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Published on: August 9, 2013
Spent Medium Inhibits rVSV Infection
Rebecca Habisch1, Johannes Georg Wieland1, Sophia Kessler1
1Boehringer Ingelheim, Viral Therapeutics Center, Untere Wiesen 22, D-88416 Ochsenhausen, Germany.
Viruses
|May 27, 2026
Summary
Spent medium from high-density HEK293 cultures inhibits recombinant vesicular stomatitis virus (rVSV) infection. This inhibition, caused by an unknown factor <3 kDa, slows virus replication and impacts manufacturing yields.
Area of Science:
- Biotechnology
- Virology
- Cell Culture Technology
Background:
- Cell density effect limits virus manufacturing productivity.
- Spent medium's role in early infection is unclear.
Purpose of the Study:
- Investigate spent medium's impact on recombinant vesicular stomatitis virus (rVSV) infection.
- Identify factors in spent medium inhibiting viral replication.
Main Methods:
- Infection of HEK293 cells with rVSV in conditioned vs. fresh medium.
- Analysis of replication kinetics and yield.
- Filtration and size-based retention experiments to characterize inhibitors.
Main Results:
- High-density HEK293 spent medium significantly inhibits rVSV infection, even at low cell densities.
- Inhibition strength correlates with donor culture density and conditioning time.
- The inhibitory effect is medium-dependent and reversible.
- An unidentified inhibitor <3 kDa is suggested, excluding pH, nutrients, lactate, ammonium, debris, and EVs.
Conclusions:
- Spent medium from high-density cultures contains an inhibitor that suppresses rVSV infection and slows replication.
- This finding has implications for optimizing virus manufacturing processes and yields.
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