Project #4 will invesfigate the role of P450 Arachidonic Acid (AA) metabolites in regulation of both function and growth of renal epithelial cells. Studies performed by this PPG and by others indicate a role for the P450 AA monooxygenase pathway in the pathophysiology of human hypertension, in salt sensitive natriuresis and in the progression of renal disease. There is increasing evidence that both EETs and 20-HETE serve as important natriuretic factors, with direct inhibitory effects on sodium transporters in renal epithelial cells. Based on previous studies by our group and by others, we propose that EETs and 20-HETE serve primarily as intracellular second messengers for certain growth factors and hormones, regulating other signal transduction pathways and ion channels and transporters in renal epithelial cells. Specifically, we will explore their role as second messengers for Epidermal Growth Factor (EGF) and dopamine, two agonists postulated to have important roles in regulafion of renal epithelial salt and water homeostasis. In addifion to their role as second messengers to mediate functional tubule responses, we and others have documented mitogenic and anti-apoptotic effects of P450 AA metabolites in vitro, and we hypothesize that they are also important in protecfion and recovery from ischemic injury of the mammalian kidney in vivo. In order to investigate these issues, we propose the follow specific aims:
Specific Aim I) Investigate intracellular signaling mechanisms of EETs as second messengers for renal EGF receptor activation and functional responses.
Specific Aim II) Investigate the role of P450 AA metabolites as second messengers for dopamine-mediated natriuresis Specific Aim 111) Investigate the role of EETs in cytoprotection and recovery from acute tubule injury We hypothesize that sublethal renal injury may lead to increased P450 expression and function in mammalian kidney to """"""""precondition"""""""" against further ischemia/reperfusion induced injury.

Public Health Relevance

These studies will investigate potential underiying mechanisms regulating salt and water homeostasis by the kidney and will determine if the P450 arachidonic acid metabolites are mediators of net natriuresis. Given the importance of altered kidney regulafion of salt and water in the development/maintenance of hypertension, these studies may provide new insights into pathophysiology. In addifion, these studies will determine if alterations of these compounds mav underiie Dathophvsioloaic alterafions in acute kidnev iniurv.

National Institute of Health (NIH)
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Research Program Projects (P01)
Project #
Application #
Study Section
Special Emphasis Panel (ZDK1-GRB-S (M3))
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Vanderbilt University Medical Center
United States
Zip Code
Elijovich, Fernando; Milne, Ginger L; Brown, Nancy J et al. (2018) Two Pools of Epoxyeicosatrienoic Acids in Humans: Alterations in Salt-Sensitive Normotensive Subjects. Hypertension 71:346-355
Sausville, Lindsay N; Gangadhariah, Mahesha H; Chiusa, Manuel et al. (2018) The Cytochrome P450 Slow Metabolizers CYP2C9*2 and CYP2C9*3 Directly Regulate Tumorigenesis via Reduced Epoxyeicosatrienoic Acid Production. Cancer Res 78:4865-4877
Garcia, Victor; Gilani, Ankit; Shkolnik, Brian et al. (2017) 20-HETE Signals Through G-Protein-Coupled Receptor GPR75 (Gq) to Affect Vascular Function and Trigger Hypertension. Circ Res 120:1776-1788
Guo, Zhijun; Sevrioukova, Irina F; Denisov, Ilia G et al. (2017) Heme Binding Biguanides Target Cytochrome P450-Dependent Cancer Cell Mitochondria. Cell Chem Biol 24:1259-1275.e6
Zhang, Hui; Falck, John R; Roman, Richard J et al. (2017) Upregulation of 20-HETE Synthetic Cytochrome P450 Isoforms by Oxygen-Glucose Deprivation in Cortical Neurons. Cell Mol Neurobiol 37:1279-1286
Gangadhariah, Mahesha H; Dieckmann, Blake W; Lantier, Louise et al. (2017) Cytochrome P450 epoxygenase-derived epoxyeicosatrienoic acids contribute to insulin sensitivity in mice and in humans. Diabetologia 60:1066-1075
Shuey, Megan M; Billings 4th, Frederic T; Wei, Shouzou et al. (2017) Association of gain-of-function EPHX2 polymorphism Lys55Arg with acute kidney injury following cardiac surgery. PLoS One 12:e0175292
Fan, Fan; Pabbidi, Mallikarjuna R; Ge, Ying et al. (2017) Knockdown of Add3 impairs the myogenic response of renal afferent arterioles and middle cerebral arteries. Am J Physiol Renal Physiol 312:F971-F981
Sporkov√°, Alexandra; Reddy, Rami N; Falck, John R et al. (2016) Interlobular Arteries From 2-Kidney, 1-Clip Goldblatt Hypertensive Rats' Exhibit-Impaired Vasodilator Response to Epoxyeicosatrienoic Acids. Am J Med Sci 351:513-9
Miller, Bradley; Palygin, Oleg; Rufanova, Victoriya A et al. (2016) p66Shc regulates renal vascular tone in hypertension-induced nephropathy. J Clin Invest 126:2533-46

Showing the most recent 10 out of 376 publications