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2.
Nat Commun ; 13(1): 719, 2022 02 15.
Article in English | MEDLINE | ID: covidwho-1692616

ABSTRACT

There is an urgent need for potent and selective antivirals against SARS-CoV-2. Pfizer developed PF-07321332 (PF-332), a potent inhibitor of the viral main protease (Mpro, 3CLpro) that can be dosed orally and that is in clinical development. We here report that PF-332 exerts equipotent in vitro activity against the four SARS-CoV-2 variants of concerns (VoC) and that it can completely arrest replication of the alpha variant in primary human airway epithelial cells grown at the air-liquid interface. Treatment of Syrian Golden hamsters with PF-332 (250 mg/kg, twice daily) completely protected the animals against intranasal infection with the beta (B.1.351) and delta (B.1.617.2) SARS-CoV-2 variants. Moreover, treatment of SARS-CoV-2 (B.1.617.2) infected animals with PF-332 completely prevented transmission to untreated co-housed sentinels.


Subject(s)
COVID-19/drug therapy , Disease Models, Animal , Lactams/administration & dosage , Leucine/administration & dosage , Nitriles/administration & dosage , Proline/administration & dosage , SARS-CoV-2/drug effects , Viral Protease Inhibitors/administration & dosage , A549 Cells , Administration, Oral , Animals , COVID-19/prevention & control , COVID-19/transmission , COVID-19/virology , Chlorocebus aethiops , Coronavirus 3C Proteases/antagonists & inhibitors , Cricetinae , Humans , Lactams/pharmacokinetics , Leucine/pharmacokinetics , Mesocricetus , Nitriles/pharmacokinetics , Proline/pharmacokinetics , Respiratory Mucosa/drug effects , Respiratory Mucosa/virology , SARS-CoV-2/enzymology , SARS-CoV-2/physiology , Vero Cells , Viral Protease Inhibitors/pharmacokinetics , Virus Replication/drug effects
3.
Science ; 374(6575): 1586-1593, 2021 Dec 24.
Article in English | MEDLINE | ID: covidwho-1666355

ABSTRACT

The worldwide outbreak of COVID-19 caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has become a global pandemic. Alongside vaccines, antiviral therapeutics are an important part of the healthcare response to countering the ongoing threat presented by COVID-19. Here, we report the discovery and characterization of PF-07321332, an orally bioavailable SARS-CoV-2 main protease inhibitor with in vitro pan-human coronavirus antiviral activity and excellent off-target selectivity and in vivo safety profiles. PF-07321332 has demonstrated oral activity in a mouse-adapted SARS-CoV-2 model and has achieved oral plasma concentrations exceeding the in vitro antiviral cell potency in a phase 1 clinical trial in healthy human participants.


Subject(s)
COVID-19/drug therapy , Lactams/pharmacology , Lactams/therapeutic use , Leucine/pharmacology , Leucine/therapeutic use , Nitriles/pharmacology , Nitriles/therapeutic use , Proline/pharmacology , Proline/therapeutic use , SARS-CoV-2/drug effects , Viral Protease Inhibitors/pharmacology , Viral Protease Inhibitors/therapeutic use , Administration, Oral , Animals , COVID-19/virology , Clinical Trials, Phase I as Topic , Coronavirus/drug effects , Disease Models, Animal , Drug Therapy, Combination , Humans , Lactams/administration & dosage , Lactams/pharmacokinetics , Leucine/administration & dosage , Leucine/pharmacokinetics , Mice , Mice, Inbred BALB C , Microbial Sensitivity Tests , Nitriles/administration & dosage , Nitriles/pharmacokinetics , Proline/administration & dosage , Proline/pharmacokinetics , Randomized Controlled Trials as Topic , Ritonavir/administration & dosage , Ritonavir/therapeutic use , SARS-CoV-2/physiology , Viral Protease Inhibitors/administration & dosage , Viral Protease Inhibitors/pharmacokinetics , Virus Replication/drug effects
4.
Nature ; 601(7894): 496, 2022 01.
Article in English | MEDLINE | ID: covidwho-1641925

