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Cirilo MAS, Santos VBS, Lima NKS, Muzi-Filho H, Paixão ADO, Vieyra A, Vieira LD. Reactive oxygen species impair Na+ transport and renal components of the renin-angiotensin-aldosterone system after paraquat poisoning. AN ACAD BRAS CIENC 2024; 96:e20230971. [PMID: 38597493 DOI: 10.1590/0001-3765202420230971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 11/14/2023] [Indexed: 04/11/2024] Open
Abstract
Paraquat (1,1'-dimethyl-4,4'-bipyridyl dichloride) is an herbicide widely used worldwide and officially banned in Brazil in 2020. Kidney lesions frequently occur, leading to acute kidney injury (AKI) due to exacerbated reactive O2 species (ROS) production. However, the consequences of ROS exposure on ionic transport and the regulator local renin-angiotensin-aldosterone system (RAAS) still need to be elucidated at a molecular level. This study evaluated how ROS acutely influences Na+-transporting ATPases and the renal RAAS. Adult male Wistar rats received paraquat (20 mg/kg; ip). After 24 h, we observed body weight loss and elevation of urinary flow and serum creatinine. In the renal cortex, paraquat increased ROS levels, NADPH oxidase and (Na++K+)ATPase activities, angiotensin II-type 1 receptors, tumor necrosis factor-α (TNF-α), and interleukin-6. In the medulla, paraquat increased ROS levels and NADPH oxidase activity but inhibited (Na++K+)ATPase. Paraquat induced opposite effects on the ouabain-resistant Na+-ATPase in the cortex (decrease) and medulla (increase). These alterations, except for increased serum creatinine and renal levels of TNF-α and interleukin-6, were prevented by 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (tempol; 1 mmol/L in drinking water), a stable antioxidant. In summary, after paraquat poisoning, ROS production culminated with impaired medullary function, urinary fluid loss, and disruption of Na+-transporting ATPases and angiotensin II signaling.
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Affiliation(s)
- Marry A S Cirilo
- Federal University of Pernambuco, Department of Physiology and Pharmacology, Professor Moraes Rego Ave., University City, 50670-901 Recife, PE, Brazil
| | - Valéria B S Santos
- Federal University of Pernambuco, Department of Physiology and Pharmacology, Professor Moraes Rego Ave., University City, 50670-901 Recife, PE, Brazil
| | - Natália K S Lima
- Federal University of Pernambuco, Department of Physiology and Pharmacology, Professor Moraes Rego Ave., University City, 50670-901 Recife, PE, Brazil
| | - Humberto Muzi-Filho
- Federal University of Rio de Janeiro, Center for Research in Precision Medicine, First Floor, Carlos Chagas Filho Institute of Biophysics, Carlos Chagas Filho Ave., University City, 21941-904 Rio de Janeiro, RJ, Brazil
- Federal University of Rio de Janeiro, National Center for Structural Biology and Bioimaging/CENABIO, 373 Carlos Chagas Filho Ave., University City, 21941-902 Rio de Janeiro, RJ, Brazil
- National Institute of Science and Technology in Regenerative Medicine-REGENERA, 373 Carlos Chagas Filho Ave., University City, 21941-902 Rio de Janeiro, RJ, Brazil
| | - Ana D O Paixão
- Federal University of Pernambuco, Department of Physiology and Pharmacology, Professor Moraes Rego Ave., University City, 50670-901 Recife, PE, Brazil
| | - Adalberto Vieyra
- Federal University of Rio de Janeiro, Center for Research in Precision Medicine, First Floor, Carlos Chagas Filho Institute of Biophysics, Carlos Chagas Filho Ave., University City, 21941-904 Rio de Janeiro, RJ, Brazil
- Federal University of Rio de Janeiro, National Center for Structural Biology and Bioimaging/CENABIO, 373 Carlos Chagas Filho Ave., University City, 21941-902 Rio de Janeiro, RJ, Brazil
- National Institute of Science and Technology in Regenerative Medicine-REGENERA, 373 Carlos Chagas Filho Ave., University City, 21941-902 Rio de Janeiro, RJ, Brazil
- Grande Rio University, 1160 Professor José de Souza Herdy Street, Building C, Second Floor, 25071-202 Duque de Caxias, RJ, Brazil
| | - Leucio D Vieira
- Federal University of Pernambuco, Department of Physiology and Pharmacology, Professor Moraes Rego Ave., University City, 50670-901 Recife, PE, Brazil
- Federal University of Rio de Janeiro, National Center for Structural Biology and Bioimaging/CENABIO, 373 Carlos Chagas Filho Ave., University City, 21941-902 Rio de Janeiro, RJ, Brazil
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Pereira-Acácio A, Veloso-Santos JPM, Nossar LF, Costa-Sarmento G, Muzi-Filho H, Vieyra A. Angiotensin-(3–4) normalizes the elevated arterial blood pressure and abnormal Na+/energy handling associated with chronic undernutrition by counteracting the effects mediated by type 1 angiotensin II receptors. PLoS One 2022; 17:e0273385. [PMID: 35984814 PMCID: PMC9390919 DOI: 10.1371/journal.pone.0273385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 08/07/2022] [Indexed: 11/24/2022] Open
Abstract
We investigated the mechanisms by which chronic administration of a multideficient diet after weaning alters bodily Na+ handling, and culminates in high systolic blood pressure (SBP) at a juvenile age. From 28 to 92 days of age, weaned male Wistar rats were given a diet with low content and poor-quality protein, and low lipid, without vitamin supplementation, which mimics the diets consumed in impoverished regions worldwide. We measured food, energy and Na+ ingestion, together with urinary Na+ excretion, Na+ density (Na+ intake/energy intake), plasma Na+ concentration, SBP, and renal proximal tubule Na+-transporting ATPases. Undernourished rats aged 92 days had only one-third of the control body mass, lower plasma albumin, higher SBP, higher energy intake, and higher positive Na+ balance accompanied by decreased plasma Na+ concentration. Losartan or Ang-(3–4) normalized SBP, and the combination of the 2 substances induced an accentuated negative Na+ balance as a result of strong inhibition of Na+ ingestion. Na+ density in undernourished rats was higher than in control, irrespective of the treatment, and they had downregulated (Na++K+)ATPase and upregulated Na+-ATPase in proximal tubule cells, which returned to control levels after Losartan or Ang-(3–4). We conclude that Na+ density, not only Na+ ingestion, plays a central role in the pathophysiology of elevated SBP in chronically undernourished rats. The observations that Losartan and Ang-(3–4) normalized SBP together with negative Na+ balance give support to the proposal that Ang II⇒AT1R and Ang II⇒AT2R axes have opposite roles within the renin-angiotensin-aldosterone system of undernourished juvenile rats.
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Affiliation(s)
- Amaury Pereira-Acácio
- Graduate Program of Translational Biomedicine/BIOTRANS, University of Grande Rio, Duque de Caxias, Brazil
- Leopoldo de Meis Institute of Medical Biochemistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - João P. M. Veloso-Santos
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Luiz F. Nossar
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gloria Costa-Sarmento
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Humberto Muzi-Filho
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Adalberto Vieyra
- Graduate Program of Translational Biomedicine/BIOTRANS, University of Grande Rio, Duque de Caxias, Brazil
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Regenerative Medicine/REGENERA, Rio de Janeiro, Brazil
- * E-mail:
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Luzes R, Muzi-Filho H, Pereira-Acácio A, Crisóstomo T, Vieyra A. Angiotensin-(3-4) modulates the overweight- and undernutrition-induced ACE2 downregulation in renal proximal tubule cells: implications for COVID-19? EXPLORATION OF MEDICINE 2021. [DOI: 10.37349/emed.2021.00038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Aim: The renal lesions–including severe acute kidney injury–are severe outcomes in severe acute respiratory syndrome coronavirus 2 infections. There are no reports regarding the influence of the nutritional status on the severity and progress of these lesions. Ageing is also an important risk factor.
Methods: In the present study we compared the influence of overweight and undernutrition on the levels of renal angiotensin converting enzymes 1 and 2 (ACE and ACE2), which were evaluated by Western blotting. Since the renin-angiotensin-aldosterone system (RAAS) has been implicated in the progress of kidney failure during coronavirus disease 2019, the influence of Angiotensin-(3-4) [Ang-(3-4)] was investigated. Ang-(3-4) is the shortest angiotensin-derived peptide, which is considered the physiological antagonist of several Ang II effects.
Results: Both overweight and undernutrition downregulate the levels of ACE2 without influence on the levels of ACE in proximal tubules from kidney rats. Administration of Ang-(3-4) upregulates ACE2 to levels above the control in overweight but not in undernourished rats.
Conclusions: Chronic undernourishment and overnourishment conditions play a central role in the renal ACE/ACE2 balance, and that the role of RAAS is also different in overweight and undernutrition.
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Affiliation(s)
- Rafael Luzes
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, 21941-170 Rio de Janeiro, Brazil 2Graduate Program of Translational Biomedicine/BIOTRANS, Unigranrio University, 25071-202 Duque de Caxias, Brazil 3National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
| | - Humberto Muzi-Filho
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, 21941-170 Rio de Janeiro, Brazil 3National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
| | - Amaury Pereira-Acácio
- Graduate Program of Translational Biomedicine/BIOTRANS, Unigranrio University, 25071-202 Duque de Caxias, Brazil 3National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
| | - Thuany Crisóstomo
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil 4Leopoldo de Meis Institute of Medical Biochemistry, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
| | - Adalberto Vieyra
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, 21941-170 Rio de Janeiro, Brazil 2Graduate Program of Translational Biomedicine/BIOTRANS, Unigranrio University, 25071-202 Duque de Caxias, Brazil 3National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, 21941-902 Rio de Janeiro, Brazil
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Lysophosphatidic acid (LPA) as a modulator of plasma membrane Ca 2+-ATPase from basolateral membranes of kidney proximal tubules. J Physiol Biochem 2021; 77:321-329. [PMID: 33704695 DOI: 10.1007/s13105-021-00800-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Accepted: 02/15/2021] [Indexed: 01/10/2023]
Abstract
Lysophosphatidic acid (LPA) acts through the activation of G protein-coupled receptors, in a Ca2+-dependent manner. We show the effects of LPA on the plasma membrane Ca2+-ATPase (PMCA) from kidney proximal tubule cells. The Ca2+-ATPase activity was inhibited by nanomolar concentrations of LPA, with maximal inhibition (~50%) obtained with 20 nM LPA. This inhibitory action on PMCA activity was blocked by Ki16425, an antagonist for LPA receptors, indicating that this lipid acts via LPA1 and/or LPA3 receptor. This effect is PKC-dependent, since it is abolished by calphostin C and U73122, PKC, and PLC inhibitors, respectively. Furthermore, the addition of 10-8 M PMA, a well-known PKC activator, mimicked PMCA modulation by LPA. We also demonstrated that the PKC activation leads to an increase in PMCA phosphorylation. These results indicate that LPA triggers LPA1 and/or LPA3 receptors at the BLM, inducing PKC-dependent phosphorylation with further inhibition of PMCA. Thus, LPA is part of the regulatory lipid network present at the BLM and plays an important role in the regulation of intracellular Ca2+ concentration that may result in significant physiological alterations in other Ca2+-dependent events ascribed to the renal tissue.
