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Angel S, Eades LJ, Sim G, Czopek A, Dhaun N, Krystek P, Miller MR. New insights into the association of air pollution and kidney diseases by tracing gold nanoparticles with inductively coupled plasma mass spectrometry. Anal Bioanal Chem 2024; 416:2683-2689. [PMID: 38206347 PMCID: PMC11009748 DOI: 10.1007/s00216-023-05105-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 01/12/2024]
Abstract
Exposure to particles from air pollution has been associated with kidney disease; however, the underlying biological mechanisms are incompletely understood. Inhaled particles can gain access to the circulation and, depending on their size, pass into urine, raising the possibility that particles may also sequester in the kidney and directly alter renal function. This study optimised an inductively coupled plasma mass spectrometry (ICP-MS) method to investigate the size dependency of particle accumulation in the kidneys of mice following pulmonary instillation (0.8 mg in total over 4 weeks) to gold nanoparticles (2, 3-4, 7-8, 14 or 40 nm or saline control). Due to the smallest particle sizes being below the limit of detection in single particle mode, ICP-MS was operated in total quantification mode. Gold was detected in all matrices of interest (blood, urine and kidney) from animals treated with all sizes of gold nanoparticles, at orders of magnitude higher than the methodological limit of detection in biological matrices (0.013 ng/mL). A size-dependent effect was observed, with smaller particles leading to greater levels of accumulation in tissues. This study highlights the value of a robust and reliable method by ICP-MS to detect extremely low levels of gold in biological samples for indirect particle tracing. The finding that nano-sized particles translocate from the lung to the kidney may provide a biological explanation for the associations between air pollution and kidney disease.
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Affiliation(s)
- Souzana Angel
- Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, 49 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Lorna J Eades
- School of Chemistry, The University of Edinburgh, Edinburgh, UK
| | - Gavin Sim
- School of Geoscience, The University of Edinburgh, Edinburgh, UK
| | - Alicja Czopek
- Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, 49 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Neeraj Dhaun
- Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, 49 Little France Crescent, Edinburgh, EH16 4TJ, UK
| | - Petra Krystek
- Department of Chemistry and Biology, University of Siegen, Siegen, Germany
- Deltares, Utrecht, Netherlands
| | - Mark R Miller
- Centre for Cardiovascular Science, Queen's Medical Research Institute, University of Edinburgh, 49 Little France Crescent, Edinburgh, EH16 4TJ, UK.
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2
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McArdle Z, Singh R, Bielefeldt-Ohmann H, Moritz K, Schreuder M, Denton K. Brief Early Life Angiotensin Converting Enzyme Inhibition Offers Reno-Protection in Sheep with a Solitary Functioning Kidney at 8 Months of Age. J Am Soc Nephrol 2022; 33:1341-1356. [PMID: 35351818 PMCID: PMC9257814 DOI: 10.1681/asn.2021111534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/18/2022] [Indexed: 11/03/2022] Open
Abstract
Background: Children born with a solitary functioning kidney (SFK) are predisposed to develop hypertension and kidney injury. Glomerular hyperfiltration and hypertrophy contribute to the pathophysiology of kidney injury. Angiotensin converting enzyme inhibitors (ACEi) can mitigate hyperfiltration and may be therapeutically beneficial in reducing progression of kidney injury in SFK. Methods: SFK was induced in male sheep fetuses at 100 days gestation (term=150 day). Between 4-8 weeks of age, SFK lambs received enalapril (SFK+ACEi; 0.5mg/kg/day, once daily, orally) or vehicle (SFK). At 8 months we examined whether SFK+ACEi reduced elevation in blood pressure (BP) and improved basal kidney function, renal functional reserve (RFR; glomerular filtration rate (GFR) response to combined amino acid and dopamine infusion), GFR response to nitric oxide synthase (NOS) inhibition and basal nitric oxide (NO) bioavailability (basal urinary total nitrate+nitrite (NOx)). Results: SFK+ACEi prevented albuminuria, resulted in lower basal GFR (16%), higher renal blood flow (~22%), and lower filtration fraction ( 35%), but similar BP compared to ~ vehicle-treated SFK sheep. Together with greater recruitment of RFR (~14%) in SFK+ACEi animals than SFK, this indicates reduction in glomerular hyperfiltration-mediated kidney dysfunction. During NOS inhibition, the decrease in GFR ( 14%) was greater among SFK+ACEi than among SFK animals. Increased ( 85%) basal urinary total NOx in SFK+ACEi animals compared to SFK indicates elevated NO bioavailability likely contributing to improvements in kidney function and prevention of albuminuria. Conclusions: Brief and early ACEi in SFK is associated with reduced glomerular hyperfiltration-mediated kidney disease up to 8 months of age in a sheep model.
