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Bourg S, Rakotozandriny K, Lucas IT, Letavernier E, Bonhomme C, Babonneau F, Abou-Hassan A. Confining calcium oxalate crystal growth in a carbonated apatite-coated microfluidic channel to better understand the role of Randall's plaque in kidney stone formation. Lab Chip 2024; 24:2017-2024. [PMID: 38407354 DOI: 10.1039/d3lc01050c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
Effective prevention of recurrent kidney stone disease requires the understanding of the mechanisms of its formation. Numerous in vivo observations have demonstrated that a large number of pathological calcium oxalate kidney stones develop on an apatitic calcium phosphate deposit, known as Randall's plaque. In an attempt to understand the role of the inorganic hydroxyapatite phase in the formation and habits of calcium oxalates, we confined their growth under dynamic physicochemical and flow conditions in a reversible microfluidic channel coated with hydroxyapatite. Using multi-scale characterization techniques including scanning electron and Raman microscopy, we showed the successful formation of carbonated hydroxyapatite as found in Randall's plaque. This was possible due to a new two-step flow seed-mediated growth strategy which allowed us to coat the channel with carbonated hydroxyapatite. Precipitation of calcium oxalates under laminar flow from supersaturated solutions of oxalate and calcium ions showed that the formation of crystals is a substrate and time dependent complex process where diffusion of oxalate ions to the surface of carbonated hydroxyapatite and the solubility of the latter are among the most important steps for the formation of calcium oxalate crystals. Indeed when an oxalate solution was flushed for 24 h, dissolution of the apatite layer and formation of calcium carbonate calcite crystals occurred which seems to promote calcium oxalate crystal formation. Such a growth route has never been observed in vivo in the context of kidney stones. Under our experimental conditions, our results do not show any direct promoting role of carbonated hydroxyapatite in the formation of calcium oxalate crystals, consolidating therefore the important role that macromolecules can play in the process of nucleation and growth of calcium oxalate crystals on Randall's plaque.
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Affiliation(s)
- Samantha Bourg
- Laboratoire Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), CNRS, Sorbonne Université, UMR 8234, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France.
| | - Karol Rakotozandriny
- Laboratoire Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), CNRS, Sorbonne Université, UMR 8234, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France.
- Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), CNRS, Sorbonne Université, UMR 7574, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France
| | - Ivan T Lucas
- Laboratoire Interfaces et Systèmes Electrochimiques (LISE), CNRS, Sorbonne Université, UMR 8235, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France
| | - Emmanuel Letavernier
- AP-HP, Hôpital Tenon, Explorations Fonctionnelles Multidisciplinaires et Laboratoire des Lithiases, F-75020 Paris, France
| | - Christian Bonhomme
- Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), CNRS, Sorbonne Université, UMR 7574, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France
| | - Florence Babonneau
- Laboratoire de Chimie de la Matière Condensée de Paris (LCMCP), CNRS, Sorbonne Université, UMR 7574, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France
| | - Ali Abou-Hassan
- Laboratoire Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), CNRS, Sorbonne Université, UMR 8234, Campus Jussieu, 4 place Jussieu, F-75005 Paris, France.
- Institut Universitaire de France (IUF), 75231 Paris Cedex 05, France
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Zhu Z, Ruan S, Jiang Y, Huang F, Xia W, Chen J, Cui Y, He C, Zeng F, Li Y, Chen Z, Chen H. α-Klotho released from HK-2 cells inhibits osteogenic differentiation of renal interstitial fibroblasts by inactivating the Wnt-β-catenin pathway. Cell Mol Life Sci 2021; 78:7831-7849. [PMID: 34724098 DOI: 10.1007/s00018-021-03972-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 08/18/2021] [Accepted: 09/06/2021] [Indexed: 01/01/2023]
Abstract
Randall's plaques (RP) are well established as precursor lesions of idiopathic calcium oxalate (CaOx) stones, and the process of biomineralization driven by osteogenic-like cells has been highlighted in RP formation, but the mechanism is poorly understood. Given the inhibitory role of α-Klotho (KL), an aging suppressor protein with high expression in kidneys, in ectopic calcification and the close association between KL gene polymorphisms and urolithiasis susceptibility, we determined the potential role of KL in RP formation. This study found that both soluble KL (s-KL) and transmembrane KL (m-KL) were downregulated, and that s-KL but not m-KL was inversely correlated with upregulation of osteogenic markers in RP tissues. Additionally, s-KL expression was markedly suppressed in human renal interstitial fibroblasts (hRIFs) and slightly suppressed in HK-2 cells after osteogenic induction, intriguingly, which was echoed to the greater osteogenic capability of hRIFs than HK-2 cells. Further investigations showed the inhibitory effect of s-KL on hRIF osteogenic differentiation in vitro and in vivo. Moreover, coculture with recombinant human KL (r-KL) or HK-2 cells suppressed osteogenic differentiation of hRIFs, and this effect was abolished by coculture with KL-silenced HK-2 cells or the β-catenin agonist SKL2001. Mechanistically, s-KL inactivated the Wnt-β-catenin pathway by directly binding to Wnt2 and upregulating SFRP1. Further investigations identified activation of the Wnt-β-catenin pathway and downregulation of SFRP1 and DKK1 in RP tissues. In summary, this study identified s-KL deficiency as a pathological feature of RP and revealed that s-KL released from HK-2 cells inhibited osteogenic differentiation of hRIFs by inactivating the Wnt-β-catenin pathway, not only providing in-depth insight into the role of s-KL in renal interstitial biomineralization but also shedding new light on the interaction of renal tubular epithelial cells with interstitial cells to clarify RP formation.
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Affiliation(s)
- Zewu Zhu
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Shuhao Ruan
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Yingcheng Jiang
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Fang Huang
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Weiping Xia
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Jinbo Chen
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Yu Cui
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Cheng He
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Feng Zeng
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Yang Li
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China
| | - Zhiyong Chen
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China.
| | - Hequn Chen
- Department of Urology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, China.
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Miller DL, Ribeiro EA, Roy-Chowdhuri S, Illei PB, Siddiqui MT, Ali SZ. Renal medullary carcinoma involving serous cavity fluids: a cytomorphologic study of 12 cases. J Am Soc Cytopathol 2021; 10:187-196. [PMID: 32651128 DOI: 10.1016/j.jasc.2020.05.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION Renal medullary carcinoma (RMC) is a highly lethal adenocarcinoma with a propensity for widespread metastatic disease in young patients. It is strongly associated with sickle cell trait and shows the loss of SMARCB1 (also known as INI1 or BAF47) protein expression. In the present study, we reviewed a series of 12 patients for whom the cytology specimens played a significant role in patient treatment. MATERIALS AND METHODS We performed a retrospective case review of patients with a history of RMC from 3 large tertiary care pathology practices. RESULTS A total of 12 patients were identified with histologically confirmed RMC who had had pleural, pericardial, or urine specimens involved by their disease or had undergone initial kidney fine needle aspiration. Patient age ranged from 13 to 37 years (median, 21.5 years). All 12 patients were black or of African descent, and 10 had a confirmed history of sickle cell trait. Of the 12 patients, 11 (92%) had fluid specimens involved by metastatic tumor at some point in their clinical course, and 4 (33%) had initially presented with pericardial and/or pleural effusions or urine specimens that were positive for malignancy. Cytologic examination predominantly showed fragments of 3-dimensional "tumor balls" with smooth borders, fine pale cytoplasm with vacuolization, and highly pleomorphic nuclei with irregular nuclear membranes and coarse to vesicular chromatin and single prominent nucleoli. CONCLUSIONS The cytomorphology of RMC involving serous fluids is nonspecific and in keeping with metastatic high-grade adenocarcinoma. In a young patient presenting with no history of malignancy and a pleural or pericardial effusion, triaging the material for ancillary studies and a nuanced assessment of patient history and radiologic findings will be critical.
