SP-A 3'-UTR is involved in the glucocorticoid inhibition of human SP-A gene expression

Russell R. Hoover, Joanna Floros

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56 Scopus citations


The synthetic glucocorticoid dexamethasone has a major inhibitory effect on human surfactant protein A1 (SP-A1) and SP-A2 gene expression that occurs at both the transcriptional and posttranscriptional levels. Toward the identification of cis-acting elements that may be involved in the dexamethasone regulation of SP-A mRNA stability, chimeric chloramphenicol acetyltransferase (CAT) constructs that contained various portions of SP-A1 or SP-A2 cDNA in place of the native CAT 3'-untranslated region (UTR) were transiently transfected into the lung adenocarcinoma cell line NCI-H441. CAT activity was reduced in NCI-H441 cells by exposure to 100 nM dexamethasone only for the chimeric CAT constructs that contained the SP-A 3'-UTR. Moreover, the inhibitory response seen with dexamethasone was greater for the 3'-UTR derived from the SP-A1 allele 6A3 than with the 3'-UTR derived from either the SP-A1 allele 6A2 or SP-A2 allele 1A0, indicating differential regulation between SPA genes and/or alleles.

Original languageEnglish (US)
Pages (from-to)L917-L924
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Issue number6 20-6
StatePublished - Jun 1999

All Science Journal Classification (ASJC) codes

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology


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