Intranasal organic dust exposure-induced airway adaptation response marked by persistent lung inflammation and pathology in mice

AUTOR(ES)

Poole, Jill A.

FONTE

American Physiological Society

RESUMO

Organic dust exposure in agricultural environments results in an inflammatory response that attenuates over time, but repetitive exposures can result in chronic respiratory disease. Animal models to study these mechanisms are limited. This study investigated the effects of single vs. repetitive dust-induced airway inflammation in mice by intranasal exposure method. Mice were exposed to swine facility dust extract (DE) or saline once and once daily for 1 and 2 wk. Dust exposure resulted in increased bronchoalveolar lavage fluid neutrophils and macrophages after single and repetitive exposures. Lavage fluid TNFα, IL-6, keratinocyte chemoattractant, and macrophage inflammatory protein-2 were significantly increased after single and repetitive dust exposures, but were dampened in 2-wk dust-exposed mice compared with single exposure. Dust exposure induced PKCα and -ɛ activation in isolated tracheal epithelial cells but were dampened with repetitive exposures. Ex vivo stimulation of alveolar macrophages from 2-wk animals demonstrated reduced cytokine responsiveness and phagocytic ability. Significant lung pathology occurred with development of mixed mononuclear cellular aggregates (T and B lymphocytes, phagocytes) after repetitive dust exposure, a novel observation. Airway hyperresponsiveness to methacholine occurred after single dust exposure but resolved after 2 wk. Collectively, intranasal exposure to DE results in significant lung inflammatory and pathological responses marked by a modulated innate immune response to single and repetitive dust exposures that is associated with PKC activity.

Documentos Relacionados

• Dust exposure, dust recovered from the lung, and associated pathology in a group of British coalminers.
• Curcumin inhibits COPD-like airway inflammation and lung cancer progression in mice
• Immune Response Induced by Airway Sensitization after Influenza A Virus Infection Depends on Timing of Antigen Exposure in Mice
• The Relation Between Lung Dust and Lung Pathology in Pneumoconiosis*
• Chronic lung disease and occupational dust exposure