A murine model of smoke inhalation

Area of Science:

• Toxicology
• Pulmonary Medicine
• Animal Models

Background:

• The United States faces high fire death rates, with smoke inhalation being the primary cause of mortality in structural fires.
• Existing animal models do not fully replicate human responses to smoke inhalation, hindering therapeutic development.

Purpose of the Study:

• To develop and validate a controlled murine model of smoke inhalation.
• To investigate the dose-dependent mortality and pathological effects of wood smoke exposure in mice.

Main Methods:

• Design and implementation of a controlled-environment smoke chamber for reproducible smoke exposure.
• Exposure of CD-1 mice to varying quantities of combusted wood, cotton, or polyurethane smoke.
• Assessment of mortality, blood carboxyhemoglobin levels, and detailed histopathological analysis of lung tissues and bronchoalveolar lavage fluid.

Main Results:

• A direct relationship was established between the quantity of wood combusted and mouse mortality.
• Lethal (78%) and sublethal (50%) carboxyhemoglobin levels were achieved, mirroring human outcomes.
• Wood smoke exposure induced significant lung pathology, including type II cell changes, inflammation, hemorrhage, and edema, comparable to human victims.

Conclusions:

• The developed murine model accurately replicates key pathological features of human smoke inhalation injury.
• This model provides a valuable platform for investigating the mechanisms of smoke-induced lung injury and for testing novel therapeutic interventions.