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Affiliation(s)
- Zoe McArdle
- Z McArdle, Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Australia
| | - Reetu Singh
- R Singh, Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Australia
| | - Helle Bielefeldt-Ohmann
- H Bielefeldt-Ohmann, School of Veterinary Science, The University of Queensland, Gatton, Australia
| | - Karen Moritz
- K Moritz, Child Health Research Centre and School of Biomedical Sciences, The University of Queensland, Saint Lucia, Australia
| | - Michiel Schreuder
- M Schreuder, Department of Pediatric Nephrology , Amalia Children's Hospital, Nijmegen, Netherlands
| | - Kate Denton
- K Denton, Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Clayton, Australia
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3
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Singh RR, McArdle ZM, Booth LC, May CN, Head GA, Moritz KM, Schlaich MP, Denton KM. Increase in Bioavailability of Nitric Oxide After Renal Denervation Improves Kidney Function in Sheep With Hypertensive Kidney Disease. Hypertension 2021; 77:1299-1310. [PMID: 33641371 DOI: 10.1161/hypertensionaha.120.16718] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
[Figure: see text].
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Affiliation(s)
- Reetu R Singh
- From the Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Melbourne, Australia (R.R.S., Z.M.M., K.M.D.)
| | - Zoe M McArdle
- From the Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Melbourne, Australia (R.R.S., Z.M.M., K.M.D.)
| | - Lindsea C Booth
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia (L.C.B., C.N.M.)
| | - Clive N May
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Australia (L.C.B., C.N.M.)
| | - Geoff A Head
- Baker Heart and Diabetes Institute, Melbourne, Australia (G.A.H., M.P.S.)
| | - Karen M Moritz
- School of Biomedical Sciences, The University of Queensland, Brisbane, Australia (K.M.M.)
| | - Markus P Schlaich
- Baker Heart and Diabetes Institute, Melbourne, Australia (G.A.H., M.P.S.).,and Dobney Hypertension Centre, School of Medicine, Royal Perth Hospital Unit, University of Western Australia, Australia (M.P.S.)
| | - Kate M Denton
- From the Cardiovascular Program, Monash Biomedicine Discovery Institute and Department of Physiology, Monash University, Melbourne, Australia (R.R.S., Z.M.M., K.M.D.)
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Abstract
PURPOSE OF REVIEW Diabetic nephropathy, a major microvascular complication of diabetes and the most common cause of end-stage renal disease, is characterized by prominent accumulation of extracellular matrix. The membrane microdomains caveolae, and their integral protein caveolin-1, play critical roles in the regulation of signal transduction. In this review we discuss current knowledge of the contribution of caveolin-1/caveolae to profibrotic signaling and the pathogenesis of diabetic kidney disease, and assess its potential as a therapeutic target. RECENT FINDINGS Caveolin (cav)-1 is key to facilitating profibrotic signal transduction induced by several stimuli known to be pathogenic in diabetic nephropathy, including the most prominent factors hyperglycemia and angiotensin II. Phosphorylation of cav-1 on Y14 is an important regulator of these responses. In vivo studies support a pathogenic role for caveolae in the progression of diabetic nephropathy. Targeting caveolin-1/caveolae would enable inhibition of multiple profibrotic pathways, representing a novel and potentially potent therapeutic option for diabetic nephropathy.
