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Gironacci MM, Bruna-Haupt E. Unraveling the crosstalk between renin-angiotensin system receptors. Acta Physiol (Oxf) 2024; 240:e14134. [PMID: 38488216 DOI: 10.1111/apha.14134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/23/2024] [Accepted: 03/05/2024] [Indexed: 04/24/2024]
Abstract
The renin-angiotensin system (RAS) plays a key role in blood pressure regulation. The RAS is a complex interconnected system composed of two axes with opposite effects. The pressor arm, represented by angiotensin (Ang) II and the AT1 receptor (AT1R), mediates the vasoconstrictor, proliferative, hypertensive, oxidative, and pro-inflammatory effects of the RAS, while the depressor/protective arm, represented by Ang-(1-7), its Mas receptor (MasR) and the AT2 receptor (AT2R), opposes the actions elicited by the pressor arm. The AT1R, AT2R, and MasR belong to the G-protein-coupled receptor (GPCR) family. GPCRs operate not only as monomers, but they can also function in dimeric (homo and hetero) or higher-order oligomeric states. Due to the interaction with other receptors, GPCR properties may change: receptor affinity, trafficking, signaling, and its biological function may be altered. Thus, heteromerization provides a newly recognized means of modulation of receptor function, as well as crosstalk between GPCRs. This review is focused on angiotensin receptors, and how their properties are influenced by crosstalk with other receptors, adding more complexity to an already complex system and potentially opening up new therapeutic approaches.
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Affiliation(s)
- Mariela M Gironacci
- Facultad de Farmacia y Bioquímica, IQUIFIB (UBA-CONICET), Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ezequiel Bruna-Haupt
- INTEQUI (CONICET), Departamento de Química, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, San Luis, Argentina
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Amatya B, Yang S, Yu P, Vaz de Castro PA, Armando I, Zeng C, Felder RA, Asico LD, Jose PA, Lee H. Peroxiredoxin-4 and Dopamine D5 Receptor Interact to Reduce Oxidative Stress and Inflammation in the Kidney. Antioxid Redox Signal 2023; 38:1150-1166. [PMID: 36401517 PMCID: PMC10262345 DOI: 10.1089/ars.2022.0034] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 11/05/2022] [Accepted: 11/05/2022] [Indexed: 11/21/2022]
Abstract
Aims: Reactive oxygen species are highly reactive molecules generated in different subcellular compartments. Both the dopamine D5 receptor (D5R) and endoplasmic reticulum (ER)-resident peroxiredoxin-4 (PRDX4) play protective roles against oxidative stress. This study is aimed at investigating the interaction between PRDX4 and D5R in regulating oxidative stress in the kidney. Results: Fenoldopam (FEN), a D1R and D5R agonist, increased PRDX4 protein expression, mainly in non-lipid rafts, in D5R-HEK 293 cells. FEN increased the co-immunoprecipitation of D5R and PRDX4 and their colocalization, particularly in the ER. The efficiency of Förster resonance energy transfer was increased with FEN treatment measured with fluorescence lifetime imaging microscopy. Silencing of PRDX4 increased hydrogen peroxide production, impaired the inhibitory effect of FEN on hydrogen peroxide production, and increased the production of interleukin-1β, tumor necrosis factor (TNF), and caspase-12 in renal cells. Furthermore, in Drd5-/- mice, which are in a state of oxidative stress, renal cortical PRDX4 was decreased whereas interleukin-1β, TNF, and caspase-12 were increased, relative to their normotensive wild-type Drd5+/+ littermates. Innovation: Our findings demonstrate a novel relationship between D5R and PRDX4 and the consequent effects of this relationship in attenuating hydrogen peroxide production in the ER and the production of proinflammatory cytokines. This study provides the potential for the development of biomarkers and new therapeutics for renal inflammatory disorders, including hypertension. Conclusion: PRDX4 interacts with D5R to decrease oxidative stress and inflammation in renal cells that may have the potential for translational significance. Antioxid. Redox Signal. 38, 1150-1166.
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Affiliation(s)
- Bibhas Amatya
- Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
| | - Sufei Yang
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
| | - Peiying Yu
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Center for Molecular Physiology Research, Children's National Medical Center, Washington, District of Columbia, USA
| | - Pedro A.S. Vaz de Castro
- Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
| | - Ines Armando
- Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Center for Molecular Physiology Research, Children's National Medical Center, Washington, District of Columbia, USA
| | - Chunyu Zeng
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
| | - Robin A. Felder
- Department of Pathology, University of Virginia Health Sciences Center, Charlottesville, Virginia, USA
| | - Laureano D. Asico
- Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Center for Molecular Physiology Research, Children's National Medical Center, Washington, District of Columbia, USA
| | - Pedro A. Jose
- Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Center for Molecular Physiology Research, Children's National Medical Center, Washington, District of Columbia, USA
- Department of Pharmacology/Physiology, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
| | - Hewang Lee
- Department of Medicine, The George Washington University School of Medicine & Health Sciences, Washington, District of Columbia, USA
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Center for Molecular Physiology Research, Children's National Medical Center, Washington, District of Columbia, USA
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Huang J, Tiu AC, Jose PA, Yang J. Sorting nexins: role in the regulation of blood pressure. FEBS J 2023; 290:600-619. [PMID: 34847291 PMCID: PMC9149145 DOI: 10.1111/febs.16305] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 10/13/2021] [Accepted: 11/29/2021] [Indexed: 02/06/2023]
Abstract
Sorting nexins (SNXs) are a family of proteins that regulate cellular cargo sorting and trafficking, maintain intracellular protein homeostasis, and participate in intracellular signaling. SNXs are also important in the regulation of blood pressure via several mechanisms. Aberrant expression and dysfunction of SNXs participate in the dysregulation of blood pressure. Genetic studies show a correlation between SNX gene variants and the response to antihypertensive drugs. In this review, we summarize the progress in SNX-mediated regulation of blood pressure, discuss the potential role of SNXs in the pathophysiology and treatment of hypertension, and propose novel strategies for the medical therapy of hypertension.
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Affiliation(s)
- Juan Huang
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing 410020, P.R. China
| | - Andrew C. Tiu
- Department of Medicine, Einstein Medical Center Philadelphia, Philadelphia, PA 19141, USA
| | - Pedro A. Jose
- Division of Renal Diseases & Hypertension, Department of Medicine, and Department of Physiology and Pharmacology, The George Washington University School of Medicine & Health Sciences, Washington, DC 20052, USA
| | - Jian Yang
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing 410020, P.R. China
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Interactions between the intrarenal dopaminergic and the renin-angiotensin systems in the control of systemic arterial pressure. Clin Sci (Lond) 2022; 136:1205-1227. [PMID: 35979889 DOI: 10.1042/cs20220338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 07/31/2022] [Accepted: 08/03/2022] [Indexed: 11/17/2022]
Abstract
Systemic arterial hypertension is one of the leading causes of morbidity and mortality in the general population, being a risk factor for many cardiovascular diseases. Although its pathogenesis is complex and still poorly understood, some systems appear to play major roles in its development. This review aims to update the current knowledge on the interaction of the intrarenal renin-angiotensin system (RAS) and dopaminergic system in the development of hypertension, focusing on recent scientific hallmarks in the field. The intrarenal RAS, composed of several peptides and receptors, has a critical role in the regulation of blood pressure (BP) and, consequently, the development of hypertension. The RAS is divided into two main intercommunicating axes: the classical axis, composed of angiotensin-converting enzyme, angiotensin II, and angiotensin type 1 receptor, and the ACE2/angiotensin-(1-7)/Mas axis, which appears to modulate the effects of the classical axis. Dopamine and its receptors are also increasingly showing an important role in the pathogenesis of hypertension, as abnormalities in the intrarenal dopaminergic system impair the regulation of renal sodium transport, regardless of the affected dopamine receptor subtype. There are five dopamine receptors, which are divided into two major subtypes: the D1-like (D1R and D5R) and D2-like (D2R, D3R, and D4R) receptors. Mice deficient in any of the five dopamine receptor subtypes have increased BP. Intrarenal RAS and the dopaminergic system have complex interactions. The balance between both systems is essential to regulate the BP homeostasis, as alterations in the control of both can lead to hypertension.
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Inverse Salt Sensitivity of Blood Pressure: Mechanisms and Potential Relevance for Prevention of Cardiovascular Disease. Curr Hypertens Rep 2022; 24:361-374. [PMID: 35708819 DOI: 10.1007/s11906-022-01201-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/07/2022] [Indexed: 11/03/2022]
Abstract
PURPOSE OF REVIEW To review the etiology of inverse salt sensitivity of blood pressure (BP). RECENT FINDINGS Both high and low sodium (Na+) intake can be associated with increased BP and cardiovascular morbidity and mortality. However, little is known regarding the mechanisms involved in the increase in BP in response to low Na+ intake, a condition termed inverse salt sensitivity of BP, which affects approximately 15% of the adult population. The renal proximal tubule is important in regulating up to 70% of renal Na+ transport. The renin-angiotensin and renal dopaminergic systems play both synergistic and opposing roles in the regulation of Na+ transport in this nephron segment. Clinical studies have demonstrated that individuals express a "personal salt index" (PSI) that marks whether they are salt-resistant, salt-sensitive, or inverse salt-sensitive. Inverse salt sensitivity results in part from genetic polymorphisms in various Na+ regulatory genes leading to a decrease in natriuretic activity and an increase in renal tubular Na+ reabsorption leading to an increase in BP. This article reviews the potential mechanisms of a new pathophysiologic entity, inverse salt sensitivity of BP, which affects approximately 15% of the general adult population.
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Liu C, Li X, Fu J, Chen K, Liao Q, Wang J, Chen C, Luo H, Jose PA, Yang Y, Yang J, Zeng C. Increased AT 1 receptor expression mediates vasoconstriction leading to hypertension in Snx1 -/- mice. Hypertens Res 2021; 44:906-917. [PMID: 33972750 PMCID: PMC8590203 DOI: 10.1038/s41440-021-00661-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Revised: 02/18/2021] [Accepted: 03/17/2021] [Indexed: 02/03/2023]
Abstract
Angiotensin II type 1 receptor (AT1R) is a vital therapeutic target for hypertension. Sorting nexin 1 (SNX1) participates in the sorting and trafficking of the renal dopamine D5 receptor, while angiotensin and dopamine are counterregulatory factors in the regulation of blood pressure. The effect of SNX1 on AT1R is not known. We hypothesized that SNX1, through arterial AT1R sorting and trafficking, is involved in blood pressure regulation. CRISPR/Cas9 system-generated SNX1-/- mice showed dramatic elevations in blood pressure compared to their wild-type littermates. The angiotensin II-mediated contractile reactivity of the mesenteric arteries and AT1R expression in the aortas were also increased. Moreover, immunofluorescence and immunoprecipitation analyses revealed that SNX1 and AT1R were colocalized and interacted in the aortas of wild-type mice. In vitro studies revealed that AT1R protein levels and downstream calcium signaling were upregulated in A10 cells treated with SNX1 siRNA. This may have resulted from decreased AT1R protein degradation since the AT1R mRNA levels showed no changes. AT1R protein was less degraded when SNX1 was downregulated, as reflected by a cycloheximide chase assay. Furthermore, proteasomal rather than lysosomal inhibition increased AT1R protein content, and this effect was accompanied by decayed binding of ubiquitin and AT1R after SNX1 knockdown. Confocal microscopy revealed that AT1R colocalized with PSMD6, a proteasomal marker, and the colocalization was reduced after SNX1 knockdown. These findings suggest that SNX1 sorts AT1R for proteasomal degradation and that SNX1 impairment increases arterial AT1R expression, leading to increased vasoconstriction and blood pressure.
