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1.
Chemistry ; 28(4): e202200039, 2022 Jan 19.
Article in English | MEDLINE | ID: covidwho-1633218

ABSTRACT

Invited for the cover of this issue are Manfred Marschall, Svetlana B. Tsogoeva and co-workers at Friedrich-Alexander University of Erlangen-Nürnberg. The image depicts a new anti-SARS-CoV-2 compound in front of SARS-CoV-2 viruses. Read the full text of the article at 10.1002/chem.202103861.


Subject(s)
COVID-19 , Quinolines , Cell Culture Techniques , Humans , SARS-CoV-2
2.
Chemistry – A European Journal ; 28(4):e202200038, 2022.
Article in English | Wiley | ID: covidwho-1626181

ABSTRACT

A new anti-SARS-CoV-2 compound, developed in this joint study, is shown in front of SARS-CoV-2 viruses. The ongoing pandemic of human SARS-CoV-2 infections (COVID-19) creates a high demand for antiviral drug development. The shown quinoline?morpholine hybrid and other new quinoline-based compounds were synthesized and investigated for their in vitro activity against SARS-CoV-2. They exerted an anti-SARS-CoV-2 activity similar to or stronger than that of the reference drug. More information can be found in the Research Article by M. Marschall, S.?B. Tsogoeva et?al. (DOI: 10.1002/chem.202103861).

3.
Chemistry – A European Journal ; n/a(n/a):e202200038, 2022.
Article in English | Wiley | ID: covidwho-1615948

ABSTRACT

A new anti-SARS-CoV-2 compound, developed in this joint study, is shown in front of SARS-CoV-2 viruses. The ongoing pandemic of human SARS-CoV-2 infections (COVID-19) creates a high demand for antiviral drug development. The shown quinoline?morpholine hybrid and other new quinoline-based compounds were synthesized and investigated for their in vitro activity against SARS-CoV-2. They exerted an anti-SARS-CoV-2 activity similar to or stronger than that of the reference drug. More information can be found in the Research Article by M. Marschall, S.?B. Tsogoeva et?al. (DOI: 10.1002/chem.202103861).

4.
Chemistry ; 28(4): e202103861, 2022 Jan 19.
Article in English | MEDLINE | ID: covidwho-1549185

ABSTRACT

The presently ongoing pandemic of human SARS-CoV-2 infections (COVID-19) presents an enormous challenge in surveillance, vaccine and antiviral drug development. Here we report the synthesis of new bioactive quinoline-morpholine hybrid compounds and their virological evaluation, which proves pronounced cell culture-based inhibitory profile against SARS-CoV-2. Thus, selected quinoline compounds may suggest specific hit-to-lead development.


Subject(s)
COVID-19 , Quinolines , Antiviral Agents/pharmacology , Cell Culture Techniques , Humans , Pandemics , Quinolines/pharmacology , SARS-CoV-2
5.
Int J Mol Sci ; 22(23)2021 Nov 27.
Article in English | MEDLINE | ID: covidwho-1542584

ABSTRACT

Human cytomegalovirus (HCMV) is a major pathogenic herpesvirus that is prevalent worldwide and it is associated with a variety of clinical symptoms. Current antiviral therapy options do not fully satisfy the medical needs; thus, improved drug classes and drug-targeting strategies are required. In particular, host-directed antivirals, including pharmaceutical kinase inhibitors, might help improve the drug qualities. Here, we focused on utilizing PROteolysis TArgeting Chimeras (PROTACs), i.e., hetero-bifunctional molecules containing two elements, namely a target-binding molecule and a proteolysis-inducing element. Specifically, a PROTAC that was based on a cyclin-dependent kinase (CDK) inhibitor, i.e., CDK9-directed PROTAC THAL-SNS032, was analyzed and proved to possess strong anti-HCMV AD169-GFP activity, with values of EC50 of 0.030 µM and CC50 of 0.175 µM (SI of 5.8). Comparing the effect of THAL-SNS032 with its non-PROTAC counterpart SNS032, data indicated a 3.7-fold stronger anti-HCMV efficacy. This antiviral activity, as illustrated for further clinically relevant strains of human and murine CMVs, coincided with the mid-nanomolar concentration range necessary for a drug-induced degradation of the primary (CDK9) and secondary targets (CDK1, CDK2, CDK7). In addition, further antiviral activities were demonstrated, such as the inhibition of SARS-CoV-2 replication, whereas other investigated human viruses (i.e., varicella zoster virus, adenovirus type 2, and Zika virus) were found insensitive. Combined, the antiviral quality of this approach is seen in its (i) mechanistic uniqueness; (ii) future options of combinatorial drug treatment; (iii) potential broad-spectrum activity; and (iv) applicability in clinically relevant antiviral models. These novel data are discussed in light of the current achievements of anti-HCMV drug development.


