Surfactant protein D gene regulation. Interactions among the conserved CCAAT/enhancer-binding protein elements

The Journal of Biological Chemistry
Yanchun He, E C Crouch

Abstract

Surfactant protein D (SP-D) plays roles in pulmonary host defense and surfactant homeostasis and is increased following acute lung injury. Given the importance of CCAAT/enhancer-binding protein (C/EBP)-binding elements in the systemic acute-phase response and lung development and the expression of C/EBP isoforms by lung epithelial cells, we hypothesized that conserved C/EBP motifs in the near-distal and proximal promoters contribute to the regulation of SP-D expression by C/EBPs. Five SP-D motifs (-432, -340, -319, -140, and -90) homologous to the C/EBP consensus sequence specifically bound to C/EBPs in gel shift assays, and four of the five sites (-432, -340, -319, and -90) efficiently competed for the binding of C/EBPalpha, C/EBPbeta, or C/EBPdelta to consensus oligomers. Cotransfection of C/EBPalpha, C/EBPbeta, or C/EBPdelta cDNA in H441 lung adenocarcinoma cells significantly increased the luciferase activity of a wild-type SP-D promoter construct containing 698 bp of upstream sequence (SS698). Transfection of C/EBP also increased the level of endogenous SP-D mRNA in H441 cells. Transactivation of the reporter construct was abrogated by deletion of sequences upstream of -205. Independent site-directed mutagenesis of the sit...Continue Reading

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