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McKinzie SR, Kaverina N, Schweickart RA, Chaney CP, Eng DG, Pereira BMV, Kestenbaum B, Pippin JW, Wessely O, Shankland SJ. Podocytes from hypertensive and obese mice acquire an inflammatory, senescent, and aged phenotype. Am J Physiol Renal Physiol 2024; 326:F644-F660. [PMID: 38420674 PMCID: PMC11208020 DOI: 10.1152/ajprenal.00417.2023] [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: 12/22/2023] [Revised: 02/20/2024] [Accepted: 02/20/2024] [Indexed: 03/02/2024] Open
Abstract
Patients with hypertension or obesity can develop glomerular dysfunction characterized by injury and depletion of podocytes. To better understand the molecular processes involved, young mice were treated with either deoxycorticosterone acetate (DOCA) or fed a high-fat diet (HFD) to induce hypertension or obesity, respectively. The transcriptional changes associated with these phenotypes were measured by unbiased bulk mRNA sequencing of isolated podocytes from experimental models and their respective controls. Key findings were validated by immunostaining. In addition to a decrease in canonical proteins and reduced podocyte number, podocytes from both hypertensive and obese mice exhibited a sterile inflammatory phenotype characterized by increases in NLR family pyrin domain containing 3 (NLRP3) inflammasome, protein cell death-1, and Toll-like receptor pathways. Finally, although the mice were young, podocytes in both models exhibited increased expression of senescence and aging genes, including genes consistent with a senescence-associated secretory phenotype. However, there were differences between the hypertension- and obesity-associated senescence phenotypes. Both show stress-induced podocyte senescence characterized by increased p21 and p53. Moreover, in hypertensive mice, this is superimposed upon age-associated podocyte senescence characterized by increased p16 and p19. These results suggest that senescence, aging, and inflammation are critical aspects of the podocyte phenotype in experimental hypertension and obesity in mice.NEW & NOTEWORTHY Hypertension and obesity can lead to glomerular dysfunction in patients, causing podocyte injury and depletion. Here, young mice given deoxycorticosterone acetate or a high-fat diet to induce hypertension or obesity, respectively. mRNA sequencing of isolated podocytes showed transcriptional changes consistent with senescence, a senescent-associated secretory phenotype, and aging, which was confirmed by immunostaining. Ongoing studies are determining the mechanistic roles of the accelerated aging podocyte phenotype in experimental hypertension and obesity.
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Affiliation(s)
- Sierra R McKinzie
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | - Natalya Kaverina
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | | | - Christopher P Chaney
- Department of Medicine, University of Texas Southwestern, Dallas, Texas, United States
| | - Diana G Eng
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | | | - Bryan Kestenbaum
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | - Jeffrey W Pippin
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
| | - Oliver Wessely
- Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio, United States
| | - Stuart J Shankland
- Division of Nephrology, Department of Medicine, University of Washington, Seattle, Washington, United States
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2
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Sanad AM, Qadri F, Popova E, Rodrigues AF, Heinbokel T, Quach S, Schulz A, Bachmann S, Kreutz R, Alenina N, Bader M. Transgenic angiotensin-converting enzyme 2 overexpression in the rat vasculature protects kidneys from ageing-induced injury. Kidney Int 2023:S0085-2538(23)00313-7. [PMID: 37105519 DOI: 10.1016/j.kint.2023.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 03/21/2023] [Accepted: 04/10/2023] [Indexed: 04/29/2023]
Abstract
Chronic kidney disease is one of the leading causes of morbidity and mortality especially among the aged population. A decline in kidney function with ageing comparable to ageing-related processes in human kidneys has also been described in Sprague-Dawley (SD) rats. The renin-angiotensin-system (RAS) plays a pivotal role in the pathophysiology of cardiovascular and kidney disease and is a successful therapeutic target. The discovery of angiotensin-(1-7) (Ang(1-7)), mainly produced by angiotensin-converting enzyme 2 (ACE2), and its receptor MAS offered a new view on the RAS. This ACE2/Ang(1-7)/MAS axis counteracts most deleterious actions of the RAS in the kidney. In order to evaluate if activation of this axis has a protective effect in ageing-induced kidney disease we generated a transgenic rat model (TGR(SM22hACE2)) overexpressing human ACE2 in vascular smooth muscle cells. These animals showed a specific transgene expression pattern and increased ACE2 activity in the kidney. Telemetric recording of the cardiovascular parameters and evaluation of kidney function by histology and urine analysis revealed no alterations in blood pressure regulation and basal kidney function in young transgenic rats when compared to young SD rats. However, with ageing, SD rats developed a decline in kidney function characterized by severe albuminuria which was significantly less pronounced in TGR(SM22hACE2) rats. Concomitantly, we detected lower mRNA expression levels of kidney damage markers in aged transgenic animals. Thus, our results indicate that vascular ACE2-overexpression protects the kidney against ageing-induced decline in kidney function supporting the kidney-protective role of the ACE2/Ang(1-7)/MAS axis.
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Affiliation(s)
- Antonia Maria Sanad
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany; Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Fatimunnisa Qadri
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - Elena Popova
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany
| | - André Felipe Rodrigues
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany; Free University of Berlin, Department of Biology, Chemistry and Pharmacy, Berlin, Germany
| | - Timm Heinbokel
- Charité Universitätsmedizin Berlin, Institute of Pathology, Berlin, Germany; Berlin Institute of Health at Charité Universitatsmedizin Berlin, Berlin, Germany
| | - Susanna Quach
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany; Charité Universitätsmedizin Berlin, Department of Pediatrics, Division of Gastroenterology, Nephrology and Metabolic Medicine, Berlin, Germany; Berlin-Brandenburg School for Regenerative Therapies (BSRT)
| | - Angela Schulz
- Charité Universitätsmedizin Berlin, Institute of Clinical Pharmacology and Toxicology, Berlin, Germany
| | - Sebastian Bachmann
- Charité Universitätsmedizin Berlin, Institute of Functional Anatomy, Berlin, Germany
| | - Reinhold Kreutz
- Charité Universitätsmedizin Berlin, Institute of Clinical Pharmacology and Toxicology, Berlin, Germany
| | - Natalia Alenina
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany
| | - Michael Bader
- Max-Delbrück-Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany; Charité Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany; University of Lübeck, Institute for Biology, Lübeck, Germany.
