Dl. Smith et al., PROXIMAL 2.6-KB OF 5'-FLANKING DNA IS INSUFFICIENT FOR HUMAN RENIN PROMOTER ACTIVITY IN RENIN-SYNTHESIZING CHORIO-DECIDUAL CELLS, Biochimica et biophysica acta, N. Gene structure and expression, 1219(2), 1994, pp. 465-474
In order to determine the influence of proximal 5'-flanking DNA of the
human renin gene (REN) in cells that express human renin, transient e
xpression analyses were carried out in chorio-decidual cells. Construc
ts containing different lengths of REN promoter DNA, extending as far
as 2595 bp upstream of the transcription start site, were unable to dr
ive transcription of a chloramphenicol acetyl transferase reporter gen
e in chorio-decidual cells, nor in noncognate 293 or JEG-3 cells. The
tk promoter was similarly inactive in constructs containing -2595 to -
453 fragments of REN 5'-flanking DNA. In each cell type, the -2595 to
-1300 DNA exerted a negative influence. Additional promoter- and cell
type-dependent negative influences were noted for other regions of REN
5'-flanking DNA and the -453 to -145 DNA increased tk promoter activi
ty 2.5-fold in chorio-decidual cells. By introducing the SV40 enhancer
into constructs, a weak stimulation of the REN promoter was observed
in chorio-decidual cells, but not in noncognate, JEG-3 cells, although
the -2595 to -1300 DNA retained its negative influence in the cognate
cell type. These results show that the proximal 2.6 kb of REN S-flank
ing DNA is unable to drive reporter gene activity in renin-synthesizin
g, chorio-decidual cells under basal conditions and suggest that trans
-acting factors unique to at least this cell type, together with enhan
cer(s) located outside of the proximal 2.6 kb of REN promoter DNA test
ed, could be required for human renin promoter activity.