1
|
Eguchi S, Sparks MA, Sawada H, Lu HS, Daugherty A, Zhuo JL. Recent Advances in Understanding the Molecular Pathophysiology of Angiotensin II Receptors: Lessons From Cell-Selective Receptor Deletion in Mice. Can J Cardiol 2023; 39:1795-1807. [PMID: 37394059 DOI: 10.1016/j.cjca.2023.06.421] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 06/08/2023] [Accepted: 06/20/2023] [Indexed: 07/04/2023] Open
Abstract
The renin-angiotensin system (RAS) is an essential hormonal system involved in water and sodium reabsorption, renal blood flow regulation, and arterial constriction. Systemic stimulation of the RAS with infusion of the main peptide angiotensin II (Ang II) in animals as well as pathological elevation of renin (ie, renovascular hypertension) to increase circulatory Ang II in humans ultimately lead to hypertension and end organ damage. In addition to hypertension, accumulating evidence supports that the Ang II type 1 receptor exerts a critical role in cardiovascular and kidney diseases independent of blood pressure elevation. In the past 2 decades, the identification of an increased number of peptides and receptors has facilitated the concept that the RAS has detrimental and beneficial effects on the cardiovascular system depending on which RAS components are activated. For example, angiotensin 1-7 and Ang II type 2 receptors act as a counter-regulatory system against the classical RAS by mediating vasodilation. Although the RAS as an endocrine system for regulation of blood pressure is well established, there remain many unanswered questions and controversial findings regarding blood pressure regulation and pathophysiological regulation of cardiovascular diseases at the tissue level. This review article includes the latest knowledge gleaned from cell type-selective gene deleted mice regarding cell type-specific roles of Ang II receptors and their significance in health and diseases are discussed. In particular, we focus on the roles of these receptors expressed in vascular, cardiac, and kidney epithelial cells.
Collapse
Affiliation(s)
- Satoru Eguchi
- Sol Sherry Thrombosis Research Center, Lewis Katz School of Medicine at Temple University, Philadelphia, Pennsylvania, USA.
| | - Matthew A Sparks
- Division of Nephrology, Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA; Renal Section, Durham VA Medical Center, Durham, North Carolina, USA
| | - Hisashi Sawada
- Department of Physiology, Saha Cardiovascular Center, and Saha Aortic Center, University of Kentucky College of Medicine, Lexington, Kentucky, USA
| | - Hong S Lu
- Department of Physiology, Saha Cardiovascular Center, and Saha Aortic Center, University of Kentucky College of Medicine, Lexington, Kentucky, USA
| | - Alan Daugherty
- Department of Physiology, Saha Cardiovascular Center, and Saha Aortic Center, University of Kentucky College of Medicine, Lexington, Kentucky, USA
| | - Jia L Zhuo
- Tulane Hypertension and Renal Center of Excellence and Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana, USA
| |
Collapse
|
2
|
Xu C, Yi X, Tang L, Wang H, Chu S, Yu J. Differential regulation of autophagy on urine-concentrating capability through modulating the renal AQP2 expression and renin-angiotensin system in mice. Am J Physiol Renal Physiol 2023; 325:F503-F518. [PMID: 37589054 DOI: 10.1152/ajprenal.00018.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 08/02/2023] [Accepted: 08/07/2023] [Indexed: 08/18/2023] Open
Abstract
Autophagy, a cellular process of "self-eating," plays an essential role in renal pathophysiology. However, the effect of autophagy on urine-concentrating ability in physiological conditions is still unknown. This study aimed to determine the relevance and mechanisms of autophagy for maintaining urine-concentrating capability during antidiuresis. The extent of the autophagic response to water deprivation (WD) was different between the renal cortex and medulla in mice. Autophagy activity levels in the renal cortex were initially suppressed and then stimulated by WD in a time-dependent manner. During 48 h WD, the urine-concentrating capability of mice was impaired by rapamycin (Rapa) but not by 3-methyladenine (3-MA), accompanied by suppressed renal aquaporin 2 (AQP2), V2 receptor (V2R), renin, and angiotensin-converting enzyme (ACE) expression, and levels of prorenin/renin, angiotensin II (ANG II), and aldosterone in the plasma and urine. In contrast, 3-MA and chloroquine (CQ) suppressed the urine-concentrating capability in WD72 mice, accompanied by downregulation of AQP2 and V2R expression in the renal cortex. 3-MA and CQ further increased AQP2 and V2R expression in the renal medulla of WD72 mice. Compared with 3-MA and CQ, Rapa administration yielded completely opposite results on the above parameters in WD72 mice. In addition, 3-MA and CQ abolished the upregulation of prorenin/renin, ANG II, and aldosterone levels in the plasma and urine in WD72 mice. Taken together, our study demonstrated that autophagy regulated urine-concentrating capability through differential regulation of renal AQP2/V2R and ACE/ANG II signaling during WD.NEW & NOTEWORTHY Autophagy exhibits a double-edged effect on cell survival and plays an essential role in renal pathophysiology. We for the first time reported a novel function of autophagy that controls the urine-concentrating capability in physiological conditions. We found that water deprivation (WD) differentially regulated autophagy in the kidneys of mice in a time-dependent manner and autophagy regulates the urine-concentrating capability mainly by regulating AQP2/V2R and ACE/ANG II signaling in the renal cortex in WD mice.
