Title: Enhanced efficacy of combined 213Bi-DTPA-F3 and paclitaxel therapy of peritoneal carcinomatosis is mediated by enhanced induction of apoptosis and G2/M phase arrest
Authors: VALLON M.SEIDL C.BLECHERT B.LI ZhouleiGILBERTZ K.-P.BAUMGART AnjaAICHLER MFEUCHTINGER AGAERTNER F. C.BRUCHERTSEIFER FrankMORGENSTERN AlfredWALCH Axel K.SENEKOWITSCH-SCHMIDTKE R.ESSLER M.
Citation: EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING vol. 39 p. 1886 - 1897
Publisher: SPRINGER
Publication Year: 2012
JRC N°: JRC76583
ISSN: 1619-7070
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC76583
DOI: 10.1007/s00259-012-2203-z
Type: Articles in Journals
Abstract: Targeted therapy with α-particle emitting radionuclidesis a promising new option in cancer therapy. Stable conjugates of the vascular tumour-homing peptide F3 with the α-emitter 213Bi specifically target tumour cells. The aim of our study was to determine efficacy of combined 213Bidiethylenetriaminepentaacetic acid (DTPA)-F3 and paclitaxel treatment compared to treatment with either 213Bi-DTPAF3 or paclitaxel both in vitro and in vivo. Methods Cytotoxicity of treatment with 213Bi-DTPA-F3 and paclitaxel, alone or in combination, was assayed towards OVCAR-3 cells using the alamarBlue assay, the clonogenic assay and flow cytometric analyses of the mode of cell death and cell cycle arrest. Therapeutic efficacy of the different treatment options was assayed after repeated treatment of mice bearing intraperitoneal OVCAR-3 xenograft tumours. Therapy monitoring was performed by bioluminescence imaging and histopathologic analysis. Treatment of OVCAR-3 cells in vitro with combined 213Bi-DTPA-F3 and paclitaxel resulted in enhanced cytotoxicity, induction of apoptosis and G2/M phase arrest compared to treatment with either 213Bi-DTPA-F3 or paclitaxel. Accordingly, i.p. xenograft OVCAR-3 tumours showed the best response following repeated (six times) combined therapy with 213Bi-DTPA-F3 (1.85 MBq) and paclitaxel (120 μg) as demonstrated by bioluminescence imaging and histopathologic investigation of tumour spread on the mesentery of the small and large intestine. Moreover, mean survival of xenograft mice that received combined therapy with 213Bi-DTPA-F3 and paclitaxel was significantly superior to mice treated with either 213Bi-DTPA-F3 or paclitaxel alone. Combined treatment with 213Bi-DTPA-F3 and paclitaxel significantly increased mean survival of mice with peritoneal carcinomatosis of ovarian origin, thus favouring future therapeutic application.
JRC Institute:Institute for Transuranium Elements

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