Skip to main content

Omeprazole Increases the Efficacy of Acyclovir Against Herpes Simplex Virus Type 1 and 2

Michaelis, Martin, Kleinschmidt, Malte C., Bojkova, Denisa, Rabenau, Holger F., Wass, Mark N., Cinatl Jr., Jindrich (2019) Omeprazole Increases the Efficacy of Acyclovir Against Herpes Simplex Virus Type 1 and 2. Frontiers in Microbiology, 10 . Article Number 2790. ISSN 1664-302X. (doi:10.3389/fmicb.2019.02790) (KAR id:79500)

PDF Publisher pdf
Language: English

Download (904kB) Preview
[thumbnail of fmicb-10-02790.pdf]
This file may not be suitable for users of assistive technology.
Request an accessible format
Official URL


Omeprazole was shown to improve the anti-cancer effects of the nucleoside analogue 5-fluorouracil. Here, we combined omeprazole with the antiviral nucleoside analogues ribavirin and acyclovir. Omeprazole did not affect the antiviral effects of ribavirin in non-toxic concentrations up to 80 μg/mL but increased the acyclovir-mediated effects on herpes simplex virus 1 and 2 (HSV-1 and -2) replication in a dose-dependent manner. Omeprazole alone reduced HSV-1 and -2 titers [but not HSV-induced formation of cytopathogenic effects (CPE)] at concentrations ≥40 μg/mL. However, it exerted substantially stronger effects on acyclovir activity and also increased acyclovir activity at lower concentrations that did not directly interfere with HSV replication. Omeprazole 80 μg/mL caused a 10.8-fold (Vero cells) and 47.7-fold (HaCaT cells) decrease of the acyclovir concentrations that reduced HSV-1-induced CPE formation by 50% (IC50). In HSV-2-infected cells, omeprazole 80 μg/mL reduced the acyclovir IC50 by 7.3- (Vero cells) and 12.9-fold (HaCaT cells). In HaCaT cells, omeprazole 80 μg/mL reduced the HSV-1 titer in the presence of acyclovir 1 μg/mL by 1.6 × 105-fold and the HSV-2 titer in the presence of acyclovir 2 μg/mL by 9.2 × 103-fold. The proton pump inhibitors pantoprazole, rabeprazole, lansoprazole, and dexlansoprazole increased the antiviral effects of acyclovir in a similar fashion as omeprazole, indicating this to be a drug class effect. In conclusion, proton pump inhibitors increase the anti-HSV activity of acyclovir and are candidates for antiviral therapies in combination with acyclovir, in particular for topical preparations for the treatment of immunocompromised individuals who are more likely to suffer from severe complications.

Item Type: Article
DOI/Identification number: 10.3389/fmicb.2019.02790
Uncontrolled keywords: HSV, HSV-1, HSV-2, antiviral therapy, antiviral drugs, ribavirin, proton pump inhibitors
Subjects: R Medicine > RM Therapeutics. Pharmacology
Divisions: Divisions > Division of Natural Sciences > School of Biosciences
Depositing User: Martin Michaelis
Date Deposited: 07 Jan 2020 10:08 UTC
Last Modified: 21 Oct 2020 10:36 UTC
Resource URI: (The current URI for this page, for reference purposes)
Michaelis, Martin:
Wass, Mark N.:
  • Depositors only (login required):


Downloads per month over past year