Mucus transport is a fundamental component of the innate defense of the lung. In many environmental and genetic airways diseases, abnormal mucus transport produces mucus adhesion and, hence, retention. Mucus adhesion drives the pathogenesis of bronchitis by generating airflow obstruction, inflammation, and infection. Perhaps the best documented examples of mucus adhesion-driven bronchitis include patients with acute viral infections, prolonged intubation, and/or CNS disease. In a related context, acute exacerbations (AEs) associated with COPD, CF, and PCD often reflect a component of bronchitic spread to previously normal areas of the lung. Thus, in pulmonary medicine, there is a general need for agents that clear adherent mucus from airways surfaces to provide both symptomatic relief and slow/stop disease progression. Accordingly, our goal is to develop a novel mucolytic to be used as a single agent, or in combination of hydrating agents, to treat mucus retention in patients in need thereof. Based on a novel two-gel hypothesis to better describe the mucociliary apparatus, biophysical formulations have been developed to describe mucus flow in health and failure of flow in disease. These formulations have been extended to analyze the properties of mucus that becomes adherent in disease states and identify strategies to restore transport. We have developed cough machines and other biophysical assays to measure the biophysical forces that generate adhesion and search for pharmacologic agents to restore clearance. This search led to a focus on disulfide bond reducing agents as key additive/synergistic agents with hydrating agents. Inhaled N-acetylcysteine (NAC) has failed in pulmonary medicine because of the poor intrinsic activity of the compound and short half-life on airway surfaces. Consequently, a chemistry program was initiated to identify superior thiol-based scaffolds (e.g., including DTT scaffolds) and apply strategies from related chemistry programs to increase the activity of thiol-based reducing agents and to increase their residence time on airway surfaces. These approaches led to the selection of a lead compound (P2062) that exhibits greatly increased activity over other thiol-based mucolytics (~1,000X), is more durable (longer t1/2) on airway surfaces, and limits cellular penetration and hence has safety advantages over NAC. Our novel reducing agents are active in reducing both MUC5AC and MUC5B in COPD sputum, clearing adherent mucus from the ?ENaC mouse model, clearing adherent mucus from the rhino/sinus cavity from primary ciliary dyskinesia mice, and restoring mucus clearance in neutrophil elastase treated sheep by the tracheal mucus velocity assay. Strategies to optimize P2062 and generate a clinical candidate are outlined in a four tier approach in Specific Aim 1, which focuses on both increases in safety and efficacy. Processes required to move the clinical lead to an IND are outlined in Specific Aim 2, including all of the IND requiring medicinal chemistry, toxicology, ADME, and PK studies. We anticipate immediate initiation of Phase I trials at the end of the CADET funding period.

Public Health Relevance

There is a general need in pulmonary medicine to acutely remove mucus that obstructs the airways of the lung in a spectrum of pulmonary patients. Such patient populations include those with acute viral illnesses, including influenza, and patients in the in-hospital setting following intubation for surgery, trauma, and/or neuromuscular disease. COPD, the third leading cause of death in the US is also associated with increased mucus obstruction, and these patients are in need of agents to treat this component of their disease.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Exploratory/Developmental Cooperative Agreement Phase II (UH3)
Project #
5UH3HL123645-04
Application #
9325559
Study Section
Special Emphasis Panel (ZHL1)
Program Officer
Punturieri, Antonello
Project Start
2014-09-22
Project End
2019-06-30
Budget Start
2017-07-01
Budget End
2018-06-30
Support Year
4
Fiscal Year
2017
Total Cost
Indirect Cost
Name
University of North Carolina Chapel Hill
Department
Internal Medicine/Medicine
Type
Schools of Medicine
DUNS #
608195277
City
Chapel Hill
State
NC
Country
United States
Zip Code
27599
Livraghi-Butrico, Alessandra; Wilkinson, Kristen J; Volmer, Allison S et al. (2018) Lung disease phenotypes caused by overexpression of combinations of ?-, ?-, and ?-subunits of the epithelial sodium channel in mouse airways. Am J Physiol Lung Cell Mol Physiol 314:L318-L331
Chen, Gang; Volmer, Allison S; Wilkinson, Kristen J et al. (2018) Role of Spdef in the Regulation of Muc5b Expression in the Airways of Naive and Mucoobstructed Mice. Am J Respir Cell Mol Biol 59:383-396
Ge, Ting; Grest, Gary S; Rubinstein, Michael (2018) Nanorheology of Entangled Polymer Melts. Phys Rev Lett 120:057801
Zhou, Jinsheng; Wang, Yanqian; Menard, Laurent D et al. (2017) Enhanced nanochannel translocation and localization of genomic DNA molecules using three-dimensional nanofunnels. Nat Commun 8:807
Wagner, Caroline E; Turner, Bradley S; Rubinstein, Michael et al. (2017) A Rheological Study of the Association and Dynamics of MUC5AC Gels. Biomacromolecules 18:3654-3664
Donoghue, Lauren J; Livraghi-Butrico, Alessandra; McFadden, Kathryn M et al. (2017) Identification of trans Protein QTL for Secreted Airway Mucins in Mice and a Causal Role for Bpifb1. Genetics 207:801-812
Everaers, Ralf; Grosberg, Alexander Y; Rubinstein, Michael et al. (2017) Flory theory of randomly branched polymers. Soft Matter 13:1223-1234
Peters, Brandon L; Pike, Darin Q; Rubinstein, Michael et al. (2017) Polymers at Liquid/Vapor Interface. ACS Macro Lett 6:1191-1195
Simon, Joseph R; Carroll, Nick J; Rubinstein, Michael et al. (2017) Programming molecular self-assembly of intrinsically disordered proteins containing sequences of low complexity. Nat Chem 9:509-515
Sandefur, Conner I; Boucher, Richard C; Elston, Timothy C (2017) Mathematical model reveals role of nucleotide signaling in airway surface liquid homeostasis and its dysregulation in cystic fibrosis. Proc Natl Acad Sci U S A 114:E7272-E7281

Showing the most recent 10 out of 20 publications