Nanoencapsulation of Novel Inhibitors of PNKP for Selective Sensitization to Ionizing Radiation and Irinotecan and Induction of Synthetic Lethality
| Autor: | Michael Weinfeld, Afsaneh Lavasanifar, Mohammad Reza Vakili, Timothy D. R. Morgan, Dennis G. Hall, Zahra Shire |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
DNA Repair Polynucleotide Kinase DNA repair medicine.medical_treatment Drug Compounding Phosphatase Pharmaceutical Science Synthetic lethality Irinotecan 03 medical and health sciences chemistry.chemical_compound Nanocapsules Piperidines Radiation Ionizing Drug Discovery medicine Humans Sensitization Micelles Chemotherapy Chemistry Chemoradiotherapy HCT116 Cells 3. Good health Phosphotransferases (Alcohol Group Acceptor) 030104 developmental biology medicine.anatomical_structure DNA Repair Enzymes Drug Resistance Neoplasm Cancer research Molecular Medicine Colorectal Neoplasms Synthetic Lethal Mutations DNA medicine.drug |
| Zdroj: | Molecular pharmaceutics. 15(6) |
| ISSN: | 1543-8392 |
| Popis: | There is increasing interest in developing and applying DNA repair inhibitors in cancer treatment to augment the efficacy of radiation and conventional genotoxic chemotherapy. However, targeting the inhibitor is required to avoid reducing the repair capacity of normal tissue. The aim of this study was to develop nanodelivery systems for the encapsulation of novel imidopiperidine-based inhibitors of the DNA 3'-phosphatase activity of polynucleotide kinase/phosphatase (PNKP), a DNA repair enzyme that plays a critical role in rejoining DNA single- and double-strand breaks. For this purpose, newly identified hit compounds with potent PNKP inhibitory activity, imidopiperidines A12B4C50 and A83B4C63 were encapsulated in polymeric micelles of different poly(ethylene oxide)- b-poly(ε-caprolactone) (PEO- b-PCL)-based structures. Our results showed efficient loading of A12B4C50 and A83B4C63 in PEO- b-PCLs with pendent carboxyl and benzyl carboxylate groups, respectively, and relatively slow release over 24 h. Both free and encapsulated inhibitors were able to sensitize HCT116 cells to radiation and the topoisomerase I poison, irinotecan. In addition, the encapsulated inhibitors were capable of inducing synthetic lethalilty in phosphatase and tensin homologue (PTEN)-deficient cells. We also established the validity of the peptide GE11 as a suitable ligand for active targeted delivery of nanoencapsulated drugs to colorectal cancer cells overexpressing epidermal growth factor receptor (EGFR). Our results show the potential of nanoencapsulated inhibitors of PNKP as either mono or combined therapeutic agents for colorectal cancer. |
| Databáze: | OpenAIRE |
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