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Affiliation(s)
- Daniel L Miller
- Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Efrain A Ribeiro
- Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland
| | | | - Peter B Illei
- Department of Pathology, University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Momin T Siddiqui
- Department of Pathology and Laboratory Medicine, Weil Cornell Medicine, New York, New York
| | - Syed Z Ali
- Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland; Department of Radiology, The Johns Hopkins University School of Medicine, Baltimore, Maryland.
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Lozić M, Filipović N, Jurić M, Kosović I, Benzon B, Šolić I, Kelam N, Racetin A, Watanabe K, Katsuyama Y, Ogata M, Saraga-Babić M, Vukojević K. Alteration of Cx37, Cx40, Cx43, Cx45, Panx1, and Renin Expression Patterns in Postnatal Kidneys of Dab1-/- ( yotari) Mice. Int J Mol Sci 2021; 22:1284. [PMID: 33525532 PMCID: PMC7865779 DOI: 10.3390/ijms22031284] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/24/2021] [Accepted: 01/25/2021] [Indexed: 12/23/2022] Open
Abstract
Numerous evidence corroborates roles of gap junctions/hemichannels in proper kidney development. We analyzed how Dab1 gene functional silencing influences expression and localization of Cx37, Cx40, Cx43, Cx45, Panx1 and renin in postnatal kidneys of yotari mice, by using immunohistochemistry and electron microscopy. Dab1 Δ102/221 might lead to the activation of c-Src tyrosine kinase, causing the upregulation of Cx43 in the medulla of yotari mice. The expression of renin was more prominent in yotari mice (p < 0.001). Renin granules were unusually present inside the vascular walls of glomeruli capillaries, in proximal and distal convoluted tubules and in the medulla. Disfunction of Cx40 is likely responsible for increased atypically positioned renin cells which release renin in an uncontrolled fashion, but this doesn't rule out simultaneous involvement of other Cxs, such as Cx45 which was significantly increased in the yotari cortex. The decreased Cx37 expression in yotari medulla might contribute to hypertension reduction provoked by high renin expression. These findings imply the relevance of Cxs/Panx1 as markers of impaired kidney function (high renin) in yotari mice and that they have a role in the preservation of intercellular signaling and implicate connexopathies as the cause of premature death of yotari mice.
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Affiliation(s)
- Mirela Lozić
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Natalija Filipović
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Marija Jurić
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Ivona Kosović
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Benjamin Benzon
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Ivana Šolić
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Nela Kelam
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Anita Racetin
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
- Department of Medical Genetics, School of Medicine, University of Mostar, 88000 Mostar, Bosnia and Herzegovina
| | - Koichiro Watanabe
- Department of Anatomy, Shiga University of Medical Science, Ötsu 520-2192, Japan; (K.W.); (Y.K.)
| | - Yu Katsuyama
- Department of Anatomy, Shiga University of Medical Science, Ötsu 520-2192, Japan; (K.W.); (Y.K.)
| | - Masaki Ogata
- Division of Anatomy, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, 981-Miyagi 8558, Japan;
| | - Mirna Saraga-Babić
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
| | - Katarina Vukojević
- Department of Anatomy, Histology and Embryology, University of Split School of Medicine, 21000 Split, Croatia; (M.L.); (N.F.); (M.J.); (I.K.); (B.B.); (I.Š.); (N.K.); (A.R.); (M.S.-B.)
- Department of Medical Genetics, School of Medicine, University of Mostar, 88000 Mostar, Bosnia and Herzegovina
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Wang F, Wang S, Zhang Y, Li K, Harris RC, Gore JC, Zhang MZ. Noninvasive quantitative magnetization transfer MRI reveals tubulointerstitial fibrosis in murine kidney. NMR Biomed 2019; 32:e4128. [PMID: 31355979 PMCID: PMC6817372 DOI: 10.1002/nbm.4128] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 04/29/2019] [Accepted: 05/19/2019] [Indexed: 05/09/2023]
Abstract
Excessive tissue scarring, or fibrosis, is a critical contributor to end stage renal disease, but current clinical tests are not sufficient for assessing renal fibrosis. Quantitative magnetization transfer (qMT) MRI provides indirect information about the macromolecular composition of tissues. We evaluated measurements of the pool size ratio (PSR, the ratio of immobilized macromolecular to free water protons) obtained by qMT as a biomarker of tubulointerstitial fibrosis in a well-established murine model with progressive renal disease. MR images were acquired from 16-week-old fibrotic hHB-EGFTg/Tg mice and normal wild-type (WT) mice (N = 12) at 7 T. QMT parameters were derived using a two-pool five-parameter fitting model. A normal range of PSR values in the cortex and outer stripe of outer medulla (CR + OSOM) was determined by averaging across voxels within WT kidneys (mean ± 2SD). Regions in diseased mice whose PSR values exceeded the normal range above a threshold value (tPSR) were identified and measured. The spatial distribution of fibrosis was confirmed using picrosirius red stains. Compared with normal WT mice, scattered clusters of high PSR regions were observed in the OSOM of hHB-EGFTg/Tg mouse kidneys. Moderate increases in mean PSR (mPSR) of CR + OSOM regions were observed across fibrotic kidneys. The abnormally high PSR regions (% area) detected by the tPSR were significantly increased in hHB-EGFTg/Tg mice, and were highly correlated with regions of fibrosis detected by histological fibrosis indices measured from picrosirius red staining. Renal tubulointerstitial fibrosis in OSOM can thus be assessed by qMT MRI using an appropriate analysis of PSR. This technique may be used as an imaging biomarker for chronic kidney diseases.
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Affiliation(s)
- Feng Wang
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, TN, USA
| | - Suwan Wang
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Vanderbilt University, TN, USA
| | - Yahua Zhang
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Vanderbilt University, TN, USA
| | - Ke Li
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, TN, USA
| | - Raymond C. Harris
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Vanderbilt University, TN, USA
| | - John C. Gore
- Vanderbilt University Institute of Imaging Science, Vanderbilt University, TN, USA
- Department of Radiology and Radiological Sciences, Vanderbilt University, TN, USA
- Department of Biomedical Engineering, Vanderbilt University, TN, USA
| | - Ming-Zhi Zhang
- Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Vanderbilt University, TN, USA
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Yerneni H, Sedlacek M. Reverse corticomedullary differentiation in acute cortical necrosis. Kidney Int 2019; 96:1041. [PMID: 31543142 DOI: 10.1016/j.kint.2019.05.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 05/22/2019] [Indexed: 11/19/2022]
Affiliation(s)
- Himabindu Yerneni
- Division of Nephrology, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Martin Sedlacek
- Division of Nephrology, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire, USA.