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Affiliation(s)
- Chao Liu
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Xingyue Li
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- College of Medicine, Southwest Jiaotong University, Chengdu, Sichuan, China
- Department of Cardiovascular Medicine, The General Hospital of Western Theater Command PLA, Chengdu, Sichuan, China
| | - Jinjuan Fu
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
| | - Ken Chen
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
| | - Qiao Liao
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
| | - Jialiang Wang
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
| | - Caiyu Chen
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
| | - Hao Luo
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China
| | - Pedro A Jose
- Division of Renal Disease & Hypertension, The George Washington University School of Medicine and Health Sciences, Washington, DC, USA
| | - Yongjian Yang
- College of Medicine, Southwest Jiaotong University, Chengdu, Sichuan, China.
- Department of Cardiovascular Medicine, The General Hospital of Western Theater Command PLA, Chengdu, Sichuan, China.
| | - Jian Yang
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, China.
| | - Chunyu Zeng
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, China.
- Chongqing Institute of Cardiology & Chongqing Key Laboratory of Hypertension Research, Chongqing, China.
- State Key Laboratory of Trauma, Burns and Combined Injury, Daping Hospital, The Third Military Medical University, Chongqing, China.
- Cardiovascular Research Center of Chongqing College, Department of Cardiology of Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, China.
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Lee H, Jiang X, Perwaiz I, Yu P, Wang J, Wang Y, Hüttemann M, Felder RA, Sibley DR, Polster BM, Rozyyev S, Armando I, Yang Z, Qu P, Jose PA. Dopamine D 5 receptor-mediated decreases in mitochondrial reactive oxygen species production are cAMP and autophagy dependent. Hypertens Res 2021; 44:628-641. [PMID: 33820956 PMCID: PMC8369611 DOI: 10.1038/s41440-021-00646-w] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Revised: 11/10/2019] [Accepted: 12/03/2019] [Indexed: 01/31/2023]
Abstract
Overproduction of reactive oxygen species (ROS) plays an important role in the pathogenesis of hypertension. The dopamine D5 receptor (D5R) is known to decrease ROS production, but the mechanism is not completely understood. In HEK293 cells overexpressing D5R, fenoldopam, an agonist of the two D1-like receptors, D1R and D5R, decreased the production of mitochondria-derived ROS (mito-ROS). The fenoldopam-mediated decrease in mito-ROS production was mimicked by Sp-cAMPS but blocked by Rp-cAMPS. In human renal proximal tubule cells with DRD1 gene silencing to eliminate the confounding effect of D1R, fenoldopam still decreased mito-ROS production. By contrast, Sch23390, a D1R and D5R antagonist, increased mito-ROS production in the absence of D1R, D5R is constitutively active. The fenoldopam-mediated inhibition of mito-ROS production may have been related to autophagy because fenoldopam increased the expression of the autophagy hallmark proteins, autophagy protein 5 (ATG5), and the microtubule-associated protein 1 light chain (LC)3-II. In the presence of chloroquine or spautin-1, inhibitors of autophagy, fenoldopam further increased ATG5 and LC3-II expression, indicating an important role of D5R in the positive regulation of autophagy. However, when autophagy was inhibited, fenoldopam was unable to inhibit ROS production. Indeed, the levels of these autophagy hallmark proteins were decreased in the kidney cortices of Drd5-/- mice. Moreover, ROS production was increased in mitochondria isolated from the kidney cortices of Drd5-/- mice, relative to Drd5+/+ littermates. In conclusion, D5R-mediated activation of autophagy plays a role in the D5R-mediated inhibition of mito-ROS production in the kidneys.
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Affiliation(s)
- Hewang Lee
- Department of Medicine, School of Medicine & Health Sciences, George Washington University, Washington, DC, USA,Institute of Heart and Vessel Diseases, Affiliated Second Hospital, Dalian Medical University, Dalian, China,Division of Nephrology, Department of Medicine, School of Medicine, University of Maryland, Baltimore, MD, USA,Center for Molecular Physiology Research, Children’s Research Institute, Children’s National Medical Center, Washington, DC, USA,Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA,Kidney Disease Section, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD, USA
| | - Xiaoliang Jiang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Comparative Medicine Center, Peking Union Medical College, Beijing, China
| | - Imran Perwaiz
- Institute of Heart and Vessel Diseases, Affiliated Second Hospital, Dalian Medical University, Dalian, China
| | - Peiying Yu
- Division of Nephrology, Department of Medicine, School of Medicine, University of Maryland, Baltimore, MD, USA,Center for Molecular Physiology Research, Children’s Research Institute, Children’s National Medical Center, Washington, DC, USA,Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA
| | - Jin Wang
- Institute of Heart and Vessel Diseases, Affiliated Second Hospital, Dalian Medical University, Dalian, China
| | - Ying Wang
- Institute of Heart and Vessel Diseases, Affiliated Second Hospital, Dalian Medical University, Dalian, China
| | - Maik Hüttemann
- Center for Molecular Medicine and Genetics and Cardiovascular Research Institute, School of Medicine, Wayne State University, Detroit, MI, USA
| | - Robin A. Felder
- Department of Pathology, University of Virginia Health Sciences Center, Charlottesville, VA, USA
| | - David R. Sibley
- Molecular Neuropharmacology Section, National Institute of Neurological Disorders and Stroke, Bethesda, MD, USA
| | - Brian M. Polster
- Department of Anesthesiology, School of Medicine, University of Maryland, Baltimore, MD, USA
| | - Selim Rozyyev
- Department of Medicine, School of Medicine & Health Sciences, George Washington University, Washington, DC, USA
| | - Ines Armando
- Department of Medicine, School of Medicine & Health Sciences, George Washington University, Washington, DC, USA,Division of Nephrology, Department of Medicine, School of Medicine, University of Maryland, Baltimore, MD, USA,Center for Molecular Physiology Research, Children’s Research Institute, Children’s National Medical Center, Washington, DC, USA,Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA
| | - Zhiwei Yang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences & Comparative Medicine Center, Peking Union Medical College, Beijing, China
| | - Peng Qu
- Institute of Heart and Vessel Diseases, Affiliated Second Hospital, Dalian Medical University, Dalian, China
| | - Pedro A. Jose
- Department of Medicine, School of Medicine & Health Sciences, George Washington University, Washington, DC, USA,Division of Nephrology, Department of Medicine, School of Medicine, University of Maryland, Baltimore, MD, USA,Center for Molecular Physiology Research, Children’s Research Institute, Children’s National Medical Center, Washington, DC, USA,Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA,Department of Pharmacology and Physiology, School of Medicine & Health Sciences, George Washington University, Washington, DC, USA
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Yang J, Villar VAM, Jose PA, Zeng C. Renal Dopamine Receptors and Oxidative Stress: Role in Hypertension. Antioxid Redox Signal 2021; 34:716-735. [PMID: 32349533 PMCID: PMC7910420 DOI: 10.1089/ars.2020.8106] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Significance: The kidney plays an important role in the long-term control of blood pressure. Oxidative stress is one of the fundamental mechanisms responsible for the development of hypertension. Dopamine, via five subtypes of receptors, plays an important role in the control of blood pressure by various mechanisms, including the inhibition of oxidative stress. Recent Advances: Dopamine receptors exert their regulatory function to decrease the oxidative stress in the kidney and ultimately maintain normal sodium balance and blood pressure homeostasis. An aberration of this regulation may be involved in the pathogenesis of hypertension. Critical Issues: Our present article reviews the important role of oxidative stress and intrarenal dopaminergic system in the regulation of blood pressure, summarizes the current knowledge on renal dopamine receptor-mediated antioxidation, including decreasing reactive oxygen species production, inhibiting pro-oxidant enzyme nicotinamide-adenine dinucleotide phosphate (NADPH) oxidase, and stimulating antioxidative enzymes, and also discusses its underlying mechanisms, including the increased activity of G protein-coupled receptor kinase 4 (GRK4) and abnormal trafficking of renal dopamine receptors in hypertensive status. Future Directions: Identifying the mechanisms of renal dopamine receptors in the regulation of oxidative stress and their contribution to the pathogenesis of hypertension remains an important research focus. Increased understanding of the role of reciprocal regulation between renal dopamine receptors and oxidative stress in the regulation of blood pressure may give us novel insights into the pathogenesis of hypertension and provide a new treatment strategy for hypertension.
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Affiliation(s)
- Jian Yang
- Department of Clinical Nutrition, The Third Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Van Anthony M Villar
- Division of Renal Diseases & Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, USA
| | - Pedro A Jose
- Division of Renal Diseases & Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, USA
| | - Chunyu Zeng
- Department of Cardiology, Fujian Heart Medical Center, Fujian Medical University Union Hospital, Fuzhou, People's Republic of China.,Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China
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9
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The effects of proteasome on baseline and methamphetamine-dependent dopamine transmission. Neurosci Biobehav Rev 2019; 102:308-317. [DOI: 10.1016/j.neubiorev.2019.05.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2018] [Revised: 04/29/2019] [Accepted: 05/09/2019] [Indexed: 12/16/2022]
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10
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Wang S, Tan X, Chen P, Zheng S, Ren H, Cai J, Zhou L, Jose PA, Yang J, Zeng C. Role of Thioredoxin 1 in Impaired Renal Sodium Excretion of hD 5 R F173L Transgenic Mice. J Am Heart Assoc 2019; 8:e012192. [PMID: 30957627 PMCID: PMC6507211 DOI: 10.1161/jaha.119.012192] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Accepted: 03/12/2019] [Indexed: 12/12/2022]
Abstract
Background Dopamine D5 receptor (D5R) plays an important role in the maintenance of blood pressure by regulating renal sodium transport. Our previous study found that human D5R mutant F173L transgenic ( hD 5 R F173L-TG) mice are hypertensive. In the present study, we aimed to investigate the mechanisms causing this renal D5R dysfunction in hD 5 R F173L-TG mice. Methods and Results Compared with wild-type D5R-TG ( hD 5 R WT-TG) mice, hD 5 R F173L-TG mice have higher blood pressure, lower basal urine flow and sodium excretion, and impaired agonist-mediated natriuresis and diuresis. Enhanced reactive oxygen species production in hD 5 R F173L-TG mice is caused, in part, by decreased expression of antioxidant enzymes, including thioredoxin 1 (Trx1). Na+-K+-ATPase activity is increased in mouse renal proximal tubule cells transfected with hD 5 R F173L, but is normalized by treatment with exogenous recombinant human Trx1 protein. Regulation of Trx1 by D5R occurs by the phospholipase C/ protein kinase C (PKC) pathway because upregulation of Trx1 expression by D5R does not occur in renal proximal tubule cells from D1R knockout mice in the presence of a phospholipase C or PKC inhibitor. Fenoldopam, a D1R and D5R agonist, stimulates PKC activity in primary renal proximal tubule cells of hD5R WT -TG mice, but not in those of hD 5 R F173L-TG mice. Hyperphosphorylation of hD5RF173L and its dissociation from Gαs and Gαq are associated with impairment of D5R-mediated inhibition of Na+-K+-ATPase activity in hD 5 R F173L-TG mice. Conclusions These suggest that hD 5 R F173L increases blood pressure, in part, by decreasing renal Trx1 expression and increasing reactive oxygen species production. Hyperphosphorylation of hD5RF173L, with its dissociation from Gαs and Gαq, is the key factor in impaired D5R function of hD 5 R F173L-TG mice.