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3
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Broeker KAE, Schrankl J, Fuchs MAA, Kurtz A. Flexible and multifaceted: the plasticity of renin-expressing cells. Pflugers Arch 2022; 474:799-812. [PMID: 35511367 PMCID: PMC9338909 DOI: 10.1007/s00424-022-02694-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 04/21/2022] [Accepted: 04/22/2022] [Indexed: 12/14/2022]
Abstract
The protease renin, the key enzyme of the renin–angiotensin–aldosterone system, is mainly produced and secreted by juxtaglomerular cells in the kidney, which are located in the walls of the afferent arterioles at their entrance into the glomeruli. When the body’s demand for renin rises, the renin production capacity of the kidneys commonly increases by induction of renin expression in vascular smooth muscle cells and in extraglomerular mesangial cells. These cells undergo a reversible metaplastic cellular transformation in order to produce renin. Juxtaglomerular cells of the renin lineage have also been described to migrate into the glomerulus and differentiate into podocytes, epithelial cells or mesangial cells to restore damaged cells in states of glomerular disease. More recently, it could be shown that renin cells can also undergo an endocrine and metaplastic switch to erythropoietin-producing cells. This review aims to describe the high degree of plasticity of renin-producing cells of the kidneys and to analyze the underlying mechanisms.
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Affiliation(s)
- Katharina A E Broeker
- Institute of Physiology, University of Regensburg, Universitätsstraβe 31, D-93053 , Regensburg, Germany.
| | - Julia Schrankl
- Institute of Physiology, University of Regensburg, Universitätsstraβe 31, D-93053 , Regensburg, Germany
| | - Michaela A A Fuchs
- Institute of Physiology, University of Regensburg, Universitätsstraβe 31, D-93053 , Regensburg, Germany
| | - Armin Kurtz
- Institute of Physiology, University of Regensburg, Universitätsstraβe 31, D-93053 , Regensburg, Germany
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4
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Metformin ameliorates the severity of experimental Alport syndrome. Sci Rep 2021; 11:7053. [PMID: 33782421 PMCID: PMC8007696 DOI: 10.1038/s41598-021-86109-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 03/05/2021] [Indexed: 12/24/2022] Open
Abstract
Metformin is widely used for the treatment of type 2 diabetes, and increasing numbers of studies have shown that metformin also ameliorates tumor progression, inflammatory disease, and fibrosis. However, the ability of metformin to improve non-diabetic glomerular disease and chronic kidney disease (CKD) has not been explored. To investigate the effect of metformin on non-diabetic glomerular disease, we used a mouse model of Alport syndrome (Col4a5 G5X) which were treated with metformin or losartan, used as a control treatment. We also investigated the effect of metformin on adriamycin-induced glomerulosclerosis model. Pathological and biochemical analysis showed that metformin or losartan suppressed proteinuria, renal inflammation, fibrosis, and glomerular injury and extended the lifespan in Alport syndrome mice. Transcriptome analysis showed that metformin and losartan influenced molecular pathways-related to metabolism and inflammation. Metformin altered multiple genes including metabolic genes not affected by losartan. Metformin also suppressed proteinuria and glomerular injury in the adriamycin-induced glomerulosclerosis mouse model. Our results showed that metformin ameliorates the glomerular sclerosis and CKD phenotype in non-diabetic chronic glomerular diseases. Metformin may have therapeutic potential for not only diabetic nephropathy but also non-diabetic glomerular disease including Alport syndrome.
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5
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Yu W, Yang W, Zhao MY, Meng XL. Functional Metabolomics Analysis Elucidating the Metabolic Biomarker and Key Pathway Change Associated With the Chronic Glomerulonephritis and Revealing Action Mechanism of Rhein. Front Pharmacol 2020; 11:554783. [PMID: 33101021 PMCID: PMC7544993 DOI: 10.3389/fphar.2020.554783] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 09/04/2020] [Indexed: 12/14/2022] Open
Abstract
Chronic glomerulonephritis (CGN) as the culprit of kidney failure can increase the mortality of critically ill patients and seriously threatens people’s health all over the world. This study using metabolomics strategy is to reveal the potential therapeutic mechanism-related targets to evaluate the effects of rhein (RH) on CGN rats. Changes of serum metabolites and pathways were analyzed by non-targeted metabolomic method based on liquid chromatography-mass spectrometry (LC-MS) combined with ingenuity pathway analysis. In addition, the levels of biochemical indicators were also detected. A total of 25 potential biomarkers were identified to express serum metabolic turbulence in CGN animal model, and then 16 biomarkers were regulated by RH trending to the normal states. From metabolite enrichment and pathway analysis, pharmacological activity of RH on CGN were mainly involved in six vital metabolic pathways including phenylalanine, tyrosine and tryptophan biosynthesis, phenylalanine metabolism, arachidonic acid metabolism, tricarboxylic acid cycle (TCA cycle), alanine, aspartate, and glutamate metabolism, arginine and proline metabolism. It suggested CGN treatment with RH, which may be mediated via interference with metabolic pathway such as amino acid metabolism, arachidonic acid metabolism, and TCA cycle to regulating inflammation, oxidation response and immune regulation against CGN. It showed that metabolomics method offer deeply insight into the therapeutic mechanisms of natural product.
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Affiliation(s)
- Wei Yu
- Department of Intensive Care Unit, First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Wei Yang
- Department of Intensive Care Unit, First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Ming-Yan Zhao
- Department of Intensive Care Unit, First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Xiang-Lin Meng
- Department of Intensive Care Unit, First Affiliated Hospital of Harbin Medical University, Harbin, China
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6
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Hamatani H, Eng DG, Kaverina NV, Gross KW, Freedman BS, Pippin JW, Shankland SJ. Lineage tracing aged mouse kidneys shows lower number of cells of renin lineage and reduced responsiveness to RAAS inhibition. Am J Physiol Renal Physiol 2018; 315:F97-F109. [PMID: 29412700 PMCID: PMC6087792 DOI: 10.1152/ajprenal.00570.2017] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/05/2018] [Accepted: 02/05/2018] [Indexed: 11/22/2022] Open
Abstract
Blocking the renin-angiotensin-aldosterone system (RAAS) remains a mainstay of therapy in hypertension and glomerular diseases. With the population aging, our understanding of renin-producing cells in kidneys with advanced age is more critical than ever. Accordingly, we administered tamoxifen to Ren1cCreERxRs-tdTomato-R mice to permanently fate map cells of renin lineage (CoRL). The number of Td-tomato-labeled CoRL decreased significantly in aged mice (24 mo of age) compared with young mice (3.5 mo of age), as did renin mRNA levels. To determine whether aged CoRL responded less to RAAS blockade, enalapril and losartan were administered over 25 days following uninephrectomy in young and aged mice. The number of CoRL increased in young mice in response to enalapril and losartan. However, this was significantly lower in aged mice compared with young mice due to limited proliferation, but not recruitment. Gene expression analysis of laser-captured CoRL showed a substantial increase in mRNA levels for proapoptotic and prosenescence genes, and an increase in a major prosenescence protein on immunostaining. These results show that CoRL are lower in aged mice and do not respond to RAAS inhibition to the same extent as young mice.
