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Mathieu NM, Tan EE, Reho JJ, Brozoski DT, Muskus PC, Lu KT, Wackman KK, Grobe JL, Nakagawa P, Sigmund CD. Genetic Deletion of β-Arrestin 2 From the Subfornical Organ and Other Periventricular Nuclei in the Brain Alters Fluid Homeostasis and Blood Pressure. Hypertension 2024; 81:1332-1344. [PMID: 38629290 PMCID: PMC11096025 DOI: 10.1161/hypertensionaha.124.22874] [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: 02/08/2024] [Accepted: 04/07/2024] [Indexed: 05/18/2024]
Abstract
BACKGROUND ANG (angiotensin II) elicits dipsogenic and pressor responses via activation of the canonical Gαq (G-protein component of the AT1R [angiotensin type 1 receptor])-mediated AT1R in the subfornical organ. Recently, we demonstrated that ARRB2 (β-arrestin 2) global knockout mice exhibit a higher preference for salt and exacerbated pressor response to deoxycorticosterone acetate salt. However, whether ARRB2 within selective neuroanatomical nuclei alters physiological responses to ANG is unknown. Therefore, we hypothesized that ARRB2, specifically in the subfornical organ, counterbalances maladaptive dipsogenic and pressor responses to the canonical AT1R signaling. METHODS Male and female Arrb2FLOX mice received intracerebroventricular injection of either adeno-associated virus (AAV)-Cre-GFP (green fluorescent protein) to induce brain-specific deletion of ARRB2 (Arrb2ICV-Cre). Arrb2FLOX mice receiving ICV-AAV-GFP were used as control (Arrb2ICV-Control). Infection with ICV-AAV-Cre primarily targeted the subfornical organ with few off targets. Fluid intake was evaluated using the 2-bottle choice paradigm with 1 bottle containing water and 1 containing 0.15 mol/L NaCl. RESULTS Arrb2ICV-Cre mice exhibited a greater pressor response to acute ICV-ANG infusion. At baseline conditions, Arrb2ICV-Cre mice exhibited a significant increase in saline intake compared with controls, resulting in a saline preference. Furthermore, when mice were subjected to water-deprived or sodium-depleted conditions, which would naturally increase endogenous ANG levels, Arrb2ICV-Cre mice exhibited elevated saline intake. CONCLUSIONS Overall, these data indicate that ARRB2 in selective cardiovascular nuclei in the brain, including the subfornical organ, counterbalances canonical AT1R responses to both exogenous and endogenous ANG. Stimulation of the AT1R/ARRB axis in the brain may represent a novel strategy to treat hypertension.
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Affiliation(s)
| | - Eden E. Tan
- SUPREMES Program, Marquette University & Medical College of Wisconsin, Milwaukee, WI
| | - John J. Reho
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI
| | | | | | - Ko-Ting Lu
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI
| | - Kelsey K. Wackman
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI
| | - Justin L. Grobe
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI
- Comprehensive Rodent Metabolic Phenotyping Core, Medical College of Wisconsin, Milwaukee, WI
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI
- Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, WI
| | - Pablo Nakagawa
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI
| | - Curt D. Sigmund
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI
- Cardiovascular Center, Medical College of Wisconsin, Milwaukee, WI
- Neuroscience Research Center, Medical College of Wisconsin, Milwaukee, WI
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Huang YC, Liu CJ, Lu ZH, Huang HS. Long-Term Sodium Deficiency Reduces Sodium Excretion but Impairs Renal Function and Increases Stone Formation in Hyperoxaluric Calcium Oxalate Rats. Int J Mol Sci 2024; 25:3942. [PMID: 38612752 PMCID: PMC11011831 DOI: 10.3390/ijms25073942] [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: 02/25/2024] [Revised: 03/19/2024] [Accepted: 03/25/2024] [Indexed: 04/14/2024] Open
Abstract
Excessive sodium intake is associated with nephrolithiasis, but the impact of sodium-deficient (SD) diets is unknown. Hence, we investigated the effects of short- and long-term SD diets on the expression of renal aquaporins and sodium transporters, and thus calcium oxalate (CaOx) crystal formation in hyperoxaluria rats. In a short-term sodium balance study, six male rats received drinking water and six received 0.75% ethylene glycol (EG) to induce hyperoxaluria. After a 30-day period of feeding on normal chow, both groups were treated with a normal-sodium diet for 5 days, followed by a sodium-free diet for the next 5 days. In a long-term SD study (42 days), four groups, induced with EG or not, were treated with normal-sodium water and sodium-free drinking water, alternately. Short-term sodium restriction in EG rats reversed the daily positive sodium balance, but progressively caused a negative cumulative water balance. In the long-term study, the abundant levels of of Na/H exchanger, thiazide-sensitive Na-Cl cotransporter, Na-K-ATPase, and aquaporins-1 from SD + EG rats were markedly reduced, corresponding to a decrease in Uosm, as compared to SD rats. Increased urine calcium, AP(CaOx)index, and renal CaOx deposition were also noted in SD + EG rats. Although the SD treatment reduced sodium excretion, it also increased urinary calcium and impaired renal function, ultimately causing the formation of more CaOx crystals.
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Affiliation(s)
| | | | | | - Ho-Shiang Huang
- Department of Urology, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 704302, Taiwan; (Y.-C.H.); (C.-J.L.); (Z.-H.L.)
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3
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Goto S, Yoshida Y, Hosojima M, Kuwahara S, Kabasawa H, Aoki H, Iida T, Sawada R, Ugamura D, Yoshizawa Y, Takemoto K, Komochi K, Kobayashi R, Kaseda R, Yaoita E, Nagatoishi S, Narita I, Tsumoto K, Saito A. Megalin is involved in angiotensinogen-induced, angiotensin II-mediated ERK1/2 signaling to activate Na + -H + exchanger 3 in proximal tubules. J Hypertens 2023; 41:1831-1843. [PMID: 37682076 DOI: 10.1097/hjh.0000000000003555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
BACKGROUND Kidney angiotensin (Ang) II is produced mainly from liver-derived, glomerular-filtered angiotensinogen (AGT). Podocyte injury has been reported to increase the kidney Ang II content and induce Na + retention depending on the function of megalin, a proximal tubular endocytosis receptor. However, how megalin regulates the renal content and action of Ang II remains elusive. METHODS We used a mass spectrometry-based, parallel reaction-monitoring assay to quantitate Ang II in plasma, urine, and kidney homogenate of kidney-specific conditional megalin knockout (MegKO) and control (Ctl) mice. We also evaluated the pathophysiological changes in both mouse genotypes under the basal condition and under the condition of increased glomerular filtration of AGT induced by administration of recombinant mouse AGT (rec-mAGT). RESULTS Under the basal condition, plasma and kidney Ang II levels were comparable in the two mouse groups. Ang II was detected abundantly in fresh spot urine in conditional MegKO mice. Megalin was also found to mediate the uptake of intravenously administered fluorescent Ang II by PTECs. Administration of rec-mAGT increased kidney Ang II, exerted renal extracellular signal-regulated kinase 1/2 (ERK1/2) signaling, activated proximal tubular Na + -H + exchanger 3 (NHE3), and decreased urinary Na + excretion in Ctl mice, whereas these changes were suppressed but urinary Ang II was increased in conditional MegKO mice. CONCLUSION Increased glomerular filtration of AGT is likely to augment Ang II production in the proximal tubular lumen. Thus, megalin-dependent Ang II uptake should be involved in the ERK1/2 signaling that activates proximal tubular NHE3 in vivo , thereby causing Na + retention.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | - Ryohei Kaseda
- Department of Clinical Nephrology and Rheumatology, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City, Niigata
| | | | | | - Ichiei Narita
- Department of Clinical Nephrology and Rheumatology, Kidney Research Center, Niigata University Graduate School of Medical and Dental Sciences, Niigata City, Niigata
| | - Kouhei Tsumoto
- The Institute of Medical Science and Department of Bioengineering, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
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4
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Visniauskas B, Reverte V, Abshire CM, Ogola BO, Rosales CB, Galeas-Pena M, Sure VN, Sakamuri SSVP, Harris NR, Kilanowski-Doroh I, Mcnally AB, Horton AC, Zimmerman M, Katakam PVG, Lindsey SH, Prieto MC. High-plasma soluble prorenin receptor is associated with vascular damage in male, but not female, mice fed a high-fat diet. Am J Physiol Heart Circ Physiol 2023; 324:H762-H775. [PMID: 36930656 PMCID: PMC10151046 DOI: 10.1152/ajpheart.00638.2022] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 03/02/2023] [Accepted: 03/13/2023] [Indexed: 03/18/2023]
Abstract
Plasma soluble prorenin receptor (sPRR) displays sexual dimorphism and is higher in women with type 2 diabetes mellitus (T2DM). However, the contribution of plasma sPRR to the development of vascular complications in T2DM remains unclear. We investigated if plasma sPRR contributes to sex differences in the activation of the systemic renin-angiotensin-aldosterone system (RAAS) and vascular damage in a model of high-fat diet (HFD)-induced T2DM. Male and female C57BL/6J mice were fed either a normal fat diet (NFD) or an HFD for 28 wk to assess changes in blood pressure, cardiometabolic phenotype, plasma prorenin/renin, sPRR, and ANG II. After completing dietary protocols, tissues were collected from males to assess vascular reactivity and aortic reactive oxygen species (ROS). A cohort of male mice was used to determine the direct contribution of increased systemic sPRR by infusion. To investigate the role of ovarian hormones, ovariectomy (OVX) was performed at 32 wk in females fed either an NFD or HFD. Significant sex differences were found after 28 wk of HFD, where only males developed T2DM and increased plasma prorenin/renin, sPRR, and ANG II. T2DM in males was accompanied by nondipping hypertension, carotid artery stiffening, and aortic ROS. sPRR infusion in males induced vascular thickening instead of material stiffening caused by HFD-induced T2DM. While intact females were less prone to T2DM, OVX increased plasma prorenin/renin, sPRR, and systolic blood pressure. These data suggest that sPRR is a novel indicator of systemic RAAS activation and reflects the onset of vascular complications during T2DM regulated by sex.NEW & NOTEWORTHY High-fat diet (HFD) for 28 wk leads to type 2 diabetes mellitus (T2DM) phenotype, concomitant with increased plasma soluble prorenin receptor (sPRR), nondipping blood pressure, and vascular stiffness in male mice. HFD-fed female mice exhibiting a preserved cardiometabolic phenotype until ovariectomy revealed increased plasma sPRR and blood pressure. Plasma sPRR may indicate the status of systemic renin-angiotensin-aldosterone system (RAAS) activation and the onset of vascular complications during T2DM in a sex-dependent manner.
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Affiliation(s)
- Bruna Visniauskas
- Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana, United States
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
- Tulane Center for Sex-Based Biology and Medicine, New Orleans, Louisiana, United States
| | - Virginia Reverte
- Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Caleb M Abshire
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Benard O Ogola
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
- Vascular Biology Center, Medical College of Georgia at Augusta University, Augusta, Georgia, United States
| | - Carla B Rosales
- Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Michelle Galeas-Pena
- Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Venkata N Sure
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Siva S V P Sakamuri
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Nicholas R Harris
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Isabella Kilanowski-Doroh
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Alexandra B Mcnally
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Alec C Horton
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Margaret Zimmerman
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Prasad V G Katakam
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
| | - Sarah H Lindsey
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana, United States
- Tulane Center for Sex-Based Biology and Medicine, New Orleans, Louisiana, United States
- Tulane Hypertension and Renal Center of Excellence, New Orleans, Louisiana, United States
| | - Minolfa C Prieto
- Department of Physiology, Tulane University School of Medicine, New Orleans, Louisiana, United States
- Tulane Center for Sex-Based Biology and Medicine, New Orleans, Louisiana, United States
- Tulane Hypertension and Renal Center of Excellence, New Orleans, Louisiana, United States
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5
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Yu Y, Wang P, Ren Z, Xue Y, Jia Y, Wang W, Liu M, Pan K, Xiao L, Ji D, Wang X. A low-salt diet with candesartan administration is associated with acute kidney injury in nephritis by increasing nitric oxide. Biomed Pharmacother 2023; 161:114484. [PMID: 36921530 DOI: 10.1016/j.biopha.2023.114484] [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: 01/04/2023] [Revised: 02/28/2023] [Accepted: 03/07/2023] [Indexed: 03/18/2023] Open
Abstract
A low-salt diet may activate the renin-angiotensin-aldosterone system (RAAS) and is often applied simultaneously with RAAS inhibitors, especially for treatment of proteinuric nephritis. To explore the effect of a low-salt diet combined with angiotensin receptor blockers (ARB) on kidney function, the proteinuric nephritis model was induced by single intravenous injection of doxorubicin, and then the SD rats were administrated with candesartan intraperitoneal injection and fed with different salt diets. Rats with low-salt plus candesartan, not either alone, experienced acute kidney injury (AKI) at day 7 and could not self-restore when extending the experiment time from 7 days to 21 days, unless switching low-salt to normal-salt. Among three nitric oxide synthetases (NOS), endothelial NOS (eNOS) was obviously elevated and PI3K-Akt-eNOS signal pathway was activated. NG-Nitro-L-Arginine Methyl Ester (L-NAME), an eNOS inhibitor, reversed the decreased blood pressure and recovered the kidney dysfunction induced by low-salt with candesartan. The increased TUNEL-positive cells, Bax/Bcl-2 and cleaved-caspase3 protein abundance was ameliorated by L-NAME in vivo. In vitro, sodium nitroprusside, a nitric oxide donor, can also increase Bax/Bcl-2 and cleaved-caspase3 protein level in HK-2 cell. Thus, low-salt diet combined with candesartan in nephritis rats led to AKI, and the mechanism involved the increase of eNOS/NO, which linked to the decrease of blood pressure and the increase of apoptosis. This study provides practical guidance for salt intake in cases of RAS inhibitor usage clinically.