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Lima NKS, Farias WRA, Cirilo MAS, Oliveira AG, Farias JS, Aires RS, Muzi-Filho H, Paixão ADO, Vieira LD. Renal ischemia-reperfusion leads to hypertension and changes in proximal tubule Na + transport and renin-angiotensin-aldosterone system: Role of NADPH oxidase. Life Sci 2020; 266:118879. [PMID: 33310030 DOI: 10.1016/j.lfs.2020.118879] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 11/13/2020] [Accepted: 12/01/2020] [Indexed: 12/28/2022]
Abstract
Acute renal injury (AKI) is a risk factor for the development of hypertension, which involves oxidative stress, changes in Na+ handling, and the intrarenal renin-angiotensin-aldosterone system (RAAS) as underlying mechanisms. We investigated in rats whether renal ischemia-reperfusion (IR) leads to changes in the proximal tubule ATP-dependent Na+ transport and the intrarenal content of RAAS components, as well as the role of NADPH oxidase. Rats weighing 300-350 g were submitted to AKI by bilateral IR (n = 25). After IR injury, the animals were followed up for 4 weeks. One part (n = 7) received daily treatment with the NADPH oxidase inhibitor apocynin (100 mg/kg, drinking water), while another part (n = 9) received apocynin 24 h before and after IR. One group was submitted to sham surgery (n = 8). Four weeks after IR, the rats presented elevated systolic blood pressure, as well as increased lipid peroxidation, NADPH oxidase activity, (Na++K+)ATPase activity, and upregulation of type 1 angiotensin II receptor in the renal cortex. On the other hand, there was a decrease in Na+-ATPase activity and downregulation of the isoforms 1 and 2 of the angiotensin-converting enzyme, type 2 angiotensin II receptor, and of the α and ε isoforms of protein kinase C. Most of these alterations was prevented by both apocynin treatment protocols. Thus, we conclude that AKI-induced by IR may induce changes in proximal tubule ATPases and RAAS components compatible with renal Na+ retention and hypertension. These data also indicate that the NADPH oxidase represents a key factor in the origin of these alterations.
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Affiliation(s)
- Natália K S Lima
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Wilka R A Farias
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Marry A S Cirilo
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Angélica G Oliveira
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Juliane S Farias
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Regina S Aires
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Humberto Muzi-Filho
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; National Center for Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana D O Paixão
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil; National Center for Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leucio D Vieira
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil; National Center for Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
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Luzes R, Crisóstomo T, Silva PA, Iack R, de Abreu VG, Francischetti EA, Vieyra A. Angiotensin-(3-4) normalizes blood pressure, decreases Na + and energy intake, but preserves urinary Na + excretion in overweight hypertensive rats. Biochim Biophys Acta Mol Basis Dis 2020; 1867:166012. [PMID: 33212189 DOI: 10.1016/j.bbadis.2020.166012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2020] [Revised: 10/26/2020] [Accepted: 11/10/2020] [Indexed: 01/13/2023]
Abstract
Hypertension, one of the most common and severe comorbidities of obesity and overweight, is a worldwide epidemic affecting over 30% of the population. We induced overweight in young male rats (aged 58 days) by exposure to a hypercaloric high lipid (HL) diet in which 70% of the calories originated from fat. The HL diet also contained 33 or 57% higher Na+ than the control (CTR) diet. Over the following weeks the HL rats gradually became overweight (490 ± 12 g vs 427 ± 7 g in the CTR group after 15 weeks) with high visceral fat. They developed elevated systolic blood pressure (SBP) (141 ± 1.9 mmHg), which was fully restored to CTR values (128 ± 1.1 mmHg) by oral administration of Ang-(3-4) (Val-Tyr), the shortest renin-angiotensin-derived peptide. The overweight rats had lower plasma Na+ concentration that augmented to CTR values by Ang-(3-4) treatment. Na+ ingestion was depressed by 40% as result of the Ang-(3-4) treatment, whereas the urinary excretion of Na+ (UNaV) remained unmodified. The preservation of UNaV after Ang-(3-4) treatment - despite the sharp decrease in the dietary Na+ intake - can be ascribed to the normalization of renal type 1 angiotensin II receptors and Na+-transporting ATPases, both up-regulated in overweight rats. These renal effects complete a counterregulatory action on elevated renin-angiotensin activity that allows the high SBP to be normalized and body Na+ homeostasis to be restored concomitantly in overweight rats.
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Affiliation(s)
- Rafael Luzes
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Graduate Program in Translational Biomedicine, University of Grande Rio, Duque de Caxias, Brazil
| | - Thuany Crisóstomo
- Leopoldo de Meis Institute of Medical Biochemistry, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Paulo A Silva
- Graduate Program in Translational Biomedicine, University of Grande Rio, Duque de Caxias, Brazil
| | - Roxane Iack
- Graduate Program in Translational Biomedicine, University of Grande Rio, Duque de Caxias, Brazil
| | | | - Emílio A Francischetti
- Graduate Program in Translational Biomedicine, University of Grande Rio, Duque de Caxias, Brazil
| | - Adalberto Vieyra
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Graduate Program in Translational Biomedicine, University of Grande Rio, Duque de Caxias, Brazil; National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil.
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Aires RS, Vieira LD, Freitas ACN, de Lima ME, Lima NKS, Farias JS, Paixão AD. NO mediates the effect of the synthetic natriuretic peptide NPCdc on kidney and aorta in nephrectomised rats. Eur J Pharmacol 2020; 866:172780. [PMID: 31734277 DOI: 10.1016/j.ejphar.2019.172780] [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: 05/16/2019] [Revised: 10/18/2019] [Accepted: 11/04/2019] [Indexed: 12/26/2022]
Abstract
NPCdc is a synthetic natriuretic peptide that was originally derived from another peptide, the NP2_Casca, isolated from Crotalus durissus cascavella venom. These molecules share 70% structural homology with natriuretic peptides obtained from different species, including humans. NP2_Casca induces vasorelaxation and increases nitric oxide levels independently of natriuretic peptide receptors A and B. This study aimed to investigate whether NPCdc-induced hypotension in control rats and rats with a reduced kidney mass is associated with effects on the glomerular filtration rate, NADPH oxidase activity and components downstream of natriuretic peptide receptor C (NPR-C). Anaesthetized Wistar rats that were subjected to a sham operation and 5/6 nephrectomy (5/6Nx) were infused with saline (vehicle) or NPCdc (7.5 μg/kg/min) for 70 min. The NPCdc treatment decreased the mean arterial pressure and NADPH oxidase activity while simultaneously increasing the glomerular filtration rate, fractional Na+ excretion and nitric oxide level. After 70 min, the levels of p-AKT Ser-473, p-eNOS Ser-1177, p-nNOS Ser-1417 and p-iNOSTyr-151 were not affected. However, p-ERK1/2 Thr-202/Tyr-204 levels were altered. Thus, nitric oxide and components of NPR-C signalling mediate the effects of NPCdc. The results suggest a potential therapeutic application of this peptide for cardiorenal syndrome.
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Affiliation(s)
- Regina S Aires
- Departamento de Fisiologia e Farmacologia, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil
| | - Leucio D Vieira
- Departamento de Fisiologia e Farmacologia, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil
| | - Ana C N Freitas
- Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Maria E de Lima
- Departamento de Bioquímica e Imunologia, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil; Instituto de Ensino e Pesquisa da Santa Casa de Belo Horizonte, Belo Horizonte, MG, Brazil
| | - Natalia K S Lima
- Departamento de Fisiologia e Farmacologia, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil
| | - Juliane S Farias
- Departamento de Fisiologia e Farmacologia, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil
| | - Ana D Paixão
- Departamento de Fisiologia e Farmacologia, Centro de Biociências, Universidade Federal de Pernambuco, Recife, Brazil.
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Bianco M, Lopes JA, Beiral HJV, Filho JDD, Frankenfeld SP, Fortunato RS, Gattass CR, Vieyra A, Takiya CM. The contralateral kidney presents with impaired mitochondrial functions and disrupted redox homeostasis after 14 days of unilateral ureteral obstruction in mice. PLoS One 2019; 14:e0218986. [PMID: 31251767 PMCID: PMC6599136 DOI: 10.1371/journal.pone.0218986] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 06/14/2019] [Indexed: 02/07/2023] Open
Abstract
In unilateral ureteral obstruction (UUO), both oxidative stress and mitochondrial dysfunction are related to cell death. The aim of this study has been to characterize profiles of enzyme antioxidant activities and mitochondrial functioning of the contralateral (CL) compared to UUO and Sham (false-operated) kidneys of Balb/c mice. Kidneys were resected 14 days after obstruction for immunohistochemical and cortical mitochondrial functioning assays. Antioxidant enzymes activities were investigated in mitochondria and cytosol. Oxygen consumption (QO2) and formation of O2 reactive species (ROS) were assessed with pyruvate plus malate or succinate as the respiratory substrates. QO2 decreased in CL and UUO in all states using substrates for complex II, whereas it was affected only in UUO when substrates for complex I were used. Progressive decrease in mitochondrial ROS formation–in the forward and reverse pathway at complex I–correlates well with the inhibition of QO2 and, therefore, with decreased electron transfer at the level of complexes upstream of cytochrome c oxidase. CL and UUO transmembrane potential responses to ADP were impaired with succinate. Intense Ca2+-induced swelling was elicited in CL and UUO mitochondria. Important and selective differences exist in CL antioxidant enzymes with respect to either Sham or UUO kidneys: CL kidneys had increased mitochondrial glutathione peroxidase and cytosolic catalase activities, indicative of compensatory responses in the face of an early altered ROS homeostasis (as detected by 4-hydroxynonenal), and of a significant tendency to apoptosis. In CL and UUO, upregulation of nuclear (erythroid-derived 2)-like 2 transcription factor (Nrf2), as well as of cytoplasmic and nuclear Kelch-like ECH-associated protein 1 (Keap1) in opposition to decreased heme oxygenase-1 (HO-1), suggest impairment of the Nrf2/Keap1/HO-1 system. It is concluded that chronic obstruction impairs mitochondrial function in CL and UUO, preferentially affecting complex II.
