Inhaled dry powder formulation of broad-spectrum antiviral towards COVID-19 and influenza

Inhaled dry powder formulation of broad-spectrum antiviral towards COVID-19 and influenza

SEM picture of inhaled tamibarotene powder formulation at x5,000 magnification. Credit score: The College of Hong Kong

The collaborative analysis workforce fashioned by the Division of Pharmacology and Pharmacy and Division of Microbiology, LKS School of Medication, The College of Hong Kong (HKUMed), has developed an inhalable dry powder formulation of tamibarotene, a repurposed drug that displays broad-spectrum antiviral exercise towards SARS-CoV-2, MERS-CoV and influenza A H1N1 virus following pulmonary supply. The work has been revealed on-line in Superior Therapeutics in June 2021.

In response to the unpredictable epidemic and pandemic outbreaks of influenza and coronavirus, early administration of a broad-spectrum antiviral agent may very well be an efficient technique to regulate the unfold of respiratory infections. The HKUMed analysis workforce has beforehand reported {that a} retinoid spinoff, AM580, demonstrated broad-spectrum antiviral exercise towards coronaviruses (MERS-CoV, SARS-CoV and SARS-CoV-2) and influenza virus.

An analog of AM580, tamibarotene, is an orally lively retinoid spinoff for the therapy of acute promyelocytic leukemia at present marketed in Japan. With an antiviral exercise similar to AM580, tamibarotene has a longtime security profile in human with milder adversarial results than different retinoid derivatives. Tamibarotene is accessible as an oral pill, which is tough to realize sturdy antiviral exercise within the respiratory tract as a result of insufficient lung distribution following oral administration. When excessive dose is run to compensate the inadequate lung distribution, poisonous unwanted side effects are anticipated due to the intensive systemic publicity.

Inhaled dry powder formulation of broad-spectrum antiviral against COVID-19 and influenza
Images of spray-freezing step in spray freeze drying course of. Liquid is fed right into a nozzle and atomised into fantastic droplets. These droplets fall into liquid nitrogen (contained in the white styrofoam container) and turn into frozen. Credit score: The College of Hong Kong

Against this, pulmonary supply is a non-invasive administration route that may maximize native focus within the lung and cut back systemic publicity, thereby lowering the danger of adversarial results and bettering therapeutic efficacy. Inhaled powder formulation of broad-spectrum antiviral drug can be utilized on outpatient foundation because of the ease of (self-)administration as prophylaxis and therapy for respiratory viral infections.

Inhaled dry powder formulation of tamibarotene was ready by spray freeze drying, a particle engineering method that mixes spray freezing and freeze drying to supply particles with wonderful aerosol properties for inhalation. The HKUMed analysis workforce discovered {that a} prophylactic dose of tamibarotene powder delivered by intratracheal administration considerably decreased virus titer and viral RNA load of SARS-CoV-2 within the hamsters’ lungs, and the antiviral efficacy was similar to intratracheally administered remdesivir. The broad-spectrum anti-coronavirus exercise of inhaled tamibarotene powder was additionally demonstrated in MERS-CoV-infected mice mannequin as pre-challenge prophylaxis. Furthermore, exceptional anti-influenza exercise of tamibarotene powder formulation was demonstrated by the improved survival price of mice and alleviated illness severity when administered both intratracheally as prophylaxis or intranasally as therapy.

“At present, there is no such thing as a inhaled powder formulation of antiviral out there in the marketplace for COVID-19 therapy. Tamibarotene dry powder with broad-spectrum antiviral exercise presents a brand new technique for COVID-19 administration, particularly as prophylaxis and therapy for outpatients when in-patient healthcare can’t be offered,” mentioned Dr. Jenny Lam, affiliate professor, Division of Pharmacology and Pharmacy, HKUMed, who initiated the examine. “With the favorable security profile of tamibarotene and primarily based on the findings within the current examine, medical trials evaluating inhaled tamibarotene for its security and as at-home therapy for COVID-19 may very well be thought-about.”

Since tamibarotene exerts its antiviral exercise by concentrating on lipid metabolism within the host cells, it’s advantageous in responding to mutated or drug-resistant virus strains. Extra importantly, by demonstrating antiviral efficacy towards SARS-CoV-2 and H1N1 virus in respective animal fashions, inhaled tamibarotene presents a potential answer for COVID-19 and influenza co-infection.


Scientists uncover potential antiviral therapy for COVID-19


Extra data:
Qiuying Liao et al, Inhaled Dry Powder Formulation of Tamibarotene, a Broad‐Spectrum Antiviral towards Respiratory Viruses Together with SARS‐CoV‐2 and Influenza Virus, Superior Therapeutics (2021). DOI: 10.1002/adtp.202100059

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The College of Hong Kong


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Inhaled dry powder formulation of broad-spectrum antiviral towards COVID-19 and influenza (2021, July 27)
retrieved 28 July 2021
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