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Affiliation(s)
- Yanting Yu
- Department of Nephrology, Nanjing Drum Tower Hospital, Clinical College of Nanjing Medical University, Nanjing, China; Department of Nephrology, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Ping Wang
- The Core Laboratory, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Zhiyun Ren
- The Core Laboratory, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Ying Xue
- The Core Laboratory, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Yutao Jia
- Department of Nephrology, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Weiwan Wang
- The Core Laboratory, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Mingda Liu
- The Core Laboratory, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Kueiching Pan
- Department of Nursing, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China
| | - Leijuan Xiao
- Department of Nephrology, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China.
| | - Daxi Ji
- Department of Nephrology, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China.
| | - Xiaoyan Wang
- Department of Nephrology, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China; The Core Laboratory, Nanjing BenQ Medical Center, The Affiliated BenQ Hospital of Nanjing Medical University, Nanjing, China.
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6
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Prieto MC, Gonzalez AA, Visniauskas B, Navar LG. The evolving complexity of the collecting duct renin-angiotensin system in hypertension. Nat Rev Nephrol 2021; 17:481-492. [PMID: 33824491 PMCID: PMC8443079 DOI: 10.1038/s41581-021-00414-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2021] [Indexed: 02/07/2023]
Abstract
The intrarenal renin-angiotensin system is critical for the regulation of tubule sodium reabsorption, renal haemodynamics and blood pressure. The excretion of renin in urine can result from its increased filtration, the inhibition of renin reabsorption by megalin in the proximal tubule, or its secretion by the principal cells of the collecting duct. Modest increases in circulating or intrarenal angiotensin II (ANGII) stimulate the synthesis and secretion of angiotensinogen in the proximal tubule, which provides sufficient substrate for collecting duct-derived renin to form angiotensin I (ANGI). In models of ANGII-dependent hypertension, ANGII suppresses plasma renin, suggesting that urinary renin is not likely to be the result of increased filtered load. In the collecting duct, ANGII stimulates the synthesis and secretion of prorenin and renin through the activation of ANGII type 1 receptor (AT1R) expressed primarily by principal cells. The stimulation of collecting duct-derived renin is enhanced by paracrine factors including vasopressin, prostaglandin E2 and bradykinin. Furthermore, binding of prorenin and renin to the prorenin receptor in the collecting duct evokes a number of responses, including the non-proteolytic enzymatic activation of prorenin to produce ANGI from proximal tubule-derived angiotensinogen, which is then converted into ANGII by luminal angiotensin-converting enzyme; stimulation of the epithelial sodium channel (ENaC) in principal cells; and activation of intracellular pathways linked to the upregulation of cyclooxygenase 2 and profibrotic genes. These findings suggest that dysregulation of the renin-angiotensin system in the collecting duct contributes to the development of hypertension by enhancing sodium reabsorption and the progression of kidney injury.
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Affiliation(s)
- Minolfa C. Prieto
- Department of Physiology, Tulane University School of Medicine, New Orleans, LA, USA.,Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA, USA.,
| | - Alexis A. Gonzalez
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaiso, Chile
| | - Bruna Visniauskas
- Department of Physiology, Tulane University School of Medicine, New Orleans, LA, USA
| | - L. Gabriel Navar
- Department of Physiology, Tulane University School of Medicine, New Orleans, LA, USA.,Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA, USA
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7
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Guerrero A, Visniauskas B, Cárdenas P, Figueroa SM, Vivanco J, Salinas-Parra N, Araos P, Nguyen QM, Kassan M, Amador CA, Prieto MC, Gonzalez AA. α-Ketoglutarate Upregulates Collecting Duct (Pro)renin Receptor Expression, Tubular Angiotensin II Formation, and Na + Reabsorption During High Glucose Conditions. Front Cardiovasc Med 2021; 8:644797. [PMID: 34179130 PMCID: PMC8220822 DOI: 10.3389/fcvm.2021.644797] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Accepted: 04/13/2021] [Indexed: 11/22/2022] Open
Abstract
Diabetes mellitus (DM) causes high glucose (HG) levels in the plasma and urine. The (pro)renin receptor (PRR) is a key regulator of renal Na+ handling. PRR is expressed in intercalated (IC) cells of the collecting duct (CD) and binds renin to promote angiotensin (Ang) II formation, thereby contributing to Na+ reabsorption. In DM, the Kreb's cycle is in a state of suppression in most tissues. However, in the CD, expression of glucose transporters is augmented, boosting the Kreb's cycle and consequently causing α-ketoglutarate (αKG) accumulation. The αKG receptor 1 (OXGR1) is a Gq-coupled receptor expressed on the apical membrane of IC cells of the CD. We hypothesize that HG causes αKG secretion and activation of OXGR1, which increases PRR expression in CD cells. This effect then promotes intratubular AngII formation and Na+ reabsorption. To test this hypothesis, streptozotocin (STZ)-induced diabetic mice were treated with or without montelukast (ML), an OXGR1 antagonist, for 6 days. STZ mice had higher urinary αKG and PRR expression along with augmented urinary AngII levels and Na+ retention. Treatment with ML prevented all these effects. Similarly, primary cultured inner medullary CD cells treated with HG showed increased PRR expression, while OXGR1 antagonist prevented this effect. αKG increases PRR expression, while treatments with ML, PKC inhibition, or intracellular Ca2+ depletion impair this effect. In silico analysis suggested that αKG binds to mouse OXGR1. These results indicate that HG conditions promote increased levels of intratubular αKG and OXGR1-dependent PRR upregulation, which impact AngII formation and Na+ reabsorption.
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Affiliation(s)
- Aarón Guerrero
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Bruna Visniauskas
- Department of Physiology, School of Medicine, Tulane University, New Orleans, LA, United States
| | - Pilar Cárdenas
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Stefanny M. Figueroa
- Laboratory of Renal Physiopathology, Institute of Biomedical Sciences, Universidad Autónoma de Chile, Santiago, Chile
| | - Jorge Vivanco
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Nicolas Salinas-Parra
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Patricio Araos
- Laboratory of Renal Physiopathology, Institute of Biomedical Sciences, Universidad Autónoma de Chile, Santiago, Chile
| | - Quynh My Nguyen
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, San Diego, CA, United States
| | - Modar Kassan
- Department of Physiology, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Cristián A. Amador
- Laboratory of Renal Physiopathology, Institute of Biomedical Sciences, Universidad Autónoma de Chile, Santiago, Chile
| | - Minolfa C. Prieto
- Department of Physiology, School of Medicine, Tulane University, New Orleans, LA, United States
| | - Alexis A. Gonzalez
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
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8
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Tripathi R, Sullivan RD, Fan THM, Mehta RM, Gladysheva IP, Reed GL. A Low-Sodium Diet Boosts Ang (1-7) Production and NO-cGMP Bioavailability to Reduce Edema and Enhance Survival in Experimental Heart Failure. Int J Mol Sci 2021; 22:4035. [PMID: 33919841 PMCID: PMC8070795 DOI: 10.3390/ijms22084035] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 04/09/2021] [Accepted: 04/12/2021] [Indexed: 12/12/2022] Open
Abstract
Sodium restriction is often recommended in heart failure (HF) to block symptomatic edema, despite limited evidence for benefit. However, a low-sodium diet (LSD) activates the classical renin-angiotensin-aldosterone system (RAAS), which may adversely affect HF progression and mortality in patients with dilated cardiomyopathy (DCM). We performed a randomized, blinded pre-clinical trial to compare the effects of a normal (human-equivalent) sodium diet and a LSD on HF progression in a normotensive model of DCM in mice that has translational relevance to human HF. The LSD reduced HF progression by suppressing the development of pleural effusions (p < 0.01), blocking pathological increases in systemic extracellular water (p < 0.001) and prolonging median survival (15%, p < 0.01). The LSD activated the classical RAAS by increasing plasma renin activity, angiotensin II and aldosterone levels. However, the LSD also significantly up-elevated the counter-regulatory RAAS by boosting plasma angiotensin converting enzyme 2 (ACE2) and angiotensin (1-7) levels, promoting nitric oxide bioavailability and stimulating 3'-5'-cyclic guanosine monophosphate (cGMP) production. Plasma HF biomarkers associated with poor outcomes, such as B-type natriuretic peptide and neprilysin were decreased by a LSD. Cardiac systolic function, blood pressure and renal function were not affected. Although a LSD activates the classical RAAS system, we conclude that the LSD delayed HF progression and mortality in experimental DCM, in part through protective stimulation of the counter-regulatory RAAS to increase plasma ACE2 and angiotensin (1-7) levels, nitric oxide bioavailability and cGMP production.
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Affiliation(s)
- Ranjana Tripathi
- Department of Medicine, University of Arizona College of Medicine-Phoenix, Phoenix, AZ 85004, USA
| | - Ryan D Sullivan
- Department of Medicine, University of Arizona College of Medicine-Phoenix, Phoenix, AZ 85004, USA
| | - Tai-Hwang M Fan
- Department of Medicine, University of Tennessee Health Science Center, Memphis, TN 38163, USA
| | - Radhika M Mehta
- Department of Medicine, University of Arizona College of Medicine-Phoenix, Phoenix, AZ 85004, USA
| | - Inna P Gladysheva
- Department of Medicine, University of Arizona College of Medicine-Phoenix, Phoenix, AZ 85004, USA
| | - Guy L Reed
- Department of Medicine, University of Arizona College of Medicine-Phoenix, Phoenix, AZ 85004, USA
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9
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Yabuki A, Furusawa Y, Miyoshi N, Taniguchi K, Yamato O. Expression of neuronal nitric oxide synthase and renin in dysplastic kidneys of young dogs. J Vet Med Sci 2021; 83:837-840. [PMID: 33814522 PMCID: PMC8182329 DOI: 10.1292/jvms.21-0074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Renin and neuronal nitric oxide synthase in the kidney control the renin-angiotensin and tubuloglomerular feedback systems. The present study investigated the expression of renin and neuronal nitric oxide synthase in the dysplastic kidneys of three young dogs. Renin-immunoreactivity, which occurs in the juxtaglomerular and tubular cells of dysplastic kidneys, did not differ from that in the normal kidneys of young dogs. Macula densa cells in the normal kidneys showed neuronal nitric oxide synthase -immunoreactivity, but those in the dysplastic kidneys showed no apparent signals. This observation may be correlated with the pathological mechanisms of renal failure in young dogs.
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Affiliation(s)
- Akira Yabuki
- Laboratory of Veterinary Clinical Pathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan.,Kagoshima University Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Yu Furusawa
- Kagoshima University Veterinary Teaching Hospital, Joint Faculty of Veterinary Medicine, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan
| | - Noriaki Miyoshi
- Laboratory of Veterinary Histopathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan
| | - Kazuyuki Taniguchi
- Laboratory of Veterinary Anatomy, Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan
| | - Osamu Yamato
- Laboratory of Veterinary Clinical Pathology, Joint Faculty of Veterinary Medicine, Kagoshima University, Kagoshima 890-0065, Japan
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10
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Pinto PR, Yoshinaga MY, Del Bianco V, Bochi AP, Ferreira GS, Pinto IFD, Rodrigues LG, Nakandakare ER, Okamoto MM, Machado UF, Miyamoto S, Catanozi S, Passarelli M. Dietary sodium restriction alters muscle lipidomics that relates to insulin resistance in mice. J Biol Chem 2021; 296:100344. [PMID: 33524391 PMCID: PMC7949138 DOI: 10.1016/j.jbc.2021.100344] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 01/19/2021] [Accepted: 01/21/2021] [Indexed: 12/15/2022] Open
Abstract
A low-sodium (LS) diet has been shown to reduce blood pressure (BP) and the incidence of cardiovascular diseases. However, severe dietary sodium restriction promotes insulin resistance (IR) and dyslipidemia in animal models and humans. Thus, further clarification of the long-term consequences of LS is needed. Here, we investigated the effects of chronic LS on gastrocnemius gene and protein expression and lipidomics and its association with IR and plasma lipids in LDL receptor knockout mice. Three-month-old male mice were fed a normal sodium diet (NS; 0.5% Na; n = 12-19) or LS (0.06% Na; n = 14-20) over 90 days. Body mass (BM), BP, plasma total cholesterol, triacylglycerol (TG), glucose, hematocrit, and IR were evaluated. LS increased BM (9%), plasma TG (51%), blood glucose (19%), and IR (46%) when compared with the NS. RT-qPCR analysis revealed that genes involved in lipid uptake and oxidation were increased by the LS: Fabp3 (106%), Prkaa1 (46%), and Cpt1 (74%). Genes and proteins (assessed by Western blotting) involved in insulin signaling were not changed by the LS. Similarly, lipid species classically involved in muscle IR, such as diacylglycerols and ceramides detected by ultra-high-performance liquid chromatography coupled to mass spectrometry, were also unchanged by LS. Species of phosphatidylcholines (68%), phosphatidylinositol (90%), and free fatty acids (59%) increased while cardiolipins (41%) and acylcarnitines (9%) decreased in gastrocnemius in response to LS and were associated with glucose disposal rate. Together these results suggest that chronic LS alters glycerophospholipid and fatty acids species in gastrocnemius that may contribute to glucose and lipid homeostasis derangements in mice.
