ARTICLE

High titer oncolytic measles virus production process by integration of dielectric spectroscopy as online monitoring system

Tanja A. Grein

Tanja A. Grein

Institute of Bioprocess Engineering Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany

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Daniel Loewe

Daniel Loewe

Institute of Bioprocess Engineering Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany

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Hauke Dieken

Hauke Dieken

Institute of Bioprocess Engineering Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany

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Denise Salzig

Denise Salzig

Institute of Bioprocess Engineering Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany

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Tobias Weidner

Tobias Weidner

Institute of Bioprocess Engineering Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany

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Peter Czermak

Corresponding Author

Peter Czermak

Institute of Bioprocess Engineering Pharmaceutical Technology, University of Applied Sciences Mittelhessen, Giessen, Germany

Faculty of Biology and Chemistry, Justus Liebig University, Giessen, Germany

Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Project group Bioresources, Giessen, Germany

Correspondence

Peter Czermak, University of Applied Sciences Mittelhessen, Wiesenstrasse 14, 35390 Giessen, Germany.

Email: peter.czermak@lse.thm.de

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First published: 30 December 2017
Citations: 26

Abstract

Oncolytic viruses offer new hope to millions of patients with incurable cancer. One promising class of oncolytic viruses is Measles virus, but its broad administration to cancer patients is currently hampered by the inability to produce the large amounts of virus needed for treatment (1010–1012 virus particles per dose). Measles virus is unstable, leading to very low virus titers during production. The time of infection and time of harvest are therefore critical parameters in a Measles virus production process, and their optimization requires an accurate online monitoring system. We integrated a probe based on dielectric spectroscopy (DS) into a stirred tank reactor to characterize the Measles virus production process in adherent growing Vero cells. We found that DS could be used to monitor cell adhesion on the microcarrier and that the optimal virus harvest time correlated with the global maximum permittivity signal. In 16 independent bioreactor runs, the maximum Measles virus titer was achieved approximately 40 hr after the permittivity maximum. Compared to an uncontrolled Measles virus production process, the integration of DS increased the maximum virus concentration by more than three orders of magnitude. This was sufficient to achieve an active Measles virus concentration of > 1010 TCID50 ml−1.