PMID: 9187958Apr 1, 1997Paper

Differentiation of respiratory epithelium: the effects of retinoic acid and carcinogens on the expression of mucociliary vs. squamous phenotype

Inflammation
S N BhattacharyyaB Kaufman

Abstract

Changes in ultrastructural characteristics and mucin gene expression were examined in rat tracheal explants cultured in a synthetic medium +/- retinoic acid (RA), benzo[a]pyrene (B[a]P) and N-methyl-N-nitrosourea (NMNU). In the RA(+) cultures, no changes in either ultrastructural features or mucin gene expression were detected after 48 h incubation. After 96 h incubation, however, the ultrastructural features associated with the squamous phenotype were characteristics of cultures containing the two carcinogens and the mucin gene expression was slightly reduced. Thus, in the presence of retinoic acid, the carcinogen induced changes in cytology to the squamous phenotypes were not matched by a marked loss of mucin gene expression. Explants cultured for 48 h without RA and +/- carcinogens showed none of the cytological changes associated with onset of the squamous phenotype. While mucin mRNA was still detected, it was clearly reduced compared to 48 h cultures in RA(+) medium. However, 48 h later, all explants exhibited pronounced squamous metaplasia and the mucin message decreased to trace levels. Thus, the results of these experiments with B[a]P and NMNU in RA(+) and RA(-) media indicates that at least the early carcinogen induced...Continue Reading

Citations

Sep 30, 2000·Alimentary Pharmacology & Therapeutics·P N NewsomeJ N Plevris
Sep 18, 2020·Advanced Healthcare Materials·Sara PourshahrestaniAldo R Boccaccini
Jan 3, 2013·Advanced Healthcare Materials·Silvia M MihailaAli Khademhosseini
Nov 7, 2001·Toxicologic Pathology·L Calderón-GarcidueñasT Van Dyke
Feb 10, 2018·Acta Biomaterialia·Giriraj LokhandeAkhilesh K Gaharwar

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