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Dugbartey GJ, Quinn B, Luo L, Mickelsen DM, Ture SK, Morrell CN, Czyzyk J, Doyley MM, Yan C, Berk BC, Korshunov VA. The Protective Role of Natriuretic Peptide Receptor 2 against High Salt Injury in the Renal Papilla. Am J Pathol 2019; 189:1721-1731. [PMID: 31220449 PMCID: PMC6724224 DOI: 10.1016/j.ajpath.2019.05.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 05/11/2019] [Accepted: 05/28/2019] [Indexed: 12/20/2022]
Abstract
Mutations in natriuretic peptide receptor 2 (Npr2) gene cause a rare form of short-limbed dwarfism, but its physiological effects have not been well studied. Human and mouse genetic data suggest that Npr2 in the kidney plays a role in salt homeostasis. Herein, we described anatomic changes within renal papilla of Npr2 knockout (Npr2-/-) mice. Dramatic reduction was found in diuresis, and albuminuria was evident after administration of 1% NaCl in drinking water in Npr2-/- and heterozygous (Npr2+/-) mice compared with their wild-type (Npr2+/+) littermates. There was indication of renal epithelial damage accompanied by high numbers of red blood cells and inflammatory cells (macrophage surface glycoproteins binding to galectin-3) and an increase of renal epithelial damage marker (T-cell Ig and mucin domain 1) in Npr2-/- mice. Addition of 1% NaCl tended to increase apoptotic cells (cleaved caspase 3) in the renal papilla of Npr2-/- mice. In vitro, genetic silencing of the Npr2 abolished protective effects of C-type natriuretic peptide, a ligand for Npr2, against death of M-1 kidney epithelial cells exposed to 360 mmol/L NaCl. Finally, significantly lower levels of expression of the NPR2 protein were detected in renal samples of hypertensive compared with normotensive human subjects. Taken together, these findings suggest that Npr2 is essential to protect renal epithelial cells from high concentrations of salt and prevent kidney injury.
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Affiliation(s)
- George J Dugbartey
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Breandan Quinn
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Lingfeng Luo
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Deanne M Mickelsen
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Sara K Ture
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Craig N Morrell
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Jan Czyzyk
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, Minnesota
| | - Marvin M Doyley
- Department of Electrical and Computer Engineering, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Chen Yan
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York
| | - Bradford C Berk
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York; Department of Medicine, Neurorestoration Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York.
| | - Vyacheslav A Korshunov
- Aab Cardiovascular Research Institute, Hajim School of Engineering and Applied Sciences, University of Rochester, Rochester, New York.
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Christensen M, Schiffer TA, Gustafsson H, Krag SP, Nørregaard R, Palm F. Metformin attenuates renal medullary hypoxia in diabetic nephropathy through inhibition uncoupling protein-2. Diabetes Metab Res Rev 2019; 35:e3091. [PMID: 30345618 DOI: 10.1002/dmrr.3091] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 10/03/2018] [Accepted: 10/16/2018] [Indexed: 11/09/2022]
Abstract
BACKGROUND The purpose of the study is to examine the effect of metformin on oxygen metabolism and mitochondrial function in the kidney of an animal model of insulinopenic diabetes in order to isolate any renoprotective effect from any concomitant effect on blood glucose homeostasis. METHODS Sprague-Dawley rats were injected with streptozotocin (STZ) (50 mg kg-1 ) and when stable started on metformin treatment (250 mg kg-1 ) in the drinking water. Rats were prepared for in vivo measurements 25 to 30 days after STZ injection, where renal function, including glomerular filtration rate and sodium transport, was estimated in anesthetized rats. Intrarenal oxygen tension was measured using oxygen sensors. Furthermore, mitochondrial function was assessed in mitochondria isolated from kidney cortex and medulla analysed by high-resolution respirometry, and superoxide production was evaluated using electron paramagnetic resonance. RESULTS Insulinopenic rats chronically treated with metformin for 4 weeks displayed improved medullary tissue oxygen tension despite of no effect of metformin on blood glucose homeostasis. Metformin reduced UCP2-dependent LEAK and differentially affected medullary mitochondrial superoxide radical production in control and diabetic rats. CONCLUSIONS Metformin attenuates diabetes-induced renal medullary tissue hypoxia in an animal model of insulinopenic type 1 diabetes. The results suggest that the mechanistic pathway to attenuate the diabetes-induced medullary hypoxia is independent of blood glucose homeostasis and includes reduced UCP2-mediated mitochondrial proton LEAK.
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Affiliation(s)
| | - Tomas A Schiffer
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
| | - Håkan Gustafsson
- Department of Radiology Norrköping and Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
| | | | - Rikke Nørregaard
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Fredrik Palm
- Department of Medical Cell Biology, Uppsala University, Uppsala, Sweden
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9
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Dawman L, Sekar A, Varma TH, Nada R, Tiewsoh K. Snake bite-induced renal medullary angitiis in a child: A case report. Saudi J Kidney Dis Transpl 2019; 30:231-234. [PMID: 30804287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023] Open
Abstract
Snake bite envenomation is common in tropical countries during the summer. Snake bite-induced acute kidney injury (AKI) has varied histopathological manifestations such as acute cortical necrosis, acute tubular necrosis (ATN), and acute interstitial nephritis. However, snake bite-induced renal medullary angiitis has rarely been reported. We describe a nine-year-old child with AKI following viperine snake bite and renal biopsy revealed pigment cast nephropathy, ATN and medullary angiitis.
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Affiliation(s)
- Lesa Dawman
- Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Aravind Sekar
- Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Tandra Harish Varma
- Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Ritambhra Nada
- Department of Histopathology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
| | - Karalanglin Tiewsoh
- Department of Pediatrics, Postgraduate Institute of Medical Education and Research, Chandigarh, India
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Wang YC, Feng Y, Lu CQ, Ju S. Renal fat fraction and diffusion tensor imaging in patients with early-stage diabetic nephropathy. Eur Radiol 2018; 28:3326-3334. [PMID: 29450711 DOI: 10.1007/s00330-017-5298-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 12/17/2017] [Accepted: 12/29/2017] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To investigate the renal fat fraction and water molecular diffusion features in patients with early-stage DN using Dixon imaging and diffusion tensor imaging (DTI). METHODS Sixty-one type 2 diabetics (normoalbuminuria: n = 40; microalbuminuria: n = 21) and 34 non-diabetic volunteers were included. All participants received three-point Dixon imaging and DTI using a 3.0-T magnetic resonance imager. The fat fraction [FF] and DTI features [fractional anisotropy (FA), apparent diffusion coefficient (ADC), tract counts and length from DTI tractography] were collected. All image features were compared between cohorts using one-way ANOVA with Bonferroni post-hoc analysis. RESULTS Renal FF in the microalbuminuric group was significantly higher than in the normoalbuminuric and control groups (5.6% ± 1.3%, 4.7% ± 1.1% and 4.3% ± 0.5%, respectively; p < 0.001). Medullary FA in the microalbuminuric group was the lowest (0.31 ± 0.06) in all cohorts. The tract counts and length in the renal medulla were significantly lower in the microalbuminuric group than in the other two groups. CONCLUSIONS Dixon imaging and DTI are able to detect renal lipid deposition and water molecule diffusion abnormalities in patients with early-stage DN. Both techniques have the potential to noninvasively evaluate early renal impairment in type 2 diabetes. KEY POINTS • Dixon imaging demonstrated renal fat deposition in early-stage DN; • Renal fractional anisotropy decreased in patients with early-stage DN; • Renal tractography demonstrated reduced track counts and length in early-stage DN.