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Affiliation(s)
- Paula Ramos Pinto
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Marcos Y Yoshinaga
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Vanessa Del Bianco
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Ana Paula Bochi
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Guilherme S Ferreira
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Isabella F D Pinto
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Letícia G Rodrigues
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Edna R Nakandakare
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Maristela M Okamoto
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Ubiratan F Machado
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Sayuri Miyamoto
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
| | - Sergio Catanozi
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - Marisa Passarelli
- Laboratório de Lípides (LIM-10), Hospital das Clínicas (HCFMUSP) da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil; Programa de Pós-Graduação em Medicina, Universidade Nove de Julho, São Paulo, Brazil.
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11
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Zając M, Rybi-Szumińska A, Storonowicz J, Protas P, Wasilewska A. Urinary excretion of renin and angiotensinogen in hypertensive children and adolescents. Arch Med Sci 2021; 17:1325-1331. [PMID: 34522262 PMCID: PMC8425233 DOI: 10.5114/aoms.2019.88482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 10/17/2018] [Indexed: 11/23/2022] Open
Abstract
INTRODUCTION In recent years hypertension has become an emerging condition in the young population. It has been proposed that the renin-angiotensin system plays an important role in regulation of blood pressure. We assessed whether activation of the intrarenal renin-angiotensin system occurs in hypertensive children and adolescents and what better reflects its activity: urine angiotensinogen (AGT) or urine renin (REN). MATERIAL AND METHODS The study was conducted on a sample of 58 subjects with primary hypertension (HT) and 29 normotensive children and adolescents. We measured urine REN and AGT excretion and assessed the values in relation to blood pressure (BP) and other clinical parameters. Both REN and AGT values were calculated by urine creatinine: REN/cr. and AGT/cr., respectively. RESULTS We observed higher urine REN/cr. values in hypertensive subjects in comparison to the reference group (6.99 vs. 2.93, p = 0.003). Hypertensive participants showed positive correlations between urine REN/cr. and diastolic 24-hour BP (r = 0.42, p = 0.002) as well as between urine REN/cr. and urine AGT/cr. (r = 0.266, p = 0.044, respectively). CONCLUSIONS Increased urine REN/cr. in hypertensive children and adolescents and its positive correlation with BP may indicate its important role in the pathogenesis of HT. Perhaps urine REN/cr. could be a marker of intrarenal renin-angiotensin system activity. Nevertheless, further research should be undertaken to confirm this observation.
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Affiliation(s)
- Magdalena Zając
- Department of Paediatrics and Nephrology, Medical University of Bialystok, Bialystok, Poland
| | | | - Justyna Storonowicz
- Department of Paediatrics and Nephrology, Medical University of Bialystok, Bialystok, Poland
| | - Piotr Protas
- Department of Paediatrics and Nephrology, Medical University of Bialystok, Bialystok, Poland
| | - Anna Wasilewska
- Department of Paediatrics and Nephrology, Medical University of Bialystok, Bialystok, Poland
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12
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Hao S, Salzo J, Zhao H, Hao M, Darzynkiewicz Z, Ferreri NR. MicroRNA-133a-Dependent Inhibition of Proximal Tubule Angiotensinogen by Renal TNF (Tumor Necrosis Factor). Hypertension 2020; 76:1744-1752. [PMID: 33131307 DOI: 10.1161/hypertensionaha.120.15435] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We showed that intrarenal suppression of TNF (tumor necrosis factor) production under low salt (LS) conditions increases renal cortical AGT (angiotensinogen) mRNA and protein expression. Intrarenal injection of murine recombinant TNF attenuated increases of AGT in mice ingesting LS. Moreover, AGT mRNA and protein expression increased ≈6-fold and 2-fold, respectively, in mice ingesting LS that also received an intrarenal injection of a lentivirus construct that specifically silenced TNF in the kidney (U6-TNF-ex4). Silencing of TNF under normal salt and high salt (HS) conditions also resulted in increased AGT expression. Since renal TNF production decreases in response to LS and increases in response to HS, the data suggest that alterations in TNF production under these conditions modulate the degree of AGT expression. We also tested the hypothesis that TNF inhibits intrarenal AGT expression by a mechanism involving miR-133a. Expression of miR-133a decreased in mice given LS and increased in response to HS for 7 days. Intrarenal silencing of TNF reversed the effects of HS on miR-133a-dependent AGT expression. In contrast, intrarenal TNF administration increased miR-133a expression in the kidney. Collectively, the data suggest that miR-133a is a salt-sensitive microRNA that inhibits AGT in the kidney and is increased by TNF. The HS-induced increase in blood pressure observed following silencing of TNF was markedly reduced upon intrarenal administration of miR-133a suggesting that intrinsic effects of TNF in the kidney to limit the blood pressure response to HS include an increase in miR-133a, which suppresses AGT expression.
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Affiliation(s)
- Shoujin Hao
- From the Department of Pharmacology, New York Medical College, Valhalla
| | - Joseph Salzo
- From the Department of Pharmacology, New York Medical College, Valhalla
| | - Hong Zhao
- From the Department of Pharmacology, New York Medical College, Valhalla
| | - Mary Hao
- From the Department of Pharmacology, New York Medical College, Valhalla
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13
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Patinha D, Carvalho C, Persson P, Pihl L, Fasching A, Friederich-Persson M, O'Neill J, Palm F. Determinants of renal oxygen metabolism during low Na + diet: effect of angiotensin II AT 1 and aldosterone receptor blockade. J Physiol 2020; 598:5573-5587. [PMID: 32857872 DOI: 10.1113/jp280481] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Accepted: 08/26/2020] [Indexed: 01/13/2023] Open
Abstract
KEY POINTS Reducing Na+ intake reduces the partial pressure of oxygen in the renal cortex and activates the renin-angiotensin-aldosterone system. In the absence of high blood pressure, these consequences of dietary Na+ reduction may be detrimental for the kidney. In a normotensive animal experimental model, reducing Na+ intake for 2 weeks increased renal oxygen consumption, which was normalized by mineralocorticoid receptor blockade. Furthermore, blockade of the angiotensin II AT1 receptor restored cortical partial pressure of oxygen by improving oxygen delivery. This shows that increased activity of the renin-angiotensin-aldosterone system contributes to increased oxygen metabolism in the kidney after 2 weeks of a low Na+ diet. The results provide insights into dietary Na+ restriction in the absence of high blood pressure, and its consequences for the kidney. ABSTRACT Reduced Na+ intake reduces the P O 2 (partial pressure of oxygen) in the renal cortex. Upon reduced Na+ intake, reabsorption along the nephron is adjusted with activation of the renin-angiotensin-aldosterone system (RAAS). Thus, we studied the effect of reduced Na+ intake on renal oxygen homeostasis and function in rats, and the impact of intrarenal angiotensin II AT1 receptor blockade using candesartan and mineralocorticoid receptor blockade using canrenoic acid potassium salt (CAP). Male Sprague-Dawley rats were fed standard rat chow containing normal (0.25%) and low (0.025%) Na+ for 2 weeks. The animals were anaesthetized (thiobutabarbital 120 mg kg-1 ) and surgically prepared for kidney oxygen metabolism and function studies before and after acute intrarenal arterial infusion of candesartan (4.2 μg kg-1 ) or intravenous infusion of CAP (20 mg kg-1 ). Baseline mean arterial pressure and renal blood flow were similar in both dietary groups. Fractional Na+ excretion and cortical oxygen tension were lower and renal oxygen consumption was higher in low Na+ groups. Neither candesartan nor CAP affected arterial pressure. Renal blood flow and cortical oxygen tension increased in both groups after candesartan in the low Na+ group. Fractional Na+ excretion was increased and oxygen consumption reduced in the low Na+ group after CAP. These results suggest that blockade of angiotensin II AT1 receptors has a major impact upon oxygen delivery during normal and low Na+ conditions, while aldosterone receptors mainly affect oxygen metabolism following 2 weeks of a low Na+ diet.
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Affiliation(s)
- Daniela Patinha
- Institute of Biomedical and Clinical Science, University of Exeter Medical School, University of Exeter, Exeter, UK.,Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Carla Carvalho
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Patrik Persson
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Liselotte Pihl
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Angelica Fasching
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Malou Friederich-Persson
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Julie O'Neill
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
| | - Fredrik Palm
- Department of Medical Cell Biology, Division of Integrative Physiology, Uppsala University, Uppsala, Sweden
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14
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Kemp BA, Howell NL, Keller SR, Gildea JJ, Shao W, Navar LG, Carey RM. Defective Renal Angiotensin III and AT 2 Receptor Signaling in Prehypertensive Spontaneously Hypertensive Rats. J Am Heart Assoc 2020; 8:e012016. [PMID: 31039659 PMCID: PMC6512109 DOI: 10.1161/jaha.119.012016] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Background Previous studies demonstrated that angiotensin (Ang) III, not Ang II, is the predominant endogenous agonist for Ang type‐2 receptor (AT2R)‐induced natriuresis in normal rats, and that hypertensive 12‐week‐old spontaneously hypertensive rats (SHR) lack natriuretic responses to Ang III. This study tested whether prehypertensive SHR already have defective Ang III‐induced natriuresis and determined possible mechanisms. Methods and Results Female and male normotensive 4‐week‐old SHR and Wistar Kyoto rats were studied after 24‐hour systemic AT1R blockade. Left kidneys received 30 minute renal interstitial infusions of vehicle followed by Ang III (3.5, 7.0, 14, and 28 nmol/kg per min; each dose for 30 minutes). Right kidneys received vehicle infusions. In 4‐week‐old Wistar Kyoto rats, renal interstitial Ang III increased urine sodium (Na+) excretion but failed to induce natriuresis in 4‐week‐old SHR. Renal Ang III levels were similar between Wistar Kyoto rats and SHR, making increased Ang III degradation as a possible cause for defective natriuresis in SHR unlikely. In Wistar Kyoto rats, renal interstitial Ang III induced translocation of AT2Rs to apical plasma membranes of renal proximal tubule cells. Simultaneously, Ang III induced retraction of the major Na+ transporter Na+‐H+ exchanger‐3 (NHE‐3) from apical membranes and internalization of Na+/K+ATPase (NKA) from basolateral membranes of renal proximal tubule cells. Consistent with NHE‐3 and NKA retraction, Ang III increased pSer552‐NHE‐3 and decreased pSer23‐NKA. In contrast, in SHR, intrarenal Ang III failed to induce AT2R translocation, NHE‐3 or NKA retraction, pSer552‐NHE‐3 phosphorylation, or pSer23‐NKA dephosphorylation. Conclusions These results indicate impaired Ang III/AT2R signaling as a possible primary defect in prehypertensive SHR. See Editorial Zhuo and Li
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Affiliation(s)
- Brandon A Kemp
- 1 Division of Endocrinology and Metabolism Department of Medicine University of Virginia School of Medicine Charlottesville VA
| | - Nancy L Howell
- 1 Division of Endocrinology and Metabolism Department of Medicine University of Virginia School of Medicine Charlottesville VA
| | - Susanna R Keller
- 1 Division of Endocrinology and Metabolism Department of Medicine University of Virginia School of Medicine Charlottesville VA
| | - John J Gildea
- 2 Department of Pathology University of Virginia School of Medicine Charlottesville VA
| | - Weijian Shao
- 3 Department of Physiology and Hypertension and Renal Center Tulane University School of Medicine New Orleans LA
| | - Luis Gabriel Navar
- 3 Department of Physiology and Hypertension and Renal Center Tulane University School of Medicine New Orleans LA
| | - Robert M Carey
- 1 Division of Endocrinology and Metabolism Department of Medicine University of Virginia School of Medicine Charlottesville VA
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15
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Reverte V, Gogulamudi VR, Rosales CB, Musial DC, Gonsalez SR, Parra-Vitela AJ, Galeas-Pena M, Sure VN, Visniauskas B, Lindsey SH, Katakam PVG, Prieto MC. Urinary angiotensinogen increases in the absence of overt renal injury in high fat diet-induced type 2 diabetic mice. J Diabetes Complications 2020; 34:107448. [PMID: 31761419 PMCID: PMC6981045 DOI: 10.1016/j.jdiacomp.2019.107448] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Revised: 08/09/2019] [Accepted: 09/07/2019] [Indexed: 12/31/2022]
Abstract
AIM OF THE STUDY During type 2 diabetes (T2D) and hypertension there is stimulation of renal proximal tubule angiotensinogen (AGT), but whether urinary excretion of AGT (uAGT) is an indicator of glomerular damage or intrarenal RAS activation is unclear. We tested the hypothesis that elevations in uAGT can be detected in the absence of albuminuria in a mouse model of T2D. METHODS Male C57BL/6 mice (N = 10) were fed a high fat (HFD; 45% Kcal from fat) for 28 weeks, and the metabolic phenotype including body weight, blood pressures, glucose, insulin, ippGTT, HOMA-IR, and cholesterol was examined. In addition, kidney Ang II content and reactive oxygen species (ROS) was measured along with urinary albumin, creatinine, Ang II, and AGT. RESULTS All parameters consistent with T2D were present in mice after 12-14 weeks on the HFD. Systolic BP increased after 18 weeks in HFD but not NFD mice. Intrarenal ROS and Ang II concentrations were also increased in HFD mice. Remarkably, these changes paralleled the augmentation uAGT excretion (3.66 ± 0.50 vs. 0.92 ± 0.13 ng/mg by week 29; P < 0.01), which occurred in the absence of overt albuminuria. CONCLUSIONS In HFD-induced T2D mice, increases in uAGT occur in the absence of overt renal injury, indicating that this biomarker accurately detects early intrarenal RAS activation.
