Cellulose after a single intratracheal dose (15 mg per animal) brought about fibrosing granulomatous alveobronchiolitis and an increase of IgA production in the bronchoalveolar lavage. Fibrosing alveolitis showed moderate progression as a function of time. With different morphological methods, injury of type I pneumocytes and the incomplete repair of type II pneumocytes were detected. The damage of the alveolar epithelium initiated and activated a series of processes that led to definite pulmonary alterations: pulmonary fibrosis leading to the disintegration of the alveolo-capillary morphological functional unit.
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Tátrai et al. (1996) studied this question.