Collapse
Affiliation(s)
- Chuanming Xu
- Translational Medicine Centre, Jiangxi University of Chinese Medicine, Nanchang, People's Republic of China
| | - Xiaoli Yi
- Translational Medicine Centre, Jiangxi University of Chinese Medicine, Nanchang, People's Republic of China
| | - Le Tang
- Translational Medicine Centre, Jiangxi University of Chinese Medicine, Nanchang, People's Republic of China
| | - Hui Wang
- Translational Medicine Centre, Jiangxi University of Chinese Medicine, Nanchang, People's Republic of China
| | - Shuhan Chu
- Translational Medicine Centre, Jiangxi University of Chinese Medicine, Nanchang, People's Republic of China
| | - Jun Yu
- Center for Metabolic Disease Research and Department of Cardiovascular Sciences, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania, United States
| |
Collapse
|
3
|
Chen Y, Xu C, Hu J, Deng M, Qiu Q, Mo S, Du Y, Yang T. Diuretic Action of Apelin-13 Mediated by Inhibiting cAMP/PKA/sPRR Pathway. Front Physiol 2021; 12:642274. [PMID: 33868005 PMCID: PMC8044521 DOI: 10.3389/fphys.2021.642274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 03/03/2021] [Indexed: 11/13/2022] Open
Abstract
Emerging evidence is showing that apelin plays an important role in regulating salt and water balance by counteracting the antidiuretic action of vasopressin (AVP). However, the underlying mechanism remains unknown. Here, we hypothesized that (pro) renin receptor (PRR)/soluble prorenin receptor (sPRR) might mediate the diuretic action of apelin in the distal nephron. During water deprivation (WD), the urine concentrating capability was impaired by an apelin peptide, apelin-13, accompanied by the suppression of the protein expression of aquaporin 2 (AQP2), NKCC2, PRR/sPRR, renin and nuclear β-catenin levels in the kidney. The upregulated expression of AQP2 or PRR/sPRR both induced by AVP and 8-Br-cAMP was blocked by apelin-13, PKA inhibitor (H89), or β-catenin inhibitor (ICG001). Interestingly, the blockage of apelin-13 on AVP-induced AQP2 protein expression was reversed by exogenous sPRR. Together, the present study has defined the cyclic adenosine monophosphate (cAMP)/protein kinase A (PKA)/sPRR pathway in the CD as the molecular target of the diuretic action of apelin.
Collapse
Affiliation(s)
- Yanting Chen
- Zhongshan School of Medicine, Institute of Hypertension, Sun Yat-sen University, Guangzhou, China
| | - Chuanming Xu
- Zhongshan School of Medicine, Institute of Hypertension, Sun Yat-sen University, Guangzhou, China.,Center for Translational Medicine, Jiangxi University of Traditional Chinese, Nanchang, China
| | - Jiajia Hu
- Zhongshan School of Medicine, Institute of Hypertension, Sun Yat-sen University, Guangzhou, China
| | - Mokan Deng
- Zhongshan School of Medicine, Institute of Hypertension, Sun Yat-sen University, Guangzhou, China
| | - Qixiang Qiu
- Zhongshan School of Medicine, Institute of Hypertension, Sun Yat-sen University, Guangzhou, China
| | - Shiqi Mo
- Zhongshan School of Medicine, Institute of Hypertension, Sun Yat-sen University, Guangzhou, China
| | - Yanhua Du
- Department of Pharmacology, Sun Yat-sen University School of Medicine, Guangzhou, China
| | - Tianxin Yang
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, UT, United States
| |
Collapse
|
4
|
Renin-angiotensin system in mammalian kidney development. Pediatr Nephrol 2021; 36:479-489. [PMID: 32072306 DOI: 10.1007/s00467-020-04496-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 01/30/2020] [Accepted: 01/31/2020] [Indexed: 12/20/2022]
Abstract
Mutations in the genes of the renin-angiotensin system result in congenital anomalies of the kidney and urinary tract (CAKUT), the main cause of end-stage renal disease in children. The molecular mechanisms that cause CAKUT are unclear in most cases. To improve the care of children with CAKUT, it is critical to determine the underlying mechanisms of CAKUT. In this review, we discuss recent advances that have helped to better understand how disruption of the renin-angiotensin system during kidney development contributes to CAKUT.