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Affiliation(s)
- Virginia Reverte
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA
| | | | - Carla B Rosales
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA
| | - Diego C Musial
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA; Department of Pharmacology, Universidade Federal de Sao Paulo, Sao Paulo, Brazil
| | - Sabrina R Gonsalez
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA; Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Michelle Galeas-Pena
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA
| | - Venkata N Sure
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, USA
| | - Bruna Visniauskas
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA
| | - Sarah H Lindsey
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, USA
| | - Prasad V G Katakam
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, USA
| | - Minolfa C Prieto
- Department of Physiology, Tulane University School of Medicine, New Orleans, USA; Hypertension and Renal Center of Excellence, New Orleans, USA.
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16
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Dolomatov S, Zukow W, Novikov N, Markaryan A, Eremeeva E. EXPRESSION OF THE RENIN-ANGIOTENSIN SYSTEM COMPONENTS IN ONCOLOGIC DISEASES. Acta Clin Croat 2019; 58:354-364. [PMID: 31819334 PMCID: PMC6884393 DOI: 10.20471/acc.2019.58.02.21] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The literature devoted to changes in the expression of the renin-angiotensin system (RAS) proteins of cancer cells was analyzed. The dynamics of RAS protein expression in malignant tumors and the possible role of epigenetic mechanisms in these processes are briefly reviewed. Through research of the epigenetic mechanisms in cancer, principally new techniques for their correction based on the use of selective regulatory systems of covalent modification of histone proteins (for example, deacetylase inhibitor) and microRNA synthesis technologies have been developed. Literature data show promising pharmacological correction of epigenetic modification of chromatin in the treatment of cancer.
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Affiliation(s)
| | - Walery Zukow
- 1Department of Medical Biology, Medical Academy SI Georgievsky, Crimea Federal University, Simferopol, Russian Federation jurisdiction; 2Faculty of Earth, Nicolaus Copernicus University, Toruń, Poland; 3A. Tsyb Medical Radiological Research Center, branch of the National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Kaluga Region, Russian Federation
| | - Nikolay Novikov
- 1Department of Medical Biology, Medical Academy SI Georgievsky, Crimea Federal University, Simferopol, Russian Federation jurisdiction; 2Faculty of Earth, Nicolaus Copernicus University, Toruń, Poland; 3A. Tsyb Medical Radiological Research Center, branch of the National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Kaluga Region, Russian Federation
| | - Alexandra Markaryan
- 1Department of Medical Biology, Medical Academy SI Georgievsky, Crimea Federal University, Simferopol, Russian Federation jurisdiction; 2Faculty of Earth, Nicolaus Copernicus University, Toruń, Poland; 3A. Tsyb Medical Radiological Research Center, branch of the National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Kaluga Region, Russian Federation
| | - Elena Eremeeva
- 1Department of Medical Biology, Medical Academy SI Georgievsky, Crimea Federal University, Simferopol, Russian Federation jurisdiction; 2Faculty of Earth, Nicolaus Copernicus University, Toruń, Poland; 3A. Tsyb Medical Radiological Research Center, branch of the National Medical Research Radiological Center of the Ministry of Health of the Russian Federation, Obninsk, Kaluga Region, Russian Federation
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17
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Nair AR, Agbor LN, Mukohda M, Liu X, Hu C, Wu J, Sigmund CD. Interference With Endothelial PPAR (Peroxisome Proliferator-Activated Receptor)-γ Causes Accelerated Cerebral Vascular Dysfunction in Response to Endogenous Renin-Angiotensin System Activation. Hypertension 2019; 72:1227-1235. [PMID: 30354810 DOI: 10.1161/hypertensionaha.118.11857] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Low-salt diet is beneficial in salt-sensitive hypertension but may provoke cardiovascular risk in patients with heart failure, diabetes mellitus, or other cardiovascular abnormalities because of endogenous renin-angiotensin system activation. PPAR (peroxisome proliferator-activated receptor)-γ is a transcription factor which promotes an antioxidant pathway in the endothelium. We studied transgenic mice expressing a dominant-negative mutation in PPAR-γ selectively in the endothelium (E-V290M) to test the hypothesis that endothelial PPAR-γ plays a protective role in response to low salt-mediated renin-angiotensin system activation. Plasma renin and Ang II (angiotensin II) were significantly and equally increased in all mice fed low salt for 6 weeks. Vasorelaxation to acetylcholine was not affected in basilar artery from E-V290M at baseline but was significantly and selectively impaired in E-V290M after low salt. Unlike basilar artery, low salt was not sufficient to induce vascular dysfunction in carotid artery or aorta. Endothelial dysfunction in the basilar artery from E-V290M mice fed low salt was attenuated by scavengers of superoxide, inhibitors of NADPH oxidase, or blockade of the Ang II AT1 (angiotensin type-1) receptor. Simultaneous AT1 and AT2 receptor blockade revealed that the restoration of endothelial function after AT1 receptor blockade was not a consequence of AT2 receptor activation. We conclude that interference with PPAR-γ in the endothelium produces endothelial dysfunction in the cerebral circulation in response to low salt-mediated activation of the endogenous renin-angiotensin system, mediated at least in part, through AT1 receptor activation and perturbed redox homeostasis. Moreover, our data suggest that the cerebral circulation may be particularly sensitive to inhibition of PPAR-γ activity and renin-angiotensin system activation.
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Affiliation(s)
- Anand R Nair
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
| | - Larry N Agbor
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
| | - Masashi Mukohda
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
| | - Xuebo Liu
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
| | - Chunyan Hu
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
| | - Jing Wu
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
| | - Curt D Sigmund
- From the Department of Pharmacology, UIHC Center for Hypertension Research, Roy J. and Lucille A. Carver College of Medicine, University of Iowa
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18
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AlMarabeh S, Abdulla MH, O'Halloran KD. Is Aberrant Reno-Renal Reflex Control of Blood Pressure a Contributor to Chronic Intermittent Hypoxia-Induced Hypertension? Front Physiol 2019; 10:465. [PMID: 31105584 PMCID: PMC6491928 DOI: 10.3389/fphys.2019.00465] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Accepted: 04/04/2019] [Indexed: 12/16/2022] Open
Abstract
Renal sensory nerves are important in the regulation of body fluid and electrolyte homeostasis, and blood pressure. Activation of renal mechanoreceptor afferents triggers a negative feedback reno-renal reflex that leads to the inhibition of sympathetic nervous outflow. Conversely, activation of renal chemoreceptor afferents elicits reflex sympathoexcitation. Dysregulation of reno-renal reflexes by suppression of the inhibitory reflex and/or activation of the excitatory reflex impairs blood pressure control, predisposing to hypertension. Obstructive sleep apnoea syndrome (OSAS) is causally related to hypertension. Renal denervation in patients with OSAS or in experimental models of chronic intermittent hypoxia (CIH), a cardinal feature of OSAS due to recurrent apnoeas (pauses in breathing), results in a decrease in circulating norepinephrine levels and attenuation of hypertension. The mechanism of the beneficial effect of renal denervation on blood pressure control in models of CIH and OSAS is not fully understood, since renal denervation interrupts renal afferent signaling to the brain and sympathetic efferent signals to the kidneys. Herein, we consider the currently proposed mechanisms involved in the development of hypertension in CIH disease models with a focus on oxidative and inflammatory mediators in the kidneys and their potential influence on renal afferent control of blood pressure, with wider consideration of the evidence available from a variety of hypertension models. We draw focus to the potential contribution of aberrant renal afferent signaling in the development, maintenance and progression of high blood pressure, which may have relevance to CIH-induced hypertension.
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Affiliation(s)
- Sara AlMarabeh
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Mohammed H Abdulla
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Ken D O'Halloran
- Department of Physiology, School of Medicine, College of Medicine and Health, University College Cork, Cork, Ireland
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19
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Gonsalez SR, Ferrão FM, Souza AMD, Lowe J, Morcillo LDSL. Inappropriate activity of local renin-angiotensin-aldosterone system during high salt intake: impact on the cardio-renal axis. ACTA ACUST UNITED AC 2018; 40:170-178. [PMID: 29944159 PMCID: PMC6533978 DOI: 10.1590/2175-8239-jbn-3661] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2016] [Accepted: 01/11/2017] [Indexed: 12/12/2022]
Abstract
Although there is a general agreement on the recommendation for reduced salt
intake as a public health issue, the mechanism by which high salt intake
triggers pathological effects on the cardio-renal axis is not completely
understood. Emerging evidence indicates that the renin-angiotensin-aldosterone
system (RAAS) is the main target of high Na+ intake. An inappropriate
activation of tissue RAAS may lead to hypertension and organ damage. We reviewed
the impact of high salt intake on the RAAS on the cardio-renal axis highlighting
the molecular pathways that leads to injury effects. We also provide an
assessment of recent observational studies related to the consequences of
non-osmotically active Na+ accumulation, breaking the paradigm that
high salt intake necessarily increases plasma Na+ concentration
promoting water retention
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Affiliation(s)
- Sabrina Ribeiro Gonsalez
- Universidade Federal do Rio de Janeiro, Instituto de Ciências Biomédicas, Rio de Janeiro, RJ, Brasil
| | - Fernanda Magalhães Ferrão
- Universidade do Estado do Rio de Janeiro, Instituto de Biologia Roberto Alcântara Gomes, Rio de Janeiro, RJ, Brasil
| | | | - Jennifer Lowe
- Universidade Federal do Rio de Janeiro, Instituto de Biofísica Carlos Chagas Filho, Rio de Janeiro, Brasil
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Pringle KG, de Meaultsart CC, Sykes SD, Weatherall LJ, Keogh L, Clausen DC, Dekker GA, Smith R, Roberts CT, Rae KM, Lumbers ER. Urinary angiotensinogen excretion in Australian Indigenous and non-Indigenous pregnant women. Pregnancy Hypertens 2018; 12:110-117. [PMID: 29674190 DOI: 10.1016/j.preghy.2018.04.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Revised: 02/12/2018] [Accepted: 04/11/2018] [Indexed: 12/28/2022]
Abstract
The intrarenal renin-angiotensin system (iRAS) is implicated in the pathogenesis of hypertension, chronic kidney disease and diabetic nephropathy. Urinary angiotensinogen (uAGT) levels reflect the activity of the iRAS and are altered in women with preeclampsia. Since Indigenous Australians suffer high rates and early onset of renal disease, we hypothesised that Indigenous Australian pregnant women, like non-Indigenous women with pregnancy complications, would have altered uAGT levels. The excretion of RAS proteins was measured in non-Indigenous and Indigenous Australian women with uncomplicated or complicated pregnancies (preeclampsia, diabetes/gestational diabetes, proteinuria/albuminuria, hypertension, small/large for gestational age, preterm birth), and in non-pregnant non-Indigenous women. Non-Indigenous pregnant women with uncomplicated pregnancies, had higher uAGT/creatinine levels than non-Indigenous non-pregnant women (P < 0.01), and levels increased as pregnancy progressed (P < 0.001). In non-Indigenous pregnant women with pregnancy complications, uAGT/creatinine was suppressed in the third trimester (P < 0.01). In Indigenous pregnant women with uncomplicated pregnancies, there was no change in uAGT/creatinine with gestational age and uAGT/creatinine was lower in the 2nd and 3rd trimesters than in non-Indigenous pregnant women with uncomplicated pregnancies (P < 0.03, P < 0.007, respectively). The uAGT/creatinine ratios of Indigenous women with uncomplicated or complicated pregnancies were the same. A decrease in uAGT/creatinine with advancing gestational age was associated with increased urinary albumin/creatinine, as is seen in preeclampsia, but it was not specific for this disorder. The reduced uAGT/creatinine in Indigenous pregnant women may reflect subclinical renal dysfunction which limits the ability of the kidney to maintain sodium balance and could indicate an increased risk of pregnancy complications and/or future renal disease.