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Affiliation(s)
- Yuan-Cheng Wang
- Department of Radiology, Zhongda Hospital, Jiangsu Key Laboratory of Molecular and Functional Imaging, Zhongda Hospital, Medical School of Southeast University, 87 Ding Jia Qiao Road, Nanjing, 210009, China
| | - Yinglian Feng
- Department of Radiology, Zhongda Hospital, Jiangsu Key Laboratory of Molecular and Functional Imaging, Zhongda Hospital, Medical School of Southeast University, 87 Ding Jia Qiao Road, Nanjing, 210009, China
| | - Chun-Qiang Lu
- Department of Radiology, Zhongda Hospital, Jiangsu Key Laboratory of Molecular and Functional Imaging, Zhongda Hospital, Medical School of Southeast University, 87 Ding Jia Qiao Road, Nanjing, 210009, China
| | - Shenghong Ju
- Department of Radiology, Zhongda Hospital, Jiangsu Key Laboratory of Molecular and Functional Imaging, Zhongda Hospital, Medical School of Southeast University, 87 Ding Jia Qiao Road, Nanjing, 210009, China.
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11
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Wilk A, Wiszniewska B, Szypulska-Koziarska D, Kaczmarek P, Romanowski M, Różański J, Słojewski M, Ciechanowski K, Marchelek-Myśliwiec M, Kalisińska E. The Concentration of Vanadium in Pathologically Altered Human Kidneys. Biol Trace Elem Res 2017; 180:1-5. [PMID: 28275931 PMCID: PMC5610659 DOI: 10.1007/s12011-017-0986-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 02/26/2017] [Indexed: 11/30/2022]
Abstract
Vanadium has a unique and beneficial effect on both humans and animal organisms; however, excessive amount of the above-mentioned metal can cause many alterations in tissues and organs, including the kidneys. The aim of the study was to determine the concentration of vanadium (V) in the kidneys removed from patients due to lesions of various etiologies, including the rejection of the transplanted kidneys. Additionally, we determined the influence of selected biological and environmental factors on the V concentration. The study material consisted of the kidneys with tumor lesions (n = 27) and extracted kidney grafts (n = 10) obtained from patients from the north-western Poland. The V concentrations were assessed by atomic absorption spectrophotometry emission in inductively coupled argon plasma and expressed in concentrations in dry weight (dw). Statistically significant differences were observed for V concentrations in the renal medulla between the kidneys with tumors and renal grafts, where the lowest concentration of V was observed. The kidneys in more advanced stages of the tumor (T3 + T4) contained more vanadium than the kidneys of T1 + T2 stages and medians were 2.07 and 1.51, respectively. We also compared the V concentration in the kidneys between the renal grafts (K2) and the kidneys with tumor (K1) in two stages of advancement: T1 with T2 (K11 + 2) and T3 with T4 (K13 + 4). Statistically significant differences were noted between the renal medullae of the above-mentioned groups of kidneys.According to the previous studies on the concentrations of other heavy metals, renal grafts accumulate less vanadium than cancerous kidneys, what can be associated with the immunosuppressive drugs taken by patients after the transplantation.
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Affiliation(s)
- Aleksandra Wilk
- Department of Histology and Embryology, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland.
| | - Barbara Wiszniewska
- Department of Histology and Embryology, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Dagmara Szypulska-Koziarska
- Department of Histology and Embryology, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Paulina Kaczmarek
- Department of Histology and Embryology, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Maciej Romanowski
- Department of General Surgery and Transplantation, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Jacek Różański
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Marcin Słojewski
- Department of Urology and Urological Oncology, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Kazimierz Ciechanowski
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Małgorzata Marchelek-Myśliwiec
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Elżbieta Kalisińska
- Department of Biology and Medical Parasitology, Pomeranian Medical University, Al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
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12
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Wilk A, Kalisińska E, Kosik-Bogacka DI, Romanowski M, Różański J, Ciechanowski K, Słojewski M, Łanocha-Arendarczyk N. Cadmium, lead and mercury concentrations in pathologically altered human kidneys. Environ Geochem Health 2017; 39:889-899. [PMID: 27485407 DOI: 10.1007/s10653-016-9860-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 07/26/2016] [Indexed: 06/06/2023]
Abstract
Heavy metals, including cadmium (Cd), lead (Pb) and mercury (Hg) act as nephrotoxic agents, particularly in the renal cortex. The aim of the study was to determine the concentrations of Cd, Pb and Hg in kidneys removed from patients due to lesions of various etiologies and from patients after the rejection of transplanted kidneys. Additionally, we determined the influence of selected biological and environmental factors on the concentrations of toxic metals. The study material consisted of kidneys with tumor lesions (n = 27), without tumors (n = 7) and its extracted grafts (n = 10) obtained from patients belongs to the north-western areas of Poland. The determined metal concentrations in the renal cortex and medulla may be arranged in the following descending order: Cd > Pb > Hg. The highest concentrations of Cd and Hg were found in the cortex, while the maximum content Pb was observed in the medulla. Significant correlations were found in the concentrations of the same metals between cortex and medulla and between Pb and Hg in the renal medulla. Pb content was higher in the renal medulla of men than in the cortex of the elderly (above 60 years of age). The highest concentrations of Pb and Hg were found in the cortex and medulla, of the kidneys had not neoplastic changes, and lower content of these metals were found in the extracted kidney grafts. In summary, renal grafts accumulate less heavy metals than cancerous kidneys, what could have been caused by immunosuppressors taken by the graft recipients. Moreover, sex, age and smoking are key factors responsible for xenobiotics concentrations.