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Affiliation(s)
- Shaoxiong Wang
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Xiaorong Tan
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Peng Chen
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Shuo Zheng
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Hongmei Ren
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Jin Cai
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Lin Zhou
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
| | - Pedro A. Jose
- Division of Renal Disease & HypertensionDepartments of Medicine and Pharmacology/PhysiologyThe George Washington University School of Medicine and Health SciencesWashingtonDC
| | - Jian Yang
- Department of Clinical NutritionThe Third Affiliated Hospital of Chongqing Medical UniversityChongqingP.R. China
| | - Chunyu Zeng
- Department of CardiologyDaping HospitalArmy Medical University of PLAChongqingP.R. China
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Liu Y, Shen HJ, Wang XQY, Liu HQ, Zheng LY, Luo JD. EndophilinA2 protects against angiotensin II-induced cardiac hypertrophy by inhibiting angiotensin II type 1 receptor trafficking in neonatal rat cardiomyocytes. J Cell Biochem 2018; 119:8290-8303. [PMID: 29923351 DOI: 10.1002/jcb.26862] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 03/13/2018] [Indexed: 01/12/2023]
Abstract
Cardiac hypertrophy is one of the major risk factors for chronic heart failure. The role of endophilinA2 (EndoA2) in clathrin-mediated endocytosis and clathrin-independent endocytosis is well documented. In the present study, we tested the hypothesis that EndoA2 protects against angiotensin II (Ang II)-induced cardiac hypertrophy by mediating intracellular angiotensin II type 1 receptor (AT1-R) trafficking in neonatal rat cardiomyocytes (NRCMs). Cardiac hypertrophy was evaluated by using cell surface area and quantitative RT-PCR (qPCR) analyses. For the first time, we found that EndoA2 attenuated cardiac hypertrophy and fibrosis induced by Ang II. Moreover, EndoA2 inhibited apoptosis induced by excessive endoplasmic reticulum stress (ERS), which accounted for the beneficial effects of EndoA2 on cardiac hypertrophy. We further revealed that there was an interaction between EndoA2 and AT1-R.The expression levels of EndoA2, which inhibits AT1-R transport from the cytoplasm to the membrane, and the interaction between EndoA2 and AT1-R were obviously decreased after Ang II treatment. Furthermore, Ang II inhibited the co-localization of AT1-R with GRP-78, which was reversed by EndoA2 overexpression. In conclusion, our results suggested that EndoA2 plays a role in protecting against cardiac hypertrophy induced by Ang II, possibly by inhibiting AT1-R transport from the cytoplasm to the membrane to suppress signal transduction.
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Affiliation(s)
- Yun Liu
- Department of Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, P.R. China.,Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, and the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, P.R. China
| | - Huan-Jia Shen
- Department of Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, P.R. China
| | - Xin-Qiu-Yue Wang
- Department of Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, P.R. China
| | - Hai-Qi Liu
- Department of Pharmacology, School of Pharmaceutical Sciences and the Fifth Affiliated Hospital, Guangzhou Medical University, Guangzhou, P.R. China
| | - Ling-Yun Zheng
- School of Basic Course, Guangdong Pharmaceutical University, Guangzhou, P.R. China
| | - Jian-Dong Luo
- Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, and the Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, P.R. China
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12
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Gildea JJ, Xu P, Kemp BA, Carlson JM, Tran HT, Bigler Wang D, Langouët-Astrié CJ, McGrath HE, Carey RM, Jose PA, Felder RA. Sodium bicarbonate cotransporter NBCe2 gene variants increase sodium and bicarbonate transport in human renal proximal tubule cells. PLoS One 2018; 13:e0189464. [PMID: 29642240 PMCID: PMC5895442 DOI: 10.1371/journal.pone.0189464] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2016] [Accepted: 11/28/2017] [Indexed: 01/11/2023] Open
Abstract
RATIONALE Salt sensitivity of blood pressure affects >30% of the hypertensive and >15% of the normotensive population. Variants of the electrogenic sodium bicarbonate cotransporter NBCe2 gene, SLC4A5, are associated with increased blood pressure in several ethnic groups. SLC4A5 variants are also highly associated with salt sensitivity, independent of hypertension. However, little is known about how NBCe2 contributes to salt sensitivity, although NBCe2 regulates renal tubular sodium bicarbonate transport. We hypothesized that SLC4A5 rs10177833 and rs7571842 increase NBCe2 expression and human renal proximal tubule cell (hRPTC) sodium transport and may be a cause of salt sensitivity of blood pressure. OBJECTIVE To characterize the hRPTC ion transport of wild-type (WT) and homozygous variants (HV) of SLC4A5. METHODS AND RESULTS The expressions of NBCe2 mRNA and protein were not different between hRPTCs carrying WT or HV SLC4A5 before or after dopaminergic or angiotensin (II and III) stimulation. However, luminal to basolateral sodium transport, NHE3 protein, and Cl-/HCO3- exchanger activity in hRPTCs were higher in HV than WT SLC4A5. Increasing intracellular sodium enhanced the apical location of NBCe2 in HV hRPTCs (4.24±0.35% to 11.06±1.72% (P<0.05, N = 3, 2-way ANOVA, Holm-Sidak test)) as determined by Total Internal Reflection Fluorescence Microscopy (TIRFM). In hRPTCs isolated from kidney tissue, increasing intracellular sodium enhanced bicarbonate-dependent pH recovery rate and increased NBCe2 mRNA and protein expressions to a greater extent in HV than WT SLC4A5 (+38.00±6.23% vs HV normal salt (P<0.01, N = 4, 2-way ANOVA, Holm-Sidak test)). In hRPTCs isolated from freshly voided urine, bicarbonate-dependent pH recovery was also faster in those from salt-sensitive and carriers of HV SLC4A5 than from salt-resistant and carriers of WT SLC4A5. The faster NBCe2-specific bicarbonate-dependent pH recovery rate in HV SCL4A5 was normalized by SLC4A5- but not SLC4A4-shRNA. The binding of purified hepatocyte nuclear factor type 4A (HNF4A) to DNA was increased in hRPTCs carrying HV SLC4A5 rs7571842 but not rs10177833. The faster NBCe2-specific bicarbonate-dependent pH recovery rate in HV SCL4A5 was abolished by HNF4A antagonists. CONCLUSION NBCe2 activity is stimulated by an increase in intracellular sodium and is hyper-responsive in hRPTCs carrying HV SLC4A5 rs7571842 through an aberrant HNF4A-mediated mechanism.
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Affiliation(s)
- John J. Gildea
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
| | - Peng Xu
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
| | - Brandon A. Kemp
- The University of Virginia Department of Medicine, Charlottesville, VA, United States of America
| | - Julia M. Carlson
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
| | - Hanh T. Tran
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
| | - Dora Bigler Wang
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
| | | | - Helen E. McGrath
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
| | - Robert M. Carey
- The University of Virginia Department of Medicine, Charlottesville, VA, United States of America
| | - Pedro A. Jose
- The George Washington University School of Medicine & Health Sciences, Department of Medicine, Division of Renal Disease and Hypertension and Department of Pharmacology and Physiology, Washington, DC, United States of America
| | - Robin A. Felder
- The University of Virginia Department of Pathology, Charlottesville, VA, United States of America
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13
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Isobe-Sasaki Y, Fukuda M, Ogiyama Y, Sato R, Miura T, Fuwa D, Mizuno M, Matsuoka T, Shibata H, Ito H, Ono M, Abe-Dohmae S, Kiyono K, Yamamoto Y, Kobori H, Michikawa M, Hayano J, Ohte N. Sodium balance, circadian BP rhythm, heart rate variability, and intrarenal renin-angiotensin-aldosterone and dopaminergic systems in acute phase of ARB therapy. Physiol Rep 2018; 5:5/11/e13309. [PMID: 28576855 PMCID: PMC5471446 DOI: 10.14814/phy2.13309] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 04/29/2017] [Accepted: 05/10/2017] [Indexed: 01/11/2023] Open
Abstract
We have revealed that even in humans, activated intrarenal renin–angiotensin–aldosterone system (RAAS) enhances tubular sodium reabsorption to facilitate salt sensitivity and nondipper rhythm of blood pressure (BP), and that angiotensin receptor blocker (ARB) could increase daytime urinary sodium excretion rate (UNaV) to produce lower sodium balance and restore nondipper rhythm. However, the sympathetic nervous system and intrarenal dopaminergic system can also contribute to renal sodium handling. A total of 20 patients with chronic kidney disease (61 ± 15 years) underwent 24‐h ambulatory BP monitoring before and during two‐day treatment with ARB, azilsartan. Urinary angiotensinogen excretion rate (UAGTV, μg/gCre) was measured as intrarenal RAAS; urinary dopamine excretion rate (UDAV, pg/gCre) as intrarenal dopaminergic system; heart rate variabilities (HRV, calculated from 24‐h Holter‐ECG) of non‐Gaussianity index λ25s as sympathetic nerve activity; and power of high‐frequency (HF) component or deceleration capacity (DC) as parasympathetic nerve activity. At baseline, glomerular filtration rate correlated inversely with UAGTV (r = −0.47, P = 0.04) and positively with UDAV (r = 0.58, P = 0.009). HF was a determinant of night/day BP ratio (β = −0.50, F = 5.8), rather than DC or λ25s. During the acute phase of ARB treatment, a lower steady sodium balance was not achieved. Increase in daytime UNaV preceded restoration of BP rhythm, accompanied by decreased UAGTV (r = −0.88, P = 0.05) and increased UDAV (r = 0.87, P = 0.05), but with no changes in HRVs. Diminished sodium excretion can cause nondipper BP rhythm. This was attributable to intrarenal RAAS and dopaminergic system and impaired parasympathetic nerve activity. During the acute phase of ARB treatment, cooperative effects of ARB and intrarenal dopaminergic system exert natriuresis to restore circadian BP rhythm.