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Affiliation(s)
- Richard Van Krieken
- Department of Medicine, Division of Nephrology, St. Joseph's Hospital, McMaster University, 50 Charlton Ave E, T3311, Hamilton, ON, L8N 4A6, Canada
| | - Joan C Krepinsky
- Department of Medicine, Division of Nephrology, St. Joseph's Hospital, McMaster University, 50 Charlton Ave E, T3311, Hamilton, ON, L8N 4A6, Canada.
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Dolinina J, Sverrisson K, Rippe A, Öberg CM, Rippe B. Nitric oxide synthase inhibition causes acute increases in glomerular permeability in vivo, dependent upon reactive oxygen species. Am J Physiol Renal Physiol 2016; 311:F984-F990. [PMID: 27681559 DOI: 10.1152/ajprenal.00152.2016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 09/21/2016] [Indexed: 11/22/2022] Open
Abstract
There is increasing evidence that the permeability of the glomerular filtration barrier (GFB) is partly regulated by a balance between the bioavailability of nitric oxide (NO) and that of reactive oxygen species (ROS). It has been postulated that normal or moderately elevated NO levels protect the GFB from permeability increases, whereas ROS, through reducing the bioavailability of NO, have the opposite effect. We tested the tentative antagonism between NO and ROS on glomerular permeability in anaesthetized Wistar rats, in which the left ureter was cannulated for urine collection while simultaneously blood access was achieved. Rats were systemically infused with either l-NAME or l-NAME together with the superoxide scavenger Tempol, or together with l-arginine or the NO-donor DEA-NONOate, or the cGMP agonist 8-bromo-cGMP. To measure glomerular sieving coefficients (theta, θ) to Ficoll, rats were infused with FITC-Ficoll 70/400 (mol/radius 10-80 Å). Plasma and urine samples were analyzed by high-performance size-exclusion chromatography (HPSEC) for determination of θ for Ficoll repeatedly during up to 2 h. l-NAME increased θ for Ficoll70Å from 2.27 ± 1.30 × 10-5 to 8.46 ± 2.06 × 10-5 (n = 6, P < 0.001) in 15 min. Tempol abrogated these increases in glomerular permeability and an inhibition was also observed with l-arginine and with 8-bromo-cGMP. In conclusion, acute NO synthase inhibition in vivo by l-NAME caused rapid increases in glomerular permeability, which could be reversed by either an ROS antagonist or by activating the guanylyl cyclase-cGMP pathway. The data strongly suggest a protective effect of NO in maintaining normal glomerular permeability in vivo.
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Affiliation(s)
| | | | - Anna Rippe
- Department of Nephrology, Lund University, Lund, Sweden
| | - Carl M Öberg
- Department of Nephrology, Lund University, Lund, Sweden
| | - Bengt Rippe
- Department of Nephrology, Lund University, Lund, Sweden
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6
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Chen YH, Lin WW, Liu CS, Hsu LS, Lin YM, Su SL. Caveolin-1 Expression Ameliorates Nephrotic Damage in a Rabbit Model of Cholesterol-Induced Hypercholesterolemia. PLoS One 2016; 11:e0154210. [PMID: 27124120 PMCID: PMC4849769 DOI: 10.1371/journal.pone.0154210] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 04/10/2016] [Indexed: 01/14/2023] Open
Abstract
Caveolin-1 (CAV-1) participates in regulating vesicular transport, signal transduction, tumor progression, and cholesterol homeostasis. In the present study, we tested the hypothesis that CAV-1 improves dyslipidemia, inhibits cyclophilin A (CypA)- mediated ROS production, prevents mitochondrial compensatory action and attenuates oxidative stress responses in cholesterol-induced hypercholesterolemia. To determine the role of CAV-1 in mediating oxidative and antioxidative as well as cholesterol homeostasis, hypercholesterolemic rabbits were intravenously administered antenapedia-CAV-1 (AP-CAV-1) peptide for 2 wk. AP-CAV-1 enhanced CAV-1 expression by ˃15%, inhibited CypA expression by ˃50% (P < 0.05) and significantly improved dyslipidemia, thus reducing neutral lipid peroxidation. Moreover, CAV-1 attenuated hypercholesterolemia-induced changes in mitochondrial morphology and biogenesis and preserved mitochondrial respiratory function. In addition, CAV-1 protected against hypercholesterol-induced oxidative stress responses by reducing the degree of oxidative damage and enhancing the expression of antioxidant enzymes. CAV-1 treatment significantly suppressed apoptotic cell death, as evidenced by the reduction in the number of terminal deoxynucleotidyl transferase dUTP nick end-labeling-positive cells. We concluded that CAV-1 plays a critical role in inhibiting CypA-mediated ROS production, improving dyslipidemia, maintaining mitochondrial function, and suppressing oxidative stress responses that are vital for cell survival in hypercholesterol-affected renal organs.
