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Published in: Journal of Translational Medicine 1/2011

Open Access 01-12-2011 | Research

Bacterial glucuronidase as general marker for oncolytic virotherapy or other biological therapies

Authors: Michael Hess, Jochen Stritzker, Barbara Härtl, Julia B Sturm, Ivaylo Gentschev, Aladar A Szalay

Published in: Journal of Translational Medicine | Issue 1/2011

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Abstract

Background

Oncolytic viral tumor therapy is an emerging field in the fight against cancer with rising numbers of clinical trials and the first clinically approved product (Adenovirus for the treatment of Head and Neck Cancer in China) in this field. Yet, until recently no general (bio)marker or reporter gene was described that could be used to evaluate successful tumor colonization and/or transgene expression in other biological therapies.

Methods

Here, a bacterial glucuronidase (GusA) encoded by biological therapeutics (e.g. oncolytic viruses) was used as reporter system.

Results

Using fluorogenic probes that were specifically activated by glucuronidase we could show 1) preferential activation in tumors, 2) renal excretion of the activated fluorescent compounds and 3) reproducible detection of GusA in the serum of oncolytic vaccinia virus treated, tumor bearing mice in several tumor models. Time course studies revealed that reliable differentiation between tumor bearing and healthy mice can be done as early as 9 days post injection of the virus. Regarding the sensitivity of the newly developed assay system, we could show that a single infected tumor cell could be reliably detected in this assay.

Conclusion

GusA therefore has the potential to be used as a general marker in the preclinical and clinical evaluation of (novel) biological therapies as well as being useful for the detection of rare cells such as circulating tumor cells.
Appendix
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Metadata
Title
Bacterial glucuronidase as general marker for oncolytic virotherapy or other biological therapies
Authors
Michael Hess
Jochen Stritzker
Barbara Härtl
Julia B Sturm
Ivaylo Gentschev
Aladar A Szalay
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2011
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/1479-5876-9-172

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