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Affiliation(s)
- Yukako Isobe-Sasaki
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Michio Fukuda
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Yoshiaki Ogiyama
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Ryo Sato
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Toshiyuki Miura
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Daisuke Fuwa
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Masashi Mizuno
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Tetsuhei Matsuoka
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hiroko Shibata
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Hiroyuki Ito
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Minamo Ono
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Sumiko Abe-Dohmae
- Department of Biochemistry, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Ken Kiyono
- Department of Mechanical Science and Bioengineering, Osaka University, Osaka, Japan
| | - Yoshiharu Yamamoto
- Department of Physical and Health Education, University of Tokyo Graduate School of Education, Tokyo, Japan
| | - Hiroyuki Kobori
- International University of Health and Welfare, Tokyo, Japan
| | - Makoto Michikawa
- Department of Biochemistry, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Junichiro Hayano
- Department of Medical Education, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
| | - Nobuyuki Ohte
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan
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14
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Abstract
The kidney is a highly integrated system of specialized differentiated cells that are responsible for fluid and electrolyte balance in the body. While much of today's research focuses on isolated nephron segments or cells from nephron segments grown in tissue culture, an often overlooked technique that can provide a unique view of many cell types in the kidney is slice culture. Here, we describe techniques that use freshly excised kidney tissue from rats to perform a variety of experiments shortly after isolating the tissue. By slicing the rat kidney in a "bread loaf" format, multiple studies can be performed on slices from the same tissue in parallel. Cryosectioning and staining of the tissue allow for the evaluation of physiological or biochemical responses in a wide variety of specific nephron segments. The procedures described within this chapter can also be extended to human or mouse kidney tissue.
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15
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Tang L, Zheng S, Ren H, He D, Zeng C, Wang WE. Activation of angiotensin II type 1 receptors increases D 4 dopamine receptor expression in rat renal proximal tubule cells. Hypertens Res 2017; 40:652-657. [PMID: 28230199 DOI: 10.1038/hr.2017.13] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 12/27/2016] [Accepted: 12/28/2016] [Indexed: 12/22/2022]
Abstract
Both the dopaminergic and renin-angiotensin systems play important roles in the regulation of blood pressure. Our previous study showed that the stimulation of dopaminergic D4 receptors reduced angiotensin II type 1 (AT1) receptor expression in renal proximal tubule (RPT) cells. In this study, we tested whether AT1 receptors, in return, would regulate D4 receptor expression and function in RPT cells. Expression of the D4 receptor from Wistar-Kyoto (WKY) or spontaneously hypertensive rats (SHRs) RPT cells and renal cortex tissues were determined by western blot, and Na+-K+ ATPase activity was determined using an enzyme assay. Urine volume and urine sodium of WKY rats and SHRs treated with or without D4 receptor stimulation were measured. Thus, activation of AT1 receptors with angiotensin II (Ang II) increased D4 receptor protein expression in RPT cells, and this increase was blocked by nicardipine, a calcium influx blocker. The D4 receptor agonist PD168077 inhibited Na+-K+ ATPase activity in WKY RPT cells but not in SHR RPT cells. Ang II pre-treatment promoted D4 receptor-mediated inhibition of Na+-K+ ATPase in RPT cells in WKY rats but not in SHRs. Meanwhile, Ang II pre-treatment augmented the natriuretic effect of PD168077 in WKY rats but not in SHRs. In conclusion, AT1 stimulation can regulate the expression and natriuretic function of dopaminergic D4 receptors in RPT cells and might be involved in the pathogenesis of essential hypertension.
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Affiliation(s)
- Luxun Tang
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Institute of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Cardiovascular Clinical Research Center, Daping Hospital, Third Military Medical University, Chongqing, PR China
| | - Shuo Zheng
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Institute of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Cardiovascular Clinical Research Center, Daping Hospital, Third Military Medical University, Chongqing, PR China
| | - Hongmei Ren
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Institute of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Cardiovascular Clinical Research Center, Daping Hospital, Third Military Medical University, Chongqing, PR China
| | - Duofen He
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Institute of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Cardiovascular Clinical Research Center, Daping Hospital, Third Military Medical University, Chongqing, PR China
| | - Chunyu Zeng
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Institute of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Cardiovascular Clinical Research Center, Daping Hospital, Third Military Medical University, Chongqing, PR China
| | - Wei Eric Wang
- Department of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Institute of Cardiology, Daping Hospital, Third Military Medical University, Chongqing, PR China.,Chongqing Cardiovascular Clinical Research Center, Daping Hospital, Third Military Medical University, Chongqing, PR China
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16
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Jiang X, Chen W, Liu X, Wang Z, Liu Y, Felder RA, Gildea JJ, Jose PA, Qin C, Yang Z. The Synergistic Roles of Cholecystokinin B and Dopamine D5 Receptors on the Regulation of Renal Sodium Excretion. PLoS One 2016; 11:e0146641. [PMID: 26751218 PMCID: PMC4709046 DOI: 10.1371/journal.pone.0146641] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 12/21/2015] [Indexed: 01/07/2023] Open
Abstract
Renal dopamine D1-like receptors (D1R and D5R) and the gastrin receptor (CCKBR) are involved in the maintenance of sodium homeostasis. The D1R has been found to interact synergistically with CCKBR in renal proximal tubule (RPT) cells to promote natriuresis and diuresis. D5R, which has a higher affinity for dopamine than D1R, has some constitutive activity. Hence, we sought to investigate the interaction between D5R and CCKBR in the regulation of renal sodium excretion. In present study, we found D5R and CCKBR increase each other’s expression in a concentration- and time-dependent manner in the HK-2 cell, the specificity of which was verified in HEK293 cells heterologously expressing both human D5R and CCKBR and in RPT cells from a male normotensive human. The specificity of D5R in the D5R and CCKBR interaction was verified further using a selective D5R antagonist, LE-PM436. Also, D5R and CCKBR colocalize and co-immunoprecipitate in BALB/c mouse RPTs and human RPT cells. CCKBR protein expression in plasma membrane-enriched fractions of renal cortex (PMFs) is greater in D5R-/- mice than D5R+/+ littermates and D5R protein expression in PMFs is also greater in CCKBR-/- mice than CCKBR+/+ littermates. High salt diet, relative to normal salt diet, increased the expression of CCKBR and D5R proteins in PMFs. Disruption of CCKBR in mice caused hypertension and decreased sodium excretion. The natriuresis in salt-loaded BALB/c mice was decreased by YF476, a CCKBR antagonist and Sch23390, a D1R/D5R antagonist. Furthermore, the natriuresis caused by gastrin was blocked by Sch23390 while the natriuresis caused by fenoldopam, a D1R/D5R agonist, was blocked by YF476. Taken together, our findings indicate that CCKBR and D5R synergistically interact in the kidney, which may contribute to the maintenance of normal sodium balance following an increase in sodium intake.
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Affiliation(s)
- Xiaoliang Jiang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
| | - Wei Chen
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
| | - Xing Liu
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
| | - Zihao Wang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
| | - Yunpeng Liu
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
| | - Robin A. Felder
- Department of Pathology, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
| | - John J. Gildea
- Department of Pathology, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America
| | - Pedro A. Jose
- Division of Nephrology, Departments of Medicine and Physiology, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
- * E-mail: (PAJ); (CQ); (ZWY)
| | - Chuan Qin
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
- * E-mail: (PAJ); (CQ); (ZWY)
| | - Zhiwei Yang
- Institute of Laboratory Animal Science, Chinese Academy of Medical Sciences (CAMS) & Comparative Medicine Centre, Peking Union Medical Collage (PUMC), Beijing, P. R. China
- CollaborativeInnovation Center for Cardiovascular Disorders, Beijing, P. R. China
- * E-mail: (PAJ); (CQ); (ZWY)
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17
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Abdel-Fattah MAO, Abadi AH, Lehmann J, Schweikert PM, Enzensperger C. D1-like receptors distinguishing thieno-azecine regioisomers. MEDCHEMCOMM 2015. [DOI: 10.1039/c5md00258c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Design of novel azecine derivatives with modulated dopaminergic receptor selectivity and affinity profiles.
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Affiliation(s)
- Mohamed A. O. Abdel-Fattah
- Institute of Pharmacy
- Department of Pharmaceutical and Medicinal Chemistry
- Friedrich-Schiller-Universität Jena
- D-07743 Jena
- Germany
| | - Ashraf H. Abadi
- Department of Pharmaceutical Chemistry
- Faculty of Pharmacy and Biotechnology
- German University in Cairo
- Cairo 11835
- Egypt
| | - Jochen Lehmann
- Institute of Pharmacy
- Department of Pharmaceutical and Medicinal Chemistry
- Friedrich-Schiller-Universität Jena
- D-07743 Jena
- Germany
| | - Peter M. Schweikert
- Institute of Pharmacy
- Department of Pharmaceutical and Medicinal Chemistry
- Friedrich-Schiller-Universität Jena
- D-07743 Jena
- Germany
| | - Christoph Enzensperger
- Institute of Organic Chemistry and Macromolecular Chemistry
- Friedrich-Schiller-Universität Jena
- D-07743 Jena
- Germany
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18
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Signaling pathways involved in renal oxidative injury: role of the vasoactive peptides and the renal dopaminergic system. JOURNAL OF SIGNAL TRANSDUCTION 2014; 2014:731350. [PMID: 25436148 PMCID: PMC4243602 DOI: 10.1155/2014/731350] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 10/16/2014] [Indexed: 12/24/2022]
Abstract
The physiological hydroelectrolytic balance and the redox steady state in the kidney are accomplished by an intricate interaction between signals from extrarenal and intrarenal sources and between antinatriuretic and natriuretic factors. Angiotensin II, atrial natriuretic peptide and intrarenal dopamine play a pivotal role in this interactive network. The balance between endogenous antioxidant agents like the renal dopaminergic system and atrial natriuretic peptide, by one side, and the prooxidant effect of the renin angiotensin system, by the other side, contributes to ensuring the normal function of the kidney. Different pathological scenarios, as nephrotic syndrome and hypertension, where renal sodium excretion is altered, are associated with an impaired interaction between two natriuretic systems as the renal dopaminergic system and atrial natriuretic peptide that may be involved in the pathogenesis of renal diseases. The aim of this review is to update and comment the most recent evidences about the intracellular pathways involved in the relationship between endogenous antioxidant agents like the renal dopaminergic system and atrial natriuretic peptide and the prooxidant effect of the renin angiotensin system in the pathogenesis of renal inflammation.