Collapse
|
5
|
Muhanna D, Arnipalli SR, Kumar SB, Ziouzenkova O. Osmotic Adaptation by Na +-Dependent Transporters and ACE2: Correlation with Hemostatic Crisis in COVID-19. Biomedicines 2020; 8:E460. [PMID: 33142989 PMCID: PMC7693583 DOI: 10.3390/biomedicines8110460] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 01/08/2023] Open
Abstract
COVID-19 symptoms, including hypokalemia, hypoalbuminemia, ageusia, neurological dysfunctions, D-dimer production, and multi-organ microthrombosis reach beyond effects attributed to impaired angiotensin-converting enzyme 2 (ACE2) signaling and elevated concentrations of angiotensin II (Ang II). Although both SARS-CoV (Severe Acute Respiratory Syndrome Coronavirus) and SARS-CoV-2 utilize ACE2 for host entry, distinct COVID-19 pathogenesis coincides with the acquisition of a new sequence, which is homologous to the furin cleavage site of the human epithelial Na+ channel (ENaC). This review provides a comprehensive summary of the role of ACE2 in the assembly of Na+-dependent transporters of glucose, imino and neutral amino acids, as well as the functions of ENaC. Data support an osmotic adaptation mechanism in which osmotic and hemostatic instability induced by Ang II-activated ENaC is counterbalanced by an influx of organic osmolytes and Na+ through the ACE2 complex. We propose a paradigm for the two-site attack of SARS-CoV-2 leading to ENaC hyperactivation and inactivation of the ACE2 complex, which collapses cell osmolality and leads to rupture and/or necrotic death of swollen pulmonary, endothelial, and cardiac cells, thrombosis in infected and non-infected tissues, and aberrant sensory and neurological perception in COVID-19 patients. This dual mechanism employed by SARS-CoV-2 calls for combinatorial treatment strategies to address and prevent severe complications of COVID-19.
Collapse
Affiliation(s)
| | | | | | - Ouliana Ziouzenkova
- Department of Human Sciences, The Ohio State University, Columbus, OH 43210, USA; (D.M.); (S.R.A.); (S.B.K.)
| |
Collapse
|
6
|
Fähling M, Paliege A, Jönsson S, Becirovic-Agic M, Melville JM, Skogstrand T, Hultström M. NFAT5 regulates renal gene expression in response to angiotensin II through Annexin-A2-mediated posttranscriptional regulation in hypertensive rats. Am J Physiol Renal Physiol 2018; 316:F101-F112. [PMID: 30332317 DOI: 10.1152/ajprenal.00361.2018] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
The aim was to identify new targets that regulate gene expression at the posttranscriptional level in angiotensin II (ANGII)-mediated hypertension. Heparin affinity chromatography was used to enrich nucleic acid-binding proteins from kidneys of two-kidney, one-clip (2K1C) hypertensive Wistar rats. The experiment was repeated with 14-day ANGII infusion using Alzet osmotic mini pumps, with or without ANGII receptor AT1a inhibition using losartan in the drinking water. Mean arterial pressure increased after 2K1C or ANGII infusion and was inhibited with losartan. Heparin affinity chromatography and mass spectrometry were used to identify Annexin-A2 (ANXA2) as having differential nucleic acid-binding activity. Total Annexin-A2 protein expression was unchanged, whereas nucleic acid-binding activity was increased in both kidneys of 2K1C and after ANGII infusion through AT1a stimulation. Costaining of Annexin-A2 with α-smooth muscle actin and aquaporin 2 showed prominent expression in the endothelia of larger arteries and the cells of the inner medullary collecting duct. The nuclear factor of activated T cells (NFAT) transcription factor was identified as a likely Annexin-A2 target using enrichment analysis on a 2K1C microarray data set and identifying several binding sites in the regulatory region of the mRNA. Expression analysis showed that ANGII increases NFAT5 protein but not mRNA level and, thus, indicated that NFAT5 is regulated by posttranscriptional regulation, which correlates with activation of the RNA-binding protein Annexin-A2. In conclusion, we show that ANGII increases Annexin-A2 nucleic acid-binding activity that correlates with elevated protein levels of the NFAT5 transcription factor. NFAT signaling appears to be a major contributor to renal gene regulation in high-renin states.
