625–2635PubMed Palma JP, Rodriguez LE, Bontcheva-Diaz VD, Bouska JJ, Bukofzer G, Colon-Lopez M, Guan R, Jarvis K, Johnson EF, Klinghofer V, Liu X, Olson A, Saltarelli MJ, Shi Y, Stavropoulos JA, Zhu GD, Penning TD, Luo Y, Giranda VL, Rosenberg SH, Frost DJ, Donawho CK (2008) The PARP inhibitor, ABT-888 potentiates temozolomide: correlation with drug levels and reduction in PARP activity in vivo. Anticancer Res 28(5A):2625–2635PubMed
23.
go back to reference Vermes I, Haanen C, Reutelingsperger C (2000) Flow cytometry of apoptotic cell death. J Immunol Methods 243(1–2):167–190CrossRefPubMed Vermes I, Haanen C, Reutelingsperger C (2000) Flow cytometry of apoptotic cell death. J Immunol Methods 243(1–2):167–190CrossRefPubMed
35.
37.
go back to reference Strumberg D, Pilon AA, Smith M, Hickey R, Malkas L, Pommier Y (2000) Conversion of topoisomerase I cleavage complexes on the leading strand of ribosomal DNA into 5′-phosphorylated DNA double-strand breaks by replication runoff. Mol Cell Biol 20(11):3977–3987CrossRefPubMedPubMedCentral Strumberg D, Pilon AA, Smith M, Hickey R, Malkas L, Pommier Y (2000) Conversion of topoisomerase I cleavage complexes on the leading strand of ribosomal DNA into 5′-phosphorylated DNA double-strand breaks by replication runoff. Mol Cell Biol 20(11):3977–3987CrossRefPubMedPubMedCentral
Metadata
Title
Sensitization of colorectal cancer to irinotecan therapy by PARP inhibitor rucaparib
Authors
Titto Augustine
Radhashree Maitra
Jinghang Zhang
Jay Nayak
Sanjay Goel
Publication date
01-10-2019
Publisher
Springer US
Published in
Investigational New Drugs / Issue 5/2019
Print ISSN: 0167-6997
Electronic ISSN: 1573-0646
DOI
https://doi.org/10.1007/s10637-018-00717-9

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