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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1990 Oct;87(19):7588–7592. doi: 10.1073/pnas.87.19.7588

Regulation of human renin expression in chorion cell primary cultures.

K G Duncan 1, M A Haidar 1, J D Baxter 1, T L Reudelhuber 1
PMCID: PMC54793  PMID: 2217188

Abstract

The human renin gene is expressed in the kidney, placenta, and several other sites. The release of renin or its precursor, prorenin, can be affected by several regulatory agents. In this study, primary cultures of human placental cells were used to examine the regulation of prorenin release and renin mRNA levels and of the transfected human renin promotor linked to chloramphenicol acetyltransferase reporter sequences. Treatment of the cultures with a calcium ionophore alone, calcium ionophore plus forskolin (that activates adenylate cyclase), or forskolin plus a phorbol ester increased prorenin release and renin mRNA levels 1.3- to 6-fold, but several classes of steroids did not affect prorenin secretion or renin RNA levels. The transfected renin promoter (584 or 100 base pairs of 5'-flanking DNA) initiated at the correct start site in these cells and forskolin increased its expression 2.5- to 4-fold. Constructs containing renin 5'-flanking DNA linked to a heterologous promoter cotransfected into HeLa cells with either glucocorticoid or estrogen receptor expression vectors were not regulated by dexamethasone or 17 beta-estradiol. These results suggest that (i) the first 584 base pairs of the renin gene 5'-flanking DNA do not contain functional glucocorticoid or estrogen response elements, (ii) placental prorenin release and renin mRNA are regulated by calcium ion and by the combinations of cAMP with either C kinase or calcium ion, and (iii) the first 100 base pairs of the human renin 5'-flanking DNA direct accurate initiation of transcription and can be regulated by cAMP. Thus, some control of renin release in the placenta (and by inference in other tissues) occurs via transcriptional influences on its promoter.

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Selected References

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