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Affiliation(s)
- Ya-Hui Chen
- Vascular and Genomic Center, Changhua Christian Hospital, Changhua, Taiwan
- Institute of Biochemistry and Biotechnology, Chung Shan Medical University, Taichung, Taiwan
| | - Wei-Wen Lin
- Department of Internal Medicine, Division of Cardiovascular Center, Taichung Veterans General Hospital, Taichung, Taiwan
| | - Chin-San Liu
- Vascular and Genomic Center, Changhua Christian Hospital, Changhua, Taiwan
- Graduate Institute of Integrative Medicine, China Medical University, Taichung, Taiwan
| | - Li-Sung Hsu
- Institute of Biochemistry and Biotechnology, Chung Shan Medical University, Taichung, Taiwan
| | - Yueh-Min Lin
- Department of Pathology, Changhua Christian Hospital, Changhua, Taiwan
- Department of Medical Technology, Jen-Teh Junior College of Medicine, Nursing and Management, Miaoli, Taiwan
| | - Shih-Li Su
- Vascular and Genomic Center, Changhua Christian Hospital, Changhua, Taiwan
- Department of Internal Medicine, Division of Endocrinology and Metabolism, Changhua Christian Hospital, Changhua, Taiwan
- Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
- * E-mail:
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Strippoli R, Loureiro J, Moreno V, Benedicto I, Pérez Lozano ML, Barreiro O, Pellinen T, Minguet S, Foronda M, Osteso MT, Calvo E, Vázquez J, López Cabrera M, del Pozo MA. Caveolin-1 deficiency induces a MEK-ERK1/2-Snail-1-dependent epithelial-mesenchymal transition and fibrosis during peritoneal dialysis. EMBO Mol Med 2015; 7:102-23. [PMID: 25550395 PMCID: PMC4309670 DOI: 10.15252/emmm.201404127] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Peritoneal dialysis (PD) is a form of renal replacement therapy whose repeated use can alter dialytic function through induction of epithelial–mesenchymal transition (EMT) and fibrosis, eventually leading to PD discontinuation. The peritoneum from Cav1−/− mice showed increased EMT, thickness, and fibrosis. Exposure of Cav1−/− mice to PD fluids further increased peritoneal membrane thickness, altered permeability, and increased the number of FSP-1/cytokeratin-positive cells invading the sub-mesothelial stroma. High-throughput quantitative proteomics revealed increased abundance of collagens, FN, and laminin, as well as proteins related to TGF-β activity in matrices derived from Cav1−/− cells. Lack of Cav1 was associated with hyperactivation of a MEK-ERK1/2-Snail-1 pathway that regulated the Smad2-3/Smad1-5-8 balance. Pharmacological blockade of MEK rescued E-cadherin and ZO-1 inter-cellular junction localization, reduced fibrosis, and restored peritoneal function in Cav1−/− mice. Moreover, treatment of human PD-patient-derived MCs with drugs increasing Cav1 levels, as well as ectopic Cav1 expression, induced re-acquisition of epithelial features. This study demonstrates a pivotal role of Cav1 in the balance of epithelial versus mesenchymal state and suggests targets for the prevention of fibrosis during PD.