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Affiliation(s)
- Hiroko Hamatani
- Division of Nephrology, University of Washington School of Medicine , Seattle, Washington
| | - Diana G Eng
- Division of Nephrology, University of Washington School of Medicine , Seattle, Washington
| | - Natalya V Kaverina
- Division of Nephrology, University of Washington School of Medicine , Seattle, Washington
| | - Kenneth W Gross
- Department of Molecular and Cellular Biology, Roswell Park Cancer Institute , Buffalo, New York
| | - Benjamin S Freedman
- Division of Nephrology, University of Washington School of Medicine , Seattle, Washington
| | - Jeffrey W Pippin
- Division of Nephrology, University of Washington School of Medicine , Seattle, Washington
| | - Stuart J Shankland
- Division of Nephrology, University of Washington School of Medicine , Seattle, Washington
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7
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Angiotensin II type 2 receptor (AT2R) in renal and cardiovascular disease. Clin Sci (Lond) 2017; 130:1307-26. [PMID: 27358027 DOI: 10.1042/cs20160243] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 05/06/2016] [Indexed: 12/14/2022]
Abstract
Angiotensin II (Ang II) is well-considered to be the principal effector of the renin-angiotensin system (RAS), which binds with strong affinity to the angiotensin II type 1 (AT1R) and type 2 (AT2R) receptor subtype. However, activation of both receptors is likely to stimulate different signalling mechanisms/pathways and produce distinct biological responses. The haemodynamic and non-haemodynamic effects of Ang II, including its ability to regulate blood pressure, maintain water-electrolyte balance and promote vasoconstriction and cellular growth are well-documented to be mediated primarily by the AT1R. However, its biological and functional effects mediated through the AT2R subtype are still poorly understood. Recent studies have emphasized that activation of the AT2R regulates tissue and organ development and provides in certain context a potential counter-regulatory mechanism against AT1R-mediated actions. Thus, this review will focus on providing insights into the biological role of the AT2R, in particular its actions within the renal and cardiovascular system.
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8
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Crowley SD, Rudemiller NP. Immunologic Effects of the Renin-Angiotensin System. J Am Soc Nephrol 2017; 28:1350-1361. [PMID: 28151411 DOI: 10.1681/asn.2016101066] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Inappropriate activation of the renin-angiotensin system (RAS) exacerbates renal and vascular injury. Accordingly, treatment with global RAS antagonists attenuates cardiovascular risk and slows the progression of proteinuric kidney disease. By reducing BP, RAS inhibitors limit secondary immune activation responding to hemodynamic injury in the target organ. However, RAS activation in hematopoietic cells has immunologic effects that diverge from those of RAS stimulation in the kidney and vasculature. In preclinical studies, activating type 1 angiotensin (AT1) receptors in T lymphocytes and myeloid cells blunts the polarization of these cells toward proinflammatory phenotypes, protecting the kidney from hypertensive injury and fibrosis. These endogenous functions of immune AT1 receptors temper the pathogenic actions of renal and vascular AT1 receptors during hypertension. By counteracting the effects of AT1 receptor stimulation in the target organ, exogenous administration of AT2 receptor agonists or angiotensin 1-7 analogs may similarly limit inflammatory injury to the heart and kidney. Moreover, although angiotensin II is the classic effector molecule of the RAS, several RAS enzymes affect immune homeostasis independently of canonic angiotensin II generation. Thus, as reviewed here, multiple components of the RAS signaling cascade influence inflammatory cell phenotype and function with unpredictable and context-specific effects on innate and adaptive immunity.
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Affiliation(s)
- Steven D Crowley
- Division of Nephrology, Department of Medicine, Durham Veterans Affairs and Duke University Medical Centers, Durham, North Carolina
| | - Nathan P Rudemiller
- Division of Nephrology, Department of Medicine, Durham Veterans Affairs and Duke University Medical Centers, Durham, North Carolina
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9
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Ge P, Jiang R, Yao X, Li J, Dai J, Zhang L, Ye B. The angiotensin-converting enzyme inhibitor captopril rescues mice from endotoxin-induced lethal hepatitis. Innate Immun 2016; 23:128-135. [DOI: 10.1177/1753425916680037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The renin–angiotensin system is classically regarded as a crucial regulator of circulatory homeostasis, but recent studies also revealed its pro-inflammatory roles. The beneficial effects of the angiotensin-converting enzyme inhibitor (ACEI) in severe inflammatory injury in the lung and heart have been previously reported, but its potential effects on lethal hepatitis were unknown. In this study, a mouse model with LPS/d-galactosamine (GalN)-induced fulminant hepatitis were used to test the protective potential of captopril, a representative ACEI. The results indicated that treatment with captopril significantly decreased the plasma level of alanine aminotransferase and aspartate aminotransferase, alleviated the histopathological damage of the liver tissue and improve the survival rate of LPS/GalN-challenged mice. These effects were accompanied by reduced mRNA levels of TNF-α and IL-6 in the liver, and decreased protein level of TNF-α and IL-6 in the plasma. In addition, the activation of caspases 3, 8 and 9, and the presence of TUNEL-positive apoptotic cells, were also suppressed by captopril treatment. The above evidence suggested that the renin–angiotensin system might be involved in the development of LPS/GalN-induced fulminant hepatitis and ACEI might have potential value in lethal hepatitis.