Collapse
Affiliation(s)
- Michael Fähling
- Institut für Vegetative Physiologie, Charité, Universitätsmedizin, Berlin , Germany
| | - Alexander Paliege
- Institut für Anatomie, Charité, Universitätsmedizin, Berlin , Germany
| | - Sofia Jönsson
- Integrative Physiology, Department of Medical Cell Biology, Uppsala University , Uppsala , Sweden
| | - Mediha Becirovic-Agic
- Integrative Physiology, Department of Medical Cell Biology, Uppsala University , Uppsala , Sweden
| | - Jacqueline M Melville
- Integrative Physiology, Department of Medical Cell Biology, Uppsala University , Uppsala , Sweden
| | - Trude Skogstrand
- Department of Biomedicine, University of Bergen , Bergen , Norway
| | - Michael Hultström
- Integrative Physiology, Department of Medical Cell Biology, Uppsala University , Uppsala , Sweden.,Anaesthesiology and Intensive Care Medicine, Department of Surgical Sciences, Uppsala University , Uppsala , Sweden
| |
Collapse
|
7
|
Kandel C, Schmidt P, Perniss A, Keshavarz M, Scholz P, Osterloh S, Althaus M, Kummer W, Deckmann K. ENaC in Cholinergic Brush Cells. Front Cell Dev Biol 2018; 6:89. [PMID: 30159312 PMCID: PMC6103785 DOI: 10.3389/fcell.2018.00089] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Accepted: 07/25/2018] [Indexed: 12/17/2022] Open
Abstract
Cholinergic polymodal chemosensory cells in the mammalian urethra (urethral brush cells = UBC) functionally express the canonical bitter and umami taste transduction signaling cascade. Here, we aimed to determine whether UBC are functionally equipped for the perception of salt through ENaC (epithelial sodium channel). Cholinergic UBC were isolated from ChAT-eGFP reporter mice (ChAT = choline acetyltransferase). RT-PCR showed mRNA expression of ENaC subunits Scnn1a, Scnn1b, and Scnn1g in urethral epithelium and isolated UBC. Scnn1a could also be detected by next generation sequencing in 4/6 (66%) single UBC, two of them also expressed the bitter receptor Tas2R108. Strong expression of Scnn1a was seen in some urothelial umbrella cells and in 65% of UBC (30/46 cells) in a Scnn1a reporter mouse strain. Intracellular [Ca2+] was recorded in isolated UBC stimulated with the bitter substance denatonium benzoate (25 mM), ATP (0.5 mM) and NaCl (50 mM, on top of 145 mM Na+ and 153 mM Cl− baseline in buffer); mannitol (150 mM) served as osmolarity control. NaCl, but not mannitol, evoked an increase in intracellular [Ca2+] in 70% of the tested UBC. The NaCl-induced effect was blocked by the ENaC inhibitor amiloride (IC50 = 0.47 μM). When responses to both NaCl and denatonium were tested, all three possible positive response patterns occurred in a balanced distribution: 42% NaCl only, 33% denatonium only, 25% to both stimuli. A similar reaction pattern was observed with ATP and NaCl as test stimuli. About 22% of the UBC reacted to all three stimuli. Thus, NaCl evokes calcium responses in several UBC, likely involving an amiloride-sensitive channel containing α-ENaC. This feature does not define a new subpopulation of UBC, but rather emphasizes their polymodal character. The actual function of α-ENaC in cholinergic UBC—salt perception, homeostatic ion transport, mechanoreception—remains to be determined.
Collapse
Affiliation(s)
- Chrissy Kandel
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Patricia Schmidt
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Alexander Perniss
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Maryam Keshavarz
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Paul Scholz
- Department of Cell Physiology, Ruhr-University Bochum, Bochum, Germany
| | - Sabrina Osterloh
- Department of Cell Physiology, Ruhr-University Bochum, Bochum, Germany
| | - Mike Althaus
- School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - Wolfgang Kummer
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| | - Klaus Deckmann
- Institute for Anatomy and Cell Biology, Justus-Liebig-University Giessen, Giessen, Germany
| |
Collapse
|
8
|
Yang KT, Yang T, Symons JD. Soluble (pro)renin receptor as a potential therapy for diabetes insipidus. Am J Physiol Renal Physiol 2018; 315:F1416-F1421. [PMID: 30019932 DOI: 10.1152/ajprenal.00266.2018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The antidiuretic hormone vasopressin (VP) is produced by the hypothalamus and is stored and secreted from the posterior pituitary. VP acts via VP type 2 receptors (V2Rs) on the basolateral membrane of principal cells of the collecting duct (CD) to regulate fluid permeability. The VP-evoked endocrine pathway is essential in determining urine concentrating capability. For example, a defect in any component of the VP signaling pathway can result in polyuria, polydipsia, and hypotonic urine, collectively termed diabetes insipidus (DI). A lack of VP production precipitates central diabetes insipidus (CDI), which can be managed effectively by VP supplementation. A majority of cases of nephrogenic diabetes insipidus (NDI) result from V2R mutations that impair receptor sensitivity. No specific therapy is currently available for management of NDI. Evidence is evolving that (pro)renin receptor (PRR), a newly identified member of the renin-angiotensin system, is capable of regulating VP production and action. As such, PRR should be considered strongly as a therapeutic target for treating CDI and NDI. The current review will summarize recent advances in understanding the physiology of renal and central PRR as it relates to the two types of DI.
