Abstract:
:Riboflavin (Rf) is a vitamin and endogenous photosensitizer capable to generate reactive oxygen species (ROS) under UV-blue irradiation and kill cancer cells, which are characterized by the enhanced uptake of Rf. We confirmed its phototoxicity on human breast adenocarcinoma cells SK-BR-3 preincubated with 30-μM Rf and irradiated with ultraviolet light, and proved that such Rf concentrations (60 μM) are attainable in vivo in tumour site by systemic intravascular injection. In order to extend the Rf photosensitization depth in cancer tissue to 6 mm in depth, we purpose-designed core/shell upconversion nanoparticles (UCNPs, NaYF4:Yb3+:Tm3+/NaYF4) capable to convert 2% of the deeply-penetrating excitation at 975 nm to ultraviolet-blue power. This power was expended to photosensitise Rf and kill SK-BR-3 cells preincubated with UCNPs and Rf, where the UCNP-Rf energy transfer was photon-mediated with ~14% Förster process contribution. SK-BR-3 xenograft regression in mice was observed for 50 days, following the Rf-UCNPs peritumoural injection and near-infrared light photodynamic treatment of the lesions.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Khaydukov EV,Mironova KE,Semchishen VA,Generalova AN,Nechaev AV,Khochenkov DA,Stepanova EV,Lebedev OI,Zvyagin AV,Deyev SM,Panchenko VYdoi
10.1038/srep35103subject
Has Abstractpub_date
2016-10-12 00:00:00pages
35103issn
2045-2322pii
srep35103journal_volume
6pub_type
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