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Affiliation(s)
- Pu Ge
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
| | - Rong Jiang
- Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Xin Yao
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
| | - Jing Li
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
- Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Jie Dai
- Hospital of Chongqing University of Arts and Sciences, Chongqing, China
| | - Li Zhang
- Department of Pathophysiology, Chongqing Medical University, Chongqing, China
- Laboratory of Stem Cell and Tissue Engineering, Chongqing Medical University, Chongqing, China
| | - Bin Ye
- Department of Pathogenic Biology, Chongqing Medical University, Chongqing, China
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10
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Lichtnekert J, Kaverina NV, Eng DG, Gross KW, Kutz JN, Pippin JW, Shankland SJ. Renin-Angiotensin-Aldosterone System Inhibition Increases Podocyte Derivation from Cells of Renin Lineage. J Am Soc Nephrol 2016; 27:3611-3627. [PMID: 27080979 DOI: 10.1681/asn.2015080877] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 02/20/2016] [Indexed: 12/17/2022] Open
Abstract
Because adult podocytes cannot proliferate and are therefore unable to self-renew, replacement of these cells depends on stem/progenitor cells. Although podocyte number is higher after renin-angiotensin-aldosterone system (RAAS) inhibition in glomerular diseases, the events explaining this increase are unclear. Cells of renin lineage (CoRL) have marked plasticity, including the ability to acquire a podocyte phenotype. To test the hypothesis that RAAS inhibition partially replenishes adult podocytes by increasing CoRL number, migration, and/or transdifferentiation, we administered tamoxifen to Ren1cCreERxRs-tdTomato-R CoRL reporter mice to induce permanent labeling of CoRL with red fluorescent protein variant tdTomato. We then induced experimental FSGS, typified by abrupt podocyte depletion, with a cytopathic antipodocyte antibody. RAAS inhibition by enalapril (angiotensin-converting enzyme inhibitor) or losartan (angiotensin-receptor blocker) in FSGS mice stimulated the proliferation of CoRL, increasing the reservoir of these cells in the juxtaglomerular compartment (JGC). Compared with water or hydralazine, RAAS inhibition significantly increased the migration of CoRL from the JGC to the intraglomerular compartment (IGC), with more glomeruli containing RFP+CoRL and, within these glomeruli, more RFP+CoRL. Moreover, RAAS inhibition in FSGS mice increased RFP+CoRL transdifferentiation in the IGC to phenotypes, consistent with those of podocytes (coexpression of synaptopodin and Wilms tumor protein), parietal epithelial cells (PAX 8), and mesangial cells (α8 integrin). These results show that in the context of podocyte depletion in FSGS, RAAS inhibition augments CoRL proliferation and plasticity toward three different glomerular cell lineages.
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Affiliation(s)
| | | | | | - Kenneth W Gross
- Department of Molecular and Cellular Biology, Roswell Park Cancer Institute, Buffalo, New York
| | - J Nathan Kutz
- Department of Applied Mathematics, University of Washington, Seattle, Washington; and
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11
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Peña C, Hernández-Fonseca JP, Pedreañez A, Viera N, Mosquera J. Renal oxidative stress and renal CD8(+) T-cell infiltration in mercuric chloride-induced nephropathy in rats: role of angiotensin II. J Immunotoxicol 2015; 13:324-34. [PMID: 26536500 DOI: 10.3109/1547691x.2015.1089960] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Mercuric chloride (HgCl2) induces kidney damage, in part, through oxidative stress. A role for angiotensin II (Ang II) in pro-inflammatory events in a model of acute HgCl2-induced nephropathy was reported. Ang II is a potent oxidative stress inducer; however, its role in oxidative/anti-oxidative events in HgCl2-induced nephropathy remains unknown. The aim of this study was to determine the role of Ang II in the oxidative stress and renal infiltration of CD8(+) T-cells after an acute HgCl2 intoxication. Three groups of Sprague Dawley rats were treated with a single subcutaneous dose of 2.5 mg/kg HgCl2: for 3 days prior to and for 4 days after that injection, rats in one group received Losartan (30 mg/kg), in another group Enalapril (30 mg/kg) or normal saline in the last group. Two other groups of drug-treated rats received saline in place of HgCl2. A final group of rats received saline in place of HgCl2 and the test drugs. All treatments were via gastric gavage. At 96 h after the vehicle/HgCl2 injection, blood and kidney samples were harvested. Renal sections were homogenized for measures of malondialdehyde (MDA), reduced glutathione (GSH) and catalase activity. Frozen sections were studied for the presence of superoxide anion ([Formula: see text]) and CD8(+) T-cells. HgCl2-treated rats had increased interstitial and tubular expression of [Formula: see text], high levels of MDA, normal catalase activity and GSH content, increased levels of interstitial CD8(+) T-cells and an increased percentage of necrotic tubules. Anti-Ang II treatments diminished the HgCl2-induced increases in interstitial [Formula: see text], CD8(+) T-cells and tubular damage and increased catalase and GSH expression above that due to HgCl2 alone; the HgCl2-induced high MDA levels were unaffected by the drugs. These data provide new information regarding the potential role of Ang II in the oxidative stress and renal CD8(+) T-cell infiltration that occur during HgCl2 nephropathy.
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Affiliation(s)
- Caterina Peña
- a Department of Genetics , School of Bioanalysis, Faculty of Medicine, Universidad of Zulia , Maracaibo , Venezuela
| | - Juan P Hernández-Fonseca
- b Dr. Américo Negrette Institute for Clinical Investigation, Faculty of Medicine, Universidad of Zulia , Maracaibo , Venezuela
| | - Adriana Pedreañez
- c Department of Immunology , School of Bioanalysis, Faculty of Medicine, Universidad of Zulia , Maracaibo , Venezuela and
| | - Ninoska Viera
- d Institute for Investigation, Faculty of Odontology, Universidad of Zulia , Maracaibo , Venezuela
| | - Jesús Mosquera
- b Dr. Américo Negrette Institute for Clinical Investigation, Faculty of Medicine, Universidad of Zulia , Maracaibo , Venezuela
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12
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Tudorache E, Azema C, Hogan J, Wannous H, Aoun B, Decramer S, Deschênes G, Ulinski T. Even mild cases of paediatric Henoch-Schönlein purpura nephritis show significant long-term proteinuria. Acta Paediatr 2015; 104:843-8. [PMID: 24946692 DOI: 10.1111/apa.12723] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Revised: 05/15/2014] [Accepted: 06/17/2014] [Indexed: 10/25/2022]
Abstract
AIM Henoch-Schonlein purpura (HSP) is a common cause of paediatric renal disease in children, representing 10-15% of paediatric glomerulonephritis. This study examined the long-term outcome of biopsy-proven HSP nephritis to identify correlations between disease development and treatment. METHODS Patients from three French centres were retrospectively analysed. RESULTS We followed up 142 patients aged from 2 to 10.5 years with HSP nephritis, graded according to the International Study Group of Kidney Disease in Childhood classification. Mean (±SD) age at presentation was 7.6 ± 2.8 years. Nephrotic range proteinuria was present in 28% of patients with Grade II lesions, 60% with Grade III and 90% with Grade IV. Significant proteinuria (>0.5 g/L) was found in nine of 48 patients 3 years after renal biopsy, eight of 25 patients after 5 years and three of 14 patients after 10 years. There was no correlation between the proteinuria risk at 3, 5 or 10 years and the initial histological lesion or treatment modality. Treatment with angiotensin-converting enzyme inhibitors/angiotensin receptor blockers (ACEi/ARB) was linked to lower proteinuria, especially if it was started precociously. CONCLUSION Even mild forms of HSP nephritis risk significant long-term proteinuria. Very early introduction of ACEi/ARB may improve the long-term outcome independent of histological lesions.