Collapse
Affiliation(s)
- Kevin T Yang
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,College of Health, University of Utah , Salt Lake City, Utah.,Molecular Medicine Program, University of Utah , Salt Lake City, Utah
| | - Tianxin Yang
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,Research Service, Veterans Affairs Medical Center , Salt Lake City, Utah.,Institute of Hypertension, Sun Yat-sen University Zhongshan School of Medicine , Guangzhou , China
| | - J David Symons
- Department of Internal Medicine, University of Utah , Salt Lake City, Utah.,College of Health, University of Utah , Salt Lake City, Utah.,Molecular Medicine Program, University of Utah , Salt Lake City, Utah
| |
Collapse
|
9
|
Zimnol A, Amann K, Mandel P, Hartmann C, Schupp N. Angiotensin II type 1a receptor-deficient mice develop angiotensin II-induced oxidative stress and DNA damage without blood pressure increase. Am J Physiol Renal Physiol 2017; 313:F1264-F1273. [PMID: 28877878 DOI: 10.1152/ajprenal.00183.2017] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 08/04/2017] [Accepted: 08/29/2017] [Indexed: 11/22/2022] Open
Abstract
Hypertensive patients have an increased risk of developing kidney cancer. We have shown in vivo that besides elevating blood pressure, angiotensin II causes DNA damage dose dependently. Here, the role of blood pressure in the formation of DNA damage is studied. Mice lacking one of the two murine angiotensin II type 1 receptor (AT1R) subtypes, AT1aR, were equipped with osmotic minipumps, delivering angiotensin II during 28 days. Parameters of oxidative stress and DNA damage of kidneys and hearts of AT1aR-knockout mice were compared with wild-type (C57BL/6) mice receiving angiotensin II, and additionally, with wild-type mice treated with candesartan, an antagonist of both AT1R subtypes. In wild-type mice, angiotensin II induced hypertension, reduced kidney function, and led to a significant formation of reactive oxygen species (ROS). Furthermore, genomic damage was markedly increased in this group. All these responses to angiotensin II could be attenuated by concurrent administration of candesartan. In AT1aR-deficient mice treated with angiotensin II, systolic pressure was not increased, and renal function was not affected. However, angiotensin II still led to an increase of ROS in kidneys and hearts of these animals. Additionally, genomic damage in the form of double-strand breaks was significantly induced in kidneys of AT1aR-deficient mice. Our results show that angiotensin II induced ROS production and DNA damage even without the presence of AT1aR and independently of blood pressure changes.
Collapse
Affiliation(s)
- Anna Zimnol
- Institute of Toxicology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany; and
| | - Kerstin Amann
- Department of Nephropathology, Institute of Pathology, University of Erlangen-Nürnberg, Erlangen, Germany
| | - Philipp Mandel
- Institute of Toxicology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany; and
| | - Christina Hartmann
- Institute of Toxicology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany; and
| | - Nicole Schupp
- Institute of Toxicology, Medical Faculty, University of Düsseldorf, Düsseldorf, Germany; and
| |
Collapse
|
10
|
Li J, Hatano R, Xu S, Wan L, Yang L, Weinstein AM, Palmer L, Wang T. Gender difference in kidney electrolyte transport. I. Role of AT 1a receptor in thiazide-sensitive Na +-Cl - cotransporter activity and expression in male and female mice. Am J Physiol Renal Physiol 2017; 313:F505-F513. [PMID: 28566500 DOI: 10.1152/ajprenal.00087.2017] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 05/11/2017] [Accepted: 05/30/2017] [Indexed: 11/22/2022] Open
Abstract
We studied gender differences in Na+-Cl- cotransporter (NCC) activity and expression in wild-type (WT) and AT1a receptor knockout (KO) mice. In renal clearance experiments, urine volume (UV), glomerular filtration rate, absolute Na+ (ENa) and K+ (EK), and fractional Na+ (FENa) and K+ excretion were measured and compared at peak changes after bolus intravenous injection of hydrochlorothiazide (HCTZ; 30 mg/kg). In WT, females responded more strongly than males to HCTZ, with larger fractional increases of UV (7.8- vs. 3.4-fold), ENa (11.7- vs. 5.7-fold), FENa (7.9- vs. 4.9-fold), and EK (2.8- vs. 1.4-fold). In contrast, there were no gender differences in the responses to the diuretic in KO mice; HCTZ produced greater effects on male KO than on WT but similar effects on females. In WT, total (tNCC) and phosphorylated (pNCC) NCC protein expressions were 1.8- and 4.6-fold higher in females compared with males (P < 0.05), consistent with the larger response to HCTZ. In KO mice, tNCC and pNCC increased significantly in males to levels not different from those in females. There were no gender differences in the expression of the Na+/H+ exchanger (NHE3) in WT; NHE3 protein decreased to similar extents in male and female KO animals, suggesting AT1a-mediated NHE3 expression in proximal tubules. The resulting increase in delivery of NaCl to the distal nephron may underlie increased NCC expression and activity in mice lacking the AT1a receptor.
