The renin-angiotensin system (RAS) is a major regulator of blood pressure and electrolyte balance in animals and humans. Renin is the rate limiting enzyme of the RAS cascade and its synthesis is highly regulated at both the transcriptional, post-transcriptional and secretory level. Despite years of investigation, our understanding of the mechanisms regulating renin gene expression remained very incomplete. The purpose of this proposal therefore is to test the overall hypothesis that the enhancers found upstream of the renin gene along with their cognate transcription factors (and specific ligands), co-activators, and co-repressors play a major role in controlling the cell- and tissue-specificity of expression and the transcriptional responses to physiological cues. To test and expand upon this hypothesis we have developed the following three main specific aims: 1) test the hypothesis that individual transcription factors identified to bind to the renin enhancer are important modulators of renin promoter/enhancer activity and endogenous renin expression at baseline, and under conditions where renin expression is either stimulated or repressed, 2) test the hypothesis that two enhancers of transcription, the kidney enhancer (KE) and chorionic enhancer (CE) in the human renin 5' flanking region are essential elements controlling tissue- and cell-specific expression and the responses to physiological cues, and 3) test the hypothesis that the transcription factors Ear2 (a negative regulator) and RARa (a positive regulator) are major determinants of renin expression in whole animals. With the development of new innovative technologies for interrogation of individual genes and proteins in both cells and whole animals, we are now poised for the first time to make important discoveries linking transcriptional events to specific physiological responses and pathways. ? ? ?
| Shinohara, Keisuke; Liu, Xuebo; Morgan, Donald A et al. (2016) Selective Deletion of the Brain-Specific Isoform of Renin Causes Neurogenic Hypertension. Hypertension 68:1385-1392 |
| Ketsawatsomkron, Pimonrat; Keen, Henry L; Davis, Deborah R et al. (2016) Protective Role for Tissue Inhibitor of Metalloproteinase-4, a Novel Peroxisome Proliferator-Activated Receptor-? Target Gene, in Smooth Muscle in Deoxycorticosterone Acetate-Salt Hypertension. Hypertension 67:214-22 |
| Hu, Chunyan; Lu, Ko-Ting; Mukohda, Masashi et al. (2016) Interference with PPAR? in endothelium accelerates angiotensin II-induced endothelial dysfunction. Physiol Genomics 48:124-34 |
| Lu, Ko-Ting; Keen, Henry L; Weatherford, Eric T et al. (2016) Estrogen Receptor ? Is Required for Maintaining Baseline Renin Expression. Hypertension 67:992-9 |
| Littlejohn, Nicole K; Keen, Henry L; Weidemann, Benjamin J et al. (2016) Suppression of Resting Metabolism by the Angiotensin AT2 Receptor. Cell Rep 16:1548-1560 |
| Mukohda, Masashi; Stump, Madeliene; Ketsawatsomkron, Pimonrat et al. (2016) Endothelial PPAR-? provides vascular protection from IL-1?-induced oxidative stress. Am J Physiol Heart Circ Physiol 310:H39-48 |
| Wu, Jing; Sigmund, Curt D (2016) Hypertension: A Disease That Strikes Around the Clock. Hypertension 67:493-5 |
| Sequeira-Lopez, Maria Luisa S; Nagalakshmi, Vidya K; Li, Minghong et al. (2015) Vascular versus tubular renin: role in kidney development. Am J Physiol Regul Integr Comp Physiol 309:R650-7 |
| Ketsawatsomkron, Pimonrat; Sigmund, Curt D (2015) Molecular mechanisms regulating vascular tone by peroxisome proliferator activated receptor gamma. Curr Opin Nephrol Hypertens 24:123-30 |
| Santillan, Mark K; Pelham, Christopher J; Ketsawatsomkron, Pimonrat et al. (2015) Pregnant mice lacking indoleamine 2,3-dioxygenase exhibit preeclampsia phenotypes. Physiol Rep 3: |
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