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Affiliation(s)
- Elena Tudorache
- Department of Paediatric Nephrology; Armand-Trousseau Hospital; APHP; Paris France
- University Pierre and Marie Curie; Paris France
| | - Christine Azema
- Department of Paediatric Nephrology; Armand-Trousseau Hospital; APHP; Paris France
| | - Julien Hogan
- Department of Paediatric Nephrology; Armand-Trousseau Hospital; APHP; Paris France
| | - Hala Wannous
- Department of Paediatric Nephrology; Armand-Trousseau Hospital; APHP; Paris France
| | - Bilal Aoun
- Department of Paediatric Nephrology; Armand-Trousseau Hospital; APHP; Paris France
| | | | - Georges Deschênes
- Department of Paediatric Nephrology; Robert-Debré Hospital; APHP; Paris France
- University Paris-Diderot; Paris France
| | - Tim Ulinski
- Department of Paediatric Nephrology; Armand-Trousseau Hospital; APHP; Paris France
- University Pierre and Marie Curie; Paris France
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Narumi K, Hirose T, Sato E, Mori T, Kisu K, Ishikawa M, Totsune K, Ishii T, Ichihara A, Nguyen G, Sato H, Ito S. A functional (pro)renin receptor is expressed in human lymphocytes and monocytes. Am J Physiol Renal Physiol 2014; 308:F487-99. [PMID: 25503726 DOI: 10.1152/ajprenal.00206.2014] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The renin-angiotensin system (RAS) is involved in inflammation. The signaling via the ANG II type 1 receptor in human lymphocytes and monocytes, which play key roles in pathophysiology of glomerulonephritis (GN), can enhance inflammation. However, the role of the (pro)renin receptor [(P)RR], a component of the RAS, in inflammatory reactions is unknown. We assessed whether (P)RR is expressed in human lymphocytes and monocytes by RT-PCR, Western blotting, flow cytometry, and immunohistochemistry, and whether (P)RR functions in inflammation. (P)RR mRNA and protein were expressed in human peripheral blood mononuclear cells (PBMCs). Flow cytometric analysis revealed high expression of (P)RR on monocytes. (P)RR was present on PBMCs, infiltrating lymphocytes, and macrophages around glomeruli with a crescent in anti-neutrophil cytoplasmic antibody (ANCA)-associated GN. Renin stimulation of PBMCs from healthy subjects in the presence of the ANG II type 1 receptor and ANG II type 2 receptor blockers induced ERK1/2 phosphorylation and release of IL-6 and expression of cyclooxygenase-2 (COX-2). The increases in cytokine release and COX-2 expression were inhibited in the presence of an ERK1/2 inhibitor. (P)RR knockdown by small interfering RNA in U937 cells, a human leukemic monocyte lymphoma cell line, significantly decreased ERK1/2 phosphorylation after renin stimulation. Thus (P)RR expressed in human inflammatory cells might contribute to inflammation in ANCA-associated GN.
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Affiliation(s)
- Kaori Narumi
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Takuo Hirose
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Center for Interdisciplinary Research in Biology (CIRB), College de France, and CNRS UMR 7241 and INSERM U1050, Paris, France
| | - Emiko Sato
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Science, Sendai, Japan;
| | - Takefumi Mori
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Integrative Renal Replacement Therapy, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kiyomi Kisu
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Mayuko Ishikawa
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kazuhito Totsune
- Department of Social Welfare, Faculty of Synthetic Welfare, Tohoku Fukushi University, Sendai, Japan; Department of Planning for Drug Development and Clinical Evaluation, Tohoku University Graduate School of Pharmaceutical Science and Medicine, Sendai, Japan
| | - Tomonori Ishii
- Department of Hematology and Rheumatology, Department of Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; and
| | - Atsuhiro Ichihara
- Department of Endocrinology and Hypertension, Tokyo Women's Medical University, Tokyo, Japan
| | - Genevieve Nguyen
- Center for Interdisciplinary Research in Biology (CIRB), College de France, and CNRS UMR 7241 and INSERM U1050, Paris, France
| | - Hiroshi Sato
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Department of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Science, Sendai, Japan
| | - Sadayoshi Ito
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Integrative Renal Replacement Therapy, Tohoku University Graduate School of Medicine, Sendai, Japan
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14
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Zhang J, Yanez D, Floege A, Lichtnekert J, Krofft RD, Liu ZH, Pippin JW, Shankland SJ. ACE-inhibition increases podocyte number in experimental glomerular disease independent of proliferation. J Renin Angiotensin Aldosterone Syst 2014; 16:234-48. [PMID: 25143333 PMCID: PMC4412792 DOI: 10.1177/1470320314543910] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Objective The objective of this article is to test the effects of angiotensin-converting enzyme (ACE)-inhibition on glomerular epithelial cell number in an inducible experimental model of focal segmental glomerulosclerosis (FSGS). Background Although ACE-inhibition has been shown to limit podocyte loss by enhancing survival, little is known about its effect on podocyte number following an abrupt decline in disease. Methods Experimental FSGS was induced with cytotoxic antipodocyte antibody. Following induction, groups were randomized to receive the ACE-inhibitor enalapril, the smooth muscle relaxant hydralazine (blood pressure control) or drinking water. Blood pressure, kidney function and histology were measured seven and 14 days following disease induction. Results Both glomerulosclerosis and urinary albumin-to-creatinine ratio were less in the ACE-inhibition arm at day 14. At day 7 of disease, mean podocyte numbers were 26% and 29% lower in the enalapril and hydralazine arms, respectively, compared to normal mice in which no antibody was injected. At day 14, the mean podocyte number was only 18% lower in the enalapril arm, but was 39% lower in the hydralazine arm compared to normal mice. Podocyte proliferation did not occur at any time in any group. Compared to water- or hydralazine-treated mice with FSGS, the enalapril arm had a higher mean number of glomerular parietal epithelial cells that co-expressed the podocyte proteins WT-1 and synaptopodin, as well as phospho-ERK. Conclusion The results show following an abrupt decline in podocyte number, the initiation of ACE-inhibition but not hydralazine, was accompanied by higher podocyte number in the absence of proliferation. This was accompanied by a higher number of parietal epithelial cells that co-express podocyte proteins. Increasing podocyte number appears to be accompanied by reduced glomerulosclerosis.