Collapse
Affiliation(s)
- Jing Li
- Department of Cellular and Molecular Physiology, Yale University, New Haven, Connecticut.,Department of Basic Medical Science, Chengdu Medical College, Chengdu, China
| | - Ryo Hatano
- Department of Cellular and Molecular Physiology, Yale University, New Haven, Connecticut
| | - Shuhua Xu
- Department of Cellular and Molecular Physiology, Yale University, New Haven, Connecticut
| | - Laxiang Wan
- Department of Cellular and Molecular Physiology, Yale University, New Haven, Connecticut
| | - Lei Yang
- Department of Physiology and Biophysics, Weill Medical College of Cornell University, Ithaca, New York; and
| | - Alan M Weinstein
- Department of Physiology and Biophysics, Weill Medical College of Cornell University, Ithaca, New York; and
| | - Lawrence Palmer
- Department of Physiology and Biophysics, Weill Medical College of Cornell University, Ithaca, New York; and
| | - Tong Wang
- Department of Cellular and Molecular Physiology, Yale University, New Haven, Connecticut;
| |
Collapse
|
11
|
Wang F, Lu X, Peng K, Fang H, Zhou L, Su J, Nau A, Yang KT, Ichihara A, Lu A, Zhou SF, Yang T. Antidiuretic Action of Collecting Duct (Pro)Renin Receptor Downstream of Vasopressin and PGE2 Receptor EP4. J Am Soc Nephrol 2016; 27:3022-3034. [PMID: 27000064 DOI: 10.1681/asn.2015050592] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 01/24/2016] [Indexed: 12/30/2022] Open
Abstract
Within the kidney, the (pro)renin receptor (PRR) is predominantly expressed in the collecting duct (CD), particularly in intercalated cells, and it is regulated by the PGE2 receptor EP4 Notably, EP4 also controls urinary concentration through regulation of aquaporin 2 (AQP2). Here, we tested the hypothesis that sequential activation of EP4 and PRR determines AQP2 expression in the CD, thus mediating the antidiuretic action of vasopressin (AVP). Water deprivation (WD) elevated renal PRR expression and urinary soluble PRR excretion in rats. Intrarenal infusion of a PRR decoy peptide, PRO20, or an EP4 antagonist partially prevented the decrease in urine volume and the increase in urine osmolality and AQP2 expression induced by 48-hour WD. In primary cultures of rat inner medullary CD cells, AQP2 expression induced by AVP treatment for 24 hours depended on sequential activation of the EP4 receptor and PRR. Additionally, mice lacking PRR in the CD exhibited increased urine volume and decreased urine osmolality under basal conditions and impaired urine concentrating capability accompanied by severe volume loss and a dangerous level of plasma hyperosmolality after WD. Together, these results suggest a previously undescribed linear AVP/PGE2/EP4/PRR pathway in the CD for regulation of AQP2 expression and urine concentrating capability.
Collapse
Affiliation(s)
- Fei Wang
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China; Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Xiaohan Lu
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Kexin Peng
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Hui Fang
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Li Zhou
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Jiahui Su
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Adam Nau
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Kevin T Yang
- Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah
| | - Atsuhiro Ichihara
- Department of Medicine II, Endocrinology and Hypertension, Tokyo Women's Medical University, Tokyo, Japan; and
| | - Aihua Lu
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China
| | - Shu-Feng Zhou
- Department of Pharmaceutical Sciences, College of Pharmacy, University of South Florida, Tampa, Florida
| | - Tianxin Yang
- Institute of Hypertension, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, China; Department of Internal Medicine, University of Utah and Veterans Affairs Medical Center, Salt Lake City, Utah;
| |
Collapse
|
12
|
Li XC, Shull GE, Miguel-Qin E, Chen F, Zhuo JL. Role of the Na+/H+ exchanger 3 in angiotensin II-induced hypertension in NHE3-deficient mice with transgenic rescue of NHE3 in small intestines. Physiol Rep 2015; 3:3/11/e12605. [PMID: 26564064 PMCID: PMC4673635 DOI: 10.14814/phy2.12605] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The role of Na(+/)H(+) exchanger 3 (NHE3) in the kidney in angiotensin II (ANG II)-induced hypertension remains unknown. The present study used global NHE3-deficient mice with transgenic rescue of the Nhe3 gene in small intestines (tgNhe3(-/-)) to test the hypothesis that genetic deletion of NHE3 selectively in the kidney attenuates ANG II-induced hypertension. Six groups of wild-type (tgNhe3(+/+)) and tgNhe3(-/-) mice were infused with either vehicle or ANG II (1.5 mg/kg/day, i.p., 2 weeks, or 10 nmol/min, i.v., 30 min), treated with or without losartan (20 mg/kg/day, p.o.) for 2 weeks. Basal systolic blood pressure (SBP) and mean intra-arterial blood pressure (MAP) were significantly lower in tgNhe3(-/-) mice (P < 0.01). Basal glomerular filtration rate, 24 h urine excretion, urinary Na(+) excretion, urinary K(+) excretion, and urinary Cl(-) excretion were significantly lower in tgNhe3(-/-) mice (P < 0.01). These responses were associated with significantly elevated plasma ANG II and aldosterone levels, and marked upregulation in aquaporin 1, the Na(+)/HCO3 cotransporter, the α1 subunit isoform of Na(+)/K(+)-ATPase, protein kinase Cα, MAP kinases ERK1/2, and glycogen synthase kinase 3 α/β in the renal cortex of tgNhe3(-/-) mice (P < 0.01). ANG II infusion markedly increased SBP and MAP and renal cortical transporter and signaling proteins in tgNhe3(+/+), as expected, but all of these responses to ANG II were attenuated in tgNhe3(-/-) mice (P < 0.01). These results suggest that NHE3 in the kidney is necessary for maintaining normal blood pressure and fully developing ANG II-dependent hypertension.