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Affiliation(s)
- Raffaele Strippoli
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain Department of Cellular Biotechnologies and Haematology, Sapienza University of Rome, Rome, Italy
| | - Jesús Loureiro
- Molecular Biology Unit, Hospital Universitario de la Princesa Instituto de Investigación Sanitaria Princesa (IP), Madrid, Spain
| | - Vanessa Moreno
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Ignacio Benedicto
- Molecular Biology Unit, Hospital Universitario de la Princesa Instituto de Investigación Sanitaria Princesa (IP), Madrid, Spain
| | - María Luisa Pérez Lozano
- Molecular Biology Unit, Hospital Universitario de la Princesa Instituto de Investigación Sanitaria Princesa (IP), Madrid, Spain
| | - Olga Barreiro
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Teijo Pellinen
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Susana Minguet
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Miguel Foronda
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Maria Teresa Osteso
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Enrique Calvo
- CIBERehd, Instituto de Salud Carlos III, Madrid, Spain
| | - Jesús Vázquez
- CIBERehd, Instituto de Salud Carlos III, Madrid, Spain
| | - Manuel López Cabrera
- Molecular Biology Unit, Hospital Universitario de la Princesa Instituto de Investigación Sanitaria Princesa (IP), Madrid, Spain
| | - Miguel Angel del Pozo
- Department of Vascular biology and Inflammation, Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
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8
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Moriyama T, Takei T, Itabashi M, Uchida K, Tsuchiya K, Nitta K. Caveolae May Enable Albumin to Enter Human Renal Glomerular Endothelial Cells. J Cell Biochem 2015; 116:1060-9. [DOI: 10.1002/jcb.25061] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Accepted: 12/18/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Takahito Moriyama
- Department of Medicine, Kidney CenterTokyo Women's Medical UniversityTokyoJapan
| | - Takashi Takei
- Department of Medicine, Kidney CenterTokyo Women's Medical UniversityTokyoJapan
| | - Mitsuyo Itabashi
- Department of Medicine, Kidney CenterTokyo Women's Medical UniversityTokyoJapan
| | - Keiko Uchida
- Department of Medicine, Kidney CenterTokyo Women's Medical UniversityTokyoJapan
| | - Ken Tsuchiya
- Department of Medicine, Kidney CenterTokyo Women's Medical UniversityTokyoJapan
| | - Kosaku Nitta
- Department of Medicine, Kidney CenterTokyo Women's Medical UniversityTokyoJapan
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9
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Wang L, Zhang C, Su X, Lin DH, Wang W. Caveolin-1 Deficiency Inhibits the Basolateral K+ Channels in the Distal Convoluted Tubule and Impairs Renal K+ and Mg2+ Transport. J Am Soc Nephrol 2015; 26:2678-90. [PMID: 25848073 DOI: 10.1681/asn.2014070658] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 12/22/2014] [Indexed: 01/28/2023] Open
Abstract
Kcnj10 encodes the inwardly rectifying K(+) channel Kir4.1 in the basolateral membrane of the distal convoluted tubule (DCT) and is activated by c-Src. However, the regulation and function of this K(+) channel are incompletely characterized. Here, patch-clamp experiments in Kcnj10-transfected HEK293 cells demonstrated that c-Src-induced stimulation of Kcnj10 requires coexpression of caveolin-1 (cav-1), and immunostaining showed expression of cav-1 in the basolateral membrane of parvalbumin-positive DCT. Patch-clamp experiments detected a 40-pS inwardly rectifying K(+) channel, a heterotetramer of Kir4.1/Kir5.1, in the basolateral membrane of the early DCT (DCT1) in both wild-type (WT) and cav-1-knockout (KO) mice. However, the activity of this basolateral 40-pS K(+) channel was lower in KO mice than in WT mice. Moreover, the K(+) reversal potential (an indication of membrane potential) was less negative in the DCT1 of KO mice than in the DCT1 of WT mice. Western blot analysis demonstrated that cav-1 deficiency decreased the expression of the Na(+)/Cl(-) cotransporter and Ste20-proline-alanine-rich kinase (SPAK) but increased the expression of epithelial Na(+) channel-α. Furthermore, the urinary excretion of Mg(2+) and K(+) was significantly higher in KO mice than in WT mice, and KO mice developed hypomagnesemia, hypocalcemia, and hypokalemia. We conclude that disruption of cav-1 decreases basolateral K(+) channel activity and depolarizes the cell membrane potential in the DCT1 at least in part by suppressing the stimulatory effect of c-Src on Kcnj10. Furthermore, the decrease in Kcnj10 and Na(+)/Cl(-) cotransporter expression induced by cav-1 deficiency may underlie the compromised renal transport of Mg(2+), Ca(2+), and K(+).
