As4.1 cells (ATCC #CRL2193), a renin-expressing cell line of renal origin that we developed by transgene-targeted tumorigenesis, are being used in concert with transgenic analyses in vivo to elucidate mechanisms governing transcriptional regulation of mouse renin genes. This proposal refines and tests a mechanistic model derived from current data which suggests that renin expression is achieved through cooperation of cell- specific and general factors binding at a crucial, proximal promoter element and distal enhancer element(s) to abrogate or override negative regulatory elements that are ubiquitously functional. Transgenic reporter assays, utilizing EGFP, indicate that all regulatory information required to correctly specify known patterns of renin spatially, temporally, and in response to physiological perturbation, are resident within 4.1 kb of the 5' flanking sequence of the mouse Ren-1c gene. Under the Specific Aims, a variety of approaches will be used to examine in detail our finding that Ren genes are immediate downstream targets of Class 1 Hox genes acting through a proximal promoter """"""""switch-like"""""""" element. Transgenic and cellular transfection assays will be used to assess whether a single complex, or multiple discrete, enhancer(s) are differentially driving expression at key sites of expression observed in vivo such as the renal vasculature and placental tissue. Cis-acting elements observed to mediate potent downregulation of renin expression in As4.1 cells in response to cytokine, hormone and mechanical distention will be mapped within the 5' flanking sequence by in vitro transient-transfection assays prior to testing involvement in vivo by transgenic analysis. Current data suggest that cis-acting elements identified as critical to mediating high level expression of renin in As4.1 cells are, in fact, utilized in vivo. Moreover, the major elements appear to be conserved evolutionarily across species, including human. Identification of the specific recognition sequences, their cognate protein partners and elucidation of the mechanism of interaction, should provide fundamental knowledge on the role of the renin-angiotensin system in normal physiology and abnormal pathophysiological states, as well as afford insight into its role in vertebrate evolution.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
3R01HL048459-10S1
Application #
6661140
Study Section
Cardiovascular and Renal Study Section (CVB)
Program Officer
Lin, Michael
Project Start
1992-05-01
Project End
2005-05-31
Budget Start
2002-06-01
Budget End
2003-05-31
Support Year
10
Fiscal Year
2002
Total Cost
$75,000
Indirect Cost
Name
Roswell Park Cancer Institute Corp
Department
Type
DUNS #
City
Buffalo
State
NY
Country
United States
Zip Code
14263
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Eng, Diana G; Kaverina, Natalya V; Schneider, Remington R S et al. (2018) Detection of renin lineage cell transdifferentiation to podocytes in the kidney glomerulus with dual lineage tracing. Kidney Int 93:1240-1246
Martini, Alexandre G; Xa, Lucie K; Lacombe, Marie-Josée et al. (2017) Transcriptome Analysis of Human Reninomas as an Approach to Understanding Juxtaglomerular Cell Biology. Hypertension 69:1145-1155
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Pippin, Jeffrey W; Glenn, Sean T; Krofft, Ronald D et al. (2014) Cells of renin lineage take on a podocyte phenotype in aging nephropathy. Am J Physiol Renal Physiol 306:F1198-209
Glenn, S T; Jones, C A; Sexton, S et al. (2014) Conditional deletion of p53 and Rb in the renin-expressing compartment of the pancreas leads to a highly penetrant metastatic pancreatic neuroendocrine carcinoma. Oncogene 33:5706-15
Pippin, Jeffrey W; Sparks, Matthew A; Glenn, Sean T et al. (2013) Cells of renin lineage are progenitors of podocytes and parietal epithelial cells in experimental glomerular disease. Am J Pathol 183:542-57
Glenn, Sean T; Jones, Craig A; Gross, Kenneth W et al. (2013) Control of renin [corrected] gene expression. Pflugers Arch 465:13-21
Mendez, Mariela; Gross, Kenneth W; Glenn, Sean T et al. (2011) Vesicle-associated membrane protein-2 (VAMP2) mediates cAMP-stimulated renin release in mouse juxtaglomerular cells. J Biol Chem 286:28608-18

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