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Affiliation(s)
- Aleksandra Wilk
- Department of Biology and Medical Parasitology, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
- Department of Histology and Embryology, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Elżbieta Kalisińska
- Department of Biology and Medical Parasitology, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Danuta I Kosik-Bogacka
- Department of Biology and Medical Parasitology, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland.
| | - Maciej Romanowski
- Department of General Surgery and Transplantation, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Jacek Różański
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Kazimierz Ciechanowski
- Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Marcin Słojewski
- Department of Urology and Urological Oncology, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
| | - Natalia Łanocha-Arendarczyk
- Department of Biology and Medical Parasitology, Pomeranian Medical University, al. Powstańców Wielkopolskich 72, 70-111, Szczecin, Poland
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13
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Eirin A, Woollard JR, Ferguson CM, Jordan KL, Tang H, Textor SC, Lerman A, Lerman LO. The metabolic syndrome induces early changes in the swine renal medullary mitochondria. Transl Res 2017; 184:45-56.e9. [PMID: 28363084 PMCID: PMC5429873 DOI: 10.1016/j.trsl.2017.03.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 02/20/2017] [Accepted: 03/03/2017] [Indexed: 12/31/2022]
Abstract
The metabolic syndrome (MetS) is associated with nutrient surplus and kidney hyperfiltration, accelerating chronic renal failure. Mitochondria can be overwhelmed by substrate excess, leading to inefficient energy production and thereby tissue hypoxia. Mitochondrial dysfunction is emerging as an important determinant of renal damage, but whether it contributes to MetS-induced renal injury remains unknown. We hypothesized that early MetS induces kidney mitochondrial abnormalities and dysfunction, which would be notable in the vulnerable renal medulla. Pigs were studied after 16 weeks of diet-induced MetS, MetS treated for the last 4 weeks with the mitochondria-targeted peptide elamipretide (0.1 mg/kg SC q.d), and Lean controls (n = 7 each). Single-kidney renal blood flow, glomerular filtration rate, and oxygenation were measured in-vivo, whereas cortical and medullary mitochondrial structure and function and renal injurious pathways were studied ex-vivo. Blood pressure was slightly elevated in MetS pigs, and their renal blood flow and glomerular filtration rate were elevated. Blood oxygen level-dependent magnetic resonance imaging demonstrated that this was associated with medullary hypoxia, whereas cortical oxygenation remained intact. MetS decreased renal content of the inner mitochondrial membrane cardiolipin, particularly the tetra-linoleoyl (C18:2) cardiolipin species, and altered mitochondrial morphology and function, particularly in the medullary thick ascending limb. MetS also increased renal cytochrome-c-induced apoptosis, oxidative stress, and tubular injury. Chronic mitoprotection restored mitochondrial structure, ATP synthesis, and antioxidant defenses and decreased mitochondrial oxidative stress, medullary hypoxia, and renal injury. These findings implicate medullary mitochondrial damage in renal injury in experimental MetS, and position the mitochondria as a therapeutic target.
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Affiliation(s)
- Alfonso Eirin
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minn
| | - John R Woollard
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minn
| | | | - Kyra L Jordan
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minn
| | - Hui Tang
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minn
| | - Stephen C Textor
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minn
| | - Amir Lerman
- Cardiovascular Diseases, Mayo Clinic, Rochester, Minn
| | - Lilach O Lerman
- Division of Nephrology and Hypertension, Mayo Clinic, Rochester, Minn; Cardiovascular Diseases, Mayo Clinic, Rochester, Minn.
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14
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Khan HA, Ibrahim KE, Khan A, Alrokayan SH, Alhomida AS. Immunostaining of proinflammatory cytokines in renal cortex and medulla of rats exposed to gold nanoparticles. Histol Histopathol 2017; 32:597-607. [PMID: 27678417 DOI: 10.14670/hh-11-825] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Recently, gold nanoparticles (GNPs) have shown promising applications in targeted drug delivery and contrast imaging. Although in vitro cytotoxicity of GNPs has been thoroughly studied, there are limited data on in vivo toxicity of GNPs. In this study, we evaluated the effects of intraperitoneally injected 10 nm and 50 nm GNPs (5 μg/animal) on the expression of proinflammatory cytokines (IL-1β, IL-6 and TNF-α) on day 1 and day 5, post-exposure. The results of immunohistochemistry showed that both 10 nm and 50 nm GNPs induced an acute phase expression of proinflammatory cytokines in renal cortex and medulla. This proinflammatory response was comparatively more intense in renal medulla than cortex. All the three cytokines were undetectable in control cortex and medulla. In conclusion, both 10 nm and 50 nm GNPs caused an acute phase induction of proinflammatory cytokines in cortex and medulla of rat kidneys. An intense immunostaining of proinflammatory cytokines in renal medulla warrants further studies to evaluate the nephrotoxicity of GNPs to validate the safe application of GNPs for contrast imaging in renal insufficiency.
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Affiliation(s)
- Haseeb A Khan
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia.
| | - Khalid E Ibrahim
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Ayaat Khan
- Integral Institute of Medical Sciences and Research, Lucknow, India
| | - Salman H Alrokayan
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Abdullah S Alhomida
- Department of Biochemistry, College of Science, King Saud University, Riyadh, Saudi Arabia
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15
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O'Kell AL, Grant DC, Khan SR. Pathogenesis of calcium oxalate urinary stone disease: species comparison of humans, dogs, and cats. Urolithiasis 2017; 45:329-336. [PMID: 28361470 DOI: 10.1007/s00240-017-0978-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 03/23/2017] [Indexed: 01/09/2023]
Abstract
Idiopathic calcium oxalate nephrolithiasis is a highly recurrent disease that is increasing in prevalence. Decades of research have not identified effective methods to consistently prevent the formation of nephroliths or induce medical dissolution. Idiopathic calcium oxalate nephroliths form in association with renal papillary subepithelial calcium phosphate deposits called Randall's plaques (RPs). Rodent models are commonly used to experimentally induce calcium oxalate crystal and stone formation, but a rodent model that conclusively forms RPs has not been identified. Both dogs and cats form calcium oxalate uroliths that can be recurrent, but the etiopathologic mechanisms of stone formation, especially renal pathologic findings, are a relatively unexploited area of study. A large animal model that shares a similar environment to humans, along with a shorter lifespan and thus shorter time to recurrence, might provide an excellent means to study preventative and therapeutic measures, along with enhancing the concepts of the one health initiative. This review article summarizes and compares important known features of idiopathic calcium oxalate stone disease in humans, dogs, and cats, and emphasizes important knowledge gaps and areas for future study in the quest to discover a naturally occurring animal model of idiopathic calcium oxalate stone disease.
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Affiliation(s)
- Allison L O'Kell
- Department of Small Animal Clinical Sciences, The University of Florida, 2015 SW 16th Ave, PO Box 100126, Gainesville, FL, 32610, USA
- Department of Urology, The University of Florida, 1600 SW Archer Road, Gainesville, FL, 32610, USA
| | - David C Grant
- Department of Small Animal Clinical Sciences, Virginia Tech, 215 Duck Pond Drive, Blacksburg, VA, 24061, USA
| | - Saeed R Khan
- Department of Urology, The University of Florida, 1600 SW Archer Road, Gainesville, FL, 32610, USA.
- Department of Pathology, Immunology, and Laboratory Medicine, The University of Florida, 1600 SW Archer Road, Gainesville, FL, 32610, USA.