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Affiliation(s)
- Lijun Wang
- Department of Physiology, Harbin Medical University, Harbin, China; Department of Pharmacology, New York Medical College, Valhalla, New York; and
| | - Chengbiao Zhang
- Department of Pharmacology, New York Medical College, Valhalla, New York; and Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical College, Xuzhou, China
| | - Xiaotong Su
- Department of Pharmacology, New York Medical College, Valhalla, New York; and
| | - Dao-Hong Lin
- Department of Pharmacology, New York Medical College, Valhalla, New York; and
| | - Wenhui Wang
- Department of Pharmacology, New York Medical College, Valhalla, New York; and
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10
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Guan TH, Chen G, Gao B, Janssen MR, Uttarwar L, Ingram AJ, Krepinsky JC. Caveolin-1 deficiency protects against mesangial matrix expansion in a mouse model of type 1 diabetic nephropathy. Diabetologia 2013; 56:2068-77. [PMID: 23793581 DOI: 10.1007/s00125-013-2968-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Accepted: 05/24/2013] [Indexed: 01/10/2023]
Abstract
AIMS/HYPOTHESIS Glomerular matrix protein accumulation, mediated largely by resident mesangial cells (MCs), is central to the pathogenesis of diabetic nephropathy. We previously showed that caveolin (CAV)-1/caveolae mediate matrix upregulation by MCs in response to high glucose and TGFβ, two important pathogenic mediators of diabetic glomerular sclerosis. Here, we evaluated the in vivo role of CAV-1/caveolae in the development of diabetic nephropathy. METHODS Diabetes was induced in Cav1-knockout (KO) mice and their wild-type (WT) counterparts by streptozotocin injection. After 10 months, kidneys were evaluated for the development of nephropathy, including glomerular sclerosis and upregulation of matrix proteins. Parallel experiments assessing glucose-induced matrix upregulation were carried out in MCs isolated from KO mice. RESULTS KO diabetic mice developed hyperglycaemia and renal hypertrophy, but were protected from developing albuminuria and glomerular sclerosis compared with WT mice. KO mice were significantly protected from the upregulation of glomerular collagen I, fibronectin, connective tissue growth factor (CTGF) and TGFβ. In vitro, glucose induced collagen I A1 promoter activation and collagen I, fibronectin and CTGF protein upregulation in WT but not KO MCs. Re-expression of Cav1 in KO cells restored this response. CONCLUSIONS/INTERPRETATION Cav1 deletion rendered significant protection from glomerular matrix accumulation and albuminuria in a mouse model of type 1 diabetes. These studies provide a foundation for the development of renal-targeted interference with CAV-1/caveolae as a novel approach to the treatment of diabetic nephropathy.
