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Method for Pulmonary Administration Using Negative Pressure Generated by Inspiration in Mice.

Yuki Oiso1, Tomomi Akita1,2, Daiki Kato1

  • 1Department of Pharmaceutics and Drug Delivery, Faculty of Pharmaceutical Sciences, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

Pharmaceutics
|February 29, 2020
PubMed
Summary

A novel negative pressure method allows mice to self-inhale liquid medications for respiratory disease research. This technique ensures accurate drug delivery and avoids lung injury, proving effective in an emphysema model.

Keywords:
all-trans-retinoic acidchronic obstructive pulmonary diseasepulmonary administration

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Area of Science:

  • Pharmacology
  • Respiratory Medicine
  • Animal Models

Background:

  • Pulmonary drug delivery is crucial for respiratory disease research.
  • Conventional methods often involve pressure, risking lung injury in animal models.
  • Developing safer, more accurate pulmonary administration techniques is essential.

Purpose of the Study:

  • To evaluate a novel negative pressure self-inhalation method for pulmonary drug administration in mice.
  • To assess the accuracy of drug distribution and the potential for lung injury using this method.
  • To determine the efficacy of this method in a murine emphysema model.

Main Methods:

  • Institute of Cancer Research (ICR) mice were administered liquid medications (methylene blue tetrahydrate, saline, porcine pancreatic elastase, all-trans-retinoic acid) via negative pressure self-inhalation.
  • Drug distribution and lung histology were assessed.
  • A murine emphysema model was created, and therapeutic effects were evaluated.

Main Results:

  • The negative pressure method demonstrated accurate distribution of the dye.
  • No lung injury, such as disrupted blood flow or alveolar destruction, was observed.
  • The murine emphysema model showed a mean linear intercept (Lm) of 78 ± 4 μm.
  • Administration of all-trans-retinoic acid (ATRA) showed a significant therapeutic effect.

Conclusions:

  • The negative pressure self-inhalation method is a safe and accurate technique for pulmonary drug administration in mice.
  • This method is suitable for non-clinical studies of respiratory diseases.
  • The study validates the use of this technique for drug efficacy testing in animal models.