Regulatory respiratory data refinement with reduced animal usage
| Autor: | Aileen Milne, Louise Sladen, Kevin Norton, Rommel Matheson |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Animal Experimentation Male Respiratory rate Toxicology 030226 pharmacology & pharmacy 03 medical and health sciences 0302 clinical medicine Theophylline Administration Inhalation Tidal Volume Plethysmograph Medicine Animals Telemetry Respiratory function Dosing Respiratory system Rats Wistar Tidal volume Plethysmography Whole Body Pharmacology Cross-Over Studies business.industry Safety pharmacology Crossover study Bronchodilator Agents Rats 030104 developmental biology Anesthesia Models Animal Respiratory Mechanics business |
| Zdroj: | Journal of pharmacological and toxicological methods. 93 |
| ISSN: | 1873-488X |
| Popis: | Introduction Assessment of effects of potential drug candidates on the respiratory system is part of the regulatory preclinical safety assessment conducted prior to first in human trials (FTIH). Commonly, this is carried out utilizing head out plethysmography (HOP) or whole body plethysmography (WBP) which record only ventilatory parameters. When dosing via the inhaled route a more thorough respiratory assessment, including a direct measure of airway mechanics, is desirable. The aim of the present work was to improve the strategy for respiratory safety testing by a) evaluating a telemetered pleural pressure – HOP (PP-HOP) model and b) evaluating a crossover study design protocol in the WBP model to reduce variability and animal usage. Methods For the PP- HOP model, rats were surgically implanted with a telemetry device for measurement of pleural pressure. Animals were placed in HOP tubes and respiratory function assessed when exposed to methacholine at doses of 0 (saline only), 0.42, 1.6 and 3.8 mg/kg. WBP assessment was performed in rats in a crossover study design when treated with theophylline at doses of 0 (saline only), 3, 10 and 30 mg/kg. Results Data from the PP-HOP study confirmed the expected changes in ventilatory parameters and airway mechanics in response to inhaled methacholine, including an increase in pulmonary resistance and decrease in tidal volume. Data from the WBP crossover study demonstrated similar sensitivity and statistical power to detect changes in respiratory rate and tidal volume to a standard parallel group design. Conclusion Measurement of PP-HOP in a stand-alone safety pharmacology study in conjunction with HOP assessment conducted as part of a toxicology study, represents an improved respiratory testing strategy for inhaled drugs. For compounds administered by other routes, we conclude that use of WBP using a crossover dosing design is a suitable alternative to parallel dosing groups, with a significant reduction in animal numbers and no loss of statistical power. |
| Databáze: | OpenAIRE |
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