Collapse
Affiliation(s)
- Xiao C Li
- Laboratory of Receptor and Signal Transduction, Department of Pharmacology and Toxicology, Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Gary E Shull
- Department of Molecular Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| | - Elisa Miguel-Qin
- Laboratory of Receptor and Signal Transduction, Department of Pharmacology and Toxicology, Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Fang Chen
- Laboratory of Receptor and Signal Transduction, Department of Pharmacology and Toxicology, Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi
| | - Jia L Zhuo
- Laboratory of Receptor and Signal Transduction, Department of Pharmacology and Toxicology, Division of Nephrology, Department of Medicine, University of Mississippi Medical Center, Jackson, Mississippi Department of Molecular Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio
| |
Collapse
|
13
|
Walch JD, Nedungadi TP, Cunningham JT. ANG II receptor subtype 1a gene knockdown in the subfornical organ prevents increased drinking behavior in bile duct-ligated rats. Am J Physiol Regul Integr Comp Physiol 2014; 307:R597-607. [PMID: 25009217 DOI: 10.1152/ajpregu.00163.2014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Bile duct ligation (BDL) causes congestive liver failure that initiates hemodynamic changes, resulting in dilutional hyponatremia due to increased water intake and vasopressin release. This project tested the hypothesis that angiotensin signaling at the subfornical organ (SFO) augments drinking behavior in BDL rats. A genetically modified adeno-associated virus containing short hairpin RNA (shRNA) for ANG II receptor subtype 1a (AT1aR) gene was microinjected into the SFO of rats to knock down expression. Two weeks later, BDL or sham surgery was performed. Rats were housed in metabolic chambers for measurement of fluid and food intake and urine output. The rats were euthanized 28 days after BDL surgery for analysis. A group of rats was perfused for immunohistochemistry, and a second group was used for laser-capture microdissection for analysis of SFO AT1aR gene expression. BDL rats showed increased water intake that was attenuated in rats that received SFO microinjection of AT1aR shRNA. Among BDL rats treated with scrambled (control) and AT1aR shRNA, we observed an increased number of vasopressin-positive cells in the supraoptic nucleus that colocalized with ΔFosB staining, suggesting increased vasopressin release in both groups. These results indicate that angiotensin signaling through the SFO contributes to increased water intake, but not dilutional hyponatremia, during congestive liver failure.
Collapse
Affiliation(s)
- Joseph D Walch
- Department of Integrative Physiology and Anatomy and the Cardiovascular Research Institute, University of North Texas Health Science Centre at Fort Worth, Fort Worth, Texas; and Department of Pharmacology and Neuroscience, University of Texas Health Science Center at San Antonio, San Antonio, Texas
| | - T Prashant Nedungadi
- Department of Integrative Physiology and Anatomy and the Cardiovascular Research Institute, University of North Texas Health Science Centre at Fort Worth, Fort Worth, Texas; and
| | - J Thomas Cunningham
- Department of Integrative Physiology and Anatomy and the Cardiovascular Research Institute, University of North Texas Health Science Centre at Fort Worth, Fort Worth, Texas; and
| |
Collapse
|
14
|
Yosypiv IV. Renin-angiotensin system in ureteric bud branching morphogenesis: implications for kidney disease. Pediatr Nephrol 2014; 29:609-20. [PMID: 24061643 DOI: 10.1007/s00467-013-2616-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2013] [Revised: 08/20/2013] [Accepted: 08/21/2013] [Indexed: 12/26/2022]
Abstract
Failure of normal branching morphogenesis of the ureteric bud (UB), a key ontogenic process that controls organogenesis of the metanephric kidney, leads to congenital anomalies of the kidney and urinary tract (CAKUT), the leading cause of end-stage kidney disease in children. Recent studies have revealed a central role of the renin-angiotensin system (RAS), the cardinal regulator of blood pressure and fluid/electrolyte homeostasis, in the control of normal kidney development. Mice or humans with mutations in the RAS genes exhibit a spectrum of CAKUT which includes renal medullary hypoplasia, hydronephrosis, renal hypodysplasia, duplicated renal collecting system and renal tubular dysgenesis. Emerging evidence indicates that severe hypoplasia of the inner medulla and papilla observed in angiotensinogen (Agt)- or angiotensin (Ang) II AT 1 receptor (AT 1 R)-deficient mice is due to aberrant UB branching morphogenesis resulting from disrupted RAS signaling. Lack of the prorenin receptor (PRR) in the UB in mice causes reduced UB branching, resulting in decreased nephron endowment, marked kidney hypoplasia, urinary concentrating and acidification defects. This review provides a mechanistic rational supporting the hypothesis that aberrant signaling of the intrarenal RAS during distinct stages of metanephric kidney development contributes to the pathogenesis of the broad phenotypic spectrum of CAKUT. As aberrant RAS signaling impairs normal renal development, these findings advocate caution for the use of RAS inhibitors in early infancy and further underscore a need to avoid their use during pregnancy and to identify the types of molecular processes that can be targeted for clinical intervention.