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16
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Marien TP, Miller NL. Characteristics of renal papillae in kidney stone formers. MINERVA UROL NEFROL 2016; 68:496-515. [PMID: 27441596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The mechanism of kidney stone formation is not well understood. In order to better understand the pathophysiology for specific kidney stone compositions and systemic diseases associated with kidney stones, endoscopic papillary mapping studies with concurrent biopsies have been conducted. This review will summarize the findings of these studies and proposed mechanisms for thirteen disease processes associated with kidney stones. A review of the literature was performed identifying thirteen studies that endoscopically mapped and biopsied renal papillae of different stone formers. These studies characterized renal papillae based on amount of Randall's plaque, Bellini's duct pathology, papillary contour changes, presence of attached stones, pitting, and frequently papillary and cortical biopsies. The groups studied and reviewed here are kidney stone formers who have a history of idiopathic calcium oxalate stone formation, cystinuria, brushite stones, gastric bypass, ileostomy, small bowel resection, primary hyperparathyroidism, distal renal tubular acidosis (dRTA), primary hyperoxaluria, idiopathic calcium phosphate stone formation, medullary sponge kidney (MSK), uric acid stones, and struvite stones. A proposed standardized scoring system for papillary pathology was also reviewed. The series showed various degrees and types of changes to the renal papillae and corresponding histopathologic changes for each type of stone former reviewed. Those with predominantly alone Randall's plaque pathology had less tissue damage versus those with extensive Bellini's duct lesions who had more interstitial fibrosis and cortical pathology. Randall's plaques are associated with stone formers who have low urinary volume, high urinary calcium, and acidic urine and thus are frequently seen in those with brushite stones, primary hyperparathyroidism, small bowel resection, and idiopathic calcium phosphate stone formers. Bellini's duct plugging and pathology is theorized to occur via free solution crystallization, ductal obstruction, inflammation, cellular injury, fibrosis, and acidification defects. Ureteroscopic manifestations of stone disease can vary from normal appearing papillae to significantly diseased appearing papillae. Some diseases have very characteristic papillary changes. Further studies are necessary to fully elucidate the mechanisms of stone formation in patients with nephrolithiasis.
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Affiliation(s)
- Tracy P Marien
- Department of Urologic Surgery, Vanderbilt Medical Center, Nashville, TN, USA -
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17
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Abstract
Purpose: To demonstrate the involvement of the various renal structures in acute tubular necrosis (ATN). Material and Methods: In 15 rats, using a T1-/T2-weighted sequence, either gadodiamide alone, or gadodiamide in combination with sprodiamide (a susceptibility agent) were used to enhance the various anatomical substrates of the kidney. The results were compared to those of pathological verification. Results: Experimentally induced ATN of the rat kidney causes profound changes in the medulla, leaving the cortex largely intact. The difference between the normal cortex and the partially necrotic outer medulla, on the one hand, and the papillary region, was significantly enhanced with the combination, whereas a larger region composed of the inner and outer medulla was enhanced after the gadolinium chelate alone. Conclusion: The results varied considerably between the two procedures; the double contrast demonstrated a clear difference between the inner and outer medulla, and the gadolinium chelate alone demonstrated a clear difference between the medulla and the cortex. These results demonstrated a clear difference in the compartmentalization between the inner and outer medullary regions, providing complementary information about the pathological condition of the kidney.
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Affiliation(s)
- B Dupas
- Department of Radiology and Medical Imaging, Centre Hospitalier Universitaire, Nantes, France
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18
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Wu KLH, Wu CW, Chao YM, Hung CY, Chan JYH. Impaired Nrf2 regulation of mitochondrial biogenesis in rostral ventrolateral medulla on hypertension induced by systemic inflammation. Free Radic Biol Med 2016; 97:58-74. [PMID: 27223823 DOI: 10.1016/j.freeradbiomed.2016.05.012] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 05/04/2016] [Accepted: 05/14/2016] [Indexed: 12/30/2022]
Abstract
Oxidative stress in rostral ventrolateral medulla (RVLM), where sympathetic premotor neurons reside, is involved in the development of hypertension under systemic inflammation. Mitochondrial dysfunction contributes to tissue oxidative stress. In this study, we sought to investigate whether hypertension developed under systemic inflammation is attributable to impaired mitochondrial biogenesis in RVLM. In normotensive Sprague-Dawley rats, intraperitoneal infusion of a low dose Escherichia coli lipopolysaccharide (LPS) for 7 days promoted a pressor response, alongside a decrease in mitochondrial DNA (mtDNA) copy number, reductions in protein expression of nuclear DNA-encoded transcription factors for mitochondrial biogenesis, including mitochondrial transcription factor A (TFAM) and nuclear factor erythroid-derived 2-like 2 (Nrf2), and suppression of nuclear translocation of the phosphorylated Nrf2 (p-Nrf2) in RVLM neurons; all of which were abrogated by treatment with intracisternal infusion of an interleukin-1β (IL-1β) blocker, IL-1Ra, or a mobile mitochondrial electron carrier, coenzyme Q10 (CoQ10). Microinjection into RVLM of IL-1β suppressed the expressions of p-Nrf2 and TFAM, and evoked a pressor response; conversely, the Nrf2 inducer, tert-butylhydroquinone, lessened the LPS-induced suppression of TFAM expression and pressor response. At cellular level, exposure of neuronal N2a cells to IL-1β decreased mtDNA copy number, increased protein interaction of Nrf2 to its negative regulator, kelch-like ECH-associated protein 1 (Keap1), and reduced DNA binding activity of p-Nrf2 to Tfam gene. Together these results indicate that defect mitochondrial biogenesis in RVLM neurons entailing redox-sensitive and IL-1β-dependent suppression of TFAM because of the increase in the formation of Keap1/Nrf2 complex, reductions in nuclear translocation of the activated Nrf2 and its binding to the Tfam gene promoter may underlie hypertension developed under the LPS-induced systemic inflammation.
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Affiliation(s)
- Kay L H Wu
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan
| | - Chih-Wei Wu
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan
| | - Yung-Mei Chao
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan
| | - Chun-Ying Hung
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan
| | - Julie Y H Chan
- Institute for Translational Research in Biomedicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 83301, Taiwan.
