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Early bronchopulmonary lesions in rat lung after normobaric 100% oxygen exposure and their evolution

A light and electron microscopic study

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Summary

In order to clarify the early phenomena involved in the lung reaction to hyperoxia, twenty adult male rats were exposed to 100% oxygen at 1 ATA. Morphological pulmonary lesions were detectable after only 24 h hyperoxia, and included vasoconstriction and perivascular oedema, bronchiolar constriction, and pericyte reaction. The lesions were irregularly scattered within the lung parenchyma and occurred preferentially in areas centred on bronchiolo-vascular stems. Even at the latest stages, pulmonary heterogeneity was obvious, from the coexistence of areas damaged at different times. Neuro-epithelial-bodies were found under the bronchiolar epithelium; the morphological aspect of the neuro-endocrine cells observed was consistent with hyperoxia-induced modulation of their secretory activity. Taken together, our findings show the speed of development of hyperoxia-induced pulmonary changes and raise some pathogenic considerations.

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Porte, A., Mantz, J., Hindelang, C. et al. Early bronchopulmonary lesions in rat lung after normobaric 100% oxygen exposure and their evolution. Vichows Archiv A Pathol Anat 414, 135–145 (1989). https://doi.org/10.1007/BF00718593

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  • DOI: https://doi.org/10.1007/BF00718593

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