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Affiliation(s)
- T H Guan
- Division of Nephrology, McMaster University, St Joseph's Hospital, 50 Charlton Ave East, Rm T3311, Hamilton, ON, Canada L8N 4A6
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11
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Kvietys PR, Granger DN. Role of reactive oxygen and nitrogen species in the vascular responses to inflammation. Free Radic Biol Med 2012; 52:556-592. [PMID: 22154653 PMCID: PMC3348846 DOI: 10.1016/j.freeradbiomed.2011.11.002] [Citation(s) in RCA: 213] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 11/04/2011] [Accepted: 11/04/2011] [Indexed: 12/23/2022]
Abstract
Inflammation is a complex and potentially life-threatening condition that involves the participation of a variety of chemical mediators, signaling pathways, and cell types. The microcirculation, which is critical for the initiation and perpetuation of an inflammatory response, exhibits several characteristic functional and structural changes in response to inflammation. These include vasomotor dysfunction (impaired vessel dilation and constriction), the adhesion and transendothelial migration of leukocytes, endothelial barrier dysfunction (increased vascular permeability), blood vessel proliferation (angiogenesis), and enhanced thrombus formation. These diverse responses of the microvasculature largely reflect the endothelial cell dysfunction that accompanies inflammation and the central role of these cells in modulating processes as varied as blood flow regulation, angiogenesis, and thrombogenesis. The importance of endothelial cells in inflammation-induced vascular dysfunction is also predicated on the ability of these cells to produce and respond to reactive oxygen and nitrogen species. Inflammation seems to upset the balance between nitric oxide and superoxide within (and surrounding) endothelial cells, which is necessary for normal vessel function. This review is focused on defining the molecular targets in the vessel wall that interact with reactive oxygen species and nitric oxide to produce the characteristic functional and structural changes that occur in response to inflammation. This analysis of the literature is consistent with the view that reactive oxygen and nitrogen species contribute significantly to the diverse vascular responses in inflammation and supports efforts that are directed at targeting these highly reactive species to maintain normal vascular health in pathological conditions that are associated with acute or chronic inflammation.
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Affiliation(s)
- Peter R Kvietys
- College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - D Neil Granger
- Department of Molecular & Cellular Physiology, Louisiana State University Health Sciences Center, Shreveport, LA 71130-3932, USA.
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12
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Zhang Y, Peng F, Gao B, Ingram AJ, Krepinsky JC. High glucose-induced RhoA activation requires caveolae and PKCβ1-mediated ROS generation. Am J Physiol Renal Physiol 2011; 302:F159-72. [PMID: 21975875 DOI: 10.1152/ajprenal.00749.2010] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Glomerular matrix accumulation is a hallmark of diabetic nephropathy. We previously showed that RhoA activation by high glucose in mesangial cells (MC) leads to matrix upregulation (Peng F, Wu D, Gao B, Ingram AJ, Zhang B, Chorneyko K, McKenzie R, Krepinsky JC. Diabetes 57: 1683-1692, 2008). Here, we study the mechanism whereby RhoA is activated. In primary rat MC, RhoA activation required glucose entry and metabolism. Broad PKC inhibitors (PMA, bisindolylmaleimide, Gö6976), as well as specific PKCβ blockade with an inhibitor and small interfering RNA (siRNA), prevented RhoA activation by glucose. PKCβ inhibition also abrogated reactive oxygen species (ROS) generation by glucose. The ROS scavenger N-acetylcysteine (NAC) or NADPH oxidase inhibitors apocynin and DPI prevented glucose-induced RhoA activation. RhoA and some PKC isoforms localize to caveolae. Chemical disruption of these microdomains prevented RhoA and PKCβ1 activation by glucose. In caveolin-1 knockout cells, glucose did not induce RhoA and PKCβ1 activation; these responses were rescued by caveolin-1 reexpression. Furthermore, glucose-induced ROS generation was significantly attenuated by chemical disruption of caveolae and in knockout cells. Downstream of RhoA signaling, activator protein-1 (AP-1) activation was also inhibited by disrupting caveolae, was absent in caveolin-1 knockout MC and rescued by caveolin-1 reexpression. Finally, transforming growth factor (TGF)-β1 upregulation, mediated by AP-1, was prevented by RhoA signaling inhibition and by disruption or absence of caveolae. In conclusion, RhoA activation by glucose is dependent on PKCβ1-induced ROS generation, most likely through NADPH oxidase. The activation of PKCβ1 and its downstream effects, including upregulation of TGF-β1, requires caveolae. These microdomains are thus important mediators of the profibrogenic process associated with diabetic nephropathy.
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Affiliation(s)
- Y Zhang
- Division of Nephrology, McMaster University, Hamilton, Ontario, Canada
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