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Affiliation(s)
- Kirsty G Pringle
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, The University of Newcastle, Callaghan, New South Wales, Australia; Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton, New South Wales, Australia.
| | - Celine Corbisier de Meaultsart
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, The University of Newcastle, Callaghan, New South Wales, Australia; Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton, New South Wales, Australia
| | - Shane D Sykes
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, The University of Newcastle, Callaghan, New South Wales, Australia; Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton, New South Wales, Australia
| | - Loretta J Weatherall
- Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Gomeroi Gaaynggal Centre, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia; University of Newcastle Department of Rural Health, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia
| | - Lyniece Keogh
- Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Gomeroi Gaaynggal Centre, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia; University of Newcastle Department of Rural Health, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia
| | - Don C Clausen
- Pathology North, New South Wales Health, Tamworth, New South Wales, Australia
| | - Gus A Dekker
- Adelaide Medical School and Robinson Research Institute, University of Adelaide, Adelaide, Australia
| | - Roger Smith
- Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton, New South Wales, Australia
| | - Claire T Roberts
- Adelaide Medical School and Robinson Research Institute, University of Adelaide, Adelaide, Australia
| | - Kym M Rae
- Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Gomeroi Gaaynggal Centre, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia; University of Newcastle Department of Rural Health, Faculty of Health and Medicine, The University of Newcastle, Tamworth, New South Wales, Australia; Priority Research Centre for Generational Health and Aging, University of Newcastle, Callaghan, New South Wales, Australia
| | - Eugenie R Lumbers
- School of Biomedical Sciences and Pharmacy, Faculty of Health and Medicine, The University of Newcastle, Callaghan, New South Wales, Australia; Priority Research Centre for Reproductive Science, University of Newcastle, Callaghan, New South Wales, Australia; Mothers and Babies Research Centre, Hunter Medical Research Institute, New Lambton, New South Wales, Australia
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Night-time activation of the intrarenal renin–angiotensin system due to nocturnal hypertension is associated with renal arteriosclerosis in normotensive IgA nephropathy patients. Hypertens Res 2018; 41:334-341. [DOI: 10.1038/s41440-018-0026-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 10/05/2017] [Accepted: 11/07/2017] [Indexed: 01/13/2023]
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Hennrikus M, Gonzalez AA, Prieto MC. The prorenin receptor in the cardiovascular system and beyond. Am J Physiol Heart Circ Physiol 2018; 314:H139-H145. [PMID: 29101170 PMCID: PMC5867650 DOI: 10.1152/ajpheart.00373.2017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 10/18/2017] [Accepted: 10/18/2017] [Indexed: 01/24/2023]
Abstract
Since the prorenin receptor (PRR) was first reported, its physiological role in many cellular processes has been under intense scrutiny. The PRR is currently recognized as a multifunctional receptor with major roles as an accessory protein of the vacuolar-type H+-ATPase and as an intermediary in the Wnt signaling pathway. As a member of the renin-angiotensin system (RAS), the PRR has demonstrated to be of relevance in cardiovascular diseases (CVD) because it can activate prorenin and enhance the enzymatic activity of renin, thus promoting angiotensin II formation. Indeed, there is an association between PRR gene polymorphisms and CVD. Independent of angiotensin II, the activation of the PRR further stimulates intracellular signals linked to fibrosis. Studies using tissues and cells from a variety of organs and systems have supported its roles in multiple functions, although some remain controversial. In the brain, the PRR appears to be involved in the central regulation of blood pressure via activation of RAS- and non-RAS-dependent mechanisms. In the heart, the PRR promotes atrial structural and electrical remodeling. Nonetheless, animals overexpressing the PRR do not exhibit cardiac injury. In the kidney, the PRR is involved in the development of ureteric bud branching, urine concentration, and regulation of blood pressure. There is great interest in the PRR contributions to T cell homeostasis and to the development of visceral and brown fat. In this mini-review, we discuss the evidence for the pathophysiological roles of the PRR with emphasis in CVD.
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Affiliation(s)
- Matthew Hennrikus
- Department of Physiology, Tulane University School of Medicine , New Orleans, Louisiana
| | - Alexis A Gonzalez
- Instituto de Química, Pontificia Universidad Católica de Valparaíso , Valparaíso , Chile
| | - Minolfa C Prieto
- Department of Physiology, Tulane University School of Medicine , New Orleans, Louisiana
- Tulane University Renal and Hypertension Center of Excellence , New Orleans, Louisiana
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He Y, Yang W, Liu S, Gan L, Zhang F, Mu C, Wang J, Qu L, Wang R, Deng J, Ye Q, Yang X, Dong Y, Wang Q, Wei C, Hou Z, Yang L. Interactions between angiotensin-converting enzyme-2 polymorphisms and high salt intake increase the risk of hypertension in the Chinese Wa population. INTERNATIONAL JOURNAL OF CLINICAL AND EXPERIMENTAL PATHOLOGY 2017; 10:11159-11168. [PMID: 31966466 PMCID: PMC6965882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 08/08/2017] [Indexed: 06/10/2023]
Abstract
Interactions between angiotensin-converting enzyme-2 (ACE2) gene polymorphisms and high salt intake increase the risk of hypertension (HTN); however, this association is not well-established in the Chinese Wa population. In this study, we investigated the prevalence and associated factors of HTN in the Chinese Wa ethnic minority in Yunnan Province, China. In addition, we assessed the associations of single nucleotide polymorphisms (SNPs) in ACE2 with blood pressure and environmental factors. Among a total of 838 Wa individuals, the overall prevalence, awareness, treatment and control rates of HTN were 31.03%, 32.81%, 10.77%, and 0.70%, respectively. In addition, 260 hypertensive patients and 290 normotensive individuals were randomly selected for investigations of salt intake and ACE2 SNPs. The levels of e24-h salt intake in female hypertensive patients were significantly higher that those in normotensive individuals. The ACE2 rs2285666 T allele or TT genotype and rs714205 G allele or GG genotype were identified as risk factors for the development of HTN in female Wa individuals. The CGTG haplotype was a risk factor in hypertensive patients. Moreover, high salt intake increased the occurrence of hypertension among ACE2 rs2285666 TT and rs714205 GG individuals. In this study, we not only identified an association between ACE2 gene polymorphism and HTN in the Chinese Wa population, but also a possible link interaction between ACE2 polymorphism type and high salt intake in increasing the risk of HTN in this population.
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Affiliation(s)
- Yan He
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Wenhui Yang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Shijie Liu
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Lulu Gan
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Fan Zhang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Changhuan Mu
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Jun Wang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Lifeng Qu
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Ruiping Wang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Jie Deng
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Qiufang Ye
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Xiaolei Yang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Yang Dong
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Qin Wang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Chuanyu Wei
- Department of Central Laboratory, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Zongliu Hou
- Department of Central Laboratory, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
| | - Li Yang
- Department of Geriatrics, Yan’an Affiliated Hospital of Kunming Medical UniversityKunming, Yunnan, People’s Republic of China
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Mun EG, Sohn HS, Kim MS, Cha YS. Antihypertensive effect of Ganjang (traditional Korean soy sauce) on Sprague-Dawley Rats. Nutr Res Pract 2017; 11:388-395. [PMID: 28989575 PMCID: PMC5621361 DOI: 10.4162/nrp.2017.11.5.388] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Revised: 05/17/2017] [Accepted: 09/15/2017] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND/OBJECTIVES Although Korean fermented foods contain large amounts of salt, which is known to exacerbate health problems, these foods still have beneficial effects such as anti-hypertension, anti-cancer, and anti-colitis properties. We hypothesized that ganjang may have different effects on blood pressure compared to same concentrations of salt. MATERIALS/METHODS Sprague-Dawley rats were divided into control (CT), NaCl (NC), and ganjang (GJ) groups and orally administered with 8% NaCl concentration for 9 weeks. The systolic blood pressure (SBP), serum chemistry, Na+ and K+ concentrations and renal gene expressions were measured. RESULTS The SBP was significantly increased in the NC group compared to the GJ and CT groups. In addition, the Na+ concentration in urine was higher in the GJ and NC groups than the CT group, but the urine volume was increased in the GJ group compared to the other groups. The serum renin levels were decreased in the GJ group compared to the CT group, while the serum aldosterone level was decreased in the GJ group relative to the NC group. The mRNA expression of the renin, angiotensin II type I receptor, and mineralocorticoid receptor were significantly lower in the GJ group compared to other groups. Furthermore, GJ group showed the lowest levels of genes for Na+ transporter in kidney cortex such as Na+/K+ ATPaseα1 (NKAα1), Na+/H+ exchanger 3 (NHE3), Na+/HCO3- co-exchanger (NBC), and carbonic anhydrases II (CAII). CONCLUSIONS The decreased SBP in the GJ could be due to decreased renin and aldosterone levels in serum and increased urinary volume and excretion of Na+ with its transporter gene alteration. Therefore, ganjang may have antihypertensive effect despite its high contents of salt.
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Affiliation(s)
- Eun-Gyung Mun
- Department of Food Science and Human Nutrition, Chonbuk National University, 567, Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 54896, Korea
| | - Hee-Sook Sohn
- Department of Food Science and Human Nutrition, Chonbuk National University, 567, Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 54896, Korea
| | - Mi-Sun Kim
- Department of Food Science and Human Nutrition, Chonbuk National University, 567, Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 54896, Korea
| | - Youn-Soo Cha
- Department of Food Science and Human Nutrition, Chonbuk National University, 567, Baekje-daero, Duckjin-gu, Jeonju, Jeonbuk 54896, Korea
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25
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Urushihara M, Kagami S. Role of the intrarenal renin-angiotensin system in the progression of renal disease. Pediatr Nephrol 2017; 32:1471-1479. [PMID: 27380400 DOI: 10.1007/s00467-016-3449-7] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 06/15/2016] [Accepted: 06/17/2016] [Indexed: 01/08/2023]
Abstract
The intrarenal renin-angiotensin system (RAS) has many well-documented pathophysiologic functions in both blood pressure regulation and renal disease development. Angiotensin II (Ang II) is the major bioactive product of the RAS. It induces inflammation, renal cell growth, mitogenesis, apoptosis, migration, and differentiation. In addition, Ang II regulates the gene expression of bioactive substances and activates multiple intracellular signaling pathways that are involved in renal damage. Activation of the Ang II type 1 (AT1) receptor pathway results in the production of proinflammatory mediators, intracellular formation of reactive oxygen species, cell proliferation, and extracellular matrix synthesis, which in turn facilities renal injury. Involvement of angiotensinogen (AGT) in intrarenal RAS activation and development of renal disease has previously been reported. Moreover, studies have demonstrated that the urinary excretion rates of AGT provide a specific index of the intrarenal RAS status. Enhanced intrarenal AGT levels have been observed in experimental models of renal disease, supporting the concept that AGT plays an important role in the development and progression of renal disease. In this review, we focus on the role of intrarenal RAS activation in the pathophysiology of renal disease. Additionally, we explored the potential of urinary AGT as a novel biomarker of intrarenal RAS status in renal disease.
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Affiliation(s)
- Maki Urushihara
- Department of Pediatrics, Institute of Biomedical Sciences, Tokushima University Graduate School, Kuramoto-cho 3-18-15, Tokushima, Tokushima, 770-8503, Japan.
| | - Shoji Kagami
- Department of Pediatrics, Institute of Biomedical Sciences, Tokushima University Graduate School, Kuramoto-cho 3-18-15, Tokushima, Tokushima, 770-8503, Japan
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26
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Fuwa D, Fukuda M, Ogiyama Y, Sato R, Mizuno M, Miura T, Abe-Dohmae S, Michikawa M, Kobori H, Ohte N. Addition of hydrochlorothiazide to angiotensin receptor blocker therapy can achieve a lower sodium balance with no acceleration of intrarenal renin angiotensin system in patients with chronic kidney disease. J Renin Angiotensin Aldosterone Syst 2016; 17:1470320316652032. [PMID: 27283968 PMCID: PMC4940185 DOI: 10.1177/1470320316652032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 04/14/2016] [Indexed: 01/09/2023] Open
Abstract
Objective: Angiotensin receptor blockers (ARBs) produce a lower sodium (Na) balance, and the natriuretic effect is enhanced under Na deprivation, despite falls in blood pressure (BP) and glomerular filtration rate (GFR). Methods: The effect of additional hydrochlorothiazide (HCTZ; 12.5 mg/day) to ARB treatment (valsartan; 80 mg/day) on glomerulotubular Na balance was evaluated in 23 patients with chronic kidney disease. Results: Add-on HCTZ decreased GFR, tubular Na load, and tubular Na reabsorption (tNa), although 24-hour urinary Na excretion (UNaV) remained constant. Daily urinary angiotensinogen excretion (UAGTV, 152±10→82±17 μg/g Cre) reduced (p=0.02). Changes in tubular Na load (r2=0.26) and tNa (r2=0.25) correlated with baseline 24-hour UAGTV. Changes in filtered Na load correlated with changes in nighttime systolic BP (r2=0.17), but not with changes in daytime systolic BP. The change in the tNa to filtered Na load ratio was influenced by the change in daytime UNaV (β=−0.67, F=16.8), rather than the change in nighttime UNaV. Conclusions: Lower Na balance was produced by add-on HCTZ to ARB treatment without an increase of intra-renal renin-angiotensin system activity, leading to restoration of nocturnal hypertension. A further study is needed to demonstrate that the reduction of UAGTV by additional diuretics to ARBs prevents the progression of nephropathy or cardiovascular events.
