Photodynamic therapy of pheophorbide a inhibits the proliferation of human breast tumour via both caspase-dependent and -independent apoptotic pathways in in vitro and in vivo models
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AbstractBreast cancer is conventionally treated by surgery and radiotherapy, with adjuvant chemotherapy and hormonotherapy as supplementary treatments. However, such treatments are associated with adverse side effects and drug resistance. In this study, Pheophorbide a (Pa), a photosensitizer isolated from Scutelleria barbata, was analysed for its antiproliferative effect on human breast tumour cells. The IC (inhibitory concentration)50 of the combined treatment of Pa and photodynamic therapy (Pa-PDT) on human breast tumour MCF-7 cells was 0.5?mu m. Mechanistic studies in MCF-7 cells demonstrated that Pa was localized in the mitochondria, and reactive oxygen species were found to be released after Pa-PDT. Apoptosis was the major mechanism responsible for the tumour cell death, and mitochondrial membrane depolarization and cytochrome c release highlighted the role of mitochondria in the apoptotic mechanism. Up-regulation of tumour suppressor protein p53, cleavage of caspase-9 and poly (ADP-ribose) polymerase suggested that the caspase-dependent pathway was induced, while the release of apoptosis-inducing factors demonstrated that the apoptosis was also mediated by the caspase-independent mechanism. In vivo study using the mouse xenograft model showed a significant inhibition of MCF-7 tumour growth by Pa-PDT. Together, the results of this study provide a basis for understanding and developing Pa-PDT as a cure for breast cancer
All Author(s) ListHoi S.W.-H., Wong H.M., Chan J.Y.-W., Yue G.G.L., Tse G.M.-K., Law B.K.-B., Fong W.P., Fung K.P.
Journal namePhytotherapy Research
Detailed descriptionTo ORKTS: DOI: 10.1002/ptr.3607
Year2012
Month5
Day1
Volume Number26
Issue Number5
PublisherJohn Wiley & Sons Inc.
Place of PublicationUnited States
Pages734 - 742
ISSN0951-418X
eISSN1099-1573
LanguagesEnglish-United Kingdom
Keywordsapoptosis, breast cancer, MCF-7, Pheophorbide a, photodynamic therapy

Last updated on 2020-25-11 at 03:21