PubMed:10580645 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PubMed/sourceid/10580645","sourcedb":"PubMed","sourceid":"10580645","source_url":"http://www.ncbi.nlm.nih.gov/pubmed/10580645","text":"CFTR antisense phosphorothioate oligodeoxynucleotides (S-ODns) induce tracheo-bronchial mucin (TBM) mRNA expression in human airway mucosa.\nMucus hypersecretion is a critical component of cystic fibrosis (CF) pathogenesis. The effects of dysfunction of the cystic fibrosis transmembrane regulator (CFTR) on mucin expression were examined using the tracheo-bronchial mucin (TBM) gene as an indicator. TBM mRNA expression was assessed in a human bronchial epithelial cell line (HBE1) and human nasal mucosal explants in vitro. Antisense phosphorothioate oligodeoxynucleotides (S-ODN) to TBM suppressed baseline expression of TBM mRNA in both systems, but had no effect on glyceraldehyde phosphate dehydrogenase mRNA (GAPDH) expression. Sense and missense (multiple scrambled control oligonucleotides) S-ODNs had no effect. 8Br-cAMP and PGE1 significantly elevated TBM mRNA expression. These increases were also specifically inhibited by the antisense S-ODNs. In order to induce a CF-like state, S-ODN to CFTR were added to explants. Antisense CFTR S-ODNs were anticipated to reduce the expression of cellular CFTR protein, and the level of CFTR function. Antisense, but not sense or missense, CFTR S-ODN significantly increased TBM mRNA expression. These data suggest that mucin hypersecretion in CF may be a direct consequence of CFTR dysfunction; the specific mechanism through which this effect is mediated is not 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