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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

  • Mario Vallon
  • Christof SeidlEmail author
  • Birgit Blechert
  • Zhoulei Li
  • Klaus-Peter Gilbertz
  • Anja Baumgart
  • Michaela Aichler
  • Annette Feuchtinger
  • Florian C. Gaertner
  • Frank Bruchertseifer
  • Alfred Morgenstern
  • Axel K. Walch
  • Reingard Senekowitsch-Schmidtke
  • Markus Essler
Original Article

Abstract

Purpose

Targeted therapy with α-particle emitting radionuclides is 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 213Bi-diethylenetriaminepentaacetic acid (DTPA)-F3 and paclitaxel treatment compared to treatment with either 213Bi-DTPA-F3 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.

Results

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.

Conclusion

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.

Keywords

Targeted radionuclide therapy Tumour-homing peptide F3 Peritoneal carcinomatosis α-Emitter 213Bi Anticancer drug paclitaxel 

Notes

Acknowledgments

This work was supported by the Deutsche Forschungsgemeinschaft (SFB 824).

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Mario Vallon
    • 1
  • Christof Seidl
    • 1
    Email author
  • Birgit Blechert
    • 1
  • Zhoulei Li
    • 1
  • Klaus-Peter Gilbertz
    • 2
  • Anja Baumgart
    • 3
  • Michaela Aichler
    • 4
  • Annette Feuchtinger
    • 4
  • Florian C. Gaertner
    • 1
  • Frank Bruchertseifer
    • 5
  • Alfred Morgenstern
    • 5
  • Axel K. Walch
    • 4
  • Reingard Senekowitsch-Schmidtke
    • 1
  • Markus Essler
    • 1
  1. 1.Department of Nuclear MedicineTechnische Universität MünchenMunichGermany
  2. 2.Institute of RadiobiologyGerman Armed ForcesMunichGermany
  3. 3.III. Medical DepartmentTechnische Universität MünchenMunichGermany
  4. 4.Institute of PathologyHelmholtz Zentrum MünchenNeuherbergGermany
  5. 5.European Commission, Joint Research CentreInstitute for Transuranium ElementsKarlsruheGermany

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