Cell death induced by MPPa-PDT in prostate carcinoma in vitro and in vivo

Yuanyuan Tian, Wingnang Leung*, Kevin K M YUE, Nai Ki MAK

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

31 Citations (Scopus)


Lack of effective photosensitizers has become a major limit for extensive application of photodynamic therapy. In this study, the photocytotoxicity and mode of death induced by a newly developed photosensitizer MPPa, a derivative of chlorophyll a, were investigated in PC-3M cell line, a highly metastatic variant of poorly differentiated androgen-independent proctanec adenocarcinoma PC-3. MTT reduction assay was used to measure cytotoxicity in both PC-3M and HUVEC, after which a flow cytometer was used to measure apoptotic rate and cell cycle, and then Caspase-3, -8, -9 were investigated. Finally, an animal model was set up to embody the curative effect and for histopathological examinations. The photocytotoxicity of MPPa showed both light- and drug-dose dependent characteristics and no significant dark cytotoxicity was observed in PC-3M cells. In HUVEC, MPPa exhibited an obviously low cytotoxicity. By other in vitro studies, we found MPPa-PDT induced apoptotic mainly via the mitochondrial/Caspase-9/Caspase-3 pathway and could restrain the cell cycle progression from the more sensitive G0/G1-phases. In vivo, the tumour growth was significantly inhibited after PDT, and many apoptotic cells could be seen by histopathological examinations. These results indicate the death way of cells induced by MPPa is mainly via mild apoptotic and the cure effect is obvious, suggesting that MPPa is a potential photosensitizer of photodynamic therapy for prostate cancer.

Original languageEnglish
Pages (from-to)413-420
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number2
Publication statusPublished - 22 Sept 2006

Scopus Subject Areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

User-Defined Keywords

  • Cell death
  • Photodynamic therapy
  • Prostate carcinoma


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