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Affiliation(s)
- Daisuke Fuwa
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Michio Fukuda
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Yoshiaki Ogiyama
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Ryo Sato
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Masashi Mizuno
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Toshiyuki Miura
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Sumiko Abe-Dohmae
- Department of Biochemistry, Nagoya City University Graduate School of Medical Sciences, Japan
| | - Makoto Michikawa
- Department of Biochemistry, Nagoya City University Graduate School of Medical Sciences, Japan
| | | | - Nobuyuki Ohte
- Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Japan
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Shao W, Miyata K, Katsurada A, Satou R, Seth DM, Rosales CB, Prieto MC, Mitchell KD, Navar LG. Increased angiotensinogen expression, urinary angiotensinogen excretion, and tissue injury in nonclipped kidneys of two-kidney, one-clip hypertensive rats. Am J Physiol Renal Physiol 2016; 311:F278-90. [PMID: 27194718 DOI: 10.1152/ajprenal.00419.2015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2015] [Accepted: 05/11/2016] [Indexed: 01/13/2023] Open
Abstract
In angiotensin II (ANG II)-dependent hypertension, there is an angiotensin type 1 receptor-dependent amplification mechanism enhancing intrarenal angiotensinogen (AGT) formation and secretion in the tubular fluid. To evaluate the role of increased arterial pressure, AGT mRNA, protein expression, and urinary AGT (uAGT) excretion and tissue injury were assessed in both kidneys of two-kidney, one-clip Sprague-Dawley hypertensive rats subjected to left renal arterial clipping (0.25-mm gap). By 18-21 days, systolic arterial pressure increased to 180 ± 3 mmHg, and uAGT increased. Water intake, body weights, 24-h urine volumes, and sodium excretion were similar. In separate measurements of renal function in anesthetized rats, renal plasma flow and glomerular filtration rate were similar in clipped and nonclipped kidneys and not different from those in sham rats, indicating that the perfusion pressure to the clipped kidneys remained within the autoregulatory range. The nonclipped kidneys exhibited increased urine flow and sodium excretion. The uAGT excretion was significantly greater in nonclipped kidneys compared with clipped and sham kidneys. AGT mRNA was 2.15-fold greater in the nonclipped kidneys compared with sham (1.0 ± 0.1) or clipped (0.98 ± 0.15) kidneys. AGT protein levels were also greater in the nonclipped kidneys. The nonclipped kidneys exhibited greater glomerular expansion and immune cell infiltration, medullary fibrosis, and cellular proliferation than the clipped kidneys. Because both kidneys have elevated ANG II levels, the greater tissue injury in the nonclipped kidneys indicates that an increased arterial pressure synergizes with increased intrarenal ANG II to stimulate AGT production and exert greater renal injury.
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Affiliation(s)
- Weijian Shao
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Kayoko Miyata
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Akemi Katsurada
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Ryousuke Satou
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Dale M Seth
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Carla B Rosales
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Minolfa C Prieto
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - Kenneth D Mitchell
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
| | - L Gabriel Navar
- Department of Physiology, Tulane Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, Louisiana
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28
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Manhiani MM, Seth DM, Banes-Berceli AKL, Satou R, Navar LG, Brands MW. The role of IL-6 in the physiologic versus hypertensive blood pressure actions of angiotensin II. Physiol Rep 2015; 3:3/10/e12595. [PMID: 26486161 PMCID: PMC4632961 DOI: 10.14814/phy2.12595] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Angiotensin II (AngII) is a critical physiologic regulator of volume homeostasis and mean arterial pressure (MAP), yet it also is known to induce immune mechanisms that contribute to hypertension. This study determined the role of interleukin-6 (IL-6) in the physiologic effect of AngII to maintain normal MAP during low-salt (LS) intake, and whether hypertension induced by plasma AngII concentrations measured during LS diet required IL-6. IL-6 knockout (KO) and wild-type (WT) mice were placed on LS diet for 7 days, and MAP was measured 19 h/day with telemetry. MAP was not affected by LS in either group, averaging 101 ± 4 and 100 ± 4 mmHg in WT and KO mice, respectively, over the last 3 days. Seven days of ACEI decreased MAP ∼25 mmHg in both groups. In other KO and WT mice, AngII was infused at 200 ng/kg per minute to approximate plasma AngII levels during LS. Surgical reduction of kidney mass and high-salt diet were used to amplify the blood pressure effect. The increase in MAP after 7 days was not different, averaging 20 ± 5 and 22 ± 6 mmHg in WT and KO mice, respectively. Janus Kinase 2 (JAK2)/signal transducer of activated transcription (STAT3) phosphorylation were not affected by LS, but were increased by AngII infusion at 200 and 800 ng/kg per minute. These data suggest that physiologic levels of AngII do not activate or require IL-6 to affect blood pressure significantly, whether AngII is maintaining blood pressure on LS diet or causing blood pressure to increase. JAK2/STAT3 activation, however, is tightly associated with AngII hypertension, even when caused by physiologic levels of AngII.
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Affiliation(s)
| | - Dale M Seth
- Department of Physiology and Hypertension and Renal Center of Excellence, Tulane University, New Orleans, Louisiana
| | | | - Ryosuke Satou
- Department of Physiology and Hypertension and Renal Center of Excellence, Tulane University, New Orleans, Louisiana
| | - L Gabriel Navar
- Department of Physiology and Hypertension and Renal Center of Excellence, Tulane University, New Orleans, Louisiana
| | - Michael W Brands
- Department of Physiology, Medical College of Georgia, Augusta, Georgia
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29
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Gonzalez AA, Prieto MC. Roles of collecting duct renin and (pro)renin receptor in hypertension: mini review. Ther Adv Cardiovasc Dis 2015; 9:191-200. [PMID: 25780059 PMCID: PMC4560657 DOI: 10.1177/1753944715574817] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
In angiotensin (Ang)-II-dependent hypertension, collecting duct renin synthesis and secretion are stimulated despite suppression of juxtaglomerular (JG) renin. This effect is mediated by Ang II type 1 (AT1) receptor independent of blood pressure. Although the regulation of JG renin is known, the mechanisms by which renin is regulated in the collecting duct are not completely understood. The presence of renin activity in the collecting duct may provide a pathway for intratubular Ang II formation since angiotensinogen substrate and angiotensin converting enzyme are present in the distal nephron. The recently named new member of the renin-angiotensin system (RAS), the (pro)renin receptor [(P)RR], is able to bind renin and the inactive prorenin, thus enhancing renin activity and fully activating prorenin. We have demonstrated that renin and (P)RR are augmented in renal tissues from rats infused with Ang II and during sodium depletion, suggesting a physiological role in intrarenal RAS activation. Importantly, (P)RR activation also causes activation of intracellular pathways associated with increased cyclooxygenase 2 expression and induction of profibrotic genes. In addition, renin and (P)RR are upregulated by Ang II in collecting duct cells. Although the mechanisms involved in their regulation are still under study, they seem to be dependent on the intrarenal RAS activation. The complexities of the mechanisms of stimulation also depend on cyclooxygenase 2 and sodium depletion. Our data suggest that renin and (P)RR can interact to increase intratubular Ang II formation and the activation of profibrotic genes in renal collecting duct cells. Both pathways may have a critical role in the development of hypertension and renal disease.
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Affiliation(s)
- Alexis A Gonzalez
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Chile
| | - Minolfa C Prieto
- Department of Physiology, Rm 4061, Tulane University School of Medicine, 1430 Tulane Ave, New Orleans, LA 70112, USA
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Majid DSA, Prieto MC, Navar LG. Salt-Sensitive Hypertension: Perspectives on Intrarenal Mechanisms. Curr Hypertens Rev 2015; 11:38-48. [PMID: 26028244 DOI: 10.2174/1573402111666150530203858] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 04/22/2015] [Accepted: 04/24/2015] [Indexed: 12/12/2022]
Abstract
Salt sensitive hypertension is characterized by increases in blood pressure in response to increases in dietary salt intake and is associated with an enhanced risk of cardiovascular and renal morbidity. Although researchers have sought for decades to understand how salt sensitivity develops in humans, the mechanisms responsible for the increases in blood pressure in response to high salt intake are complex and only partially understood. Until now, scientists have been unable to explain why some individuals are salt sensitive and others are salt resistant. Although a central role for the kidneys in the development of salt sensitivity and hypertension has been generally accepted, it is also recognized that hypertension is of multifactorial origin and a variety of factors can induce, or prevent, blood pressure responsiveness to the manipulation of salt intake. Excess salt intake in susceptible persons may also induce inappropriate central and sympathetic nervous system responses and increase the production of intrarenal angiotensin II, catecholamines and other factors such as oxidative stress and inflammatory cytokines. One key factor is the concomitant inappropriate or paradoxical activation of the intrarenal renin-angiotensin system, by high salt intake. This is reflected by the increases in urinary angiotensinogen during high salt intake in salt sensitive models. A complex interaction between neuroendocrine factors and the kidney may underlie the propensity for some individuals to retain salt and develop salt-dependent hypertension. In this review, we focus mainly on the renal contributions that provide the mechanistic links between chronic salt intake and the development of hypertension.
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Affiliation(s)
- Dewan S A Majid
- Department of Physiology, SL39, Tulane University School of Medicine, 1430 Tulane Avenue, New Orleans, LA 70112, USA.
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Abstract
Experimental models of hypertension and patients with inappropriately increased renin formation due to a stenotic kidney, arteriosclerotic narrowing of the renal arterioles or a rare juxtaglomerular cell tumor have shown a progressive augmentation of the intrarenal/intratubular renin-angiotensin system (RAS). The increased intrarenal angiotensin II (Ang II) elicits renal vasoconstriction and enhanced tubular sodium reabsorption in proximal and distal nephron segments. The enhanced intrarenal Ang II levels are due to both increased Ang II type 1 (AT1) receptor mediated Ang II uptake and AT1 receptor dependent stimulation of renal angiotensinogen (AGT) mRNA and augmented AGT production. The increased AGT formation and secretion into the proximal tubular lumen leads to local formation of Ang II, which stimulates proximal transporters such as the sodium/hydrogen exchanger. Enhanced AGT production also leads to spillover of AGT into the distal nephron segments as reflected by AGT in the urine, which provides an index of intrarenal RAS activity. There is also increased Ang II concentration in distal nephron with stimulation of distal sodium transport. Increased urinary excretion of AGT has been demonstrated in patients with hypertension, type 1 and type 2 diabetes mellitus, and several types of chronic kidney diseases indicating an upregulation of intrarenal RAS activity.
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Affiliation(s)
- Ryousuke Satou
- Department of Physiology and the Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - Weijian Shao
- Department of Physiology and the Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA 70112, USA
| | - L Gabriel Navar
- Department of Physiology, Tulane University Health Sciences Center, SL39, 1430 Tulane Avenue, New Orleans, LA 70112, USA
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AVP-induced increase in AQP2 and p-AQP2 is blunted in heart failure during cardiac remodeling and is associated with decreased AT1R abundance in rat kidney. PLoS One 2015; 10:e0116501. [PMID: 25658446 PMCID: PMC4319737 DOI: 10.1371/journal.pone.0116501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2014] [Accepted: 12/10/2014] [Indexed: 01/02/2023] Open
Abstract
AIM The objective was to examine the renal effects of long-term increased angiotensin II and vasopressin plasma levels in early-stage heart failure (HF). We investigated the regulations of the V2 vasopressin receptor, the type 1A angiotensin II receptor, the (pro)renin receptor, and the water channels AQP2, AQP1, AQP3, and AQP4 in the inner medulla of rat kidney. METHODS HF was induced by coronary artery ligation. Sixty-eight rats were allocated to six groups: Sham (N = 11), HF (N = 11), sodium restricted sham (N = 11), sodium restricted HF (N = 11), sodium restricted sham + DDAVP (N = 12), and sodium restricted HF + DDAVP (N = 12). 1-desamino-8-D-arginine vasopressin (0.5 ng h-1 for 7 days) or vehicle was administered. Pre- and post-treatment echocardiographic evaluation was performed. The rats were sacrificed at day 17 after surgery, before cardiac remodeling in rat is known to be completed. RESULTS HF rats on standard sodium diet and sodium restriction displayed biochemical markers of HF. These rats developed hyponatremia, hypo-osmolality, and decreased fractional excretion of sodium. Increase of AQP2 and p(Ser256)-AQP2 abundance in all HF groups was blunted compared with control groups even when infused with DDAVP and despite increased vasopressin V2 receptor and Gsα abundance. This was associated with decreased protein abundance of the AT1A receptor in HF groups vs. controls. CONCLUSION Early-stage HF is associated with blunted increase in AQP2 and p(Ser256)-AQP2 despite of hyponatremia, hypo-osmolality, and increased inner medullary vasopressin V2 receptor expression. Decreased type 1A angiotensin II receptor abundance likely plays a role in the transduction of these effects.
