Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 24, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/ijms24043972
Keywords
SARS-CoV-2; protease inhibitors; cell line specificity pyridyl indole carboxylates; azapeptide nitriles; peptidomimetics
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Recently, we investigated novel pyridyl indole esters and peptidomimetics as potent inhibitors of SARS-CoV-2 main protease. We analyzed the impact of these compounds on viral replication and found that their effectiveness varied in different cell lines. In Huh-7 cells, the protease inhibitors suppressed viral replication by up to 5 orders of magnitude, while in Calu-3 cells, suppression by 2 orders of magnitude was achieved. Three pyridin-3-yl indole-carboxylates showed antiviral activity in all cell lines and also in human precision-cut lung slices.
Recently, we have described novel pyridyl indole esters and peptidomimetics as potent inhibitors of the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) main protease. Here, we analysed the impact of these compounds on viral replication. It has been shown that some antivirals against SARS-CoV-2 act in a cell line-specific way. Thus, the compounds were tested in Vero, Huh-7, and Calu-3 cells. We showed that the protease inhibitors at 30 mu M suppress viral replication by up to 5 orders of magnitude in Huh-7 cells, while in Calu-3 cells, suppression by 2 orders of magnitude was achieved. Three pyridin-3-yl indole-carboxylates inhibited viral replication in all cell lines, indicating that they might repress viral replication in human tissue as well. Thus, we investigated three compounds in human precision-cut lung slices and observed donor-dependent antiviral activity in this patient-near system. Our results provide evidence that even direct-acting antivirals may act in a cell line-specific manner.
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