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19
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Chen K, Deng K, Wang X, Wang Z, Zheng S, Ren H, He D, Han Y, Asico LD, Jose PA, Zeng C. Activation of D4 dopamine receptor decreases angiotensin II type 1 receptor expression in rat renal proximal tubule cells. Hypertension 2014; 65:153-60. [PMID: 25368031 DOI: 10.1161/hypertensionaha.114.04038] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The dopaminergic and renin-angiotensin systems interact to regulate blood pressure. Disruption of the D4 dopamine receptor gene in mice produces hypertension that is associated with increased renal angiotensin type 1 (AT1) receptor expression. We hypothesize that the D4 receptor can inhibit AT1 receptor expression and function in renal proximal tubule cells from Wistar-Kyoto (WKY) rats, but the D4 receptor regulation of AT1 receptor is aberrant in renal proximal tubule cells from spontaneously hypertensive rats (SHRs). The D4 receptor agonist, PD168077, decreased AT1 receptor protein expression in a time- and concentration-dependent manner in WKY cells. By contrast, in SHR cells, PD168077 increased AT1 receptor protein expression. The inhibitory effect of D4 receptor on AT1 receptor expression in WKY cells was blocked by a calcium channel blocker, nicardipine, or calcium-free medium, indicating that calcium is involved in the D4 receptor-mediated signaling pathway. Angiotensin II increased Na(+)-K(+) ATPase activity in WKY cells. Pretreatment with PD168077 decreased the stimulatory effect of angiotensin II on Na(+)-K(+) ATPase activity in WKY cells. In SHR cells, the inhibitory effect of D4 receptor on angiotensin II-mediated stimulation of Na(+)-K(+) ATPase activity was aberrant; pretreatment with PD168077 augmented the stimulatory effect of AT1 receptor on Na(+)-K(+) ATPase activity in SHR cells. This was confirmed in vivo; pretreatment with PD128077 for 1 week augmented the antihypertensive and natriuretic effect of losartan in SHRs but not in WKY rats. We suggest that an aberrant interaction between D4 and AT1 receptors may play a role in the abnormal regulation of sodium excretion in hypertension.
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Affiliation(s)
- Ken Chen
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Kun Deng
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Xiaoyan Wang
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Zhen Wang
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Shuo Zheng
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Hongmei Ren
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Duofen He
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Yu Han
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Laureano D Asico
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Pedro A Jose
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.)
| | - Chunyu Zeng
- From the Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); Chongqing Institute of Cardiology, Chongqing, People's Republic of China (K.C., K.D., Z.W., S.Z., H.R., D.H., Y.H., C.Z.); and Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD (X.W., L.D.A., P.A.J.).
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Yu P, Sun M, Villar VAM, Zhang Y, Weinman EJ, Felder RA, Jose PA. Differential dopamine receptor subtype regulation of adenylyl cyclases in lipid rafts in human embryonic kidney and renal proximal tubule cells. Cell Signal 2014; 26:2521-9. [PMID: 25049074 DOI: 10.1016/j.cellsig.2014.07.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2014] [Accepted: 07/09/2014] [Indexed: 01/11/2023]
Abstract
Dopamine D1-like receptors (D1R and D5R) stimulate adenylyl cyclase (AC) activity, whereas the D2-like receptors (D2, D3 and D4) inhibit AC activity. D1R, but not the D5R, has been reported to regulate AC activity in lipid rafts (LRs). We tested the hypothesis that D1R and D5R differentially regulate AC activity in LRs using human embryonic kidney (HEK) 293 cells heterologously expressing human D1 or D5 receptor (HEK-hD1R or HEK-hD5R) and human renal proximal tubule (hRPT) cells that endogenously express D1R and D5R. Of the AC isoforms expressed in HEK and hRPT cells (AC3, AC5, AC6, AC7, and AC9), AC5/6 was distributed to a greater extent in LRs than non-LRs in HEK-hD1R (84.5±2.3% of total), HEK-hD5R (68.9±3.1% of total), and hRPT cells (66.6 ± 2.2% of total) (P<0.05, n=4/group). In HEK-hD1R cells, the D1-like receptor agonist fenoldopam (1 μM/15 min) increased AC5/6 protein (+17.2 ± 3.9% of control) in LRs but decreased it in non-LRs (-47.3±5.3% of control) (P<0.05, vs. control, n=4/group). By contrast, in HEK-hD5R cells, fenoldopam increased AC5/6 protein in non-LRs (+67.1 ± 5.3% of control, P<0.006, vs. control, n=4) but had no effect in LRs. In hRPT cells, fenoldopam increased AC5/6 in LRs but had little effect in non-LRs. Disruption of LRs with methyl-β-cyclodextrin decreased basal AC activity in HEK-D1R (-94.5 ± 2.0% of control) and HEK-D5R cells (-87.1 ± 4.6% of control) but increased it in hRPT cells (6.8±0.5-fold). AC6 activity was stimulated to a greater extent by D1R than D5R, in agreement with the greater colocalization of AC5/6 with D1R than D5R in LRs. We conclude that LRs are essential not only for the proper membrane distribution and maintenance of AC5/6 activity but also for the regulation of D1R- and D5R-mediated AC signaling.
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Affiliation(s)
- Peiying Yu
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Min Sun
- Department of Biological Sciences, School of Life Science, Anhui University, Anhui, China
| | - Van Anthony M Villar
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Yanrong Zhang
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Edward J Weinman
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States
| | - Robin A Felder
- Department of Pathology, University of Virginia Health Sciences Center, Charlottesville, VA 22903, United States
| | - Pedro A Jose
- Division of Nephrology, Department of Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, United States; Department of Physiology, University of Maryland School of Medicine, Baltimore, MD 21201, United States
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21
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Gildea JJ, Shah IT, Van Sciver RE, Israel JA, Enzensperger C, McGrath HE, Jose PA, Felder RA. The cooperative roles of the dopamine receptors, D1R and D5R, on the regulation of renal sodium transport. Kidney Int 2014; 86:118-26. [PMID: 24552847 PMCID: PMC4077925 DOI: 10.1038/ki.2014.5] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 11/27/2013] [Accepted: 12/12/2013] [Indexed: 02/07/2023]
Abstract
Determining the individual roles of the two dopamine D1-like receptors (D1R and D5R) on sodium transport in the human renal proximal tubule has been complicated by their structural and functional similarity. Here we used a novel D5R-selective antagonist (LE-PM436) and D1R or D5R-specific gene silencing to determine second messenger coupling pathways and heterologous receptor interaction between the two receptors. D1R and D5R co-localized in renal proximal tubule cells and physically interact, as determined by co-immunoprecipitation and FRET microscopy. Stimulation of renal proximal tubule cells with fenoldopam (D1R/D5R agonist) led to both adenylyl cyclase and phospholipase C (PLC) activation using real-time FRET biosensors ICUE3 and CYPHR, respectively. Fenoldopam increased cAMP accumulation and PLC activity and inhibited both NHE3 and NaKATPase activities. LE-PM436 and D5R siRNA blocked the fenoldopam-stimulated PLC pathway but not cAMP accumulation, while D1R siRNA blocked both fenoldopam-stimulated cAMP accumulation and PLC signaling. Either D1R or D5R siRNA, or LE-PM436 blocked the fenoldopam dependent inhibition of sodium transport. Further studies using the cAMP-selective D1R/D5R agonist SKF83822 and PLC-selective D1R/D5R agonist SKF83959 confirmed the cooperative influence of the two pathways on sodium transport. Thus, D1R and D5R interact in the inhibition of NHE3 and NaKATPase activity, the D1R primarily by cAMP, while the D1R/D5R heteromer modulates the D1R effect through a PLC pathway.
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Affiliation(s)
- John J Gildea
- The University of Virginia Health System, Department of Pathology, Charlottesville, Virginia, USA
| | - Ishan T Shah
- The University of Virginia Health System, Department of Pathology, Charlottesville, Virginia, USA
| | - Robert E Van Sciver
- The University of Virginia Health System, Department of Pathology, Charlottesville, Virginia, USA
| | - Jonathan A Israel
- The University of Virginia Health System, Department of Pathology, Charlottesville, Virginia, USA
| | - Christoph Enzensperger
- Institut für Pharmazie, Lehrstuhl für Pharmazeutische/Medizinische Chemie, Friedrich-Schiller-Universität Jena, Jena, Germany
| | - Helen E McGrath
- The University of Virginia Health System, Department of Pathology, Charlottesville, Virginia, USA
| | - Pedro A Jose
- University of Maryland School of Medicine, Departments of Medicine and Physiology, Baltimore, Maryland, USA
| | - Robin A Felder
- The University of Virginia Health System, Department of Pathology, Charlottesville, Virginia, USA
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22
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Wang S, Lu X, Yang J, Wang H, Chen C, Han Y, Ren H, Zheng S, He D, Zhou L, Asico LD, Wang WE, Jose PA, Zeng C. Regulation of renalase expression by D5 dopamine receptors in rat renal proximal tubule cells. Am J Physiol Renal Physiol 2014; 306:F588-96. [PMID: 24500688 DOI: 10.1152/ajprenal.00196.2013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The dopaminergic and sympathetic systems interact to regulate blood pressure. Our previous studies showed regulation of α1-adrenergic receptor function by D1-like dopamine receptors in vascular smooth muscle cells. Because renalase could regulate circulating epinephrine levels and dopamine production in renal proximal tubules (RPTs), we tested the hypothesis that D1-like receptors regulate renalase expression in kidney. The effect of D1-like receptor stimulation on renalase expression and function was measured in immortalized RPT cells from Wistar-Kyoto (WKY) and spontaneously hypertensive rats (SHRs). We found that the D1-like receptor agonist fenoldopam (10(-7)-10(-5) mol/l) increased renalase protein expression and function in WKY RPT cells but decreased them in SHR cells. Fenoldopam also increased renalase mRNA levels in WKY but not in SHR cells. In contrast, fenoldopam increased the degradation of renalase protein in SHR cells but not in WKY cells. The regulation of renalase by the D1-like receptor was mainly via the D5 receptor because silencing of the D5 but not D1 receptor by antisense oligonucleotides blocked the stimulatory effect of the D1-like receptor on renalase expression in WKY cells. Moreover, inhibition of PKC, by the PKC inhibitor 19-31, blocked the stimulatory effect of fenoldopam on renalase expression while stimulation of PKC, by a PKC agonist (PMA), increased renalase expression, indicating that PKC is involved in the process. Our studies suggest that the D5 receptor positively regulates renalase expression in WKY but not SHR RPT cells; aberrant regulation of renalase by the D5 receptor may be involved in the pathogenesis of hypertension.
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Affiliation(s)
- Shaoxiong Wang
- Dept. of Cardiology, Daping Hospital, The Third Military Medical Univ., Chongqing, P.R. China.