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Effects of high and low salt intake on left ventricular remodeling after myocardial infarction in normotensive rats. ACTA ACUST UNITED AC 2015; 9:77-85. [DOI: 10.1016/j.jash.2014.11.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Revised: 11/26/2014] [Accepted: 11/30/2014] [Indexed: 12/16/2022]
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Kamat NV, Thabet SR, Xiao L, Saleh MA, Kirabo A, Madhur MS, Delpire E, Harrison DG, McDonough AA. Renal transporter activation during angiotensin-II hypertension is blunted in interferon-γ-/- and interleukin-17A-/- mice. Hypertension 2015; 65:569-76. [PMID: 25601932 DOI: 10.1161/hypertensionaha.114.04975] [Citation(s) in RCA: 163] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Ample genetic and physiological evidence establishes that renal salt handling is a critical regulator of blood pressure. Studies also establish a role for the immune system, T-cell infiltration, and immune cytokines in hypertension. This study aimed to connect immune cytokines, specifically interferon-γ (IFN-γ) and interleukin-17A (IL-17A), to sodium transporter regulation in the kidney during angiotensin-II (Ang-II) hypertension. C57BL/6J (wild-type) mice responded to Ang-II infusion (490 ng/kg per minute, 2 weeks) with a rise in blood pressure (170 mm Hg) and a significant decrease in the rate of excretion of a saline challenge. In comparison, mice that lacked the ability to produce either IFN-γ (IFN-γ(-/-)) or IL-17A (IL-17A(-/-)) exhibited a blunted rise in blood pressure (<150 mm Hg), and both the genotypes maintained baseline diuretic and natriuretic responses to a saline challenge. Along the distal nephron, Ang-II infusion increased abundance of the phosphorylated forms of the Na-K-2Cl cotransporter, Na-Cl cotransporter, and Ste20/SPS-1-related proline-alanine-rich kinase, in both the wild-type and the IL-17A(-/-) but not in IFN-γ(-/-) mice; epithelial Na channel abundance increased similarly in all the 3 genotypes. In the proximal nephron, Ang-II infusion significantly decreased abundance of Na/H-exchanger isoform 3 and the motor myosin VI in IL-17A(-/-) and IFN-γ(-/-), but not in wild-type; the Na-phosphate cotransporter decreased in all the 3 genotypes. Our results suggest that during Ang-II hypertension both IFN-γ and IL-17A production interfere with the pressure natriuretic decrease in proximal tubule sodium transport and that IFN-γ production is necessary to activate distal sodium reabsorption.
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Affiliation(s)
- Nikhil V Kamat
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Salim R Thabet
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Liang Xiao
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Mohamed A Saleh
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Annet Kirabo
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Meena S Madhur
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Eric Delpire
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - David G Harrison
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.)
| | - Alicia A McDonough
- From the Department of Cell and Neurobiology, Keck School of Medicine of USC, Los Angeles, CA (N.V.K., A.A.M.); Division of Clinical Pharmacology, Department of Medicine (S.R.T., L.X., M.A.S., A.K., M.S.M., D.G.H.) and Department of Anesthesiology (E.D.), Vanderbilt University School of Medicine, Nashville, TN; and Department of Pharmacology and Toxicology, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt (M.A.S.).
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Angiotensin II increases the expression of (pro)renin receptor during low-salt conditions. Am J Med Sci 2015; 348:416-22. [PMID: 25250989 DOI: 10.1097/maj.0000000000000335] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Evidence indicates that chronic angiotensin II (AngII) infusion increases (pro)renin receptor ((P)RR) expression in renal inner medullary collecting duct (IMCD) cells. Recently, it has been shown that renal (P)RR expression is augmented during a low-salt (LS) diet. However, the role of AngII in mediating the stimulation of (P)RR during LS conditions is unknown. We hypothesized that AngII mediates the increased expression of (P)RR during low-salt conditions in IMCDs. METHODS (P)RR expression and AngII levels were evaluated in Sprague-Dawley rats fed a LS diet (0.03% NaCl) and normal salt (NS; 0.4% NaCl) for 7 days. We examined the effects of sodium reduction (130 mM NaCl) and AngII on (P)RR expression in IMCDs isolated in hypertonic conditions (640 mOsmol/L with 280 mM NaCl). RESULTS Plasma renin activity in LS rats was significantly higher than rats fed with NS (28.1 ± 2.2 versus 6.7 ± 1.1 ng AngI·mL⁻¹·hr⁻¹; P < 0.05), as well as renin content in renal cortex and medulla. The (P)RR mRNA and protein levels were higher in medullary tissues from LS rats but did not change in the cortex. Intrarenal AngII was augmented in LS compared with NS rats (cortex: 710 ± 113 versus 277 ± 86 fmol/g, P < 0.05; medulla: 2093 ± 125 versus 1426 ± 126 fmol/g, P < 0.05). In cultured IMCDs, (P)RR expression was increased in response to LS or AngII treatment and potentiated by both treatments (both at 640 mOsmol/L). CONCLUSIONS These data indicate that (P)RR is augmented in medullary collecting ducts in response to LS and that this effect is further enhanced by the increased intrarenal AngII content.
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Cuevas CA, Gonzalez AA, Inestrosa NC, Vio CP, Prieto MC. Angiotensin II increases fibronectin and collagen I through the β-catenin-dependent signaling in mouse collecting duct cells. Am J Physiol Renal Physiol 2014; 308:F358-65. [PMID: 25411386 DOI: 10.1152/ajprenal.00429.2014] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The contribution of angiotensin II (ANG II) to renal and tubular fibrosis has been widely reported. Recent studies have shown that collecting duct cells can undergo mesenchymal transition suggesting that collecting duct cells are involved in interstitial fibrosis. The Wnt/β-catenin signaling pathway plays an essential role in development, organogenesis, and tissue homeostasis; however, the dysregulation of this pathway has been linked to fibrosis. In this study, we investigated whether AT1 receptor activation induces the expression of fibronectin and collagen I via the β-catenin pathway in mouse collecting duct cell line M-1. ANG II (10(-7) M) treatment in M-1 cells increased mRNA, protein levels of fibronectin and collagen I, the β-catenin target genes (cyclin D1 and c-myc), and the myofibroblast phenotype. These effects were prevented by candesartan, an AT1 receptor blocker. Inhibition of the β-catenin degradation with pyrvinium pamoate (pyr; 10(-9) M) prevented the ANG II-induced expression of fibronectin, collagen I, and β-catenin target genes. ANG II treatment promoted the accumulation of β-catenin protein in a time-dependent manner. Because phosphorylation of glycogen synthase kinase-3β (GSK-3β) inhibits β-catenin degradation, we further evaluated the effects of ANG II and ANG II plus pyr on p-ser9-GSK-3β levels. ANG II-dependent upregulation of β-catenin protein levels was correlated with GSK-3β phosphorylation. These effects were prevented by pyr. Our data indicate that in M-1 collecting duct cells, the β-catenin pathway mediates the stimulation of fibronectin and collagen I in response to AT1 receptor activation.
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Affiliation(s)
- Catherina A Cuevas
- Department of Physiology, Center of Aging and Regeneration CARE UC, Pontificia Universidad Católica de Chile, Santiago, Chile; Department of Cell and Molecular Biology, Center of Aging and Regeneration CARE UC, Pontificia Universidad Católica de Chile, Santiago, Chile; Department of Physiology, Tulane University, New Orleans, Louisiana; and
| | - Alexis A Gonzalez
- Instituto de Química, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Nibaldo C Inestrosa
- Department of Cell and Molecular Biology, Center of Aging and Regeneration CARE UC, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Carlos P Vio
- Department of Physiology, Center of Aging and Regeneration CARE UC, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Minolfa C Prieto
- Department of Physiology, Tulane University, New Orleans, Louisiana; and Department of Hypertension and Renal Center of Excellence, Tulane University, New Orleans, Louisiana
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Abstract
PURPOSE OF REVIEW The purpose of this review is to provide an update on the current knowledge regarding the role of the intrarenal rennin-angiotensin system (RAS) in the regulation of glomerular function including glomerular dynamics and filtration rate, glomerular permeability and structural alterations during chronic increases in intrarenal angiotensin (Ang) II. RECENT FINDINGS Recent studies have continued to delineate the complex interactions among the various RAS components that participate in regulating glomerular function. Although Ang II acting on AT1 receptors remains as the predominant influence on glomerular dynamics, some of these effects are indirectly mediated by Ang II modulating the sensitivity of the macula densa tubuloglomerular feedback mechanism as well as the more recently described feedback mechanism from the connecting tubule. Interestingly, the actions of Ang II on these systems cause opposite effects on glomerular function demonstrating the complexities associated with the influences of Ang II on glomerular function. When chronically elevated, Ang II also stimulates and/or interacts with other factors, including reactive oxygen species, cytokines and growth factors and other hormones or paracrine agents, to elicit structural alterations. SUMMARY Recent studies have provided further evidence for the presence of many components of the RAS in glomerular structures, which supports the importance of locally produced angiotensin peptides to regulate glomerular haemodynamics, filtration rate and macromolecular permeability and contribute to fibrosis and glomerular injury when inappropriately augmented.
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Deliyanti D, Armani R, Casely D, Figgett WA, Agrotis A, Wilkinson-Berka JL. Retinal vasculopathy is reduced by dietary salt restriction: involvement of Glia, ENaCα, and the renin-angiotensin-aldosterone system. Arterioscler Thromb Vasc Biol 2014; 34:2033-41. [PMID: 25012132 DOI: 10.1161/atvbaha.114.303792] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVE Neovascularization and vaso-obliteration are vision-threatening events that develop by interactions between retinal vascular and glial cells. A high-salt diet is causal in cardiovascular and renal disease, which is linked to modulation of the renin-angiotensin-aldosterone system. However, it is not known whether dietary salt influences retinal vasculopathy and if the renin-angiotensin-aldosterone system is involved. We examined whether a low-salt (LS) diet influenced vascular and glial cell injury and the renin-angiotensin-aldosterone system in ischemic retinopathy. APPROACH AND RESULTS Pregnant Sprague Dawley rats were fed LS (0.03% NaCl) or normal salt (0.3% NaCl) diets, and ischemic retinopathy was induced in the offspring. An LS diet reduced retinal neovascularization and vaso-obliteration, the mRNA and protein levels of the angiogenic factors, vascular endothelial growth factor, and erythropoietin. Microglia, which influence vascular remodeling in ischemic retinopathy, were reduced by LS as was tumor necrosis factor-α. Macroglial Müller cells maintain the integrity of the blood-retinal barrier, and in ischemic retinopathy, LS reduced their gliosis and also vascular leakage. In retina, LS reduced mineralocorticoid receptor, angiotensin type 1 receptor, and renin mRNA levels, whereas, as expected, plasma levels of aldosterone and renin were increased. The aldosterone/mineralocorticoid receptor-sensitive epithelial sodium channel alpha (ENaCα), which is expressed in Müller cells, was increased in ischemic retinopathy and reduced by LS. In cultured Müller cells, high salt increased ENaCα, which was prevented by mineralocorticoid receptor and angiotensin type 1 receptor blockade. Conversely, LS reduced ENaCα, angiotensin type 1 receptor, and mineralocorticoid receptor expression. CONCLUSIONS An LS diet reduced retinal vasculopathy, by modulating glial cell function and the retinal renin-angiotensin-aldosterone system.
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Affiliation(s)
- Devy Deliyanti
- From the Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia (D.D., R.A., W.A.F., A.A., J.L.W.-B.); and Prosearch International, Malvern, Victoria, Australia (D.C.)
| | - Roksana Armani
- From the Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia (D.D., R.A., W.A.F., A.A., J.L.W.-B.); and Prosearch International, Malvern, Victoria, Australia (D.C.)
| | - David Casely
- From the Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia (D.D., R.A., W.A.F., A.A., J.L.W.-B.); and Prosearch International, Malvern, Victoria, Australia (D.C.)
| | - William A Figgett
- From the Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia (D.D., R.A., W.A.F., A.A., J.L.W.-B.); and Prosearch International, Malvern, Victoria, Australia (D.C.)
| | - Alex Agrotis
- From the Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia (D.D., R.A., W.A.F., A.A., J.L.W.-B.); and Prosearch International, Malvern, Victoria, Australia (D.C.)
| | - Jennifer L Wilkinson-Berka
- From the Department of Immunology, Monash University, Alfred Medical Research and Education Precinct, Melbourne, Victoria, Australia (D.D., R.A., W.A.F., A.A., J.L.W.-B.); and Prosearch International, Malvern, Victoria, Australia (D.C.).
