ENA Respiratory Advances INNA-051 Trials in Older and Young Adults

ENA Respiratory, a clinical-stage pharmaceutical company developing antiviral host defense immune enhancers to minimize the impact of viral respiratory infections in at-risk populations, announces that it has successfully completed dosing of the older adult cohorts in its phase Ib study of a dry powder formulation of INNA-051. Intranasal administration of the novel and more stable formulation of INNA-051 was well-tolerated and led to local activation of innate immune pathways gene expression.

The study was designed to test the safety, tolerability, pharmacodynamics, and pharmacokinetics of INNA-051 administered intra-nasally as a dry powder formulation, which has an anticipated shelf life of over two years at room temperature.

Thirty-two participants aged 60 or over were enrolled in the study. Participants included in the multiple ascending dose cohorts were dosed weekly on three occasions, with a maximum dose of 900 mcg (a 3-fold increase in the maximum dose included in the previous trial with the liquid formulation).  Treatment at all doses was well-tolerated, with mainly mild, short duration drug-related AEs limited to the upper respiratory tract. The tolerability observed at these higher doses is similar to the profile observed in previous trials with the liquid nasal spray formulation. Biomarker analysis of nasal samples confirmed that treatment leads to a significant local activation of the innate immune pathways, including antiviral host defense pathways, consistent with previous observations in the clinic.

The DOD-funded extension to assess safety, tolerability and pharmacodynamics of the new formulation in younger adults aged 18-45 is ongoing and will complete dosing later in January. The first cohort dosed with 300 mcg demonstrated that the new formulation safety and tolerability profile is consistent with observations in the older adults. Complete reporting of the study is expected in Q2 2025.

ENA Respiratory’s CEO, Christophe Demaison, PhD said: “These results provide an excellent foundation for our planned phase II Proof of Concept community infection study and reinforce INNA-051’s potential as a convenient, commercially attractive, seasonally-delivered product that minimizes the impact of common viral respiratory infections and prevents serious complications.

“Increased age is the biggest risk factor for morbidity and mortality from such infections and, in the US alone, there are 34.3 million adults aged 60 and over with comorbidities that put them at risk for viral respiratory infections. We have demonstrated that our extended shelf-life formulation of INNA-051 is well-tolerated in this population and triggers an immune response that we believe could be protective and prevent serious disease.”

ENA is currently planning Q4 2025 Phase II community infection study to assess the safety and potential efficacy of INNA-051 in reducing the incidence and duration of symptomatic infections caused by common respiratory viruses, including coronaviruses, seasonal influenza, rhinoviruses, respiratory syncytial virus and human metapneumovirus in young adults at risk for exposure living in the US.

ENA Respiratory is a clinical-stage pharmaceutical company tackling respiratory viral infections through the development of host defense immune enhancers which locally prime and boost the body’s innate immune response – the natural first line of defence against invading pathogens.

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