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23
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Chinese herbal formulas for treating hypertension in traditional Chinese medicine: perspective of modern science. Hypertens Res 2013; 36:570-9. [PMID: 23552514 PMCID: PMC3703711 DOI: 10.1038/hr.2013.18] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 11/26/2012] [Accepted: 12/12/2012] [Indexed: 12/16/2022]
Abstract
Hypertension, which directly threatens quality of life, is a major contributor to cardiovascular and cerebrovascular events. Over the past two decades, domestic and foreign scholars have agreed upon various standards in the treatment of hypertension, and considerable progress has been made in the field of antihypertensive drugs. Oral antihypertensive drugs represent a milestone in hypertension therapy. However, the blood pressure standard for patients with hypertension is far from satisfactory. The study of Chinese herbal formulas for treating hypertension has received much research attention. These studies seek to integrate traditional and Western medicine in China. Currently, Chinese herbal formulas are known to have an outstanding advantage with regard to bodily regulation. Research shows that Chinese medicine has many protective mechanisms. This paper addresses the process of the antihypertensive mechanisms in Chinese herbal formulas for treating hypertension. These mechanisms are to be discussed in future research.
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24
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Villar VAM, Jones JE, Armando I, Asico LD, Escano CS, Lee H, Wang X, Yang Y, Pascua-Crusan AM, Palmes-Saloma CP, Felder RA, Jose PA. Sorting nexin 1 loss results in D5 dopamine receptor dysfunction in human renal proximal tubule cells and hypertension in mice. J Biol Chem 2012; 288:152-63. [PMID: 23152498 DOI: 10.1074/jbc.m112.428458] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The peripheral dopaminergic system plays a crucial role in blood pressure regulation through its actions on renal hemodynamics and epithelial ion transport. The dopamine D5 receptor (D(5)R) interacts with sorting nexin 1 (SNX1), a protein involved in receptor retrieval from the trans-Golgi network. In this report, we elucidated the spatial, temporal, and functional significance of this interaction in human renal proximal tubule cells and HEK293 cells stably expressing human D(5)R and in mice. Silencing of SNX1 expression via RNAi resulted in the failure of D(5)R to internalize and bind GTP, blunting of the agonist-induced increase in cAMP production and decrease in sodium transport, and up-regulation of angiotensin II receptor expression, of which expression was previously shown to be negatively regulated by D(5)R. Moreover, siRNA-mediated depletion of renal SNX1 in C57BL/6J and BALB/cJ mice resulted in increased blood pressure and blunted natriuretic response to agonist in salt-loaded BALB/cJ mice. These data demonstrate a crucial role for SNX1 in D(5)R trafficking and that SNX1 depletion results in D(5)R dysfunction and thus may represent a novel mechanism for the pathogenesis of essential hypertension.
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Affiliation(s)
- Van Anthony M Villar
- Center for Molecular Physiology Research, Children's Research Institute, Children's National Medical Center, Washington DC 20010, USA.
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Chugh G, Pokkunuri I, Asghar M. Renal dopamine and angiotensin II receptor signaling in age-related hypertension. Am J Physiol Renal Physiol 2012; 304:F1-7. [PMID: 23097467 DOI: 10.1152/ajprenal.00441.2012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Kidneys play a vital role in long-term regulation of blood pressure. This is achieved by actions of many renal and nonrenal factors acting on the kidney that help maintain the body's water and electrolyte balance and thus control blood pressure. Several endogenously formed or circulating hormones/peptides, by acting within the kidney, regulate fluid and water homeostasis and blood pressure. Dopamine and angiotensin II are the two key renal factors that, via acting on their receptors and counterregulating each other's function, maintain water and sodium balance. In this review, we provide recent advances in the signaling cascades of these renal receptors, especially at the level of their cross talk, and discuss their roles in blood pressure regulation in the aging process.
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Affiliation(s)
- Gaurav Chugh
- Heart and Kidney Institute, College of Pharmacy, Univ. of Houston, Houston, TX 77204, USA
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26
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Gildea JJ, Wang X, Shah N, Tran H, Spinosa M, Van Sciver R, Sasaki M, Yatabe J, Carey RM, Jose PA, Felder RA. Dopamine and angiotensin type 2 receptors cooperatively inhibit sodium transport in human renal proximal tubule cells. Hypertension 2012; 60:396-403. [PMID: 22710646 DOI: 10.1161/hypertensionaha.112.194175] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Little is known regarding how the kidney shifts from a sodium and water reclaiming state (antinatriuresis) to a state where sodium and water are eliminated (natriuresis). In human renal proximal tubule cells, sodium reabsorption is decreased by the dopamine D(1)-like receptors (D(1)R/D(5)R) and the angiotensin type 2 receptor (AT(2)R), whereas the angiotensin type 1 receptor increases sodium reabsorption. Aberrant control of these opposing systems is thought to lead to sodium retention and, subsequently, hypertension. We show that D(1)R/D(5)R stimulation increased plasma membrane AT(2)R 4-fold via a D(1)R-mediated, cAMP-coupled, and protein phosphatase 2A-dependent specific signaling pathway. D(1)R/D(5)R stimulation also reduced the ability of angiotensin II to stimulate phospho-extracellular signal-regulated kinase, an effect that was partially reversed by an AT(2)R antagonist. Fenoldopam did not increase AT(2)R recruitment in renal proximal tubule cells with D(1)Rs uncoupled from adenylyl cyclase, suggesting a role of cAMP in mediating these events. D(1)Rs and AT(2)Rs heterodimerized and cooperatively increased cAMP and cGMP production, protein phosphatase 2A activation, sodium-potassium-ATPase internalization, and sodium transport inhibition. These studies shed new light on the regulation of renal sodium transport by the dopaminergic and angiotensin systems and potential new therapeutic targets for selectively treating hypertension.
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Affiliation(s)
- John J Gildea
- University of Virginia, Charlottesville, VA 22908, USA.
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27
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Yang S, Yao B, Zhou Y, Yin H, Zhang MZ, Harris RC. Intrarenal dopamine modulates progressive angiotensin II-mediated renal injury. Am J Physiol Renal Physiol 2011; 302:F742-9. [PMID: 22169008 DOI: 10.1152/ajprenal.00583.2011] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
It is well-recognized that excessive angiotensin II (ANG II) can mediate progressive renal injury. Previous studies by us and others have indicated that dopamine may modulate actions of ANG II in the kidney. The current studies investigated whether altering intrarenal dopamine levels affected ANG II-mediated renal fibrosis. We utilized a model of increased intrarenal dopamine, catechol-O-methyl-transferase knockout (COMT KO) mice, which have increased kidney dopamine levels due to deletion of a major intrarenal dopamine-metabolizing enzyme. In wild-type mice, chronic ANG II infusion increased renal expression of both of the major dopamine-metabolizing enzymes, COMT and monoamine oxidase. After 8 wk of ANG II infusion, there were no significant differences in blood pressure between wild-type and COMT KO mice. Compared with wild-type, COMT KO mice had decreased albuminuria and tubulointerstitial injury. In response to ANG II infusion, there was decreased expression of both glomerular and tubulointerstitial injury markers (fibronectin, connective tissue growth factor, fibroblast-specific protein-1, collagen I, podocyte vascular endothelial growth factor) in COMT KO mice. We recently reported that ANG II-mediated tubulointerstitial fibrosis is mediated by src-dependent epidermal growth factor receptor (EGFR) activation. In aromatic l-amino acid decarboxylase knockout (AADC KO) mice, a model of intrarenal dopamine deficiency due to selective proximal tubule AADC deletion, which inhibits intrarenal dopamine synthesis, ANG II infusion further increased expression of p-src and pTyr845-EGFR. In contrast, their expression was markedly attenuated in COMT KO mice. These results demonstrate a role for intrarenal dopamine to buffer the detrimental effects of ANG II upon the kidney.
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Affiliation(s)
- Shilin Yang
- Nashville Veterans Affairs Hospital and Vanderbilt University School of Medicine, Nashville, Tennessee 37232, USA
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28
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Hashikawa-Hobara N, Chan NYK, Levi R. Histamine 3 receptor activation reduces the expression of neuronal angiotensin II type 1 receptors in the heart. J Pharmacol Exp Ther 2011; 340:185-91. [PMID: 22011436 DOI: 10.1124/jpet.111.187765] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
In severe myocardial ischemia, histamine 3 (H₃) receptor activation affords cardioprotection by preventing excessive norepinephrine release and arrhythmias; pivotal to this action is the inhibition of neuronal Na⁺/H⁺ exchanger (NHE). Conversely, angiotensin II, formed locally by mast cell-derived renin, stimulates NHE via angiotensin II type 1 (AT₁) receptors, facilitating norepinephrine release and arrhythmias. Thus, ischemic dysfunction may depend on a balance between the NHE-modulating effects of H₃ receptors and AT₁ receptors. The purpose of this investigation was therefore to elucidate the H₃/AT₁ receptor interaction in myocardial ischemia/reperfusion. We found that H₃ receptor blockade with clobenpropit increased norepinephrine overflow and arrhythmias in Langendorff-perfused guinea pig hearts subjected to ischemia/reperfusion. This coincided with increased neuronal AT₁ receptor expression. NHE inhibition with cariporide prevented both increases in norepinephrine release and AT₁ receptor expression. Moreover, norepinephrine release and AT₁ receptor expression were increased by the nitric oxide (NO) synthase inhibitor N(G)-methyl-L-arginine and the protein kinase C activator phorbol myristate acetate. H₃ receptor activation in differentiated sympathetic neuron-like PC12 cells permanently transfected with H₃ receptor cDNA caused a decrease in protein kinase C activity and AT₁ receptor protein abundance. Collectively, our findings suggest that neuronal H₃ receptor activation inhibits NHE by diminishing protein kinase C activity. Reduced NHE activity sequentially causes intracellular acidification, increased NO synthesis, and diminished AT₁ receptor expression. Thus, H₃ receptor-mediated NHE inhibition in ischemia/reperfusion not only opposes the angiotensin II-induced stimulation of NHE in cardiac sympathetic neurons, but also down-regulates AT₁ receptor expression. Cardioprotection ultimately results from the combined attenuation of angiotensin II and norepinephrine effects and alleviation of arrhythmias.
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29
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Abstract
Dopamine is an important regulator of systemic blood pressure via multiple mechanisms. It affects fluid and electrolyte balance by its actions on renal hemodynamics and epithelial ion and water transport and by regulation of hormones and humoral agents. The kidney synthesizes dopamine from circulating or filtered L-DOPA independently from innervation. The major determinants of the renal tubular synthesis/release of dopamine are probably sodium intake and intracellular sodium. Dopamine exerts its actions via two families of cell surface receptors, D1-like receptors comprising D1R and D5R, and D2-like receptors comprising D2R, D3R, and D4R, and by interactions with other G protein-coupled receptors. D1-like receptors are linked to vasodilation, while the effect of D2-like receptors on the vasculature is variable and probably dependent upon the state of nerve activity. Dopamine secreted into the tubular lumen acts mainly via D1-like receptors in an autocrine/paracrine manner to regulate ion transport in the proximal and distal nephron. These effects are mediated mainly by tubular mechanisms and augmented by hemodynamic mechanisms. The natriuretic effect of D1-like receptors is caused by inhibition of ion transport in the apical and basolateral membranes. D2-like receptors participate in the inhibition of ion transport during conditions of euvolemia and moderate volume expansion. Dopamine also controls ion transport and blood pressure by regulating the production of reactive oxygen species and the inflammatory response. Essential hypertension is associated with abnormalities in dopamine production, receptor number, and/or posttranslational modification.