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Park JS, Kim S, Jo CH, Oh IH, Kim GH. Effects of Dietary Salt Restriction on Renal Progression and Interstitial Fibrosis in Adriamycin Nephrosis. Kidney Blood Press Res 2014; 39:86-96. [DOI: 10.1159/000355782] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/27/2014] [Indexed: 11/19/2022] Open
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Lu XM, Jin YN, Ma L. Olmesartan medoxomil reverses glomerulosclerosis in renal tissue induced by myocardial infarction without changes in renal function. Exp Ther Med 2014; 8:105-109. [PMID: 24944606 PMCID: PMC4061226 DOI: 10.3892/etm.2014.1695] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2013] [Accepted: 04/10/2014] [Indexed: 12/13/2022] Open
Abstract
The aim of the present study was to investigate the effect of olmesartan medoxomil (OLM) on renal injury in mice with myocardial infarction (MI). A total of 33 male C57/BL/6 mice were divided into a sham surgery group (SHAM group), MI group (MI group) and OLM treatment group (OLM group). Experimental MI models were established in the mice of the MI and OLM groups by coronary artery ligation, and the mice in the OLM group were fed a daily dose of 10 mg/kg OLM for eight weeks. The results showed that MI induced a reduction in cardiac function and an increase in systolic blood pressure. In addition, increased periodic acid-Schiff (PAS) positive staining, combined with increased levels of angiotensin II (Ang II) in the plasma and kidneys, and increased expression levels of renin, angiotensin II type 1 receptor (AT1R) and angiotensinogen (AGT) in the kidney tissues was observed compared with those in the SHAM group. OLM treatment attenuated the injury by reducing the systolic blood pressure and PAS positive staining, and decreasing the expression levels of Ang II, renin, AT1R and AGT in the kidney compared with those in the MI group. It may be concluded that MI activates the intrarenal renin-angiotensin system and leads to glomerulosclerosis, and that OLM protects the kidney by inhibiting the effects of Ang II.
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Affiliation(s)
- Xiao-Mei Lu
- Department of Pathophysiology, College of Basic Medical Sciences, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Yu-Nan Jin
- Department of Pathophysiology, College of Basic Medical Sciences, China Medical University, Shenyang, Liaoning 110001, P.R. China
| | - Ling Ma
- Department of Pathophysiology, College of Basic Medical Sciences, China Medical University, Shenyang, Liaoning 110001, P.R. China
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Jönsson S, Agic MB, Narfström F, Melville JM, Hultström M. Renal neurohormonal regulation in heart failure decompensation. Am J Physiol Regul Integr Comp Physiol 2014; 307:R493-7. [PMID: 24920735 DOI: 10.1152/ajpregu.00178.2014] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Decompensation in heart failure occurs when the heart fails to balance venous return with cardiac output, leading to fluid congestion and contributing to mortality. Decompensated heart failure can cause acute kidney injury (AKI), which further increases mortality. Heart failure activates signaling systems that are deleterious to kidneys such as renal sympathetic nerve activity (RSNA), renin-angiotensin-aldosterone system, and vasopressin secretion. All three reduce renal blood flow (RBF) and increase tubular sodium reabsorption, which may increase renal oxygen consumption causing AKI through renal tissue hypoxia. Vasopressin contributes to venous congestion through aquaporin-mediated water retention. Additional water retention may be mediated through vasopressin-induced medullary urea transport and hyaluronan but needs further study. In addition, there are several systems that could protect the kidneys and reduce fluid retention such as natriuretic peptides, prostaglandins, and nitric oxide. However, the effect of natriuretic peptides and nitric oxide are blunted in decompensation, partly due to oxidative stress. This review considers how neurohormonal signaling in heart failure drives fluid retention by the kidneys and thus exacerbates decompensation. It further identifies areas where there is limited data, such as signaling systems 20-HETE, purines, endothelin, the role of renal water retention mechanisms for congestion, and renal hypoxia in AKI during heart failure.
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Affiliation(s)
- Sofia Jönsson
- Unit for Integrative Physiology, Department of Medical Cellbiology, Uppsala University, Uppsala, Sweden; and
| | - Mediha Becirovic Agic
- Unit for Integrative Physiology, Department of Medical Cellbiology, Uppsala University, Uppsala, Sweden; and
| | - Fredrik Narfström
- Unit for Anaesthesiology and Intensive Care, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
| | - Jacqueline M Melville
- Unit for Integrative Physiology, Department of Medical Cellbiology, Uppsala University, Uppsala, Sweden; and
| | - Michael Hultström
- Unit for Integrative Physiology, Department of Medical Cellbiology, Uppsala University, Uppsala, Sweden; and Unit for Anaesthesiology and Intensive Care, Department of Surgical Sciences, Uppsala University, Uppsala, Sweden
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Siddique K, Guzman GL, Gattineni J, Baum M. Effect of postnatal maternal protein intake on prenatal programming of hypertension. Reprod Sci 2014; 21:1499-507. [PMID: 24740990 DOI: 10.1177/1933719114530186] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
This study examined whether postnatal maternal dietary protein deprivation during the time of nursing can program hypertension when the offspring are studied as adults. Rats were fed either a 6% or 20% protein diet during the second half of pregnancy and continued on the same diet while rats were nursing their pups. The neonates of all of the rats were cross-fostered to a different mother and studied as adults. Adult rats that had a normal prenatal environment but were reared by mothers fed a low-protein diet until weaning (20%-6%) were hypertensive, had a higher renal Na(+)-K(+)-2Cl(-) cotransporter (NKCC2) and Na(+)-Cl(-) cotransporter (NCC) protein abundance yet a comparable number of glomeruli, and had higher plasma renin and angiotensin II levels compared to control (20%-20%). Rats whose mothers were fed a 6% protein diet and cross-fostered to a different rat fed a 6% protein diet until weaning (6%-6%) were hypertensive, had elevated plasma renin and angiotensin II levels, and had a reduction in nephron number but had NKCC2 and NCC levels comparable to 20% to 20% offspring. The 6% to 20% had blood pressure and glomerular numbers comparable to 20% to 20% rats. The hypertension resulting from prenatal dietary protein deprivation can be normalized by improving the postnatal environment. Combined prenatal and postnatal maternal dietary protein deprivation and maternal dietary protein deprivation while nursing alone (20%-6%) results in hypertension, but the mechanism for the hypertension in these groups is different.
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Affiliation(s)
- Khurrum Siddique
- Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA
| | - German Lozano Guzman
- Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA
| | - Jyothsna Gattineni
- Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA
| | - Michel Baum
- Department of Pediatrics, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, USA
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Isaksson GL, Stubbe J, Lyngs Hansen P, Jensen BL, Bie P. Salt sensitivity of renin secretion, glomerular filtration rate and blood pressure in conscious Sprague-Dawley rats. Acta Physiol (Oxf) 2014; 210:446-54. [PMID: 24188244 DOI: 10.1111/apha.12191] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Revised: 10/15/2013] [Accepted: 10/30/2013] [Indexed: 12/20/2022]
Abstract
AIM We hypothesized that in normal rats in metabolic steady state, (i) the plasma renin concentration (PRC) is log-linearly related to Na(+) intake (NaI), (ii) the concurrent changes in mean arterial pressure (MABP) and glomerular filtration rate (GFR) are negligible and (iii) the function PRC = f(NaI) is altered by β₁-adrenoceptor blockade (metoprolol) and surgical renal denervation (DNX). METHODS In catheterized, conscious rats on low-Na(+) diet (0.004% Na(+)), NaI was increased by up to 120-fold, in four 3-day steps, by intravenous saline infusion. MABP was recorded continuously, PRC measured in arterial blood, and GFR estimated by inulin clearance. RESULTS Steady states were achieved within 3 days. PRC [mIU L(-1)] was log-linearly related to NaI [mmol kg(-1) day(-1)]: PRC = -9.9 log (NaI) + 22. Set point (22 mIU L(-1) at NaI = 1) and slope (9.9 mIU per decade NaI) were independent of metoprolol administration and DNX. MABP and GFR were markedly salt-sensitive: MABP [mmHg] = 4.9 log (NaI) + 99 (P < 0.01), and GFR [mL min(-1)] = 1.4 log (NaI) + 8.3 (P < 0.01). MABP increased similarly (approx. 10%, P < 0.001) irrespective of pre-treatment. Metoprolol, but not DNX, reduced MABP, HR, and GFR (all P < 0.01). Salt sensitivity of GFR was not observed in DNX rats. CONCLUSION Log-linear relations to sodium intake exist not only for PRC, but also for MABP and GFR, which per 10-fold increase in sodium intake rose by 5 mmHg and 1.4 mL min(-1) respectively. Steady-state levels of PRC appear independent of renal nerves. MABP and GFR seem markedly salt sensitive in normal rats.
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Affiliation(s)
- G. L. Isaksson
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense Denmark
| | - J. Stubbe
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense Denmark
| | - P. Lyngs Hansen
- Department of Physics, Chemistry and Pharmacy; University of Southern Denmark; Odense Denmark
| | - B. L. Jensen
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense Denmark
| | - P. Bie
- Department of Cardiovascular and Renal Research; Institute of Molecular Medicine; University of Southern Denmark; Odense Denmark
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Translational studies on augmentation of intratubular renin-angiotensin system in hypertension. Kidney Int Suppl (2011) 2013; 3:321-325. [PMID: 25019012 PMCID: PMC4089772 DOI: 10.1038/kisup.2013.67] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Various models of experimental hypertension and clinical examples of increased renin formation from a stenotic kidney or a juxtaglomerular cell tumor have shown that increased circulating angiotensin II (Ang II) stimulates the intrarenal/intratubular renin–angiotensin system (RAS) that elicits renal vasoconstriction, enhanced tubular sodium reabsorption, and progressive development of hypertension and renal injury. The enhanced intrarenal Ang II activity is due to both receptor-mediated Ang II uptake and Ang II type 1 (AT1) receptor–mediated stimulation of renal angiotensinogen (AGT) mRNA and protein by proximal tubule cells. The increased AGT secretion leads to local formation of Ang II and spillover of AGT into the distal nephron segments as reflected by increased AGT excretion in the urine, which provides an index of intrarenal RAS activity. In clinical studies, increased urinary excretion of AGT has been demonstrated in hypertension, type 1 and type 2 diabetes mellitus, and several types of chronic kidney diseases. In addition, renin secretion from principal cells of the collecting ducts is increased by AT1 receptor activation and acts on AGT from the proximal tubule to form more Ang I. Renin and/or (pro)renin activity is enhanced by binding to the (pro)renin receptor (PRR) on intercalated cells or secreted as soluble PRR contributing further to AGT cleavage, thus making more substrate available for Ang II conversion by local angiotensin-converting enzyme. The augmented intratubular Ang II concentrations together with elevated renal interstitial Ang II concentrations contribute to sustained stimulation of sodium reabsorption, vasoconstriction, development of hypertension, and progressive renal injury and fibrosis.
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Mamenko M, Zaika O, Prieto MC, Jensen VB, Doris PA, Navar LG, Pochynyuk O. Chronic angiotensin II infusion drives extensive aldosterone-independent epithelial Na+ channel activation. Hypertension 2013; 62:1111-1122. [PMID: 24060890 DOI: 10.1161/hypertensionaha.113.01797] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The inability of mineralocorticoid receptor (MR) blockade to reduce hypertension associated with high angiotensin (Ang) II suggests direct actions of Ang II to regulate tubular sodium reabsorption via the epithelial Na(+) channel (ENaC) in the aldosterone-sensitive distal nephron. We used freshly isolated aldosterone-sensitive distal nephron from mice to delineate the synergism and primacy between aldosterone and Ang II in controlling functional ENaC activity. Inhibition of MR specifically prevented the increased number of functionally active ENaC, but not ENaC open probability elicited by a low sodium diet. In contrast, we found no functional role of glucocorticoid receptors in the regulation of ENaC activity by dietary salt intake. Simultaneous inhibition of MR and Ang II type 1 receptors ameliorated the enhanced ENaC activity caused by low dietary salt intake and produced significantly greater natriuresis than either inhibitor alone. Chronic systemic Ang II infusion induced more than 2 times greater increase in ENaC activity than observed during dietary sodium restriction. Importantly, ENaC activity remained greatly above control levels during maximal MR inhibition. We conclude that during variations in dietary salt intake both aldosterone and Ang II contribute complementarily to the regulation of ENaC activity in the aldosterone-sensitive distal nephron. In contrast, in the setting of Ang II-dependent hypertension, ENaC activity is upregulated well above the physiological range and is not effectively suppressed by inhibition of the aldosterone-MR axis. This provides a mechanistic explanation for the resistance to MR inhibition that occurs in hypertensive subjects having elevated intrarenal Ang II levels.
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Affiliation(s)
- Mykola Mamenko
- Department of Integrative Biology and Pharmacology; The University of Texas Health Science Center at Houston, USA
| | - Oleg Zaika
- Department of Integrative Biology and Pharmacology; The University of Texas Health Science Center at Houston, USA
| | - Minolfa C Prieto
- Department of Physiology and Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA, USA
| | - V Behrana Jensen
- Center for Laboratory Animal Medicine and Care The University of Texas Health Science Center at Houston, USA
| | - Peter A Doris
- Institute of Molecular Medicine, The University of Texas Health Science Center at Houston, USA
| | - L Gabriel Navar
- Department of Physiology and Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA, USA
| | - Oleh Pochynyuk
- Department of Integrative Biology and Pharmacology; The University of Texas Health Science Center at Houston, USA
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