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Affiliation(s)
- Jiong Zhang
- Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Washington Current address: Research Institute of Nephrology, Jinling Hospital, Nanjing University School of Medicine, China
| | - David Yanez
- Department of Biostatistics, School of Public Health, University of Washington, Washington
| | - Anna Floege
- Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Washington
| | - Julia Lichtnekert
- Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Washington
| | - Ronald D Krofft
- Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Washington
| | - Zhi-Hong Liu
- Research Institute of Nephrology, Jinling Hospital, Nanjing University School of Medicine, China
| | - Jeffrey W Pippin
- Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Washington
| | - Stuart J Shankland
- Division of Nephrology, Department of Medicine, University of Washington School of Medicine, Washington
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15
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Pichaiwong W, Hudkins KL, Wietecha T, Nguyen TQ, Tachaudomdach C, Li W, Askari B, Kobayashi T, O'Brien KD, Pippin JW, Shankland SJ, Alpers CE. Reversibility of structural and functional damage in a model of advanced diabetic nephropathy. J Am Soc Nephrol 2013; 24:1088-102. [PMID: 23641056 DOI: 10.1681/asn.2012050445] [Citation(s) in RCA: 130] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The reversibility of diabetic nephropathy remains controversial. Here, we tested whether replacing leptin could reverse the advanced diabetic nephropathy modeled by the leptin-deficient BTBR ob/ob mouse. Leptin replacement, but not inhibition of the renin-angiotensin-aldosterone system (RAAS), resulted in near-complete reversal of both structural (mesangial matrix expansion, mesangiolysis, basement membrane thickening, podocyte loss) and functional (proteinuria, accumulation of reactive oxygen species) measures of advanced diabetic nephropathy. Immunohistochemical labeling with the podocyte markers Wilms tumor 1 and p57 identified parietal epithelial cells as a possible source of regenerating podocytes. Thus, the leptin-deficient BTBR ob/ob mouse provides a model of advanced but reversible diabetic nephropathy for further study. These results also suggest that restoration of lost podocytes is possible but is not induced by RAAS inhibition, possibly explaining the limited efficacy of RAAS inhibitors in promoting repair of diabetic nephropathy.
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16
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Wallace E, Gewin L. Imatinib: Novel Treatment of Immune-Mediated Kidney Injury. J Am Soc Nephrol 2013; 24:694-701. [DOI: 10.1681/asn.2012080818] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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17
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Meek RL, LeBoeuf RC, Saha SA, Alpers CE, Hudkins KL, Cooney SK, Anderberg RJ, Tuttle KR. Glomerular cell death and inflammation with high-protein diet and diabetes. Nephrol Dial Transplant 2013; 28:1711-20. [PMID: 23314315 DOI: 10.1093/ndt/gfs579] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Overfeeding amino acids (AAs) increases cellular exposure to advanced glycation end-products (AGEs), a mechanism for protein intake to worsen diabetic kidney disease (DKD). This study assessed receptor for AGE (RAGE)-mediated apoptosis and inflammation in glomerular cells exposed to metabolic stressors characteristic of high-protein diets and/or diabetes in vitro with proof-of-concept appraisal in vivo. METHODS Mouse podocytes and mesangial cells were cultured under control and metabolic stressor conditions: (i) no addition; (ii) increased AAs (4-6-fold>control); (iii) high glucose (HG, 30.5 mM); (iv) AA/HG combination; (v) AGE-bovine serum albumin (AGE-BSA, 300 µg/mL); (vi) BSA (300 µg/mL). RAGE was inhibited by blocking antibody. Diabetic (streptozotocin) and nondiabetic mice (C57BL/6J) consumed diets with protein calories of 20 or 40% (high) for 20 weeks. People with DKD and controls provided 24-h urine samples. RESULTS In podocytes and mesangial cells, apoptosis (caspase 3/7 activity and TUNEL) increased in all metabolic stressor conditions. Both inflammatory mediator expression (real-time reverse transcriptase-polymerase chain reaction: serum amyloid A, caspase-4, inducible nitric oxide synthase, and monocyte chemotactic protein-1) and RAGE (immunostaining) also increased. RAGE inhibition prevented apoptosis and inflammation in podocytes. Among mice fed high protein, podocyte number (WT-1 immunostaining) decreased in the diabetic group, and only these diabetic mice developed albuminuria. Protein intake (urea nitrogen) correlated with AGE excretion (carboxymethyllysine) in people with DKD and controls. CONCLUSIONS High-protein diet and/or diabetes-like conditions increased glomerular cell death and inflammation, responses mediated by RAGEs in podocytes. The concept that high-protein diets exacerbate early indicators of DKD is supported by data from mice and people.
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Affiliation(s)
- Rick L Meek
- Providence Medical Research Center, Providence Sacred Heart Medical Center, Spokane, WA, USA.
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18
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Seeland U, Regitz-Zagrosek V. Sex and gender differences in cardiovascular drug therapy. Handb Exp Pharmacol 2013:211-36. [PMID: 23027453 DOI: 10.1007/978-3-642-30726-3_11] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
This chapter outlines sex differences in pharmacokinetics and pharmacodynamics of the most frequently used drugs in cardiovascular diseases, e.g., coronary artery disease, hypertension, heart failure. Retrospective analysis of previously published drug trials revealed marked sex differences in efficacy and adverse effects in a number of cardiovascular drugs. This includes a higher mortality among women taking digoxin for heart failure, more torsade de pointes arrhythmia in QT prolonging drugs and more cough with ACE inhibitors. Trends towards a greater benefit for women and/or female animals have been observed in some studies for endothelin receptor antagonists, the calcium channel blocker amlodipine, the ACE-inhibitor ramipril and the aldosterone antagonist eplerenone. However, reproduction of these results in independent studies and solid statistical evidence is still lacking. Some drugs require a particularly careful dose adaptation in women: the beta-blocker metoprolol, the calcium channel blocker verapamil, loop-, and thiazide diuretics. In conclusion, sex differences in pharmacokinetics and pharmacodynamics have to be taken into account for cardiovascular drug therapy in women.
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Affiliation(s)
- Ute Seeland
- Institute of Gender in Medicine, Universitaetsmedizin Berlin Charité, Berlin, Germany
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19
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Peña C, Hernández-Fonseca JP, Rincón J, Pedreañez A, Viera N, Mosquera J. Pro-inflammatory role of angiotensin II in mercuric chloride-induced nephropathy in rats. J Immunotoxicol 2012; 10:125-32. [PMID: 22822941 DOI: 10.3109/1547691x.2012.699478] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Mercuric chloride (HgCl₂), which induces kidney toxicity, constitutes a potential threat to human health. In addition to direct toxic effects, kidney inflammatory events take place during the HgCl₂-induced nephropathy. There is no information currently available about the role of angiotensin II (Ang II) in this inflammatory process. Accordingly, the aim of this study was to determine the expression of Ang II and Ang II-associated inflammatory molecules, i.e. intercellular adhesion molecule-1 (ICAM-1), inducible nitric oxide synthase (iNOS), and mono-cyte/macrophage infiltration (ED-1), in HgCl₂-induced nephropathy. Three groups of Sprague Dawley rats that were to receive HgCl₂ (2.5 mg HgCl₂/kg BW, by gavage) were utilized: one had received Losartan at 30 mg/kg BW; one had received Enalapril at 30 mg/kg BW; and one had received distilled water, in each case daily for 3 days prior to the HgCl₂ exposure. For these studies, an extra set of controls treated with saline solution in place of HgCl₂ and water in place of the test drugs was employed. Renal biopsies were obtained 96 h after HgCl₂ injection and the expressions of Ang II, ICAM-1, iNOS, and ED-1 were analyzed by indirect immunoflourescence while tubular damage was assessed via histopathology. An increased expression of Ang II, ICAM-1, iNOS, and ED-1 as well as increases in tubular necrosis were observed in all HgCl₂-animals. Treatments with Losartan or Enalapril diminished the induced expressions as well as the extent of tubular damage. The data here suggest that Ang II is involved in the pro-inflammatory events during HgCl₂-induced nephropathy, and that this is probably mediated, in part, by Ang II receptors Type 1 (AT-1).