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Affiliation(s)
- Ines Armando
- Children’s National Medical Center—Center for Molecular Physiology Research, Washington, District of Columbia
| | - Van Anthony M. Villar
- Children’s National Medical Center—Center for Molecular Physiology Research, Washington, District of Columbia
| | - Pedro A. Jose
- Children’s National Medical Center—Center for Molecular Physiology Research, Washington, District of Columbia
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30
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Gildea JJ, Kemp BA, Howell NL, Van Sciver RE, Carey RM, Felder RA. Inhibition of renal caveolin-1 reduces natriuresis and produces hypertension in sodium-loaded rats. Am J Physiol Renal Physiol 2011; 300:F914-20. [PMID: 21289050 DOI: 10.1152/ajprenal.00380.2010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Renal dopamine receptor function and ion transport inhibition are impaired in essential hypertension. We recently reported that caveolin-1 (CAV1) and lipid rafts are necessary for normal D(1)-like receptor-dependent internalization of Na-K-ATPase in human proximal tubule cells. We now hypothesize that CAV1 is necessary for the regulation of urine sodium (Na(+)) excretion (U(Na)V) and mean arterial blood pressure (MAP) in vivo. Acute renal interstitial (RI) infusion into Sprague-Dawley rats of 1 μg·kg⁻¹·min⁻¹ fenoldopam (FEN; D(1)-like receptor agonist) caused a 0.46 ± 0.15-μmol/min increase in U(Na)V (over baseline of 0.29 ± 0.04 μmol/min; P < 0.01). This increase was seen in Na(+)-loaded rats, but not in those under a normal-sodium load. Coinfusion with β-methyl cyclodextrin (βMCD; lipid raft disrupter, 200 μg·kg⁻¹·min⁻¹) completely blocked this FEN-induced natriuresis (P < 0.001). Long-term (3 day) lipid raft disruption via continuous RI infusion of 80 μg·kg⁻¹·min⁻¹ βMCD decreased renal cortical CAV1 expression (47.3 ± 6.4%; P < 0.01) and increased MAP (32.4 ± 6.6 mmHg; P < 0.001) compared with vehicle-infused animals. To determine whether the MAP rise was due to a CAV1-dependent lipid raft-mediated disruption, Na(+)-loaded rats were given a bolus RI infusion of CAV1 siRNA. Two days postinfusion, cortical CAV1 expression was decreased by 73.6 ± 8.2% (P < 0.001) and the animals showed an increase in MAP by 17.4 ± 2.9 mmHg (P < 0.01) compared with animals receiving scrambled control siRNA. In summary, acute kidney-specific lipid raft disruption decreases CAV1 expression and blocks D(1)-like receptor-induced natriuresis. Furthermore, chronic disruption of lipid rafts or CAV1 protein expression in the kidney induces hypertension.
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Affiliation(s)
- John J Gildea
- Department of Pathology, The Univ. of Virginia, Charlottesville, VA 22908, USA
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31
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Zeng C, Jose PA. Dopamine receptors: important antihypertensive counterbalance against hypertensive factors. Hypertension 2010; 57:11-7. [PMID: 21098313 DOI: 10.1161/hypertensionaha.110.157727] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Chunyu Zeng
- Department of Cardiology, Daping Hospital, The Third Military Medical University, Chongqing City 400042, China.
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32
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Asico L, Zhang X, Jiang J, Cabrera D, Escano CS, Sibley DR, Wang X, Yang Y, Mannon R, Jones JE, Armando I, Jose PA. Lack of renal dopamine D5 receptors promotes hypertension. J Am Soc Nephrol 2010; 22:82-9. [PMID: 21051739 DOI: 10.1681/asn.2010050533] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Disruption of the dopamine D(5) receptor gene in mice increases BP and causes salt sensitivity. To determine the role of renal versus extrarenal D(5) receptors in BP regulation, we performed cross-renal transplantation experiments. BP was similar between wild-type mice and wild-type mice transplanted with wild-type kidneys, indicating that the transplantation procedure did not affect BP. BP was lower among D(5)(-/-) mice transplanted with wild-type kidneys than D(5)(-/-) kidneys, demonstrating that the renal D(5) receptors are important in BP control. BP was higher in wild-type mice transplanted with D(5)(-/-) kidneys than wild-type kidneys but not significantly different from syngenic transplanted D(5)(-/-) mice, indicating the importance of the kidney in the development of hypertension. On a high-salt diet, all mice with D(5)(-/-) kidneys excreted less sodium than mice with wild-type kidneys. Transplantation of a wild-type kidney into a D(5)(-/-) mouse decreased the renal expression of AT(1) receptors and Nox-2. Conversely, transplantation of a D(5)(-/-) kidney into a wild-type mouse increased the expression of both, suggesting that both renal and extrarenal factors are important in the regulation of AT(1) receptor and Nox-2 expression. These results highlight the role of renal D(5) receptors in BP homeostasis and the pathogenesis of hypertension.
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Affiliation(s)
- Laureano Asico
- Children's National Medical Center, Children's Research Institute, 111 Michigan Avenue NW, Washington, D.C., USA
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Gildea JJ, Shah I, Weiss R, Casscells ND, McGrath HE, Zhang J, Jones JE, Felder RA. HK-2 human renal proximal tubule cells as a model for G protein-coupled receptor kinase type 4-mediated dopamine 1 receptor uncoupling. Hypertension 2010; 56:505-11. [PMID: 20660820 DOI: 10.1161/hypertensionaha.110.152256] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
HK-2 human renal proximal tubule cells (RPTC) are commonly used in the in vitro study of "normal" RPTCs. We discovered recently that HK-2 cells are uncoupled from dopamine 1 receptor (D(1)R) adenylyl cyclase (AC) stimulation. We hypothesized that G protein-coupled receptor kinase type 4 (GRK4) single nucleotide polymorphisms may be responsible for the D(1)R/AC uncoupling in HK-2. This hypothesis was tested by genotyping GRK4 single nucleotide polymorphisms, measuring D(1)-like receptor agonist (fenoldopam)-stimulated cAMP accumulation, quantifying D(1)R inhibition of sodium transport, and testing the ability of GRK4 small interfering RNA to reverse the D(1)R/AC uncoupling. We compared HK-2 with 2 normally coupled human RPTC cell lines and 2 uncoupled RPTC cell lines. The HK-2 cell line was found to have 4 of 6 potential GRK4 single nucleotide polymorphisms known to uncouple the D(1)R from AC (namely, R65L, A142V, and A486V). AC response to fenoldopam stimulation was increased in the 2 normally coupled human RPTC cell lines (FEN: 2.02+/-0.05-fold and 2.33+/-0.19-fold over control; P<0.001; n=4) but not in the 2 uncoupled or HK-2 cell lines. GRK4 small interfering RNA rescued the fenoldopam-mediated AC stimulation in the uncoupled cells, including HK-2. The expected fenoldopam-mediated inhibition of sodium hydrogen exchanger type 3 was absent in HK-2 (n=6) and uncoupled RPTC cell lines (n=6) but was observed in the 2 normally coupled human RPTC cell lines (-25.41+/-4.7% and -27.36+/-2.70%; P<0.001; n=6), which express wild-type GRK4. Despite the fact that HK-2 cells retain many functional characteristics of RPTCs, they are not normal from the perspective of dopaminergic function.
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Affiliation(s)
- John J Gildea
- University of Virginia, PO Box 801400, Charlottesville, VA 22908, USA
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Natarajan A, Han G, Chen SY, Yu P, White R, Jose P. The d5 dopamine receptor mediates large-conductance, calcium- and voltage-activated potassium channel activation in human coronary artery smooth muscle cells. J Pharmacol Exp Ther 2009; 332:640-9. [PMID: 19864616 DOI: 10.1124/jpet.109.159871] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Large-conductance, calcium- and voltage-activated potassium (BK(Ca)) channels hyperpolarize coronary artery smooth muscle cells, causing vasorelaxation. Dopamine activates BK(Ca) channels by stimulating D(1)-like receptor-mediated increases in cAMP in porcine coronary artery myocytes. There are two D(1)-like receptors (R), D(1)R and D(5)R. We hypothesize that the specific D(1)-like receptor involved in BK(Ca) channel activation in human coronary artery smooth muscle cells (HCASMCs) is the D(5)R and that activation occurs via cAMP cross-activation of cGMP-dependent protein kinase (PKG), rather than cAMP-dependent protein kinase (PKA). The effects of D(1)-like receptor agonists and antagonists on BK(Ca) channel opening in HCASMCs were examined in the presence and absence of PKG/PKA inhibition by cell-attached patch clamp. In the absence of commercially available ligands specific for D(1)R or D(5)R, D(1)R or D(5)R protein was down-regulated by transfecting HCASMCs with human D(1)R or D(5)R antisense oligonucleotides, respectively: cells transfected with scrambled oligonucleotides and nontransfected HCASMCs served as controls. The predominant ion channel conducting outward currents in nontransfected HCASMCs was identified as the large-conductance, calcium- and voltage-activated potassium (BK(Ca)) channel, which was activated by D(1)-like receptor agonists despite PKA inhibition with (9R,10S,12S)-2,3,9,10,11,12-hexahydro-10-hydroxy-9-methyl-1-oxo-9,12-epoxy-1H-diindolo[1,2,3-fg:3',2',1'-kl]pyrrolo[3,4-i][1,6]benzodiazocine-10-carboxylic acid (KT 5720) (300 nM), but was abolished by inhibiting PKG with 9-methoxy-9-methoxycarbonyl-8-methyl-2,3,9,10-tetrahydro-8,11-epoxy-1H,8H,11H-2,7b-11a-triazadibenzo(a,g) cycloocta(cde)-trinden-1-one (KT 5823) (300 nM). D(1)-like receptor agonists activated BK(Ca) channels in all transfected cells except those transfected with D(5)R antisense oligonucleotides. Thus, the dopamine (D(1)-like) receptor mediates activation of BK(Ca) channels in HCASMCs by D(5)R, not D(1)R, and via PKG, not PKA. This is the first report of differential D(1)-like receptor regulation of vascular smooth muscle function in human cells.
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Affiliation(s)
- Aruna Natarajan
- Department of Pediatrics, Division of Critical Care, Georgetown University Hospital, Washington, DC 20007, USA.
