Transfer of a constitutive viral promoter-cystic fibrosis transmembrane conductance regulator cDNA to human epithelial cells conveys resistance to down-regulation of cAMP-regulated Cl- secretion in the presence of inflammatory stimuli Academic Article uri icon


MeSH Major

  • Chlorides
  • Cyclic AMP
  • Gene Expression Regulation
  • Membrane Proteins
  • Moloney murine leukemia virus
  • Tetradecanoylphorbol Acetate


  • The expression of the cystic fibrosis transmembrane conductance regulator (CFTR) gene can be down-regulated by inflammatory stimuli such as phorbol myristate acetate (PMA). Since the respiratory manifestations of cystic fibrosis (CF) are characterized by intense chronic airway inflammation very early in life, successful gene therapy for CF will require that expression of the transferred normal CFTR gene be resistant to down-regulation by inflammatory mediators. To evaluate the concept that a viral promoter--human CFTR cDNA unit would be resistant to this form of down-regulation, a retrovirus promoter (5' long terminal repeat of the Moloney murine leukemia virus)--human CFTR cDNA unit was transferred to T84 human colon carcinoma cell line using a retrovirus vector. Exposure of the retrovirus-modified T84 cells to PMA resulted in down-regulation of the endogenous CFTR mRNA transcripts (6.5 kb), but did not affect the level of exogenous CFTR transcripts (8.0 kb). Importantly, in parallel with the persistence of the exogenous CFTR transcripts, the modified cells still maintained cAMP-regulated CI- secretion in the presence of PMA. These in vitro data suggest that a constitutive viral promoter--CFTR cDNA unit should be resistant to modulation by inflammatory stimuli, a likely requirement for successful gene therapy for CF.

publication date

  • October 25, 1994



  • Academic Article



  • eng

PubMed Central ID

  • PMC308481

PubMed ID

  • 7526342

Additional Document Info

start page

  • 4470

end page

  • 6


  • 22


  • 21