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19
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Affiliation(s)
- Jorge Dotto
- Yale New Haven Hospital, Yale University School of Medicine, Department Of Pathology, New Haven, Connecticut 06520-8023, USA
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20
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Cha SA, Park BM, Jung YJ, Kim SM, Kang KP, Kim W, Kim SH. Regional heterogeneity of expression of renal NPRs, TonEBP, and AQP-2 mRNAs in rats with acute kidney injury. Peptides 2015; 69:33-9. [PMID: 25858778 DOI: 10.1016/j.peptides.2015.03.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 03/21/2015] [Accepted: 03/30/2015] [Indexed: 12/13/2022]
Abstract
To understand the pathophysiology of ischemia/reperfusion (I/R) - induced acute kidney injury (AKI), the present study defined changes in renal function, plasma renotropic hormones and its receptors in the kidney 2, 5, or 7 days after 45 min-renal ischemia in rats. Blood urea nitrogen, plasma creatinine, and osmolarity increased 2 days after I/R injury and tended to return to control level 7 days after I/R injury. Decreased renal function tended to return to control level 5 days after I/R injury. However, plasma concentrations of atrial natriuretic peptide and renin did not change. In control kidney, natriuretic peptide receptor (NPR)-A, -B and -C mRNAs were highly expressed in medulla (ME), inner cortex (IC), and outer cortex (OC), respectively, and tonicity-responsive enhancer binding protein (TonEBP), auqaporin-2 (AQP-2) and eNOS mRNAs were highly expressed in ME. NPR-A and -B mRNA expressions were markedly decreased 2 days after I/R injury. On 5 days after I/R injury, NPR-A mRNA expression increased in OC and recovered to control level in IC but not in ME. NPR-B mRNA expression was increased in OC, and recovered to control level in IC and ME. NPR-C mRNA expression was markedly decreased in OC 2 and 5 days after I/R injury. TonEBP, APQ-2 and eNOS mRNA expressions were markedly decreased 2 days after I/R injury and did not recover in ME 7 days after I/R injury. Therefore, we suggest that there is a regional heterogeneity of regulation of renal NPRs, TonEBP, and APQ-2 mRNA in AKI.
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Affiliation(s)
- Seung Ah Cha
- Department of Physiology, Chonbuk National University Medical School, Jeonju, Republic of Korea
| | - Byung Mun Park
- Department of Physiology, Chonbuk National University Medical School, Jeonju, Republic of Korea
| | - Yu Jin Jung
- Internal Medicine, Chonbuk National University Medical School, Jeonju, Republic of Korea
| | - Soo Mi Kim
- Department of Physiology, Chonbuk National University Medical School, Jeonju, Republic of Korea
| | - Kyung Pyo Kang
- Internal Medicine, Chonbuk National University Medical School, Jeonju, Republic of Korea
| | - Won Kim
- Internal Medicine, Chonbuk National University Medical School, Jeonju, Republic of Korea
| | - Suhn Hee Kim
- Department of Physiology, Chonbuk National University Medical School, Jeonju, Republic of Korea.
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Abstract
In an experimental study, the scars of chronic pyelonephritis have been shown to be caused by infected intrarenal reflux. Intrarenal reflux occurs in the presence of vesicoureteric reflux and a renal papilla having special morphological characteristics predisposing to this phenomenon. Such papillae occur predominantly in the polar regions of the kidney where large pyelonephritic scars are most commonly seen. The clinical implications of this pathogenic mechanism are discussed.
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Deshmukh S, Kambadakone A, Sahani DV, Eisner BH. Hounsfield density of renal papillae in stone formers: analysis based on stone composition. J Urol 2014; 193:1560-3. [PMID: 25444988 DOI: 10.1016/j.juro.2014.10.089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2014] [Indexed: 11/19/2022]
Abstract
PURPOSE We examined renal papillary Hounsfield density in stone formers with all common stone subtypes to further understand the pathophysiology of stone formation. MATERIALS AND METHODS Using computerized tomography we measured the Hounsfield density of a 0.2 cm(2) renal papillary area in patients with a single renal calyceal stone. Results were compared with those in patients without a nephrolithiasis history who served as controls. Stone composition was determined by stone passage or extraction during endoscopic procedures using infrared spectroscopy and polarized microscopy. We measured the Hounsfield density of the stone bearing calyx and of a single calyx from the upper, middle and lower poles of each kidney. RESULTS Mean ± SD renal papillary Hounsfield density in controls was 36.2 ± 4.0 HU. In patients with stones Hounsfield density was significantly greater than in controls in stone bearing calyces, nonstone bearing calyces in the affected kidney and calyces in the contralateral nonstone bearing kidney for all stone composition subtypes (range 48.4 to 61.3 HU, each p <0.001). CONCLUSIONS Patients with kidney stones regardless of composition showed the unique radiographic characteristic of increased renal papillary Hounsfield density. This was true for all calyces and for each kidney in all stone formers with a single renal calyceal stone. This radiographic evidence supports the role of renal papillary deposits or plaques in the pathophysiology of stone formation.
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Affiliation(s)
- Sameer Deshmukh
- Departments of Radiology and Urology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Avinash Kambadakone
- Departments of Radiology and Urology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Dushyant V Sahani
- Departments of Radiology and Urology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts
| | - Brian H Eisner
- Departments of Radiology and Urology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts.
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Velroyen A, Bech M, Zanette I, Schwarz J, Rack A, Tympner C, Herrler T, Staab-Weijnitz C, Braunagel M, Reiser M, Bamberg F, Pfeiffer F, Notohamiprodjo M. X-ray phase-contrast tomography of renal ischemia-reperfusion damage. PLoS One 2014; 9:e109562. [PMID: 25299243 PMCID: PMC4192129 DOI: 10.1371/journal.pone.0109562] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 09/02/2014] [Indexed: 01/28/2023] Open
Abstract
Purpose The aim of the study was to investigate microstructural changes occurring in unilateral renal ischemia-reperfusion injury in a murine animal model using synchrotron radiation. Material and Methods The effects of renal ischemia-reperfusion were investigated in a murine animal model of unilateral ischemia. Kidney samples were harvested on day 18. Grating-Based Phase-Contrast Imaging (GB-PCI) of the paraffin-embedded kidney samples was performed at a Synchrotron Radiation Facility (beam energy of 19 keV). To obtain phase information, a two-grating Talbot interferometer was used applying the phase stepping technique. The imaging system provided an effective pixel size of 7.5 µm. The resulting attenuation and differential phase projections were tomographically reconstructed using filtered back-projection. Semi-automated segmentation and volumetry and correlation to histopathology were performed. Results GB-PCI provided good discrimination of the cortex, outer and inner medulla in non-ischemic control kidneys. Post-ischemic kidneys showed a reduced compartmental differentiation, particularly of the outer stripe of the outer medulla, which could not be differentiated from the inner stripe. Compared to the contralateral kidney, after ischemia a volume loss was detected, while the inner medulla mainly retained its volume (ratio 0.94). Post-ischemic kidneys exhibited severe tissue damage as evidenced by tubular atrophy and dilatation, moderate inflammatory infiltration, loss of brush borders and tubular protein cylinders. Conclusion In conclusion GB-PCI with synchrotron radiation allows for non-destructive microstructural assessment of parenchymal kidney disease and vessel architecture. If translation to lab-based approaches generates sufficient density resolution, and with a time-optimized image analysis protocol, GB-PCI may ultimately serve as a non-invasive, non-enhanced alternative for imaging of pathological changes of the kidney.
