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Dong L, Zhuang X. Insights into Inhalation Drug Disposition: The Roles of Pulmonary Drug-Metabolizing Enzymes and Transporters. Int J Mol Sci 2024; 25:4671. [PMID: 38731891 PMCID: PMC11083391 DOI: 10.3390/ijms25094671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2024] [Revised: 04/14/2024] [Accepted: 04/23/2024] [Indexed: 05/13/2024] Open
Abstract
The past five decades have witnessed remarkable advancements in the field of inhaled medicines targeting the lungs for respiratory disease treatment. As a non-invasive drug delivery route, inhalation therapy offers numerous benefits to respiratory patients, including rapid and targeted exposure at specific sites, quick onset of action, bypassing first-pass metabolism, and beyond. Understanding the characteristics of pulmonary drug transporters and metabolizing enzymes is crucial for comprehending efficient drug exposure and clearance processes within the lungs. These processes are intricately linked to both local and systemic pharmacokinetics and pharmacodynamics of drugs. This review aims to provide a comprehensive overview of the literature on lung transporters and metabolizing enzymes while exploring their roles in exogenous and endogenous substance disposition. Additionally, we identify and discuss the principal challenges in this area of research, providing a foundation for future investigations aimed at optimizing inhaled drug administration. Moving forward, it is imperative that future research endeavors to focus on refining and validating in vitro and ex vivo models to more accurately mimic the human respiratory system. Such advancements will enhance our understanding of drug processing in different pathological states and facilitate the discovery of novel approaches for investigating lung-specific drug transporters and metabolizing enzymes. This deeper insight will be crucial in developing more effective and targeted therapies for respiratory diseases, ultimately leading to improved patient outcomes.
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Affiliation(s)
| | - Xiaomei Zhuang
- Beijing Institute of Pharmacology and Toxicology, Beijing 100850, China;
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West RJ, Burleson S, Gulledge T, Miller JW, Chappelle AH, Krieger S, Graham C, Snyder S, Simon G, Plehiers PM. Exploring structure/property relationships to health and environmental hazards of polymeric polyisocyanate prepolymer substances-2. Dermal sensitization potential in the mouse local lymph node assay. Toxicol Ind Health 2022; 38:556-577. [PMID: 35624531 DOI: 10.1177/07482337221089587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The sensitization potencies of twenty custom-designed monomer-depleted polymeric polyisocyanate prepolymer substances and their associated toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), hexamethylene diisocyanate (HDI), and isophorone diisocyanate (IPDI) monomer precursors were investigated by means of the mouse Local Lymph Node Assay (LLNA). These polymeric prepolymers were designed to represent the structural features and physical-chemical properties exhibited by a broad range of commercial polymeric polyisocyanate prepolymers that are produced from the reaction of aromatic and aliphatic diisocyanate monomers with aliphatic polyether and polyester polyols. The normalization of LLNA responses to the applied (15-45-135 mM) concentrations showed that the skin sensitization potency of polymeric polyisocyanate prepolymers is at least 300 times less than that of the diisocyanate monomers from which they are derived. The sensitization potency of the prepolymers was shown to be mainly governed by their hydrophobicity (as expressed by the calculated octanol-water partition coefficient, log Kow) and surfactant properties. Neither hydrophilic (log Kow <0) nor very hydrophobic (log Kow >25) prepolymers stimulated lymphocyte proliferation beyond that of the dosing vehicle control. The findings of this investigation challenge the generally held assumption that all isocyanate (-N=C=O) bearing substances are potential skin (and respiratory) sensitizers. Further, these findings can guide the future development of isocyanate chemistries and associated polyurethane applications toward reduced exposure and health hazard potentials.
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Affiliation(s)
- Robert J West
- 550512International Isocyanate Institute, Inc, Mountain Lakes, NJ, USA
| | | | - Travis Gulledge
- Currently Burleson Research Technologies, StrideBio Inc, Durham, NC, USA
| | - Jason W Miller
- Environmental Analytics, Covestro LLC, Pittsburgh, PA, USA
| | - Anne H Chappelle
- 550512International Isocyanate Institute, Inc, Mountain Lakes, NJ, USA
| | - Shannon Krieger
- 5470Toxicology and Environmental Research and Consulting, The Dow Chemical Company, Midland, MI, USA
| | | | - Stephanie Snyder
- Environmental Analytics, Covestro LLC, Pittsburgh, PA, USA.,Product Safety and Regulatory Affairs, Covestro LLC, Pittsburgh, PA, USA
| | - Glenn Simon
- Simon Toxicology, LLC, Raleigh, NC, USA (Consultant to Vencorex US, Inc.)
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