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Affiliation(s)
- Mario Bianco
- Center of Experimental Surgery, Postgraduate Program in Surgical Science, Department of Surgery, School of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- * E-mail:
| | - Jarlene A. Lopes
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Hellen J. V. Beiral
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - João D. D. Filho
- Center of Experimental Surgery, Postgraduate Program in Surgical Science, Department of Surgery, School of Medicine, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Stephan P. Frankenfeld
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Rodrigo S. Fortunato
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Cerli R. Gattass
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Adalberto Vieyra
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Center for Structural Biology and Bioimaging /CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- Translational Biomedicine Program, Grande Rio University, Duque de Caxias, Brazil
| | - Christina M. Takiya
- Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Ribeiro VS, Cabral EV, Vieira LD, Aires RS, Farias JS, Muzi-Filho H, Vieyra A, Paixão AD. Perinatal α-tocopherol overload programs alterations in kidney development and renal angiotensin II signaling pathways at birth and at juvenile age: Mechanisms underlying the development of elevated blood pressure. Biochim Biophys Acta Mol Basis Dis 2018; 1864:2458-2471. [PMID: 29654944 DOI: 10.1016/j.bbadis.2018.04.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Revised: 03/26/2018] [Accepted: 04/10/2018] [Indexed: 12/15/2022]
Abstract
α-Tocopherol (α-Toc) overload increases the risk of dying in humans (E.R. Miller III et al. Meta-analysis: high-dosage vitamin E supplementation may increase all-cause mortality Ann Int Med. 142 (2005) 37-46), and overload during early development leads to elevation of blood pressure at adult life, but the mechanism(s) remains unknown. We hypothesized that α-Toc overload during organogenesis affects the renal renin angiotensin system (RAS) components and renal Na+ handling, culminating with late elevated blood pressure. Pregnant Wistar rats received α-Toc or the superoxide dismutase mimetic tempol throughout pregnancy. We evaluated components of the intrarenal renin angiotensin system in neonate and juvenile offspring: Ang II-positive cells, Ang II receptors (AT1 and AT2), linked protein kinases, O2- production, NADPH oxidase abundance, lipid peroxidation and activity of Na+-transporting ATPases. In juvenile offspring we followed the evolution of arterial blood pressure. Neonates from α-Toc and tempol mothers presented with accentuated retardment in tubular development, pronounced decrease in glomerular Ang II-positive cells and AT1/AT2 ratio, intense production of O2- and upregulation of the α, ε and λ PKC isoforms. α-Toc decreased or augmented the abundance of renal (Na++K+)ATPase depending on the age and α-Toc dose. In juvenile rats the number of Ang II-positive cells returned to control values as well as PKCα, but co-existing with marked upregulation in the activity of (Na++K+) and Na+-ATPase and elevated arterial pressure at 30 days. We conclude that the mechanisms of these alterations rely on selective targeting of renal RAS components through genic and pro-oxidant effects of the vitamin.
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Affiliation(s)
- Valdilene S Ribeiro
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Edjair V Cabral
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil; National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil
| | - Leucio D Vieira
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil; National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil
| | - Regina S Aires
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Juliane S Farias
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil
| | - Humberto Muzi-Filho
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil; Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil; National Institute in Science and Technology for Regenerative Medicine, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil
| | - Adalberto Vieyra
- National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil; Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil; National Institute in Science and Technology for Regenerative Medicine, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil; Graduate Program in Translational Biomedicine, Grande Rio University, Duque de Caxias 25071-202, Rio de Janeiro, Brazil
| | - Ana D Paixão
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife 50670-901, Pernambuco, Brazil; National Center of Structural Biology and Bioimaging/CENABIO, Federal University of Rio de Janeiro, Rio de Janeiro 21941-902, Rio de Janeiro, Brazil.
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10
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Sampaio LS, da Silva PA, Ribeiro VS, Castro-Chaves C, Lara LS, Vieyra A, Einicker-Lamas M. Bioactive lipids are altered in the kidney of chronic undernourished rats: is there any correlation with the progression of prevalent nephropathies? Lipids Health Dis 2017; 16:245. [PMID: 29246161 PMCID: PMC5732436 DOI: 10.1186/s12944-017-0634-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 12/03/2017] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Undernutrition during childhood leads to chronic diseases in adult life including hypertension, diabetes and chronic kidney disease. Here we explore the hypothesis that physiological alterations in the bioactive lipids pattern within kidney tissue might be involved in the progression of chronic kidney disease. METHODS Membrane fractions from kidney homogenates of undernourished rats (RBD) were submitted to lipid extraction and analysis by thin layer chromatography and cholesterol determination. RESULTS Kidneys from RBD rats had 25% lower cholesterol content, which disturb membrane microdomains, affecting Ca2+ homeostasis and the enzymes responsible for important lipid mediators such as phosphatidylinositol-4 kinase, sphingosine kinase, diacylglicerol kinase and phospholipase A2. We observed a decrease in phosphatidylinositol(4)-phosphate (8.8 ± 0.9 vs. 3.6 ± 0.7 pmol.mg-1.mim-1), and an increase in phosphatidic acid (2.2 ± 0.8 vs. 3.8 ± 1.3 pmol.mg-1.mim-1), being these lipid mediators involved in the regulation of key renal functions. Ceramide levels are augmented in kidney tissue from RBD rats (18.7 ± 1.4 vs. 21.7 ± 1.5 fmol.mg-1.min-1) indicating an ongoing renal lesion. CONCLUSION Results point to an imbalance in the bioactive lipid generation with further consequences to key events related to kidney function, thus contributing to the establishment of chronic kidney disease.
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Affiliation(s)
- Luzia S Sampaio
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil
| | - Paulo A da Silva
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil
- Programa de Pós-Graduação em Biomedicina Translacional, Universidade do Grande Rio, Duque de Caxias, RJ, Brazil
| | | | | | - Lucienne S Lara
- Instituto de Ciências Biomédicas, UFRJ, Rio de Janeiro, RJ, Brazil
| | - Adalberto Vieyra
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil
- Programa de Pós-Graduação em Biomedicina Translacional, Universidade do Grande Rio, Duque de Caxias, RJ, Brazil
- Centro Nacional de Biologia Estrutural e Bioimagem (CENABIO), UFRJ, Rio de Janeiro, Brazil
| | - M Einicker-Lamas
- Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Rio de Janeiro, RJ, Brazil.
- Present Address: Laboratório de Biomembranas, Sala G1-037, Bloco G, Instituto de Biofísica Carlos Chagas Filho - CCS, UFRJ, Ilha do Fundão, Rio de Janeiro, RJ, 21941-902, Brazil.
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11
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Silva-Filho JL, Peruchetti DB, Moraes-Santos F, Landgraf SS, Silva LS, Sirtoli GM, Zamith-Miranda D, Takiya CM, Pinheiro AAS, Diaz BL, Caruso-Neves C. Group V Secretory Phospholipase A2 Is Involved in Tubular Integrity and Sodium Handling in the Kidney. PLoS One 2016; 11:e0147785. [PMID: 26820468 PMCID: PMC4731149 DOI: 10.1371/journal.pone.0147785] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 01/10/2016] [Indexed: 01/08/2023] Open
Abstract
Group V (GV) phospholipase A2 (PLA2) is a member of the family of secreted PLA2 (sPLA2) enzymes. This enzyme has been identified in several organs, including the kidney. However, the physiologic role of GV sPLA2 in the maintenance of renal function remains unclear. We used mice lacking the gene encoding GV sPLA2 (Pla2g5−/−) and wild-type breeding pairs in the experiments. Mice were individually housed in metabolic cages and 48-h urine was collected for biochemical assays. Kidney samples were evaluated for glomerular morphology, renal fibrosis, and expression/activity of the (Na+ + K+)-ATPase α1 subunit. We observed that plasma creatinine levels were increased in Pla2g5−/− mice following by a decrease in creatinine clearance. The levels of urinary protein were higher in Pla2g5−/− mice than in the control group. Markers of tubular integrity and function such as γ-glutamyl transpeptidase, lactate dehydrogenase, and sodium excretion fraction (FENa+) were also increased in Pla2g5−/− mice. The increased FENa+ observed in Pla2g5−/− mice was correlated to alterations in cortical (Na+ + K+) ATPase activity/ expression. In addition, the kidney from Pla2g5−/− mice showed accumulation of matrix in corticomedullary glomeruli and tubulointerstitial fibrosis. These data suggest GV sPLA2 is involved in the maintenance of tubular cell function and integrity, promoting sodium retention through increased cortical (Na+ + K+)-ATPase expression and activity.
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Affiliation(s)
- João Luiz Silva-Filho
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Diogo Barros Peruchetti
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Felipe Moraes-Santos
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Sharon Schilling Landgraf
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Instituto Federal de Educação, Ciência e Tecnologia, Rio de Janeiro, RJ, Brazil
| | - Leandro Souza Silva
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Gabriela Modenesi Sirtoli
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Daniel Zamith-Miranda
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Christina Maeda Takiya
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Ana Acacia Sá Pinheiro
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Instituto Nacional para Pesquisa Translacional em Saúde e Ambiente na Região Amazônica, Conselho Nacional de Desenvolvimento Científico e Tecnológico/MCT, Rio de Janeiro, RJ, Brazil
| | - Bruno Lourenço Diaz
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Celso Caruso-Neves
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Instituto Nacional de Ciência e Tecnologia em Biologia e Bioimagem, Rio de Janeiro, RJ, Brazil
- * E-mail:
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12
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Altered signaling pathways linked to angiotensin II underpin the upregulation of renal Na(+)-ATPase in chronically undernourished rats. Biochim Biophys Acta Mol Basis Dis 2014; 1842:2357-66. [PMID: 25283821 DOI: 10.1016/j.bbadis.2014.09.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 09/17/2014] [Accepted: 09/30/2014] [Indexed: 01/23/2023]
Abstract
This study has investigated the participation of altered signaling linked to angiotensin II (Ang II) that could be associated with increased Na(+) reabsorption in renal proximal tubules during chronic undernutrition. A multideficient chow for rats (basic regional diet, BRD) was used, which mimics several human diets widely taken in developing countries. The Vmax of the ouabain-resistant Na(+)-ATPase resident in the basolateral membranes increased >3-fold (P<0.001) accompanied by an increase in Na(+) affinity from 4.0 to 0.2mM (P<0.001). BRD rats had a >3-fold acceleration of the formation of phosphorylated intermediates in the early stage of the catalytic cycle (in the E1 conformation) (P<0.001). Immunostaining showed a huge increase in Ang II-positive cells in the cortical tubulointerstitium neighboring the basolateral membranes (>6-fold, P<0.001). PKC isoforms (α, ε, λ, ζ), Ang II type 1 receptors and PP2A were upregulated in BRD rats (in %): 55 (P<0.001); 35 (P<0.01); 125, 55, 11 and 30 (P<0.001). PKA was downregulated by 55% (P<0.001). With NetPhosK 1.0 and NetPhos 2.0, we detected 4 high-score (>0.70) regulatory phosphorylation sites for PKC and 1 for PKA in the primary sequence of the Na(+)-ATPase α-subunit, which are located in domains that are key for Na(+) binding and catalysis. Therefore, chronic undernutrition stimulates tubulointerstitial activity of Ang II and impairs PKC- and PKA-mediated regulatory phosphorylation, which culminates in an exaggerated Na(+) reabsorption across the proximal tubular epithelium.