Subject(s)
Antiviral Agents/therapeutic use , COVID-19/drug therapy , COVID-19/virology , Drug Development/trends , Drug Resistance, Viral , Research Personnel , SARS-CoV-2/drug effects , Adenosine Monophosphate/administration & dosage , Adenosine Monophosphate/analogs & derivatives , Adenosine Monophosphate/pharmacology , Adenosine Monophosphate/therapeutic use , Administration, Oral , Alanine/administration & dosage , Alanine/analogs & derivatives , Alanine/pharmacology , Alanine/therapeutic use , Antiviral Agents/administration & dosage , Antiviral Agents/pharmacology , Antiviral Agents/supply & distribution , COVID-19/mortality , COVID-19/prevention & control , COVID-19 Vaccines/supply & distribution , Cytidine/administration & dosage , Cytidine/analogs & derivatives , Cytidine/pharmacology , Cytidine/therapeutic use , Drug Approval , Drug Combinations , Drug Resistance, Viral/drug effects , Drug Resistance, Viral/genetics , Drug Therapy, Combination , Hospitalization/statistics & numerical data , Humans , Hydroxylamines/administration & dosage , Hydroxylamines/pharmacology , Hydroxylamines/therapeutic use , Lactams/administration & dosage , Lactams/pharmacology , Lactams/therapeutic use , Leucine/administration & dosage , Leucine/pharmacology , Leucine/therapeutic use , Medication Adherence , Molecular Targeted Therapy , Mutagenesis , Nitriles/administration & dosage , Nitriles/pharmacology , Nitriles/therapeutic use , Proline/administration & dosage , Proline/pharmacology , Proline/therapeutic use , Public-Private Sector Partnerships/economics , Ritonavir/administration & dosage , Ritonavir/pharmacology , Ritonavir/therapeutic use , SARS-CoV-2/enzymology , SARS-CoV-2/genetics
6.
Nat Commun ; 12(1): 6055, 2021 10 18.
Article in English | MEDLINE | ID: covidwho-1475294

ABSTRACT

COVID-19 caused by the SARS-CoV-2 virus has become a global pandemic. 3CL protease is a virally encoded protein that is essential across a broad spectrum of coronaviruses with no close human analogs. PF-00835231, a 3CL protease inhibitor, has exhibited potent in vitro antiviral activity against SARS-CoV-2 as a single agent. Here we report, the design and characterization of a phosphate prodrug PF-07304814 to enable the delivery and projected sustained systemic exposure in human of PF-00835231 to inhibit coronavirus family 3CL protease activity with selectivity over human host protease targets. Furthermore, we show that PF-00835231 has additive/synergistic activity in combination with remdesivir. We present the ADME, safety, in vitro, and in vivo antiviral activity data that supports the clinical evaluation of PF-07304814 as a potential COVID-19 treatment.


Subject(s)
COVID-19/drug therapy , Coronavirus 3C Proteases/antagonists & inhibitors , Coronavirus Protease Inhibitors/administration & dosage , Indoles/administration & dosage , Leucine/administration & dosage , Pyrrolidinones/administration & dosage , Adenosine Monophosphate/administration & dosage , Adenosine Monophosphate/adverse effects , Adenosine Monophosphate/analogs & derivatives , Adenosine Monophosphate/pharmacokinetics , Alanine/administration & dosage , Alanine/adverse effects , Alanine/analogs & derivatives , Alanine/pharmacokinetics , Animals , COVID-19/virology , Chlorocebus aethiops , Coronavirus 229E, Human/drug effects , Coronavirus 229E, Human/enzymology , Coronavirus Protease Inhibitors/adverse effects , Coronavirus Protease Inhibitors/pharmacokinetics , Disease Models, Animal , Drug Design , Drug Synergism , Drug Therapy, Combination , HeLa Cells , Humans , Indoles/adverse effects , Indoles/pharmacokinetics , Infusions, Intravenous , Leucine/adverse effects , Leucine/pharmacokinetics , Mice , Pyrrolidinones/adverse effects , Pyrrolidinones/pharmacokinetics , SARS Virus/drug effects , SARS Virus/enzymology , SARS-CoV-2/drug effects , SARS-CoV-2/enzymology , Vero Cells
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