Development of Inhaled PPI for Treatment of Pulmonary Fibrosis

DESCRIPTION provided by applicant Altitude Pharma Inc is developing a novel inhaled form of a generic drug proton pump inhibitor PPI for the treatment of idiopathic pulmonary fibrosis IPF and or radiation induced lung fibrosis RILF orphan indications with severely limited treatment options In both forms accumulation of fibrous tissue in the lung parenchyma induces a restrictive physiology that impairs respiration and leads to death within years from the time of diagnosis Although the etiology of IPF is not known RILF is sequelae of exposure to ionizing radiation and or chemotherapy used to treat thoracic malignancies For IPF the prevalence and incidence in the US is reported to be cases per and cases per respectively Recently a number of retrospective or prospective case series studies that reviewed interstitial lung disease ILD databases have reported that IPF patients placed on andquot anti acidandquot therapy mainly on PPIs appear to have improved outcomes in measures of lung function and overall health including longer period of lung transplant free survival reduced baseline fibrotic score on High Resolution Computed Tomography HRCT evaluation reduced hospitalization for pulmonary related illnesses and significantly reduced episodes of acute exacerbations Intriguingly the Official Clinical Practice Guideline endorsed by all major Thoracic Societies ATS ERS JRS ALAT recommended the use of PPIs for the treatment of IPF However there is no prospective study evaluating the use of PPIs in IPF In addition the potential mechanism by which the PPIs improve measures of lung function and or transplant free survival in IPF has not been elucidated Recently we demonstrated that a prototype PPI esomeprazole possesses potent anti inflammatory antioxidant and antifibrotic properties and directly regulates processes involved in the development and progression of inflammation and tissue remodeling We demonstrate the pleiotropic effect of esomeprazole using in vitro studies of primary lung cells exposed to bleomycin or ionizing radiation Remarkably our recent data also shows that esomeprazole when administered orally showed robust efficacy in mitigating the inflammatory and fibrotic responses in a rodent model of chemotherapy bleomycin induced lung injury Accordingly the major goal of this project is to determine if PPIs might be reformulated to treat lung fibrosis This strategy is anticipated to deliver sufficient amount of drug directly to the lungs in order to improve overall lung function and avoid PPI related systemic side effects Accordingly we aim to complete the formulation of an inhalable PPI that provides optimal biophysical biological properties for localized delivery conduct safety and tolerability studies including comprehensive drug profiling and conduct efficacy studies in two mouse models of experimentally induced lung injury i e bleomycin and ionizing radiation This Phase I SBIR grant will allow Altitude to rapidly execute essential studies in order to launch Good Laboratory Practice GLP activities and pre IND meetings with the FDA PUBLIC HEALTH RELEVANCE Pulmonary fibrosis is a deadly disease that is manifested by inflammation and scarring of the lungs that contribute to severe and persistent shortness of breath and eventual death if left untreated Although there is no effective treatment for this disease recent retroactive research conducted in humans suggests that proton pump inhibitors PPIs such as esomeprazole Nexium improve lung function in patients suffering from pulmonary fibrosis In this study we aim to evaluate PPIs for the treatment of lung fibrosis by prospectively testing their efficacy in reducing lung inflammation and scarring in animal models that mimic the human disease