Effects of vitamin A-deprivation on hamster tracheal epithelium. A quantitative morphologic study - PubMed (original) (raw)
- PMID: 6143447
- DOI: 10.1007/BF02889865
Effects of vitamin A-deprivation on hamster tracheal epithelium. A quantitative morphologic study
E M McDowell et al. Virchows Arch B Cell Pathol Incl Mol Pathol. 1984.
Abstract
The effects of vitamin A-deprivation on the tracheal epithelium were studied in 35-day old hamsters that had been raised since birth on a vitamin A-deficient diet. Colchicine and 3HTdR were given 6 hours before death and the proliferative activities of basal cells and mucous cells were quantified separately by 3HTdR labeling indices and mitotic rates. Vitamin A-deprivation decreased replication of basal cells and mucous cells in tracheal epithelium which showed minimal morphologic change. The mitotic rates and labeling indices were reduced 3 to 4-fold in basal cells and 14-fold in mucous cells (analyzed as percent of total number of each cell type) compared with controls. Thus, replication of mucous cells was more inhibited by lack of vitamin A, than replication of basal cells. The disparate hypoplasia of basal cells and mucous cells in epithelium showing minimal change, resulted in a relative increase in the proportion of basal cells and a relative decrease in the proportion of mucous cells, which could be erroneously interpreted as "basal cell hyperplasia". Proportions of preciliated and ciliated cells were also decreased compared to controls. At foci of stratification and epidermoid metaplasia, cell replication rates were increased over controls and more than 70% of all mitotic activity was associated with "non-basal" cells. Genesis of these lesions was coincident with cell death and cell loss. The histogenesis of stratification and epidermoid metaplasia was characterized. Morphological evidence indicated that these lesions were closely related histogenetically and were composed, for the most part, of altered mucous cells which expressed dual phenotypes i.e. keratinization and mucus synthesis.
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