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Corona Accelerated R&D in Europe

Periodic Reporting for period 2 - CARE (Corona Accelerated R&D in Europe)

Reporting period: 2021-04-01 to 2022-03-31

The Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) pandemic has emerged as the largest global health threat to humanity in this century. The wide spectrum of clinical symptoms, disease severity in high risk individuals, transmission efficiency and high mortality, raised an immediate urgency for vaccines and therapeutics. The need for the control of the pandemic is reinforced by the emergence of viral variants of concern.
CARE has developed an insight-driven research approach that simultaneously addresses the therapeutic needs of patients with COVID-19 now, while also considering the needs of future patients, by initiating research to discover and develop new treatments to protect against SARS-CoV-2, its variants of concern and other coronavirus threats.
In this context, the CARE consortium aims to foster synergies between research, industry and the clinic to accelerate the development of effective therapies and improve evidence-based patient management. We are one project with two areas of focus: rapid emergency response as well as on long-term preparedness for future outbreaks. Our goal is to apply these learnings to the current COVID-19 emergency response through drug repositioning, and current and/or future coronavirus outbreaks by broad-spectrum small-molecule drug discovery and/or virus-neutralizing antibody discovery. To achieve this, a collection of repurposed drugs, focused libraries and small molecule libraries will be screened against SARS-CoV-2, other emerging SARS-CoV-2 variants of concern and related coronavirus genera in phenotypic or target-based assays. A focused medicinal chemistry campaign will identify small-molecule hits. In parallel, virus-neutralizing monoclonal antibodies will be generated and further characterized. Lead candidates will be evaluated in preclinical studies and advanced into Phase 1 and Phase 2 clinical trials in humans. Finally, immune markers will be identified contributing to the host immune responses to SARS-CoV-2 infections, and the correlation with clinical and virological outcomes will be determined.
The immediate efforts of the CARE consortium were focused on identifying existing drugs or molecules in advanced clinical development to provide fast therapeutic options to patients suffering from COVID-19 (drug repositioning). Multiple drugs were identified, which were also identified by others. Some other drugs proved to be active in cell culture as well, however, none was found suitable for clinical deployment.
In parallel, large screening campaigns in novel phenotypic (infected-cell) assays and target-based (on several essential enzymes) assays were continued in the second year of the project, totalling >1.5 millions compounds screened. During the screening process, profiling assays in translation models were set up and tools were built for target deconvolution of the hits. A great deal of enzyme/HTP assays, structures, and mode of action have also been determined and published, to feed drug discovery. The small molecule drug discovery efforts performed within CARE have led to the identification of several antiviral compound series with innovative mechanism of action which can form the basis of preventive or therapeutic interventions against coronaviruses. A selection of compound series is being developed towards candidate drugs and proof-of-concept in an infectious animal model has been obtained for a first compound.
CARE has delivered two well-characterized potent monoclonal antibodies CH-P5C3 and CH-P2G3 that were isolated from human donor B cells. CH-P2G3 displays picomolar-range neutralizing activity against omicron and all other current variants and is thus markedly more potent than all authorized or clinically advanced anti-SARS-CoV-2 mAbs. Both antibodies showed complete prophylactic protection in hamsters challenged with infection with the 2019-nCoV SARS-CoV-2 virus. The epitopes for CH-P5C3 and CH-P2G3 do not overlap thereby allowing both antibodies to bind to the Spike protein simultaneously and greatly reducing the risk of escape mutants.
OMICS experiments (transcriptomics, proteomics and metabolomics) are ongoing to evaluate the physiopathology of SARS-CoV-2 infection. This will complement the first analyses of the samples from French and Swiss COVID-19 cohorts which highlighted neutrophil activation as a hallmark of severe disease and CD177 assessment as a reliable prognostic marker for routine care. CARE animal models, which include two mouse models, a syrian hamster model and a non-human primate model, have been validated and are now being use to test the fits compounds.
The set-up of a Clinical Trial Platform has been comleted in preparation for the conduct of CARE clinical trials. The platform covers different aspects that can be helpful in speeding up the setup and conduct of a clinical trial. The clinical trial platform also offers services that may be of interest to stakeholders outside who are looking for a clinical trial network with a specific expertise in COVID 19.
In the second period of the project, the CARE consortium has continued its interaction with other organizations, IMI-initiatives, and key regulatory players to best respond to the public emergency health caused by the SARS-CoV-2 pandemic.
The CARE network of public-private collaborating teams enables the implementation of infrastructure fostering the discovery and development of candidates to respond to the current and potential future cornavirus pandemics. The delivery of novel screening capabilities on SARS-CoV2 targets have been established generating hits suitable for further development into drugs. Expertise on SARS-CoV2 targets extends beyond CARE partners to provide know-how and independent evaluation of external hits. The joint efforts of teams from private as well as public organizations allowed the application of a variety of different approaches to identify potential starting points for hit-to-lead campaigns. Multiple private and academic organizations are working together to integrate data on the efficacy, pharmacokinetics and safety of compounds in animal models and to identify potential immediate assets of value for the current outbreak and for future outbreaks. Apart from providing a basis for the conduct of Phase 1 and Phase 2 clinical trials, the clinical trial platform will be made accessible to outside entities including academic institutions, private companies and patients with an interest in conducting and participating in COVID-19 trials. The collaboration between the different teams from private and public organizations can be taken as an example for joint drug development for other future health emergencies.

It is now recognized that antiviral drugs will be needed during and after the SARS-CoV-2 pandemic, as well as to prepare for potential future coronavirus outbreaks. The availability of a potent, broad-spectrum anti-coronavirus drug will allow treatment of patients (such as transplant patients or individuals with other immune system deficiencies) that cannot be vaccinated, as well as rapid deployment after the detection of a spill-over event or outbreak with a new coronavirus. As such, chemotherapeutical containment will be instrumental in halting the current SARS-CoV-2 pandemic, and preventing the social-economic burden of the next one.