ATyr Pharma is planning to assess its drug candidate ATYR1923 in a Phase II clinical trial to treat severe respiratory complications in individuals with Covid-19.

The US Food and Drug Administration (FDA) accepted the investigational new drug (IND) application of the candidate in this Covid-19 indication.

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ATYR1923 is a fusion protein that specifically modulates neuropilin-2 to downregulate the innate and adaptive immune response in inflammatory diseases.

The drug candidate, being developed to treat interstitial lung diseases, is currently in a Phase Ib/IIa study involving patients with pulmonary sarcoidosis.

In preclinical studies, ATYR1923 was observed to downregulate T-cell responses, reducing the inflammatory cytokine and chemokine signalling linked to severe Covid-19.

Furthermore, the drug candidate improved lung function and also mitigated inflammation and fibrosis in multiple animal models with immune-mediated acute lung injury.

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ATyr Pharma president and CEO Dr Sanjay Shukla said: ā€œThe inflammatory lung injury related to Covid-19 may be similar to that of interstitial lung diseases, or ILDs, for which ATYR1923 is currently being investigated.

ā€œBy targeting aberrant immune responses, we believe that ATYR1923’s mechanism of action has substantial overlap with this disease pathology and presents a compelling opportunity to potentially treat this subset of Covid-19 patients for which there are no approved therapies.”

The randomised, double blind, placebo-controlled Phase II study will evaluate ATYR1923 in 30 patients at up to ten centres in the US.

Participants will be given a single intravenous (IV) dose of either 1mg/kg or 3mg/kg ATYR1923 or placebo. The study aims to demonstrate safety and preliminary efficacy of the drug candidate.

According to data from a Phase Ib/IIa pulmonary sarcoidosis study, ATYR1923 was found to be generally safe and well tolerated without drug-related serious adverse events.