Program Director/Principal Investigator (Last, First, Middle): Jose, PedfO A.PROJECT SUMMARY {See instructions):The Dl receptor (DIR) and DSR regulate ion transport in the renal proximal tubule, thick ascending limb,and other nephron segments. In the previous cycle, we showed that that SNX5 and SNX1 are important inthe intemalization of DIR and DSR, respectively. Moreover, selective renal deletion of SNX1 or SNXSincreases blood pressure in mice and rats. In human renal proximal tubule cells, SNXS is expressed in non-lipid rafts while DIR, GRK4, and PP2A-catalytic subunit/ PPP2R2C2, and VPS 26 are in lipid and non-lipidrafts. Dl-like receptor stimulation shifts DIR, GRK4, PP2A catalytic subunit/PPP2R2C2, and VPS 26 tonon-lipid rafts where SNXS is located. We hypothesize that the assembly of DIR with the signaling complexin membrane microdomains is govemed by SNXS. SNXS may act as a chaperone in the intracellulartrafficking of DIR after agonist stimulation. This hypothesis will be tested in human renal proximal tubulecells; mouse proximal and distal convoluted tubule celis will be studied also because the role of theseproteins on renal function and blood pressure will be tested in genetically manipulated mice.
Specific aim 1 will test the hypothesis that SNXS is important in the assembly of DIR, PP2A complex, and GRK4 in non-lipid raft membrane microdomains, as well as the intemalization of this complex after agonist stimulation andsubsequent recycling.
Specific aim 2 will test the hypothesis that Dl R is linked to adenylyl cyclase (AC) IIIand AC VI and DSR is linked to AC IV in specific membrane microdomains in renal proximal tubules. In non-renal proximal tubule cells, D1R is linked to AC V. However, AC V is not expressed in renal proximaltubules.
Specific aim 3 will test the hypothesis that PPP2R2C, SNX1, and SNXS are important in theregulation of blood pressure. These in vitro and in vivo studies may give important information on howspecificity is confened on G protein-coupled receptor action, related to second messengers, sodiumtransport, and subsequently hypertension. At least two hypotheses are novel: 1) that SNXS is important inthe assembly and signaling of DIR, PP2A, AC III and AC VI and GRK4 while DSR is linked to AC IV. Atleast two methods are novel: selective renal gene silencing in mice and inducible/reversible knockout.

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(See Instructions):The cause and mechanisms leading to essential hypertension are still not well understood.These studieshave important implication in hypertension because GRK4 gene variants are associated with hypertension;of all the genes thought to be important in hypertension, only the human GRK4 gene variants have beenshown to produce hypertension in mice. SNX1 and PP2R2C gene variants are associated with hypertensionin Caucasian AmericansPROJECT/PERFORMANCE SrrE(S) (if additional space Is needed, use

National Institute of Health (NIH)
National Heart, Lung, and Blood Institute (NHLBI)
Method to Extend Research in Time (MERIT) Award (R37)
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Special Emphasis Panel (NSS)
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OH, Youngsuk
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University of Maryland Baltimore
Internal Medicine/Medicine
Schools of Medicine
United States
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Sanada, H; Yoneda, M; Yatabe, J et al. (2016) Common variants of the G protein-coupled receptor type 4 are associated with human essential hypertension and predict the blood pressure response to angiotensin receptor blockade. Pharmacogenomics J 16:3-9
Jose, Pedro A; Felder, Robin A; Yang, Zhiwei et al. (2016) Gastrorenal Axis. Hypertension 67:1056-63
Zhang, Yanrong; Jiang, Xiaoliang; Qin, Chuan et al. (2016) Dopamine D2 receptors' effects on renal inflammation are mediated by regulation of PP2A function. Am J Physiol Renal Physiol 310:F128-34
Konkalmatt, Prasad R; Asico, Laureano D; Zhang, Yanrong et al. (2016) Renal rescue of dopamine D2 receptor function reverses renal injury and high blood pressure. JCI Insight 1:
Jose, Pedro A (2016) Gastrorenal communication: sniffing and tasting. Exp Physiol 101:457-8
Wang, Zheng; Zeng, Chunyu; Villar, Van Anthony M et al. (2016) Human GRK4γ142V Variant Promotes Angiotensin II Type I Receptor-Mediated Hypertension via Renal Histone Deacetylase Type 1 Inhibition. Hypertension 67:325-34
Jose, Pedro A; Yang, Zhiwei; Zeng, Chunyu et al. (2016) The importance of the gastrorenal axis in the control of body sodium homeostasis. Exp Physiol 101:465-70
Jose, Pedro A; Raj, Dominic (2015) Gut microbiota in hypertension. Curr Opin Nephrol Hypertens 24:403-9
Reho, John J; Zheng, Xiaoxu; Asico, Laureano D et al. (2015) Redox signaling and splicing dependent change in myosin phosphatase underlie early versus late changes in NO vasodilator reserve in a mouse LPS model of sepsis. Am J Physiol Heart Circ Physiol 308:H1039-50
Armando, Ines; Konkalmatt, Prasad; Felder, Robin A et al. (2015) The renal dopaminergic system: novel diagnostic and therapeutic approaches in hypertension and kidney disease. Transl Res 165:505-11

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