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Affiliation(s)
- Caterina Peña
- Cátedra de Genética, Escuela de Bioanálisis, Facultad de Medicina, Universidad del Zulia, Maracaibo, Venezuela
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20
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Merino A, Alvarez-Lara MA, Ramirez R, Carracedo J, Martin-Malo A, Aljama P. Losartan prevents the development of the pro-inflammatory monocytes CD14+CD16+ in haemodialysis patients. Nephrol Dial Transplant 2012; 27:2907-12. [PMID: 22247233 DOI: 10.1093/ndt/gfr767] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND The principal cause of mortality in haemodialysis (HD) patients is cardiovascular disease, which is linked to chronic inflammation. Recent studies have demonstrated that angiotensin II receptor AT1 antagonists have anti-inflammatory properties. In this study, we evaluated the effect of losartan on CD14+CD16+ monocytes in HD patients. In addition, we developed an in vitro model to study the mechanisms by which losartan modulates these cells. METHODS We divided 18 HD patients into two groups, based on anti-hypertensive treatment: 9 patients were treated with losartan (losartan group) and 9 received other anti-hypertensive drugs that did not affect the renin-angiotensin axis (no-losartan group). Losartan was withdrawn in five patients from the losartan group for 2 months. Ten healthy subjects were included as controls. Invitro, we studied the differentiation of monocytes from healthy donors on stimulation with interleukin (IL)-10, IL-4 and granulocyte monocytes colony-stimulating factor with or without losartan in the culture medium. RESULTS In patients who were taking losartan, the percentage of monocytes that expressed CD14+CD16+ was lower compared with patients in the no-losartan group. The percentage of CD14+CD16+ was similar in the losartan group and healthy subjects. When losartan was withdrawn from five patients in the losartan group, the percentage of CD14+CD16+ monocytes increased compared with before withdrawal. In vitro, when we added losartan to the culture medium, CD14++CD16- monocytes failed to differentiate into CD14+CD16+ cells. CONCLUSION Losartan acts as an immunomodulator that prevents the development of CD14+CD16+ pro-inflammatory monocytes in HD patients.
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Affiliation(s)
- Ana Merino
- Instituto Maimónides de Investigación Biomédica de Córdoba (IMIBIC)/Fundación de Investigaciones Biomédicas de Córdoba (FIBICO), Córdoba, Spain.
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21
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Zhao H, Li M, Wang L, Su Y, Fang H, Lin J, Mohabeer N, Li D. Angiotensin II Induces TSLP via an AT1 Receptor/NF-KappaB Pathway, Promoting Th17 Differentiation. Cell Physiol Biochem 2012; 30:1383-97. [DOI: 10.1159/000343327] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2012] [Indexed: 12/28/2022] Open
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22
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Wallace E, Fogo AB, Schulman G. Imatinib Therapy for Non–Infection-Related Type II Cryoglobulinemia With Membranoproliferative Glomerulonephritis. Am J Kidney Dis 2012; 59:122-5. [DOI: 10.1053/j.ajkd.2011.08.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2011] [Accepted: 08/11/2011] [Indexed: 11/11/2022]
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Macrophages are essential contributors to kidney injury in murine cryoglobulinemic membranoproliferative glomerulonephritis. Kidney Int 2011; 80:946-958. [DOI: 10.1038/ki.2011.249] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Camici M, Carpi A, Cini G, Galetta F, Abraham N. Podocyte dysfunction in aging--related glomerulosclerosis. Front Biosci (Schol Ed) 2011; 3:995-1006. [PMID: 21622249 DOI: 10.2741/204] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
We review podocyte molecular structure and function, consider the underlying mechanisms related to podocyte dysfunction and propose that podocyte dysfunction be considered in the evaluation and management of age-associated glomerulosclerosis. With aging, progressive sympathetic activation, increased intrarenal renin-angiotensin system (RAS) activity, endothelin system and oxidative stress and reduced nitric oxide (NO)-availability can damage podocytes. Apoptosis and proliferation are the principal podocyte changes following injury with the latter leading to sclerosis and loss of nephrons. Podocyte loss can be evaluated by either determining their average number in biopsed glomeruli or by estimating podocyte number or their associated molecules in urine sediment. Podocyturia may be considered a marker of active glomerular disease. Preliminary data suggest that antiadrenergic drugs, angiotensin converting enzyme (ACE) inhibitors, RAS blocking drugs, endothelin system inhibitors and reduced oxidative stress can protect podocytes. Thus podocytes appear to play an important role in the pathogenesis, evaluation and therapy of age related glomerulosclerosis.
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Affiliation(s)
- Marcello Camici
- Department of Internal Medicine, Pisa University, Pisa, Italy
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25
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Enns LC, Bible KL, Emond MJ, Ladiges WC. Mice lacking the Cβ subunit of PKA are resistant to angiotensin II-induced cardiac hypertrophy and dysfunction. BMC Res Notes 2010; 3:307. [PMID: 21080942 PMCID: PMC2993729 DOI: 10.1186/1756-0500-3-307] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2010] [Accepted: 11/16/2010] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND PKA is a ubiquitous, multi-subunit cellular kinase that regulates a number of different physiological responses in response to cAMP, including metabolism, cell division, and cardiac function. Numerous studies have implicated altered PKA signaling in cardiac dysfunction. Recently, it has been shown that mice lacking the catalytic β subunit of PKA (PKA Cβ) are protected from age-related problems such as weight gain and enlarged livers, and we hypothesized that these mice might also be resistant to cardiomyopathy. FINDINGS Angiotensin II (ang II) induced hypertension in both PKA Cβ null mice and their WT littermates. However, PKA Cβ null mice were resistant to a number of ang II-induced, cardiopathological effects observed in the WT mice, including hypertrophy, decreased diastolic performance, and enlarged left atria. CONCLUSION The Cβ subunit of PKA plays an important role in angiotensin-induced cardiac dysfunction. The Cβ null mouse highlights the potential of the PKA Cβ subunit as a pharmaceutical target for hypertrophic cardiac disease.