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13
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Silva PA, Monnerat-Cahli G, Pereira-Acácio A, Luzardo R, Sampaio LS, Luna-Leite MA, Lara LS, Einicker-Lamas M, Panizzutti R, Madeira C, Vieira-Filho LD, Castro-Chaves C, Ribeiro VS, Paixão ADO, Medei E, Vieyra A. Mechanisms involving Ang II and MAPK/ERK1/2 signaling pathways underlie cardiac and renal alterations during chronic undernutrition. PLoS One 2014; 9:e100410. [PMID: 24983243 PMCID: PMC4077653 DOI: 10.1371/journal.pone.0100410] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 05/27/2014] [Indexed: 02/07/2023] Open
Abstract
Background Several studies have correlated protein restriction associated with other nutritional deficiencies with the development of cardiovascular and renal diseases. The driving hypothesis for this study was that Ang II signaling pathways in the heart and kidney are affected by chronic protein, mineral and vitamin restriction. Methodology/Principal Findings Wistar rats aged 90 days were fed from weaning with either a control or a deficient diet that mimics those used in impoverished regions worldwide. Such restriction simultaneously increased ouabain-insensitive Na+-ATPase and decreased (Na++K+)ATPase activity in the same proportion in cardiomyocytes and proximal tubule cells. Type 1 angiotensin II receptor (AT1R) was downregulated by that restriction in both organs, whereas AT2R decreased only in the kidney. The PKC/PKA ratio increased in both tissues and returned to normal values in rats receiving Losartan daily from weaning. Inhibition of the MAPK pathway restored Na+-ATPase activity in both organs. The undernourished rats presented expanded plasma volume, increased heart rate, cardiac hypertrophy, and elevated systolic pressure, which also returned to control levels with Losartan. Such restriction led to electrical cardiac remodeling represented by prolonged ventricular repolarization parameters, induced triggered activity, early after-depolarization and delayed after-depolarization, which were also prevented by Losartan. Conclusion/Significance The mechanisms responsible for these alterations are underpinned by an imbalance in the PKC- and PKA-mediated pathways, with participation of angiotensin receptors and by activation of the MAPK/ERK1/2 pathway. These cellular and molecular alterations culminate in cardiac electric remodeling and in the onset of hypertension in adulthood.
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Affiliation(s)
- Paulo A. Silva
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Gustavo Monnerat-Cahli
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Amaury Pereira-Acácio
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Ricardo Luzardo
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Luzia S. Sampaio
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Marcia A. Luna-Leite
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Lucienne S. Lara
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marcelo Einicker-Lamas
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Rogério Panizzutti
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Caroline Madeira
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leucio D. Vieira-Filho
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Carmen Castro-Chaves
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Valdilene S. Ribeiro
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Ana D. O. Paixão
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
| | - Emiliano Medei
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
| | - Adalberto Vieyra
- Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
- National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro, Brazil
- * E-mail:
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14
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Renal molecular mechanisms underlying altered Na+ handling and genesis of hypertension during adulthood in prenatally undernourished rats. Br J Nutr 2014; 111:1932-44. [PMID: 24661554 DOI: 10.1017/s0007114513004236] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In the present study, we investigated the development of hypertension in prenatally undernourished adult rats, including the mechanisms that culminate in dysfunctions of molecular signalling in the kidney. Dams were fed a low-protein multideficient diet throughout gestation with or without α-tocopherol during lactation. The time course of hypertension development followed in male offspring was correlated with alterations in proximal tubule Na+-ATPase activity, expression of angiotensin II (Ang II) receptors, and activity of protein kinases C and A. After the establishment of hypertension, Ang II levels, cyclo-oxygenase 2 (COX-2) and NADPH oxidase subunit expression, lipid peroxidation and macrophage infiltration were examined in renal tissue. Lipid peroxidation in undernourished rats, which was very intense at 60 d, decreased at 90 d and returned to control values by 150 d. During the prehypertensive phase, prenatally undernourished rats exhibited elevated renal Na+-ATPase activity, type 2 Ang II receptor down-regulation and altered protein kinase A:protein kinase C ratio. Stable late hypertension coexisted with highly elevated levels of Ang II-positive cells in the cortical tubulointerstitium, enhanced increase in the expression of p47phox (NADPH oxidase regulatory subunit), marked down-regulation of COX-2 expression, expanded plasma volume and decreased creatinine clearance. These alterations were reduced when the dams were given α-tocopherol during lactation. The offspring of well-nourished dams treated with α-tocopherol exhibited most of the alterations encountered in the offspring of undernourished dams not treated with α-tocopherol. Thus, alterations in proximal tubule Na+ transport, subcellular signalling pathways and reactive oxygen species handling in renal tissue underpin the development of hypertension.
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15
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Lemos T, Verdoorn KS, Nogaroli L, Britto-Borges T, Bonilha TA, Moreno PA, Silva OF, Tortelote GG, Einicker-Lamas M. Biphasic regulation of type II phosphatidylinositol-4 kinase by sphingosine: Cross talk between glycero- and sphingolipids in the kidney. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:1003-9. [DOI: 10.1016/j.bbamem.2013.12.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2013] [Revised: 12/09/2013] [Accepted: 12/12/2013] [Indexed: 10/25/2022]
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16
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Dias J, Ferrão FM, Axelband F, Carmona AK, Lara LS, Vieyra A. ANG-(3-4) inhibits renal Na+-ATPase in hypertensive rats through a mechanism that involves dissociation of ANG II receptors, heterodimers, and PKA. Am J Physiol Renal Physiol 2014; 306:F855-63. [PMID: 24523384 DOI: 10.1152/ajprenal.00488.2013] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The physiological roles of ANG-(3-4) (Val-Tyr), a potent ANG II-derived peptide, remain largely unknown. The present study 1)investigates whether ANG-(3-4) modulates ouabain-resistant Na(+)-ATPase resident in proximal tubule cells and 2) verifies whether its possible action on pumping activity, considered the fine tuner of Na(+) reabsorption in this nephron segment, depends on blood pressure. ANG-(3-4) inhibited Na(+)-ATPase activity in membranes of spontaneously hypertensive rats (SHR) at nanomolar concentrations, with no effect in Wistar-Kyoto (WKY) rats or on Na(+)-K(+)-ATPase. PD123319 (10(-7) M) and PKA(5-24) (10(-6) M), an AT2 receptor (AT2R) antagonist and a specific PKA inhibitor, respectively, abrogated this inhibition, indicating that AT2R and PKA are central in this pathway. Despite the lack of effect of ANG-(3-4) when assayed alone in WKY rats, the peptide (10(-8) M) completely blocked stimulation of Na(+)-ATPase induced by 10(-10) M ANG II in normotensive rats through a mechanism that also involves AT2R and PKA. Tubular membranes from WKY rats had higher levels of AT2R/AT1R heterodimers, which remain associated in 10(-10) M ANG II and dissociate to a very low dimerization state upon addition of 10(-8) M ANG-(3-4). This lower level of heterodimers was that found in SHR, and heterodimers did not dissociate when the same concentration of ANG-(3-4) was present. Oral administration of ANG-(3-4) (50 mg/kg body mass) increased urinary Na(+) concentration and urinary Na(+) excretion with a simultaneous decrease in systolic arterial pressure in SHR, but not in WKY rats. Thus the influence of ANG-(3-4) on Na(+) transport and its hypotensive action depend on receptor association and on blood pressure.
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Affiliation(s)
- Juliana Dias
- Carlos Chagas Filho Institute of Biophysics, Federal Univ. of Rio de Janeiro and National Institute of Science and Technology for Structural Biology and Bioimaging, Rio de Janeiro 21941-902, Brazil.
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Oliveira FST, Vieira-Filho LD, Cabral EV, Sampaio LS, Silva PA, Carvalho VCO, Vieyra A, Einicker-Lamas M, Lima VLM, Paixão ADO. Reduced cholesterol levels in renal membranes of undernourished rats may account for urinary Na+ loss. Eur J Nutr 2012; 52:1233-42. [DOI: 10.1007/s00394-012-0434-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2012] [Accepted: 07/30/2012] [Indexed: 01/11/2023]
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Overexpression of HGF transgene attenuates renal inflammatory mediators, Na(+)-ATPase activity and hypertension in spontaneously hypertensive rats. Biochim Biophys Acta Mol Basis Dis 2012; 1822:1590-9. [PMID: 22713485 DOI: 10.1016/j.bbadis.2012.06.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 06/10/2012] [Accepted: 06/11/2012] [Indexed: 12/24/2022]
Abstract
Renal inflammation and oxidative stress are constantly present in experimental hypertension. Since the spontaneously hypertensive rat (SHR) has reduced levels of hepatocyte growth factor (HGF), which suppresses the activation of the proinflammatory nuclear transcription factor kappa B (NF-κB), we speculated that HGF deficiency could play a key role in the pathogenesis of hypertension in the SHR. To test this hypothesis we increased HGF in the SHR by HGF gene delivery. We found that kidneys of 15-week-old SHR had an important reduction in HGF mRNA and protein expression. Adult SHRs were randomly assigned to receive weekly hydrodynamic injection (1mg/kg) of a naked plasmid containing human HGF (hHGF) gene associated with a cytomegalovirus promoter (pCMV-HGF) or empty vector (pcDNA3.1) during 6weeks. WKY rats treated with pcDNA3.1 and pCMV-HGF served as controls. The kidneys in the hypertensive SHR untreated and treated with the empty vector had increased NF-κB activation, elevated mRNA and protein expression of RANTES, MCP-1 and IL-6 and increased oxidative stress. Activity of Na(+)-ATPase was increased while activity of Na(+), K(+)-ATPase was normal. hHGF gene therapy normalized renal NF-κB activity, proinflammatory cytokines, antioxidant status (GSH, SOD and CAT), Na(+)-ATPase activity, reduced renal injury and ameliorated hypertension. Our results suggest that reduction in HGF production plays a major role in the pathogenesis of hypertension in the SHR and increasing HGF is a potential therapeutic target in the treatment of hypertension.
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Metabolic programming during lactation stimulates renal Na+ transport in the adult offspring due to an early impact on local angiotensin II pathways. PLoS One 2011; 6:e21232. [PMID: 21747933 PMCID: PMC3128598 DOI: 10.1371/journal.pone.0021232] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Accepted: 05/24/2011] [Indexed: 12/21/2022] Open
Abstract
Background Several studies have correlated perinatal malnutrition with diseases in adulthood, giving support to the programming hypothesis. In this study, the effects of maternal undernutrition during lactation on renal Na+-transporters and on the local angiotensin II (Ang II) signaling cascade in rats were investigated. Methodology/Principal Findings Female rats received a hypoproteic diet (8% protein) throughout lactation. Control and programmed offspring consumed a diet containing 20% protein after weaning. Programming caused a decrease in the number of nephrons (35%), in the area of the Bowman's capsule (30%) and the capillary tuft (30%), and increased collagen deposition in the cortex and medulla (by 175% and 700%, respectively). In programmed rats the expression of (Na++K+)ATPase in proximal tubules increased by 40%, but its activity was doubled owing to a threefold increase in affinity for K+. Programming doubled the ouabain-insensitive Na+-ATPase activity with loss of its physiological response to Ang II, increased the expression of AT1 and decreased the expression of AT2 receptors), and caused a pronounced inhibition (90%) of protein kinase C activity with decrease in the expression of the α (24%) and ε (13%) isoforms. Activity and expression of cyclic AMP-dependent protein kinase decreased in the same proportion as the AT2 receptors (30%). In vivo studies at 60 days revealed an increased glomerular filtration rate (GFR) (70%), increased Na+ excretion (80%) and intense proteinuria (increase of 400% in protein excretion). Programmed rats, which had normal arterial pressure at 60 days, became hypertensive by 150 days. Conclusions/Significance Maternal protein restriction during lactation results in alterations in GFR, renal Na+ handling and in components of the Ang II-linked regulatory pathway of renal Na+ reabsorption. At the molecular level, they provide a framework for understanding how metabolic programming of renal mechanisms contributes to the onset of hypertension in adulthood.
