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Open Access 01-12-2011 | Research article

The BH3 mimetic ABT-737 increases treatment efficiency of paclitaxel against hepatoblastoma

Authors: Justus Lieber, Carmen Eicher, Julia Wenz, Bettina Kirchner, Steven W Warmann, Jörg Fuchs, Sorin Armeanu-Ebinger

Published in: BMC Cancer | Issue 1/2011

Abstract

Background

The primary goal of current chemotherapy in hepatoblastoma (HB) is reduction of tumour volume and vitality to enable complete surgical resection and reduce risk of recurrence or metastatic disease. Drug resistance remains a major challenge for HB treatment. In some malignancies inhibition of anti-apoptotic pathways using small BH3 mimetic molecules like ABT-737 shows synergistic effects in combination with cystotoxic agents in vitro. Now we analysed toxicology and synergistic effects of this approach in HB cells and HB xenografts.

Methods

Viability was monitored in HB cells (HUH6 and HepT1) and fibroblasts treated with paclitaxel, ABT-737 and a combination of both in a MTT assay. HUH6 xenotransplants in NOD/LtSz-scid IL2Rγnull mice (NSG) were treated accordingly. Tumour volume and body weight were monitored. Xenografted tumours were analysed by histology and immunohistochemistry (Ki-67 and TUNEL assay).

Results

ABT-737 reduced viability in HUH6 and HepT1 cells cultures at concentrations above 1 μM and also enhanced the cytotoxic effect of paclitaxel when used in combination. Thereby paclitaxel could be reduced tenfold to achieve similar reduction of viability of tumour cells. In contrast no toxicity in fibroblasts was observed at the same regiments. Subcutaneous HB (HUH6) treated with paclitaxel (12 mg/kg body weight, n = 7) led to delayed tumour growth in the beginning of the experiment. However, tumour volume was similar to controls (n = 5) at day 25. Combination treatment with paclitaxel and ABT-737 (100 mg/kg, n = 8) revealed significantly 10 fold lower relative tumour volumes compared to control and paclitaxel groups. Paclitaxel dependent toxicity was observed in this mice strain.

Conclusions

Our results demonstrate enhancement of chemotherapy by using modulators of apoptosis. Further analyses should include improved pharmacological formulations of paclitaxel and BH3 mimetics in order to reduce toxicological effects. Sensitising HB to apoptosis may also render resistant HB susceptible to established chemotherapy regimens.

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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2407/11/362/prepub

Title: The BH3 mimetic ABT-737 increases treatment efficiency of paclitaxel against hepatoblastoma
Authors: Justus Lieber
Carmen Eicher
Julia Wenz
Bettina Kirchner
Steven W Warmann
Jörg Fuchs
Sorin Armeanu-Ebinger
Publication date: 01-12-2011
Publisher: BioMed Central
Published in: BMC Cancer / Issue 1/2011
Electronic ISSN: 1471-2407
DOI: https://doi.org/10.1186/1471-2407-11-362

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