Subject(s)
Antiviral Agents/pharmacology , Cytomegalovirus/drug effects , Intercellular Signaling Peptides and Proteins/pharmacology , Adenoviridae/drug effects , Animals , COVID-19/drug therapy , Cell Line , Cyclin-Dependent Kinase 9 , Drug Delivery Systems , Herpesvirus 3, Human/drug effects , Humans , Intercellular Signaling Peptides and Proteins/chemistry , Mice , Protein Kinase Inhibitors/pharmacology , SARS-CoV-2/drug effects , Virus Replication/drug effects , Zika Virus/drug effects
6.
Pathogens ; 10(9)2021 Aug 25.
Article in English | MEDLINE | ID: covidwho-1374480

ABSTRACT

Currently, human infections with the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) are accelerating the ongoing spread of the pandemic. Several innovative types of vaccines have already been developed, whereas effective options of antiviral treatments still await a scientific implementation. The development of novel anti-SARS-CoV-2 drug candidates demands skillful strategies and analysis systems. Promising results have been achieved with first generation direct-acting antivirals targeting the viral polymerase RdRp or the protease 3CLpro. Such recently approved or investigational drugs like remdesivir and GC376 represent a basis for further development and optimization. Here, we establish a multi-readout assay (MRA) system that enables the antiviral assessment and mechanistic characterization of novel test compounds, drug repurposing and combination treatments. Our SARS-CoV-2-specific MRA combines the quantitative measurement of several parameters of virus infection, such as the intracellular production of proteins and genomes, enzymatic activities and virion release, as well as the use of reporter systems. In this regard, the antiviral efficacy of remdesivir and GC376 has been investigated in human Caco-2 cells. The readouts included the use of spike- and double-strand RNA-specific monoclonal antibodies for in-cell fluorescence imaging, a newly generated recombinant SARS-CoV-2 reporter virus d6YFP, the novel 3CLpro-based FRET CFP::YFP and the previously reported FlipGFP reporter assays, as well as viral genome-specific RT-qPCR. The data produced by our MRA confirm the high antiviral potency of these two drugs in vitro. Combined, this MRA approach may be applied for broader analyses of SARS-CoV-2-specific antivirals, including compound screenings and the characterization of selected drug candidates.

7.
Viruses ; 12(12)2020 12 05.
Article in English | MEDLINE | ID: covidwho-966929

ABSTRACT

The ongoing pandemic spread of the severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) demands skillful strategies for novel drug development, drug repurposing and cotreatments, in particular focusing on existing candidates of host-directed antivirals (HDAs). The developmental drug IMU-838, currently being investigated in a phase 2b trial in patients suffering from autoimmune diseases, represents an inhibitor of human dihydroorotate dehydrogenase (DHODH) with a recently proven antiviral activity in vitro and in vivo. Here, we established an analysis system for assessing the antiviral potency of IMU-838 and DHODH-directed back-up drugs in cultured cell-based infection models. By the use of SARS-CoV-2-specific immunofluorescence, Western blot, in-cell ELISA, viral yield reduction and RT-qPCR methods, we demonstrated the following: (i) IMU-838 and back-ups show anti-SARS-CoV-2 activity at several levels of viral replication, i.e., protein production, double-strand RNA synthesis, and release of infectious virus; (ii) antiviral efficacy in Vero cells was demonstrated in a micromolar range (IMU-838 half-maximal effective concentration, EC50, of 7.6 ± 5.8 µM); (iii) anti-SARS-CoV-2 activity was distinct from cytotoxic effects (half-cytotoxic concentration, CC50, >100 µM); (iv) the drug in vitro potency was confirmed using several Vero lineages and human cells; (v) combination with remdesivir showed enhanced anti-SARS-CoV-2 activity; (vi) vidofludimus, the active determinant of IMU-838, exerted a broad-spectrum activity against a selection of major human pathogenic viruses. These findings strongly suggest that developmental DHODH inhibitors represent promising candidates for use as anti-SARS-CoV-2 therapeutics.


Subject(s)
Antiviral Agents/pharmacology , Drug Repositioning , Oxidoreductases Acting on CH-CH Group Donors/antagonists & inhibitors , SARS-CoV-2/drug effects , Adenosine Monophosphate/analogs & derivatives , Adenosine Monophosphate/pharmacology , Alanine/analogs & derivatives , Alanine/pharmacology , Animals , Antiviral Agents/chemistry , COVID-19/drug therapy , Chlorocebus aethiops , Clinical Trials, Phase II as Topic , Drug Discovery , Drug Synergism , Humans , Vero Cells , Virus Replication/drug effects
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