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Landgraf SS, Wengert M, Silva JS, Zapata-Sudo G, Sudo RT, Takiya CM, Pinheiro AAS, Caruso-Neves C. Changes in angiotensin receptors expression play a pivotal role in the renal damage observed in spontaneously hypertensive rats. Am J Physiol Renal Physiol 2011; 300:F499-510. [DOI: 10.1152/ajprenal.00384.2010] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The renal renin-angiotensin system plays a central role in the development of hypertension. The aim of this work was to verify the expression of angiotensin II receptors AT1R and AT2R in the microsomal fraction of renal cortex and correlate this with the development of hypertension and renal damage in spontaneously hypertensive rats (SHR) using Wistar-Kyoto rats (WKY) as controls. AT1R expression increased (126%) and AT2R expression decreased (66%) in 4-wk-old SHR; AT2 expression decreased in 14-wk-old SHR (61%) compared with respective age-matched WKY. These modifications were correlated to the increase in protein kinase C activity and decrease in protein kinase A activity. Four-week-old SHR showed large accumulations of macrophages in kidney glomerulus and the tubulointerstitial area, dense cortical collagen deposition, and arterial proliferative changes in the walls of arterioles and medium-sized vessels. Similar modifications were also observed in 14-wk-old SHR. Four-week-old SHR treated with losartan (30 mg·kg−1·day−1) or hydralazine (15 and 30 mg·kg−1·day−1) by gavage for 10 wk did not develop hypertension. The decrease in AT2R expression and renal damage observed in SHR remained even after treatment with hydralazine. On the other hand, losartan treatment prevented the modifications observed in 14-wk-old SHR, indicating that renal injuries are caused specifically by AT1 rather than an increase in blood pressure. Our results indicate that the imbalance in AT1R and AT2R expression is associated with an inflammatory process that contributes to renal injury in adult SHR and to the development of hypertension.
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Affiliation(s)
- Sharon S. Landgraf
- Instituto de Biofísica Carlos Chagas Filho, Instituto Nacional de Ciência e Tecnologia em Biologia e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro
| | - Mira Wengert
- Instituto de Biofísica Carlos Chagas Filho, Instituto Nacional de Ciência e Tecnologia em Biologia e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro
- Instituto Federal de Educação, Ciência e Tecnologia, Rio de Janeiro; and
| | - Jaqueline S. Silva
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gisele Zapata-Sudo
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Roberto T. Sudo
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Christina Maeda Takiya
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Ana Acacia S. Pinheiro
- Instituto de Biofísica Carlos Chagas Filho, Instituto Nacional de Ciência e Tecnologia em Biologia e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro
| | - Celso Caruso-Neves
- Instituto de Biofísica Carlos Chagas Filho, Instituto Nacional de Ciência e Tecnologia em Biologia e Bioimagem, Universidade Federal do Rio de Janeiro, Rio de Janeiro
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Vieira-Filho LD, Lara LS, Silva PA, Santos FT, Luzardo R, Oliveira FS, Paixão AD, Vieyra A. Placental malnutrition changes the regulatory network of renal Na-ATPase in adult rat progeny: Reprogramming by maternal α-tocopherol during lactation. Arch Biochem Biophys 2011; 505:91-7. [DOI: 10.1016/j.abb.2010.09.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 09/20/2010] [Accepted: 09/25/2010] [Indexed: 11/27/2022]
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Vives D, Farage S, Motta R, Lopes AG, Caruso-Neves C. Atrial natriuretic peptides and urodilatin modulate proximal tubule Na(+)-ATPase activity through activation of the NPR-A/cGMP/PKG pathway. Peptides 2010; 31:903-8. [PMID: 20206222 DOI: 10.1016/j.peptides.2010.02.018] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/11/2010] [Revised: 02/22/2010] [Accepted: 02/22/2010] [Indexed: 01/11/2023]
Abstract
The signaling pathway mediating modulation of Na(+)-ATPase of proximal tubule cells by atrial natriuretic peptides (ANP) and urodilatin through receptors located in luminal and basolateral membranes (BLM) is investigated. In isolated BLM, 10(-11)M ANP or 10(-11)M urodilatin inhibited the enzyme activity (50%). Immunodetection revealed the presence of NPR-A in BLM and LLC-PK1 cells. Both compounds increased protein kinase G (PKG) activity (80%) and this effect did not occur with 10(-6)M LY83583, a specific inhibitor of guanylyl cyclase. The inhibitory effect of these peptides on Na(+)-ATPase activity did not occur after addition of 10(-6)M KT5823, a specific inhibitor of PKG. LLC-PK1 cells were used to investigate if ANP and urodilatin change the activity of sodium pumps by luminal receptor interaction. ANP and urodilatin inhibited Na(+)-ATPase activity (50%), with maximal effect at 10(-10)M, similar to 10(-7)M db-cGMP, and did not occur with 10(-7)M LY83583, a guanylyl cyclase inhibitor. ANP and urodilatin specifically inhibit Na(+)-ATPase activity by activation of the cGMP/PKG pathway through NPR-A located in luminal membrane and BLM, increasing understanding of the mechanism of natriuretic peptides on renal sodium excretion, with proximal tubule Na(+)-ATPase one possible target.
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Affiliation(s)
- Diogo Vives
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-bloco G, 21941-902 Rio de Janeiro, RJ, Brazil
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Lara LS, Vives D, Correa JS, Cardozo FP, Marques-Fernades MF, Lopes AG, Caruso-Neves C. PKA-mediated effect of MAS receptor in counteracting angiotensin II-stimulated renal Na+-ATPase. Arch Biochem Biophys 2010; 496:117-22. [PMID: 20153712 DOI: 10.1016/j.abb.2010.02.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2010] [Revised: 02/09/2010] [Accepted: 02/09/2010] [Indexed: 12/16/2022]
Abstract
We showed previously that angiotensin-(1-7) [Ang-(1-7)] reversed stimulation of proximal tubule Na+-ATPase promoted by angiotensin II (Ang II) through a D-ala(7)-Ang-(1-7) (A779)-sensitive receptor. Here we investigated the signaling pathway coupled to this receptor. According to our data, Ang-(1-7) produces a MAS-mediated reversal of Ang II-stimulated Na+-ATPase by a Gs/PKA pathway because: (1) the Ang-(1-7) effect is reversed by GDPbetaS, an inhibitor of trimeric G protein and Gs polyclonal antibody. Cholera toxin, an activator of Gs protein, mimicked it; (2) in the presence of Ang II, Ang-(1-7) increased the PKA activity 10-fold; (3) the peptide inhibitor of PKA blocked the Ang-(1-7) effect on Ang II-stimulated Na+-ATPase; (4) Ang-(1-7) reverses the Ang II-stimulated PKC activity; (5) cAMP mimicked the Ang-(1-7) effect on the Ang II-stimulated Na+-ATPase. Our results provide new understanding about the signaling mechanisms coupled to MAS receptor-mediated renal Ang-(1-7) effects.
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Affiliation(s)
- Lucienne S Lara
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, CCS-bloco J, 21941-590 Rio de Janeiro, RJ, Brazil
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Axelband F, Dias J, Miranda F, Ferrão FM, Barros NM, Carmona AK, Lara LS, Vieyra A. A scrutiny of the biochemical pathways from Ang II to Ang-(3-4) in renal basolateral membranes. ACTA ACUST UNITED AC 2009; 158:47-56. [PMID: 19703499 DOI: 10.1016/j.regpep.2009.08.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2009] [Revised: 08/06/2009] [Accepted: 08/16/2009] [Indexed: 12/15/2022]
Abstract
In a previous paper we demonstrated that Ang-(3-4) counteracts inhibition of the Ca(2+)-ATPase by Ang II in the basolateral membranes of kidney proximal tubules cells (BLM). We have now investigated the enzymatic routs by which Ang II is converted to Ang-(3-4). Membrane-bound angiotensin converting enzyme, aminopeptidases and neprilysin were identified using fluorescent substrates. HPLC showed that Plummer's inhibitor but not Z-pro-prolinal blocks Ang II metabolism, suggesting that carboxypeptidase N catalyzes the conversion Ang II--> Ang-(1-7). Different combinations of bestatin, thiorphan, Plummer's inhibitor, Ang II and Ang-(1-5), and use of short proteolysis times, indicate that Ang-(1-7)--> Ang-(1-5)--> Ang-(1-4)--> Ang-(3-4) is a major route. When Ang III was combined with the same inhibitors, the following pathway was demonstrated: Ang III--> Ang IV--> Ang-(3-4). Ca(2+)-ATPase assays with different Ang II concentrations and different peptidase inhibitors confirm the existence of these pathways in BLM and show that a prolyl-carboxypeptidase may be an alternative catalyst for converting Ang II to Ang-(1-7). Overall, we demonstrated that BLM have all the peptidase machinery required to produce Ang-(3-4) in the vicinity of the Ca(2+)-ATPase, enabling a local RAS axis to effect rapid modulation of active Ca(2+) fluxes.
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Affiliation(s)
- Flavia Axelband
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Na(+)-ATPase in spontaneous hypertensive rats: possible AT(1) receptor target in the development of hypertension. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1798:360-6. [PMID: 19560439 DOI: 10.1016/j.bbamem.2009.06.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2009] [Revised: 06/16/2009] [Accepted: 06/19/2009] [Indexed: 01/01/2023]
Abstract
Clinical and experimental data show an increase in sodium reabsorption on the proximal tubule (PT) in essential hypertension. It is well known that there is a link between essential hypertension and renal angiotensin II (Ang II). The present study was designed to examine ouabain-insensitive Na(+)-ATPase activity and its regulation by Ang II in spontaneously hypertensive rats (SHR). We observed that Na(+)-ATPase activity was enhanced in 14-week-old but not in 6-week-old SHR. The addition of Ang II from 10(-12) to 10(-6) mol/L decreased the enzyme activity in SHR to a level similar to that obtained in WKY. The Ang II inhibitory effect was completely reversed by a specific antagonist of AT(2) receptor, PD123319 (10(-8) mol/L) indicating that a system leading to activation of the enzyme in SHR is inhibited by AT(2)-mediated Ang II. Treatment of SHR with losartan for 10 weeks (weeks 4-14) prevents the increase in Na(+)-ATPase activity observed in 14-week-old SHR. These results indicate a correlation between AT(1) receptor activation in SHR and increased ouabain-insensitive Na(+)-ATPase activity. Our results open new possibilities towards our understanding of the pathophysiological mechanisms involved in the increased sodium reabsorption in PT found in essential hypertension.
