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Firestein R , Marcinkiewicz C , Nie L , Chua HK , Velazquez Quesada I , Torelli M , Sternberg M , Gligorijevic B , Shenderova O , Schirhagl R , Feuerstein GZ
Pharmacodynamic Studies of Fluorescent Diamond Carriers of Doxorubicin in Liver Cancer Cells and Colorectal Cancer Organoids
Nanotechnol Sci Appl. 2021 ;14 :139-159
PMID: 34522092    PMCID: PMC8434926    URL: https://www.ncbi.nlm.nih.gov/pubmed/34522092
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BACKGROUND: We recently reported on preferential deposition of bare fluorescent diamond particles FDP-NV-700/800nm (FDP-NV) in the liver following intravenous administration to rats. The pharmacokinetics of FDP-NV in that species indicated short residency in the circulation by rapid clearance by the liver. Retention of FDP-NV in the liver was not associated with any pathology. These observations suggested that cancer therapeutics, such as doxorubicin, linked to FDP-NV, could potentially serve for anti-cancer treatment while sparing toxicities of peripheral organs. PURPOSE: To generate proof-of-concept (POC) and detail mechanisms of action of doxorubicin-coated FDP-NV-700/800nm (FDP-DOX) as a prospective chemotherapeutic for metastatic liver cancer. METHODS: FDP-DOX was generated by adsorption chemistry. Experimental design included concentration and time-dependent efficacy studies as compared with naïve (baren) FDP-NV in in vitro liver cancer cells models. Uptake of FDP-NV and FDP-DOX by HepG-2, Hep-3B and hCRC organoids were demonstrated by flow-cytometry and fluorescent microscopy. FDP-DOX pharmacodynamic effects included metabolic as well as cell death biomarkers Annexin V, TUNEL and LDH leakage. DOX desorpted from FDP-DOX was assessed by confocal microscopy and chemical assay of cells fractions. RESULTS: FDP-DOX efficacy was dose- and time-dependent and manifested in both liver cancer cell lines and human CRC organoids. FDP-DOX was rapidly internalized into cancer cells/organoids leading to cancer growth inhibition and apoptosis. FDP-DOX disrupted cell membrane integrity as evident by LDH release and suppressing mitochondrial metabolic pathways (AlamarBlue assay). Access of free DOX to the nuclei was confirmed by direct UV-Visible fluorescent assay and confocal microscopy of DOX fluorescence. CONCLUSION: The rapid uptake and profound cancer inhibition observed using FDP-DOX in clinically relevant cancer models, highlight FDP-DOX promise for cancer chemotherapeutics. We also conclude that the in vitro data justify further investment in in vivo POC studies.
1177-8903 Firestein, Ron Marcinkiewicz, Cezary Nie, Linyan Chua, Hui Kheng Orcid: 0000-0002-6047-4027 Velazquez Quesada, Ines Torelli, Marco Sternberg, Mark Gligorijevic, Bojana Shenderova, Olga Schirhagl, Romana Feuerstein, Giora Z Journal Article Nanotechnol Sci Appl. 2021 Sep 7;14:139-159. doi: 10.2147/NSA.S321725. eCollection 2021.