期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1990
卷号：87
期号：19
页码：7588-7592
DOI：10.1073/pnas.87.19.7588
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：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.