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Vieira-Filho LD, Lara LS, Silva PA, Luzardo R, Einicker-Lamas M, Cardoso HD, Paixão ADO, Vieyra A. Placental oxidative stress in malnourished rats and changes in kidney proximal tubule sodium ATPases in offspring. Clin Exp Pharmacol Physiol 2009; 36:1157-63. [PMID: 19473191 DOI: 10.1111/j.1440-1681.2009.05212.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
1. Intrauterine malnutrition has been linked to the development of adult cardiovascular and renal diseases, which are related to altered Na(+) balance. Here we investigated whether maternal malnutrition increases placental oxidative stress with subsequent impact on renal ATP-dependent Na(+) transporters in the offspring. 2. Maternal malnutrition was induced in rats during pregnancy by using a basic regional diet available in north-eastern Brazil. Placental oxidative stress was evaluated by measuring thiobarbituric acid-reactive substances, which were 35-40% higher in malnourished dams (MalN). Na(+) pumps were evaluated in control and prenatally malnourished rats (at 25 and 90 days of age). 3. Identical Na(+)/K(+)-ATPase activity was found in both groups at 25 days (approximately 150 nmol P(i)/mg per min). However, although Na(+)/K(+)-ATPase increased by 40% with growth in control rats, it remained constant in pups from MalN. 4. In juvenile rats, the activity of the ouabain-insensitive Na(+)-ATPase was higher in MalN than in controls (70 vs 25 nmol P(i)/mg per min). Nevertheless, activity did not increase with kidney and body growth: at 90 days, it was 50% lower in MalN than in controls. The maximal stimulation of the Na(+)-ATPase by angiotensin (Ang) II was 35% lower in MalN than in control rats and was attained only with a much higher concentration of the peptide (10(-10) mol/L) than in controls (10(-14) mol/L). 5. Protein kinase C activity, which mediates the effects of AngII on Na(+)-ATPase was only one-third of normal values in the MalN group. 6. These results indicate that placental oxidative stress may contribute to fetal undernutrition, which leads to later disturbances in Na(+) pumps from proximal tubule cells.
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Affiliation(s)
- Leucio D Vieira-Filho
- Department of Physiology and Pharmacology, Federal University of Pernambuco, Recife, Brazil
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Chronic undernutrition alters renal active Na+ transport in young rats: potential hidden basis for pathophysiological alterations in adulthood? Eur J Nutr 2009; 48:437-45. [DOI: 10.1007/s00394-009-0032-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2008] [Accepted: 04/27/2009] [Indexed: 01/08/2023]
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Axelband F, Assunção-Miranda I, de Paula IR, Ferrão FM, Dias J, Miranda A, Miranda F, Lara LS, Vieyra A. Ang-(3-4) suppresses inhibition of renal plasma membrane calcium pump by Ang II. ACTA ACUST UNITED AC 2009; 155:81-90. [PMID: 19345245 DOI: 10.1016/j.regpep.2009.03.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2008] [Revised: 03/20/2009] [Accepted: 03/25/2009] [Indexed: 01/27/2023]
Abstract
We previously demonstrated that Ang II inhibits the renal plasma membrane Ca(2+)-ATPase. In the present work we have studied the effect of Ang II, at concentrations similar to those found in the renal interstitium, on the Ca(2+)-ATPase from proximal tubule cells. High Ang II concentration (5 x 10(-7) mol/L) led to the recovery of Ca(2+)-ATPase activity previously inhibited by 50% at low Ang II concentration (10(-10) mol/L). Reactivation occurred in parallel with: (i) formation of only two dead-end metabolites [Ang-(3-4) and Tyr] after incubation of isolated membranes with micromolar Ang II; and (ii) dissociation of constitutive AT(1)R/AT(2)R heterodimers, which are preserved with 10(-10) mol/L Ang II. When the membranes were incubated with 10(-14) mol/L Ang-(3-4), inhibition by 10(-10) mol/L Ang II was no longer observed. The counteracting effect of Ang-(3-4) was abolished by PD123319, an antagonist of AT(2)R, and mimicked by CGP42112A, an agonist of AT(2)R. Ang-(1-7) is an intermediate in the formation of Ang-(3-4) via a pathway involving angiotensin-converting enzyme (ACE), and complete dipeptide breakdown to Tyr and Val is impaired by low Ang II. We conclude that Ang-(3-4) may be a physiological regulator of active Ca(2+) fluxes in renal proximal cells by acting within the renin-angiotensin axis.
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Affiliation(s)
- Flavia Axelband
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
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Adenosine deamination to inosine in isolated basolateral membrane from kidney proximal tubule: implications for modulation of the membrane-associated protein kinase A. Arch Biochem Biophys 2009; 486:44-50. [PMID: 19327339 DOI: 10.1016/j.abb.2009.03.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 03/13/2009] [Accepted: 03/19/2009] [Indexed: 11/20/2022]
Abstract
In this work, the metabolism of adenosine by isolated BLM associated-enzymes and the implications of this process for the cAMP-signaling pathway are investigated. Inosine was identified as the major metabolic product, suggesting the presence of adenosine deaminase (ADA) activity in the BLM. This was confirmed by immunoblotting and ADA-specific enzyme assay. Implications for the enzymatic deamination of adenosine on the receptor-modulated cAMP-signaling pathway were also investigated. We observed that inosine induced a 2-fold increase in [(35)S] GTPgammaS binding to the BLM and it was inhibited by 10(-6)M DPCPX, an A(1) receptor-selective antagonist. Inosine (10(-7)M) inhibited protein kinase A activity in a DPCPX-sensitive manner. Molecular association between ADA and G(alphai-3) protein-coupled A(1) receptor was demonstrated by co-immunoprecipitation assay. These data show that adenosine is deaminated by A(1) receptor-associated ADA to inosine, which in turn modulates PKA in the BLM through A(1) receptor-mediated inhibition of adenylyl cyclase.
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Saraiva VB, Wengert M, Gomes-Quintana E, Heise N, Caruso-Neves C. Na+-ATPase and protein kinase C are targets to 1-O-hexadecylphosphocoline (miltefosine) in Trypanosoma cruzi. Arch Biochem Biophys 2009; 481:65-71. [DOI: 10.1016/j.abb.2008.10.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Revised: 10/15/2008] [Accepted: 10/16/2008] [Indexed: 11/26/2022]
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Lara LS, Correa JS, Lavelle AB, Lopes AG, Caruso-Neves C. The angiotensin receptor type 1-Gq protein-phosphatidyl inositol phospholipase Cbeta-protein kinase C pathway is involved in activation of proximal tubule Na+-ATPase activity by angiotensin(1-7) in pig kidneys. Exp Physiol 2008; 93:639-47. [PMID: 18245203 DOI: 10.1113/expphysiol.2007.040584] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In a previous study, we observed that angiotensin(1-7) (Ang(1-7)) stimulates proximal tubule Na+-ATPase activity through the angiotensin receptor type 1 (AT1R). Here we aimed to study the signalling pathways involved. Our results show that the stimulatory effect of Ang(1-7) on Na+-ATPase activity through AT1R involves a Gq protein-phosphatidyl inositol-phospholipase Cbeta (PI-PLCbeta) pathway because: (1) the effect was reversed by GDPbetaS, a non-hydrolysable GDP analogue, and by a monoclonal Gq protein antibody; (2) the effect was similar and not additive to that of GTPgammaS, a non-hydrolysable GTP analogue; (3) Ang(1-7) induced a rapid decrease (30 s) in phosphatidylinositol 4,5-bisphosphate levels, a PI-PLCbeta substrate; and (4) U73122, a specific inhibitor of PI-PLCbeta, abolished Ang(1-7)-induced stimulation of Na+-ATPase activity. Angiotensin(1-7) increased the protein kinase C (PKC) activity similarly to phorbol-12-myristate-13-acetate (PMA), an activator of PKC. This effect was reversed by losartan, a specific antagonist of AT1R. The stimulatory effects of Ang(1-7) and PMA on Na+-ATPase activity are similar, non-additive and reversed by calphostin C, a specific inhibitor of PKC. A catalytic subunit of PKC (PKC-M) increased the Na+-ATPase activity. These data show that Ang(1-7) stimulates Na+-ATPase activity through the AT1R-Gq protein-PI-PLCbeta-PKC pathway. This effect is similar to that described for angiotensin II, showing for the first time that these compounds could have similar effects in the renal system.
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Affiliation(s)
- Lucienne S Lara
- Departamento de Farmacologia Básica e Clínica, Instituto de Ciências Biomédicas, Brazil
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Cabral LMP, Wengert M, da Ressurreição AAA, Feres-Elias PHP, Almeida FG, Vieyra A, Caruso-Neves C, Einicker-Lamas M. Ceramide is a potent activator of plasma membrane Ca2+-ATPase from kidney-promixal tubule cells with protein kinase A as an intermediate. J Biol Chem 2007; 282:24599-606. [PMID: 17606608 DOI: 10.1074/jbc.m701669200] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The kidney-proximal tubules are involved in reabsorbing two-thirds of the glomerular ultrafiltrate, a key Ca(2+)-modulated process that is essential for maintaining homeostasis in body fluid compartments. The basolateral membranes of these cells have a Ca(2+)-ATPase, which is thought to be responsible for the fine regulation of intracellular Ca(2+) levels. In this paper we show that nanomolar concentrations of ceramide (Cer(50) = 3.5 nm), a natural product derived from sphingomyelinase activity in biological membranes, promotes a 50% increase of Ca(2+)-ATPase activity in purified basolateral membranes. The stimulatory effect of ceramide occurs through specific and direct (cAMP-independent) activation of a protein kinase A (blocked by 10 nm of the specific inhibitor of protein kinase A (PKA), the 5-22 peptide). The activation of PKA by ceramide results in phosphorylation of the Ca(2+)-ATPase, as detected by an anti-Ser/Thr specific PKA substrate antibody. It is observed a straight correlation between increase of Ca(2+)-ATPase activity and PKA-mediated phosphorylation of the Ca(2+) pump molecule. Ceramide also stimulates phosphorylation of renal Ca(2+)-ATPase via protein kinase C, but stimulation of this pathway, which inhibits the Ca(2+) pump in kidney cells, is counteracted by the ceramide-triggered PKA-mediated phosphorylation. The potent effect of ceramide reveals a new physiological activator of the plasma membrane Ca(2+)-ATPase, which integrates the regulatory network of glycerolipids and sphingolipids present in the basolateral membranes of kidney cells.
