Enhanced efficacy of bleomycin in bladder cancer cells by photochemical internalization
2014 (English)In: BioMed Research International, ISSN 2314-6133, Vol. 14Article in journal (Refereed) Published
Bleomycin is a cytotoxic chemotherapeutic agent widely used in cancer treatment. However, its efficacy in different cancers is low, possibly due to limited cellular internalization. In this study, a novel approach known as photochemical internalization (PCI) was explored to enhance bleomycin delivery in bladder cancer cells (human T24 and rat AY-27), as bladder cancer is a potential indication for use of PCI with bleomycin. The PCI technique was mediated by the amphiphilic photosensitizer disulfonated tetraphenyl chlorin (TPCS2a) and blue light (435 nm). Two additional strategies were explored to further enhance the cytotoxicity of bleomycin; a novel peptide drug ATX-101 which is known to impair DNA damage responses, and the protease inhibitor E-64 which may reduce bleomycin degradation by inhibition of bleomycin hydrolase. Our results demonstrate that the PCI technique enhances the bleomycin effect under appropriate conditions, and importantly we show that PCI-bleomycin treatment leads to increased levels of DNA damage supporting that the observed effect is due to increased bleomycin uptake. Impairing the DNA damage responses by ATX-101 further enhances the efficacy of the PCI-bleomycin treatment, while inhibiting the bleomycin hydrolase does not.
Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2014. Vol. 14
IdentifiersURN: urn:nbn:no:ntnu:diva-25150DOI: 10.1155/2014/921296OAI: oai:DiVA.org:ntnu-25150DiVA: diva2:733105
Copyright © 2014 Yan Baglo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.2014-07-082014-07-082014-07-08Bibliographically approved