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Affiliation(s)
- Linda C Enns
- Departments of Comparative Medicine, Physiology and Biophysics, and Biostatistics, University of Washington, Seattle, WA, 98195, USA
| | - Kenneth L Bible
- Departments of Comparative Medicine, Physiology and Biophysics, and Biostatistics, University of Washington, Seattle, WA, 98195, USA
| | - Mary J Emond
- Departments of Comparative Medicine, Physiology and Biophysics, and Biostatistics, University of Washington, Seattle, WA, 98195, USA
| | - Warren C Ladiges
- Departments of Comparative Medicine, Physiology and Biophysics, and Biostatistics, University of Washington, Seattle, WA, 98195, USA
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Hudkins KL, Pichaiwong W, Wietecha T, Kowalewska J, Banas MC, Spencer MW, Mühlfeld A, Koelling M, Pippin JW, Shankland SJ, Askari B, Rabaglia ME, Keller MP, Attie AD, Alpers CE. BTBR Ob/Ob mutant mice model progressive diabetic nephropathy. J Am Soc Nephrol 2010; 21:1533-42. [PMID: 20634301 DOI: 10.1681/asn.2009121290] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
There remains a need for robust mouse models of diabetic nephropathy (DN) that mimic key features of advanced human DN. The recently developed mouse strain BTBR with the ob/ob leptin-deficiency mutation develops severe type 2 diabetes, hypercholesterolemia, elevated triglycerides, and insulin resistance, but the renal phenotype has not been characterized. Here, we show that these obese, diabetic mice rapidly develop morphologic renal lesions characteristic of both early and advanced human DN. BTBR ob/ob mice developed progressive proteinuria beginning at 4 weeks. Glomerular hypertrophy and accumulation of mesangial matrix, characteristic of early DN, were present by 8 weeks, and glomerular lesions similar to those of advanced human DN were present by 20 weeks. By 22 weeks, we observed an approximately 20% increase in basement membrane thickness and a >50% increase in mesangial matrix. Diffuse mesangial sclerosis (focally approaching nodular glomerulosclerosis), focal arteriolar hyalinosis, mesangiolysis, and focal mild interstitial fibrosis were present. Loss of podocytes was present early and persisted. In summary, BTBR ob/ob mice develop a constellation of abnormalities that closely resemble advanced human DN more rapidly than most other murine models, making this strain particularly attractive for testing therapeutic interventions.
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Affiliation(s)
- Kelly L Hudkins
- Department of Pathology, University of Washington, Seattle, Washington, USA
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27
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Venegas-Pont M, Sartori-Valinotti JC, Glover PH, Reckelhoff JF, Ryan MJ. Sexual dimorphism in the blood pressure response to angiotensin II in mice after angiotensin-converting enzyme blockade. Am J Hypertens 2010; 23:92-6. [PMID: 19893496 DOI: 10.1038/ajh.2009.203] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND The incidence of hypertension and progression of renal disease are greater in men than in women. Data suggest that there is a dimorphic response to angiotensin II (Ang II) in rats, with male rats exhibiting a greater increase in mean arterial pressure (MAP) than females. However, during endogenous renin-angiotensin system (RAS) blockade with angiotensin-converting enzyme (ACE) inhibition, female rats have a greater MAP response to Ang II. We tested whether female mice exhibit a greater MAP response to chronic Ang II during ACE inhibition. METHODS Twenty-week-old male and female C57BL/6J mice (n > or = 6/group), treated with enalapril (40 mg/kg/day in drinking water), were assigned to groups receiving either Ang II (800 ng/kg/min) or saline for 2 weeks. Enalapril treatment began 4 days before and continued throughout the experiment. RESULTS MAP was higher in male mice than female mice treated with enalapril and Ang II (male: 144 +/- 3 vs. female: 121 +/- 6 mm Hg, P < 0.05) and was not different between mice treated with enalapril alone (male: 99 +/- 3 vs. female: 100 +/- 3 mm Hg). F2-isoprostanes were not increased by Ang II; however, female mice had significantly higher levels than males. Renal cortical expression of catalase and Cu/Zn-superoxide dismutase (SOD) was not different between experimental groups. Urinary protein was higher in male mice when compared to females, but was not changed after treatment with Ang II in either group. CONCLUSIONS These data suggest that there are species and sex-specific differences in the mechanism of the blood pressure response to Ang II, even during ACE inhibition.
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Guo S, Mühlfeld AS, Wietecha TA, Peutz-Kootstra CJ, Kowalewska J, Yi K, Spencer M, Pichaiwong W, Nimmerjahn F, Hudkins KL, Alpers CE. Deletion of activating Fcgamma receptors does not confer protection in murine cryoglobulinemia-associated membranoproliferative glomerulonephritis. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 175:107-18. [PMID: 19528347 DOI: 10.2353/ajpath.2009.081159] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Many types of glomerulonephritis are initiated by the deposition of immune complexes, which induce tissue injury via either engagement of Fc receptors on effector cells or via complement activation. Four murine Fcgamma receptors (FcgammaRs) have been identified at present. Ligand binding to FcgammaRI, III, and IV induces cell activation via the immunoreceptor tyrosine-based activation motif on the common gamma chain (FcRgamma). In this study, FcRgamma chain knockout (FcRgamma(-/-)) mice were crossed with thymic stromal lymphopoietin transgenic (TSLPtg) mice, which develop cryoglobulinemic membranoproliferative glomerulonephritis (MPGN). Female mice were studied at 30 and 50 days of age, when MPGN is in early and fully developed stages, respectively. Both TSLPtg and TSLPtg/FcRgamma(-/-) mice developed MPGN with massive glomerular immune deposits, mesangial cell proliferation, extensive mesangial matrix accumulation, and macrophage influx. TSLPtg/FcRgamma(-/-) mice had more glomerular immune complex deposits and higher levels of circulating cryoglobulins, IgG2a, IgG2b, and IgM, compared with TSLPtg mice. TSLPtg and TSLPtg/FcRgamma(-/-) mice developed similar levels of proteinuria. These results demonstrated that deletion of activating FcgammaRs does not confer protection in this model of immune complex-mediated MPGN. The findings contradict accepted paradigms on the role of activating FcgammaRs in promoting features of glomerulonephritis as seen in other model systems. We speculate engagement of FcgammaRs on cells such as monocytes/macrophages may be important for the clearance of deposited immune complexes and extracellular matrix proteins.
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Affiliation(s)
- Shunhua Guo
- Department of Pathology, University of Washington, Seattle, WA 98195, USA
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