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Affiliation(s)
- Lindsey M P Cabral
- Laboratório de Físico-Química Biológica Aída Hassón-Voloch, Universidade Federal do Rio de Janeiro, 21949-900, Rio de Janeiro, Brazil
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Assunção-Miranda I, Guilherme AL, Reis-Silva C, Costa-Sarmento G, Oliveira MM, Vieyra A. Protein kinase C-mediated inhibition of renal Ca2+ ATPase by physiological concentrations of angiotensin II is reversed by AT1- and AT2-receptor antagonists. ACTA ACUST UNITED AC 2005; 127:151-7. [PMID: 15680481 DOI: 10.1016/j.regpep.2004.11.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2004] [Revised: 10/28/2004] [Accepted: 11/13/2004] [Indexed: 01/27/2023]
Abstract
Angiotensin II (Ang II) increases the cytosolic Ca2+ concentration in different cell types. In this study, we investigate the effect of Ang II on the Ca2+ ATPase of purified basolateral membranes of kidney proximal tubules. This enzyme pumps Ca2+ out of the cytosol in a reaction coupled to ATP hydrolysis, and it is responsible for the fine-tuned regulation of cytosolic Ca2+ activity. Ca2+-ATPase activity is inhibited by picomolar concentrations of Ang II, with maximal inhibition being attained at approximately 50% of the control values. The presence of raising concentrations (10(-11) to 10(-7) M) of losartan (an AT1-receptor antagonist) or PD123319 (an AT2-receptor antagonist) gradually reverts inhibition by Ang II. Both the phospholipase C (PLC) inhibitor U-73122 (10(-6) M) and the inhibitor of protein kinase C (PKC) staurosporine (10(-7) M) prevent inhibition of the Ca2+ pump by Ang II. Incubation of the previously isolated membranes with a PKC activator-the phorbol ester 12-O-tetradecanoylphorbol-13-acetate (10(-8) M)-mimics the inhibition found with Ang II, and the effects of the compounds are not additive. Taken as a whole, these results indicate the Ang II inhibits Ca2+-ATPase by activation of a PKC system present in primed state in these membranes after binding of the hormone to losartan- and PD123319-sensitive receptors coupled to a PLC. Therefore, inhibition of the basolateral membrane Ca2+-ATPase by kinase-mediated phosphorylation appears to be one of the pathways by which Ang II promotes an increase in the cytosolic Ca2+ concentration of proximal tubule cells.
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Affiliation(s)
- Iranaia Assunção-Miranda
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro 21941-590, Rio de Janeiro, Brazil
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Valverde RHF, Tortelote GG, Lemos T, Mintz E, Vieyra A. Ca2+/calmodulin-dependent protein kinase II is an essential mediator in the coordinated regulation of electrocyte Ca2+-ATPase by calmodulin and protein kinase A. J Biol Chem 2005; 280:30611-8. [PMID: 15987689 DOI: 10.1074/jbc.m501880200] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The aim of this study was to investigate (a) whether Ca2+/calmodulin-dependent protein kinase II (CaM kinase II) participates in the regulation of plasma membrane Ca2+-ATPase and (b) its possible cross-talk with other kinase-mediated modulatory pathways of the pump. Using isolated innervated membranes of the electrocytes from Electrophorus electricus L., we found that stimulation of endogenous protein kinase A (PKA) strongly phosphorylated membrane-bound CaM kinase II with simultaneous substantial activation of the Ca2+ pump (approximately 2-fold). The addition of cAMP (5-50 pM), forskolin (10 nM), or cholera toxin (10 or 100 nM) stimulated both CaM kinase II phosphorylation and Ca2+-ATPase activity, whereas these activation processes were cancelled by an inhibitor of the PKA alpha-catalytic subunit. When CaM kinase II was blocked by its specific inhibitor KN-93, the Ca2+-ATPase activity decreased to the levels measured in the absence of calmodulin; the unusually high Ca2+ affinity dropped 2-fold; and the PKA-mediated stimulation of Ca2+-ATPase was no longer seen. Hydroxylamine-resistant phosphorylation of the Ca2+-ATPase strongly increased when the PKA pathway was activated, and this phosphorylation was suppressed by inhibition of CaM kinase II. We conclude that CaM kinase II is an intermediate in a complex regulatory network of the electrocyte Ca2+ pump, which also involves calmodulin and PKA.
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Affiliation(s)
- Rafael H F Valverde
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-590, Brazil
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36
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Nogaroli L, Silva OF, Bonilha TA, Moreno PAM, Bernardo RR, Vieyra A, Einicker-Lamas M. Diacylglycerol kinase activity in purified basolateral membranes of kidney tubules. I. Evidence for coupling with phospholipase C. Int J Biochem Cell Biol 2005; 37:79-90. [PMID: 15381152 DOI: 10.1016/j.biocel.2004.05.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2003] [Revised: 05/14/2004] [Accepted: 05/17/2004] [Indexed: 10/26/2022]
Abstract
The diacylglycerol kinase (DGK) catalyzes the phosphorylation of diacylglycerol (DAG) yielding phosphatidic acid (PA) signaling molecules which are involved in the modulation of different cell responses. The aim of this work was to characterize the DGK activity associated to the basolateral membranes (BLM) of kidney proximal tubules, in a native preparation that preserves the membrane microenvironment. The Arrhenius plot of DGK activity was non-linear, indicating a complex influence of the lipid environment of the native membrane. The formation of PA was strongly impaired by U73122, an inhibitor of PLC, whereas remained unmodified when exogenous DAG or PLC were added. The Mg.ATP2- complex is the true phosphoryl-donor substrate, and the very narrow peak of activation at pH 7.0 suggests that amino acids that dissociate at this pH, i.e. hystidine residues, play a role by acting in the coordination of the Mg2+ atoms. The renal DGK is almost completely blocked by 0.1 mM sphingosine, but it is insensitive to micromolar free Ca2+ concentrations and to R59499, the most potent inhibitor of the classical DGKs. Taken as a whole, these data suggest that the DGK isoform present in BLM of proximal tubules is different from those included in the type I family, and that membranous PLC could be the main source of DAG for DGK catalysis.
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Affiliation(s)
- Luciana Nogaroli
- Laboratório de Fisico-Química Biológica Aída Hassón-Voloch, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Ilha do Fundão, 21949-900, Rio de Janerio, Brazil
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Smets I, Caplanusi A, Despa S, Molnar Z, Radu M, VandeVen M, Ameloot M, Steels P. Ca2+ uptake in mitochondria occurs via the reverse action of the Na+/Ca2+ exchanger in metabolically inhibited MDCK cells. Am J Physiol Renal Physiol 2003; 286:F784-94. [PMID: 14665432 DOI: 10.1152/ajprenal.00284.2003] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
In ischemic or hypoxic tissues, elevated Ca2+ levels have emerged as one of the main damaging agents among other Ca2+-independent mechanisms of cellular injury. Because mitochondria, besides the endoplasmic reticulum, play a key role in the maintainance of cellular Ca2+ homeostasis, alterations in the mitochondrial Ca2+ content ([Ca2+]m) were monitored in addition to changes in cytosolic Ca2+ concentration ([Ca2+]i) during metabolic inhibition (MI) in renal epithelial Madin-Darby canine kidney (MDCK) cells. [Ca2+]i and [Ca2+]m were monitored via, respectively, fura 2 and rhod 2 measurements. MI induced an increase in [Ca2+]i reaching 631+/-78 nM in approximately 20 min, followed by a decrease to 118+/-9 nM in the next approximately 25 min. A pronounced drop in cellular ATP levels and a rapid increase in intracellular Na+ concentrations in the first 20 min of MI excluded Ca2+ efflux in the second phase via plasma membrane ATPases or Na+/Ca2+ exchangers (NCE). Mitochondrial rhod 2 intensities increased to 434+/-46% of the control value during MI, indicating that mitochondria sequester Ca2+ during MI. The mitochondrial potential (deltapsim) was lost in 20 min of MI, excluding mitochondrial Ca2+ uptake via the deltapsim-dependent mitochondrial Ca2+ uniporter after 20 min of MI. Under Na+-free conditions, or when CGP-37157, a specific inhibitor of the mitochondrial NCE, was used, no drop in [Ca2+]i was seen during MI, whereas the MI-induced increase in mitochondrial rhod 2 fluorescence was strongly reduced. To our knowledge, this study is the first to report that in metabolically inhibited renal epithelial cells mitochondria take up Ca2+ via the NCE acting in the reverse mode.
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Affiliation(s)
- Ilse Smets
- MBW-Dept. of Physiology, Limburgs Universitair Centrum/Transnationale Universiteit Limburg, Biomedisch Onderzoeksinstituut, Universitaire Campus Gebouw D, B-3590 Diepenbeek, Belgium.
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38
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Silva IV, Caruso-Neves C, Azeredo IM, Carvalho TLG, Lara LS, de Mello MC, Lopes AG. Urea inhibition of renal (NA+ + K+)ATPase activity is reversed by cAMP. Arch Biochem Biophys 2002; 406:183-9. [PMID: 12361706 DOI: 10.1016/s0003-9861(02)00405-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
In the present work we studied the modulation of the effect of urea on the renal (Na+ + K+)ATPase by cAMP. We observed that urea inhibits the (NA+ + K+)ATPase activity in a dose-dependent manner, reaching 60% of inhibition at the concentration of 1M. This effect was completely reversed by dibutyryl-cAMP (dBcAMP) at 5 x 10(-4)M. The effect of dBcAMP was mimicked by 50 units of the catalytic subunit of protein kinase A and completely abolished by 5 x 10(-7)M H89, an inhibitor of protein kinase A. Addition of 1M urea decreases basal phosphorylation of the immunoprecipitated (NA+ + K+)ATPase in 50%, with this effect completely reversed by 5 x 10(-4)M dBcAMP. Furthermore, 5 x 10(-4)M dBcAMP by itself induced (NA+ + K+)ATPase phosphorylation. Taken together these data indicate that cAMP could be, in addition to the organic solutes already known, an important physiological modulator of the deleterious effect of urea on enzyme activity.
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Affiliation(s)
- Ian V Silva
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, CCS-Bloco G, Rio de Janeiro, Brazil
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Coka-Guevara S, Markus RP, Caruso-Neves C, Lopes AG, Vieyra A. Adenosine inhibits the renal plasma-membrane (Ca2+ + Mg2+)-ATPase through a pathway sensitive to cholera toxin and sphingosine. EUROPEAN JOURNAL OF BIOCHEMISTRY 1999; 263:71-8. [PMID: 10429189 DOI: 10.1046/j.1432-1327.1999.00456.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Adenosine, a potent autacoid produced and released in kidneys, affects nearly all aspects of renal function, and an increase in cytosolic calcium has been implicated in adenosine effects. The aim of this work was to investigate whether adenosine modifies the calcium pump present in basolateral membranes of kidney proximal tubule cells. Adenosine exerts a biphasic influence on (Ca2+ + Mg2+)-ATPase activity. Inhibition occurs up to 0.1 microM and then gradually disappears as the adenosine concentration increases to 100 microM, an effect mimicked by the adenosine analog N6-cyclohexyladenosine, which preferentially binds to A1-type receptors. In contrast, the A2 receptor agonist 5', N-ethylcarboxamideadenosine is ineffective. The A1 receptor antagonist 8-cyclopentyl-1,3-dimethylxanthine blocks the inhibitory effect of 0.1 microM adenosine and stimulates (Ca2+ + Mg2+)-ATPase activity in the presence of 1 mM adenosine, a concentration high enough to occupy the low-affinity A2 receptors. Inhibition by adenosine increases as medium ATP is lowered to micromolar concentrations, is maintained in the presence of pertussis toxin, and is completely abolished with 0.1 microM cholera toxin or 1 microM sphingosine. The inhibitory effect of adenosine can be reproduced by guanosine 5'-[gamma-thio]triphosphate, inositol 1,4, 5-trisphosphate or the diacylglycerol analog 12-O-tetradecanoylphorbol 13-acetate. In conjunction with the selectivity for its analogs and for its receptor agonist, the concentration profile of adenosine effects indicates that both inhibitory (A1) and stimulatory (A2) receptors are involved. The results obtained with the toxins indicate that a pathway that is modulated by G-proteins, involves a phospholipase C and a protein kinase C, and is affected by local variations in adenosine concentrations participates in the regulation of the (Ca2+ + Mg2+)-ATPase resident in basolateral membranes of kidney proximal tubules.