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Gildea JJ, Israel JA, Johnson AK, Zhang J, Jose PA, Felder RA. Caveolin-1 and dopamine-mediated internalization of NaKATPase in human renal proximal tubule cells. Hypertension 2009; 54:1070-6. [PMID: 19752292 DOI: 10.1161/hypertensionaha.109.134338] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
In moderate sodium-replete states, dopamine 1-like receptors (D1R/D5R) are responsible for regulating >50% of renal sodium excretion. This is partly mediated by internalization and inactivation of NaKATPase, when associated with adapter protein 2. We used dopaminergic stimulation via fenoldopam (D1-like receptor agonist) to study the interaction among D1-like receptors, caveolin-1 (CAV1), and the G protein-coupled receptor kinase type 4 in cultured human renal proximal tubule cells (RPTCs). We compared 2 groups of RPTCs, 1 of cell lines that were isolated from normal subjects (nRPTCs) and a second group of cell lines that have D1-like receptors that are uncoupled (uncoupled RPTCs) from adenylyl cyclase second messengers. In nRPTCs, fenoldopam increased the plasma membrane expression of D1R (10.0-fold) and CAV1 (1.3-fold) and markedly decreased G protein-coupled receptor kinase type 4 by 94+/-8%; no effects were seen in uncoupled RPTCs. Fenoldopam also increased the association of adapter protein 2 and NaKATPase by 53+/-9% in nRPTCs but not in uncoupled RPTCs. When CAV1 expression was reduced by 86.0+/-8.5% using small interfering RNA, restimulation of the D1-like receptors with fenoldopam in nRPTCs resulted in only a 7+/-9% increase in association between adapter protein 2 and NaKATPase. Basal CAV1 expression and association with G protein-coupled receptor kinase type 4 was decreased in uncoupled RPTCs (58+/-5% decrease in association) relative to nRPTCs. We conclude that the scaffolding protein CAV1 is necessary for the association of D1-like receptors with G protein-coupled receptor kinase type 4 and the adapter protein 2-associated reduction in plasma membrane NaKATPase.
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Affiliation(s)
- John J Gildea
- Department of Pathology, University of Virginia Health System, Charlottesville, VA 22908, USA
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Xu J, Wang S, Wu Y, Song P, Zou MH. Tyrosine nitration of PA700 activates the 26S proteasome to induce endothelial dysfunction in mice with angiotensin II-induced hypertension. Hypertension 2009; 54:625-32. [PMID: 19597039 PMCID: PMC2910588 DOI: 10.1161/hypertensionaha.109.133736] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The ubiquitin-proteasome system has been implicated in oxidative stress-induced endothelial dysfunction in cardiovascular diseases. However, the mechanism by which oxidative stress alters the ubiquitin-proteasome system is poorly defined. The present study was conducted to determine whether oxidative modifications of PA700, a 26S proteasome regulatory subunit, contributes to angiotensin II (Ang II)-induced endothelial dysfunction. Exposure of human umbilical vein endothelial cells to low concentrations of Ang II, but not vehicle, for 6 hours significantly decreased the levels of tetrahydro-l-biopterin (BH4), an essential cofactor of endothelial NO synthase, which was accompanied by a decrease in GTP cyclohydrolase I, the rate-limiting enzyme for de novo BH4 synthesis. In addition, Ang II increased both tyrosine nitration of PA700 and the 26S proteasome activity, which were paralleled by increased coimmunoprecipitation of PA700 and the 20S proteasome. Genetic inhibition of NAD(P)H oxidase or administration of uric acid (a peroxynitrite scavenger) or N(G)-nitro-l-arginine methyl ester (nonselective NO synthase inhibitor) significantly attenuated Ang II-induced PA700 nitration, 26S proteasome activation, and reduction of GTP cyclohydrolase I and BH4. Finally, Ang II infusion in mice decreased the levels of both BH4 and GTP cyclohydrolase I and impaired endothelial-dependent relaxation in isolated aortas, and all of these effects were prevented by the administration of MG132, a potent inhibitor for 26S proteasome. We conclude that Ang II increases tyrosine nitration of PA700 resulting in accelerated GTP cyclohydrolase I degradation, BH4 deficiency, and consequent endothelial dysfunction in hypertension.
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Affiliation(s)
- Jian Xu
- Division of Endocrinology and Diabetes, Department of Medicine, University of Oklahoma Health Sciences Center, 941 Stanton L. Young Blvd, Oklahoma City, OK 73104, USA.
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Insulin increases D5 dopamine receptor expression and function in renal proximal tubule cells from Wistar-Kyoto rats. Am J Hypertens 2009; 22:770-6. [PMID: 19373217 DOI: 10.1038/ajh.2009.69] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Ion transport in the renal proximal tubule (RPT) is regulated by numerous hormones and humoral factors, including insulin and dopamine. Previous studies show an interaction between insulin and the D(1) receptor. Because both D(1) and D(5) receptors belong to the D(1)-like receptor subfamily, it is possible that an interaction between insulin and the D(5) dopamine receptor exists in RPT cells from normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHRs). METHODS D(5) receptor expression in immortalized RPT cells from WKY and SHRs was quantified by immunoblotting and D(5) receptor function by measuring Na(+)-K(+) ATPase activity. RESULTS Insulin increased the expression of the D(5) receptor. Stimulation with insulin (10(-7) mol/l) for 24 h increased D(5) receptor expression in RPT cells from WKY rats. This effect of insulin on D(5) receptor expression was aberrant in RPT cells from SHRs. The stimulatory effect of insulin on D(5) receptor expression in RPT cells from WKY rats was inhibited by a protein kinase C (PKC) inhibitor (PKC inhibitor peptide 19-31, 10(-6) mol/l) or a phosphatidylinositol 3 (PI3) kinase inhibitor (wortmannin, 10(-6) mol/l), indicating that both PKC and PI3 kinase were involved in the signaling pathway. Stimulation of the D(5) receptor heterologously expressed in HEK293 cells with fenoldopam (10(-7) mol/l/15 min) inhibited Na(+)-K(+) ATPase activity, whereas pretreatment with insulin (10(-7) mol/l/24 h) increased the D(5) receptor-mediated inhibition. CONCLUSIONS Insulin and D(5) receptors interact to regulate renal sodium transport; an aberrant interaction between insulin and D(5) receptor may participate in the pathogenesis of hypertension.
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Villar VAM, Jones JE, Armando I, Palmes-Saloma C, Yu P, Pascua AM, Keever L, Arnaldo FB, Wang Z, Luo Y, Felder RA, Jose PA. G protein-coupled receptor kinase 4 (GRK4) regulates the phosphorylation and function of the dopamine D3 receptor. J Biol Chem 2009; 284:21425-34. [PMID: 19520868 DOI: 10.1074/jbc.m109.003665] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
During conditions of moderate sodium excess, the dopaminergic system regulates blood pressure and water and electrolyte balance by engendering natriuresis. Dopamine exerts its effects on dopamine receptors, including the dopamine D(3) receptor. G protein-coupled receptor kinase 4 (GRK4), whose gene locus (4p16.3) is linked to essential hypertension, desensitizes the D(1) receptor, another dopamine receptor. This study evaluated the role of GRK4 on D(3) receptor function in human proximal tubule cells. D(3) receptor co-segregated in lipid rafts and co-immunoprecipitated and co-localized in human proximal tubule cells and in proximal and distal tubules and glomeruli of kidneys of Wistar Kyoto rats. Bimolecular fluorescence complementation and confocal microscopy revealed that agonist activation of the receptor initiated the interaction between D(3) receptor and GRK4 at the cell membrane and promoted it intracellularly, presumably en route to endosomal trafficking. Of the four GRK4 splice variants, GRK4-gamma and GRK4-alpha mediated a 3- and 2-fold increase in the phosphorylation of agonist-activated D(3) receptor, respectively. Inhibition of GRK activity with heparin or knockdown of GRK4 expression via RNA interference completely abolished p44/42 phosphorylation and mitogenesis induced by D(3) receptor stimulation. These data demonstrate that GRK4, specifically the GRK4-gamma and GRK4-alpha isoforms, phosphorylates the D(3) receptor and is crucial for its signaling in human proximal tubule cells.
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Affiliation(s)
- Van Anthony M Villar
- National Institute of Molecular Biology and Biotechnology, University of the Philippines, Diliman, Quezon City 1101, Philippines.
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Dopamine and angiotensin as renal counterregulatory systems controlling sodium balance. Curr Opin Nephrol Hypertens 2009; 18:28-32. [PMID: 19077686 DOI: 10.1097/mnh.0b013e32831a9e0b] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
PURPOSE OF REVIEW To review the recent evidence demonstrating how the renal dopaminergic and angiotensin systems control renal electrolyte balance through various receptor-mediated pathways with counterregulatory interactions. RECENT FINDINGS Stimulation of the renal rennin-angiotensin system results in increased sodium reabsorption, whereas the opposite is true for stimulation of the renal dopaminergic system. An underactive renal dopaminergic system has been associated with increased sodium reabsorption and hypertension. Recent findings indicate novel cell surface receptor-mediated mechanisms by which these two renal endocrine systems directly counterregulate each other. Each of the dopamine receptors (D1R through D5R) have been implicated in dopamine-mediated natriuresis, in addition to counterregulating the angiotensin type 1 R. Dopamine D1-like (D1R and D5R) stimulation has also been found to induce an AT2 receptor- dependent natriuresis. Recently, it has also been discovered that reactive oxygen species can play a role in inactivating the D1 receptor and activating the angiotensin type 1 R. SUMMARY Current therapeutic interventions for hypertension predominantly involve correction of an overactive rennin-angiotensin aldosterone system. Recent evidence suggests that stimulation of the renal dopaminergic system and possibly activation of AT2 receptors, as well as decreasing reactive oxygen species, may provide additional therapeutic approaches.
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Current World Literature. Curr Opin Nephrol Hypertens 2009; 18:91-3. [DOI: 10.1097/mnh.0b013e32831fd875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Wang X, Villar VAM, Armando I, Eisner GM, Felder RA, Jose PA. Dopamine, kidney, and hypertension: studies in dopamine receptor knockout mice. Pediatr Nephrol 2008; 23:2131-46. [PMID: 18615257 PMCID: PMC3724362 DOI: 10.1007/s00467-008-0901-3] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2008] [Revised: 04/18/2008] [Accepted: 05/07/2008] [Indexed: 02/06/2023]
Abstract
Dopamine is important in the pathogenesis of hypertension because of abnormalities in receptor-mediated regulation of renal sodium transport. Dopamine receptors are classified into D(1)-like (D(1), D(5)) and D(2)-like (D(2), D(3), D(4)) subtypes, all of which are expressed in the kidney. Mice deficient in specific dopamine receptors have been generated to provide holistic assessment on the varying physiological roles of each receptor subtype. This review examines recent studies on these mutant mouse models and evaluates the impact of individual dopamine receptor subtypes on blood pressure regulation.
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Affiliation(s)
- Xiaoyan Wang
- Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA
| | | | - Ines Armando
- Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA
| | - Gilbert M. Eisner
- Department of Medicine, Georgetown University Medical Center, Washington, DC, USA
| | - Robin A. Felder
- Department of Pathology, University of Virginia Health Sciences Center, Charlottesville, VA, USA
| | - Pedro A. Jose
- Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA
- Department of Physiology and Biophysics, Georgetown University Medical Center, Washington, DC, USA
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