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Abstract

The 2',5'- oligoadenylate synthetase (OAS) – ribonuclease L (RNAseL) - phosphodiesterase 12 (PDE12) pathway is an essential interferon-induced effector mechanism against RNA virus infection. Inhibition of PDE12 leads to selective amplification of RNAseL activity in infected cells. We aimed to investigate PDE12 as a potential pan-RNA virus antiviral drug target and develop PDE12 inhibitors that elicit antiviral activity against a range of viruses. A library of 18 000 small molecules was screened for PDE12 inhibitor activity using a fluorescent probe specific for PDE12. The lead compounds (CO-17 or CO-63) were tested in cell-based antiviral assays using encephalomyocarditis virus (EMCV), hepatitis C virus (HCV), dengue virus (DENV), West Nile virus (WNV) and severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), . Cross reactivity of PDE12 inhibitors with other PDEs and toxicity were measured. In EMCV assays, CO-17 potentiated the effect of IFNα by 3 log. The compounds were selective for PDE12 when tested against a panel of other PDEs and non-toxic at up to 42 mg kg in rats . Thus, we have identified PDE12 inhibitors (CO-17 and CO-63), and established the principle that inhibitors of PDE12 have antiviral properties. Early studies suggest these PDE12 inhibitors are well tolerated at the therapeutic range, and reduce viral load in studies of DENV, HCV, WNV and SARS-CoV-2 in human cells and WNV in a mouse model.

Funding
This study was supported by the:
  • European Commission (Award 282378)
    • Principle Award Recipient: ThomasHowardScreatonGavinThurszMarkMatthewsIan
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. The Microbiology Society waived the open access fees for this article.
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/content/journal/jgv/10.1099/jgv.0.001865
2023-07-11
2024-05-23
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