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Affiliation(s)
- S Coka-Guevara
- Departmento de Bioquímica Médica, Instituto de Ciências Biomédicas,Universidade Federal do Rio de Janeiro, Brazil
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Abstract
Ca2+ transport in kidney has gained considerable attention in the recent past. Our laboratory has been involved in understanding the regulatory mechanisms underlying Ca2+ transport in the kidney across the renal basolateral membrane. We have shown that ANP, a cardiac hormone, mediates its biological functions by acting on its receptors in the kidney basolateral membrane. Furthermore, it has been established that ANP receptors are coupled with Ca2+ ATPase, the enzyme that participates in the vectorial translocation of Ca2+ from the tubular lumen to the plasma. It is possible that a defect in the ANP-receptor-effector system in diabetes (under certain conditions such as hypertension) may be associated with abnormal Ca2+ homeostasis and the development of nephropathy. Accordingly, future studies are needed to establish this hypothesis.
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Affiliation(s)
- P K Ganguly
- Division of Cardiovascular Sciences, St. Boniface General Hospital Research Centre, Faculty of Medicine, University of Manitoba, Winnipeg, Canada
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41
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Cejka JC, Le Maout S, Bidet M, Tauc M, Poujeol P. Activation of calcium influx by ATP and store depletion in primary cultures of renal proximal cells. Pflugers Arch 1994; 427:33-41. [PMID: 7520158 DOI: 10.1007/bf00585939] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Cytoplasmic calcium changes and calcium influx evoked by adenosine triphosphate (ATP) were investigated in primary cultures of rabbit proximal convoluted tubule cells. Extracellular ATP (50 microM) induced a biphasic increase of [Ca2+]i measured with the calcium probe fura-2. In the early phase, the mobilization of intracellular pools resulted in a transient increase of [Ca2+]i from 106 +/- 11 nM (n = 36) to 1059 +/- 115% (n = 29) of the resting level within 10 s. In the presence of external calcium, [Ca2+]i then decreased within 3 min to a sustained level (398 +/- 38%, n = 8). Measurements of fura-2 quenching by external manganese revealed that this phase was the result of an increased Ca2+ uptake, blocked by lanthanum (10 microM) and verapamil (100 microM) but not by the nifedipin (25 microM). Internal calcium store depletion by ATP induced an increased calcium influx through lanthanum- and verapamil-sensitive, nifedipin-insensitive calcium channels, located on the apical membrane of the cells. As indicated by 86Rb+ efflux measurements, ATP activated a potassium efflux that was blocked by barium and Leiurus quinquestriatus hebraeus (LQH) venom (containing charybdotoxin) indicating the involvement of Ca(2+)-sensitive K+ channels. Moreover, in the presence of the LQH venom, the internal calcium stores were not replenished after being depleted by ATP. Our results indicate that an ATP-evoked hyperpolarization of the plasma membrane leads to increased Ca2+ influx, which facilitates the replenishment of the internal stores.
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Affiliation(s)
- J C Cejka
- Département de Biologie Cellulaire et Moléculaire, Centre d'Etudes de Saclay, Gif sur Yvette, France
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42
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Cunha VM, Meyer-Fernandes JR, Noël F. A (Ca(2+)-Mg2+)ATPase from Schistosoma mansoni is coupled to an active transport of calcium. Mol Biochem Parasitol 1992; 52:167-73. [PMID: 1535690 DOI: 10.1016/0166-6851(92)90049-p] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The (Ca(2+)-Mg2+)ATPase activity in microsomes of Schistosoma mansoni is fully inhibited by vanadate (I50 = 2.5 microM). 45Ca2+ is accumulated within microsomal vesicles in an ATP-dependent process that is enhanced 5-fold in the presence of 40 mM phosphate. Accumulated 45Ca2+ is rapidly released by 5 microM of the Ca2+ ionophore A23187 (t1/2 less than or equal to 6 s). (Ca(2+)-Mg2+)ATPase activity and Ca2+ uptake share the same subcellular distribution pattern and similar Ca2+ sensitivities (K0.5 = 0.39 microM and 0.15 microM, respectively). The substrate selectivity is high for both ATPase activity and Ca2+ transport. These results indicate the presence of an active transport of Ca2+ coupled to the (Ca(2+)-Mg2+)ATPase activity previously described in this parasite. A plasma membrane localization and physiological role in calcium homeostasis are suggested.
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Affiliation(s)
- V M Cunha
- Departamento de Parasitologia e Biofísica Celular, Universidade Federal do Rio de Janeiro, Brazil
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43
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Novel effects of calmodulin and calmodulin antagonists on the plasma membrane (Ca2+ + Mg2+)-ATPase from rabbit kidney proximal tubules. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)99217-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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44
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ATP in equilibrium with 32Pi exchange catalyzed by plasma membrane Ca(2+)-ATPase from kidney proximal tubules. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)99229-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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45
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Jacobs WR, Sgambati M, Gomez G, Vilaro P, Higdon M, Bell PD, Mandel LJ. Role of cytosolic Ca in renal tubule damage induced by anoxia. THE AMERICAN JOURNAL OF PHYSIOLOGY 1991; 260:C545-54. [PMID: 2003577 DOI: 10.1152/ajpcell.1991.260.3.c545] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Cytosolic free Ca (Caf) was measured in three different preparations of freshly prepared proximal tubules from the rabbit kidney during energy deprivation using fura-2. Isolated perfused tubules, tubules immobilized on glass cover slips, and tubules in suspension were subjected to inhibitors of oxidative phosphorylation ("chemical hypoxia"); the latter two preparations were also subjected to 40 min of anoxia. During normoxia, Caf ranged from 100 to 180 nM in all three preparations, and chemical hypoxia caused either no change or a small (30-100%) increase in Caf values. Subsequent addition of Ca ionophores increased Caf to 300-500 nM in the first 2 min and to greater than 1 microM after 15 min. In individual experiments, anoxia produced similar responses to those of chemical hypoxia, eliciting no average significant change in Caf, despite clear evidence for impaired respiration and plasma membrane damage after 40 min of anoxia. This lack of change in Caf was unrelated to "Ca buffering" by fura-2 or inactivation of the dye, since Caf increased to 666 +/- 59 nM upon addition of Ca ionophore during anoxia. These data suggest that increased Caf is not a prerequisite for cellular damage during anoxia in proximal renal tubules. Furthermore, no apparent alteration in plasma membrane permeability to Ca occurs before membrane disruption. Decreased ATP seems to initiate a series of Caf-independent events that cause irreversible injury.
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Affiliation(s)
- W R Jacobs
- Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710
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46
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Kelley LK, Borke JL, Verma AK, Kumar R, Penniston JT, Smith CH. The calcium-transporting ATPase and the calcium- or magnesium-dependent nucleotide phosphatase activities of human placental trophoblast basal plasma membrane are separate enzyme activities. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)39382-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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47
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ATP-driven Ca2+ pump in the basolateral membrane of rat kidney cortex catalyzes an electroneutral Ca2+/H+ antiport. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 945:281-90. [PMID: 2973352 DOI: 10.1016/0005-2736(88)90490-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An ATP-driven Ca2+ pump in the basolateral membrane of rat kidney cortex pumps Ca2+ out of the cell at the expense of MgATP (Km = 0.191 mM). This pump has a high affinity for free Ca2+ (26 nM). Vanadate, lanthanum, N-ethylmaleimide and calmodulin inhibitor R24571 inhibited this pump activity. Dimethyl[2-14C]oxazolidine-2,4-dione [( 14C]DMO) was entrapped in the vesicles in association with the ATP-driven Ca2+ influx. The ATP-driven Ca2+ influx was stimulated by the intravesicular acid pH and an upper convex Lineweaver-Burk reciprocal plot suggested two possible kinetics; one is that this Ca2+ pump is an allosteric enzyme with more than 1.72 H+ binding sites and another is the presence of two Ca2+ pumps with different affinities for H+. Valinomycin study indicated that the ATP-dependent Ca2+ transport by the BLMV was electroneutral and voltage independent. These results strongly suggest that the ATP-driven Ca2+ pump in the renal basolateral membrane catalyzes an electroneutral Ca2+/H+ antiport.
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48
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Evers C, Hugentobler G, Lester R, Gmaj P, Meier P, Murer H. ATP-dependent Ca2+ uptake and Ca2+-dependent protein phosphorylation in basolateral liver plasma membranes. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 939:542-50. [PMID: 2965601 DOI: 10.1016/0005-2736(88)90101-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
ATP-dependent Ca2+ uptake was measured in vesicles of rat liver cell basolateral plasma membranes. Nucleotide-dependent uptake was specific for ATP and observed at pH 7.0 and 7.4/7.5 but not at pH 8.0. ATP-dependent Ca2+ transport was only observed in the presence of Mg2+. Kinetic analysis of ATP-dependent transport revealed an apparent Km in the submicromolar region. Addition of calmodulin and trifluoperazine had no effect on ATP-dependent uptake. A Ca2+-dependent, phosphorylated intermediate with the apparent molecular weight of 135,000 could be demonstrated in the basolateral plasma membranes. Phosphorylated intermediates with apparent molecular weights of 200,000 and 110,000 were demonstrated in microsomes and appeared to contaminate 'basolateral' membrane protein phosphorylation. The results suggest that a 135,000 molecular weight protein is a Ca2+-ATPase and the enzymatic expression of the liver cell basolateral membrane Ca2+ pump.
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Affiliation(s)
- C Evers
- Department of Physiology, University of Zurich, Switzerland
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49
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de Meis L, Inesi G. Effects of organic solvents, methylamines, and urea on the affinity for Pi of the Ca2+-ATPase of sarcoplasmic reticulum. J Biol Chem 1988. [DOI: 10.1016/s0021-9258(19)57372-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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50
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van Os CH. Transcellular calcium transport in intestinal and renal epithelial cells. BIOCHIMICA ET BIOPHYSICA ACTA 1987; 906:195-222. [PMID: 2954588 DOI: 10.1016/0304-4157(87)90012-8] [Citation(s) in RCA: 99] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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