Arrowhead Pharmaceuticals Presents New Preclinical Data on ARO-ENaC for Treatment of Cystic Fibrosis
ARO-ENaC is an inhaled RNA interference (RNAi) therapeutic targeting the epithelial sodium channel alpha subunit (αENaC) for the treatment of CF, a rare disease caused by a genetic mutation that leads to mucus buildup in the lungs and pancreas. CF patients can have difficulty breathing and experience frequent and persistent lung infections. Increased ENaC activity contributes to drying mucus in the airway and a reduced ability of the lung to clear toxins and infectious agents. Inheritance of poorly functioning ENaC genes by CF patients leads to milder lung disease.
Researchers have been interested in developing therapeutics that decrease ENaC activity in CF patients. However, the development of inhaled small molecule inhibitors has been limited by their short duration of action and unwanted effects resulting from ENaC inhibition in the kidney. ARO-ENaC is designed specifically to address those deficiencies by selectively reducing ENaC in the lung, while sparing the kidney, with a long duration of effect.
A poster titled, “Targeting αENaC with an epithelial RNAi trigger
delivery platform for the treatment of cystic fibrosis,” was presented
- Integrin αvβ6 receptor ligands improve endocytosis of RNAi triggers in cultured epithelial cells
- Conjugates employing targeting ligands to the integrin αvβ6 receptor improve functional delivery of an αENaC RNAi trigger to the pulmonary epithelium after inhalation, producing deeper and more consistent reduction of whole lung αENaC mRNA at lower doses
- Loss of airway epithelial αENaC protein expression is observed at exposures that produce approximately 50% reduction in whole lung αENaC mRNA, with remaining protein expressed in alveolar epithelium
- Reduction of lung αENaC mRNA expression is durable, maintaining greater than the target level of 50% knockdown at 3 weeks post-dose and requiring 6-7 weeks for recovery to baseline expression
- Aerosol inhalation improves delivery efficiency approximately tenfold over intratracheal administration
- Conjugates were well-tolerated with no observed changes in renal αENaC mRNA expression
- The ability of the TRiM™ platform to facilitate functional delivery of RNAi triggers to the lung suggests that additional therapeutic targets in the pulmonary epithelium could be considered, particularly those that are currently inaccessible to traditional small molecule or antibody approaches
A copy of presentation materials may be accessed on the Events and Presentations page under the Investors section of the Arrowhead website.
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Arrowhead Pharmaceuticals, Inc.
Vince Anzalone, CFA
Investors and Media:
LifeSci Advisors, LLC