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In vivo incorporation of3H-choline in alveolar type-II pneumocytes in mice treated with butylated hydroxytoluene (BHT)

An electron microscopic radioautographic study

Summary

Butylated hydroxytoluene has been previously shown to damage alveolar type-I cells followed by proliferation of type-II pneumocytes which then redifferentiate into intermediate and newly formed type-I epithelial cells. In relation to this transformation process, in vivo incorporation of H3-choline, a precursor of the main component of lung surfactant, was studied in type-II cells of BHT-treated mice by electron microscopic radioautography. The labeling density was reduced in some type-II cells at 2, 3 and 5 days after a single injection of BHT. Cellular compartment analysis indicated that the transformation of type-II cells is accompanied by a notable loss of their lamellar body component as well as a decreased radioautographic labeling associated with this cell type, possible in relation with modified synthesis of phospholipid material of surfactant.

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Supported by MRC of Canada Grant no. 6151 and NSERC of Canada Grant no. G. 0157

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Chevalier, G., Witschi, H.P. & Côté, M.G. In vivo incorporation of3H-choline in alveolar type-II pneumocytes in mice treated with butylated hydroxytoluene (BHT). Virchows Archiv B Cell Pathol 38, 273 (1981). https://doi.org/10.1007/BF02892822

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  • DOI: https://doi.org/10.1007/BF02892822

Key words

  • BHT
  • Lung
  • Choline
  • Radioautography
  • Ultrastructure