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Proceedings Paper

Effect of verteporfin-PDT on epithelial growth factor receptor (EGFR) signaling pathway in cholangiocarcinoma cell lines
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Paper Abstract

EGFR, a member of the ERBB family, plays a pivotal role in carcinogenesis. EGFR overexpression is implicated in DNA repair and synergistic interactions between EGFR-targeting drugs and conventional chemo/radiotherapy have been reported in preclinical studies for different cancers but not cholangiocarcinoma (CCA). To date there are no in vitro data available on the cellular response and effect of either photodynamic therapy (PDT) or EGFR-targeting drugs on CCA. Therefore, we aimed to study the: (i) response to Verteporfin PDT and to EGFR-targeting drugs, as single agents; (ii) effect of PDT on ERBBs expression, phosporylation status and activation of its signaling pathways; (iii) response to combination of PDT and EGFR-targeting agents. We showed that two cholangiocarcinoma cell lines (HuCCT1 and TFK1 cells, intra- and extrahepatic, respectively) differentially respond to verteporfin-PDT treatment and are resistant to EGFR-targeting agents. A constitutive activation of EGFR in both cell lines was also observed, which could partly account for the observed resistance to EGFR-targeting drugs. In addition, verteporfin-PDT induced further phosphorylation of both EGFR and other Receptor Tyrosine Kinases. Mitochondria-independent apoptosis was induced by PDT in both CCA cell lines; in particular, PDT modulated the expression of members of the Inhibitor of Apoptosis (IAP) family of proteins. Interestingly, there was a PDT-induced EGFR nuclear translocation in both cell lines; co-treatment with either an EGFR-inhibitor (Cetuximab) or a nuclear import blocking agent (Wheat Germ Agglutinin) had an additive effect on PDT cell killing, thus implying a role of EGFR in repairing the potential PDT-induced DNA damage.

Paper Details

Date Published: 13 July 2009
PDF: 6 pages
Proc. SPIE 7380, Photodynamic Therapy: Back to the Future, 73806P (13 July 2009); doi: 10.1117/12.828272
Show Author Affiliations
Fausto Andreola, Univ. College London (United Kingdom)
Virginie Cerec, Univ. College London (United Kingdom)
Stephen P. Pereira, Univ. College London (United Kingdom)


Published in SPIE Proceedings Vol. 7380:
Photodynamic Therapy: Back to the Future
David H. Kessel, Editor(s)

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