Collapse
Affiliation(s)
- Ihor V Yosypiv
- Section of Pediatric Nephrology, Department of Pediatrics, Hypertension and Renal Center of Excellence, Tulane University Health Sciences Center, 1430 Tulane Avenue, New Orleans, LA, 70112, USA,
| |
Collapse
|
15
|
Kittikulsuth W, Stuart D, Van Hoek AN, Stockand JD, Bugaj V, Mironova E, Blount MA, Kohan DE. Lack of an effect of collecting duct-specific deletion of adenylyl cyclase 3 on renal Na+ and water excretion or arterial pressure. Am J Physiol Renal Physiol 2014; 306:F597-607. [PMID: 24431204 DOI: 10.1152/ajprenal.00505.2013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
cAMP is a key mediator of connecting tubule and collecting duct (CD) Na(+) and water reabsorption. Studies performed in vitro have suggested that CD adenylyl cyclase (AC)3 partly mediates the actions of vasopressin; however, the physiological role of CD AC3 has not been determined. To assess this, mice were developed with CD-specific disruption of AC3 [CD AC3 knockout (KO)]. Inner medullary CDs from these mice exhibited 100% target gene recombination and had reduced ANG II- but not vasopressin-induced cAMP accumulation. However, there were no differences in urine volume, urinary urea excretion, or urine osmolality between KO and control mice during normal water intake or varying degrees of water restriction in the presence or absence of chronic vasopressin administration. There were no differences between CD AC3 KO and control mice in arterial pressure or urinary Na(+) or K(+) excretion during a normal or high-salt diet, whereas plasma renin and vasopressin concentrations were similar between the two genotypes. Patch-clamp analysis of split-open cortical CDs revealed no difference in epithelial Na(+) channel activity in the presence or absence of vasopressin. Compensatory changes in AC6 were not responsible for the lack of a renal phenotype in CD AC3 KO mice since combined CD AC3/AC6 KO mice had similar arterial pressure and renal Na(+) and water handling compared with CD AC6 KO mice. In summary, these data do not support a significant role for CD AC3 in the regulation of renal Na(+) and water excretion in general or vasopressin regulation of CD function in particular.
Collapse
Affiliation(s)
- Wararat Kittikulsuth
- Div. of Nephrology, Univ. of Utah Health Sciences Center, 1900 East 30 North, Salt Lake City, UT 84132.
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Dietrich A, Mathia S, Kaminski H, Mutig K, Rosenberger C, Mrowka R, Bachmann S, Paliege A. Chronic activation of vasopressin V2 receptor signalling lowers renal medullary oxygen levels in rats. Acta Physiol (Oxf) 2013; 207:721-31. [PMID: 23347696 DOI: 10.1111/apha.12067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2012] [Revised: 12/27/2012] [Accepted: 01/17/2013] [Indexed: 12/17/2022]
Abstract
AIM In the present study, we aimed to elucidate the effects of chronic vasopressin administration on renal medullary oxygen levels. METHODS Adult Sprague Dawley or vasopressin-deficient Brattleboro rats were treated with the vasopressin V2 receptor agonist, desmopressin (5 ng/h; 3d), or its vehicle via osmotic minipumps. Immunostaining for pimonidazole and the transcription factor HIF-1α (hypoxia-inducible factor-1α) were used to identify hypoxic areas. Activation of HIF-target gene expression following desmopressin treatment was studied by microarray analysis. RESULTS Pimonidazole staining was detected in the outer and inner medulla of desmopressin-treated rats, whereas staining in control animals was weak or absent. HIF-1α immunostaining demonstrated nuclear accumulation in the papilla of desmopressin-treated animals, whereas no staining was observed in the controls. Gene expression analysis revealed significant enrichment of HIF-target genes in the group of desmopressin-regulated gene products (P = 2.6*10(-21) ). Regulated products included insulin-like growth factor binding proteins 1 and 3, angiopoietin 2, fibronectin, cathepsin D, hexokinase 2 and cyclooxygenase 2. CONCLUSION Our results demonstrate that an activation of the renal urine concentrating mechanism by desmopressin causes renal medullary hypoxia and an upregulation of hypoxia-inducible gene expression.
Collapse
Affiliation(s)
- A. Dietrich
- Department of Anatomy; Charité-Universitätsmedizin Berlin; Berlin; Germany
| | - S. Mathia
- Department of Nephrology; Charité-Universitätsmedizin Berlin; Berlin; Germany
| | - H. Kaminski
- Department of Anatomy; Charité-Universitätsmedizin Berlin; Berlin; Germany
| | - K. Mutig
- Department of Anatomy; Charité-Universitätsmedizin Berlin; Berlin; Germany
| | - C. Rosenberger
- Department of Nephrology; Charité-Universitätsmedizin Berlin; Berlin; Germany
| | - R. Mrowka
- Experimentelle Nephrologie; KIM III; Universitästsklinikum Jena; Jena; Germany
| | - S. Bachmann
- Department of Anatomy; Charité-Universitätsmedizin Berlin; Berlin; Germany
| | | |
Collapse
|