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Affiliation(s)
- Astrid Velroyen
- Chair of Biomedical Physics, Department of Physics (E17), Munich, Bavaria, Germany
| | - Martin Bech
- Chair of Biomedical Physics, Department of Physics (E17), Munich, Bavaria, Germany
- Medical Radiation Physics, Lund University, Lund, Sweden
| | - Irene Zanette
- Chair of Biomedical Physics, Department of Physics (E17), Munich, Bavaria, Germany
| | - Jolanda Schwarz
- Chair of Biomedical Physics, Department of Physics (E17), Munich, Bavaria, Germany
| | - Alexander Rack
- European Synchrotron Radiation Facility, Grenoble, France
| | - Christiane Tympner
- Institute of Pathology, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Tanja Herrler
- Department of General, Trauma, Hand, and Plastic Surgery, Ludwig-Maximilians-University Hospital Munich, Munich, Germany
| | - Claudia Staab-Weijnitz
- Institute for Clinical Radiology, University Hospitals Munich, Munich, Germany
- Comprehensive Pneumology Center, University Hospital, Ludwig-Maximilians-University and Helmholtz Zentrum Munich, Munich, Germany
| | - Margarita Braunagel
- Institute for Clinical Radiology, University Hospitals Munich, Munich, Germany
| | - Maximilian Reiser
- Institute for Clinical Radiology, University Hospitals Munich, Munich, Germany
| | - Fabian Bamberg
- Institute for Clinical Radiology, University Hospitals Munich, Munich, Germany
- Department of Radiology, University Hospital Tuebingen, Tuebingen, Germany
| | - Franz Pfeiffer
- Chair of Biomedical Physics, Department of Physics (E17), Munich, Bavaria, Germany
| | - Mike Notohamiprodjo
- Institute for Clinical Radiology, University Hospitals Munich, Munich, Germany
- Department of Radiology, University Hospital Tuebingen, Tuebingen, Germany
- * E-mail:
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24
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Cakiroglu B, Eyyupoglu SE, Tas T, Esen T, Acar O, Aksoy SH. Renal papillary attenuation differences between primary and recurrent idiopathic calcium stone disease patients. MINERVA UROL NEFROL 2014; 66:107-112. [PMID: 24988201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
AIM The aim of this paper was to investigate whether renal papillae of patients with nephrolithiasis are more radiodense than that of control patients and to evaluate the predictability of urolithiasis using papillary density differences between stone and non-stone formers. METHODS Renal papillary Hounsfield Unit (HU) measurements were conducted at the level of upper pole, middle region and lower pole of both kidneys in a total of 126 primary (group 1), 133 recurrent (group 2) stone disease patients and 108 controls (group 3). RESULT Mean patient age did not differ significantly between groups (P>0.05). Mean stone diameters (±SD) were 5.0±3.1 mm (3-9 mm) and 6.1±3.3 mm (3-15 mm) for primary and recurrent groups, respectively and group distributions and variances were similar (P>0.05). Mean papillary attenuation values (±SD) were 27.26±9.30 (4.00-56.00) in group 1, 30.42±9.88 (12.00-64.00) in group 2 and 25.83±2.72 (20.30-32.56) in the control group. The difference between the mean papillary attenuation value of the primary stone disease group and the control group was statistically insignificant (P=0.104). When the control group and the recurrent stone group was compared without variances, in terms of the mean renal papillary attenuation value, a statistical significance was achieved (P=0.000). CONCLUSION With increasing renal papillary HU values, the risk of recurrent calcium stone disease is increased.
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Affiliation(s)
- B Cakiroglu
- Hisar Intercontinental Hospital Deparment of Urology, Umraniye Istanbul, Turkey -
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25
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Moon CH, Furlan A, Kim JH, Zhao T, Shapiro R, Bae KT. Quantitative sodium MR imaging of native versus transplanted kidneys using a dual-tuned proton/sodium (1H/ 23Na) coil: initial experience. Eur Radiol 2014; 24:1320-6. [PMID: 24668008 DOI: 10.1007/s00330-014-3138-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Revised: 01/26/2014] [Accepted: 02/18/2014] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To compare sodium ((23)Na) characteristics between native and transplanted kidneys using dual-tuned proton ((1)H)/sodium MRI. METHODS Six healthy volunteers and six renal transplant patients (3 normal function, 3 acute allograft rejection) were included. Proton/sodium MRI was obtained at 3 T using a dual-tuned coil. Signal to noise ratio (SNR), sodium concentration ([(23)Na]) and cortico-medullary sodium gradient (CMSG) were measured. Reproducibility of [(23)Na] measurement was also tested. SNR, [(23)Na] and CMSG of the native and transplanted kidneys were compared. RESULTS Proton and sodium images of kidneys were successfully acquired. SNR and [(23)Na] measurements of the native kidneys were reproducible at two different sessions. [(23)Na] and CMSG of the transplanted kidneys was significantly lower than those of the native kidneys: 153.5 ± 11.9 vs. 192.9 ± 9.6 mM (P = 0.002) and 8.9 ± 1.5 vs. 10.5 ± 0.9 mM/mm (P = 0.041), respectively. [(23)Na] and CMSG of the transplanted kidneys with normal function vs. acute rejection were not statistically different. CONCLUSIONS Sodium quantification of kidneys was reliably performed using proton/sodium MRI. [(23)Na] and CMSG of the transplanted kidneys were lower than those of the native kidneys, but without a statistically significant difference between patients with or without renal allograft rejection. KEY POINTS Dual-tuned proton/sodium RF coil enables co-registered proton and sodium MRI. Structural and sodium biochemical property can be acquired by dual-tuned proton/sodium MRI. Sodium and sodium gradient of kidneys can be measured by dual-tuned MRI. Sodium concentration was lower in transplanted kidneys than in native kidneys. Sodium gradient of transplanted kidneys was lower than for native kidneys.
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Affiliation(s)
- Chan Hong Moon
- Department of Radiology, University of Pittsburgh, 200 Lothrop Street, Presby South tower Suite 3950, Pittsburgh, PA, 15213, USA
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Zheng S, Liu J, Han Q, Huang S, Su W, Fu J, Jia X, Du S, Zhou Y, Zhang X, Guan Y. Metformin induces renal medullary interstitial cell apoptosis in type 2 diabetic mice. J Diabetes 2014; 6:132-46. [PMID: 24405721 DOI: 10.1111/1753-0407.12105] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 10/20/2013] [Accepted: 10/28/2013] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVE Metformin is a first-line antidiabetic drug for type 2 diabetes (T2D) with a relatively good safety profile. Metformin activates AMP-activated protein kinase (AMPK), which is crucial in maintaining renal medullary function, with inappropriate AMPK activation facilitating renal medullary interstitial cells (RMICs) apoptosis under hypertonic challenge. The present study was to determine the effects of metformin on RMIC survival in both normal and T2D mice. METHODS Mice (C57BL/6, db/m, and db/db) were treated with 450 mg/kg metformin for 7 days and subjected to 24-h water restriction (=dehydration) before being killed. Cell apoptosis in the renal medulla was determined by the terminal deoxyribonucleotidyl transferase-mediated dUTP-digoxigenin nick end-labeling (TUNEL) assay. Cultured RMIC were treated with 10 mmol/L metformin in the presence or absence of hypertonic stress. Cell viability was determined and the underlying mechanisms were investigated. RESULTS Metformin induced significant apoptosis of RMIC in dehydrated normal mice and both hydrated and dehydrated T2D mice. Hypertonicity increased ATP production and inhibited AMPK phosphorylation in RMIC, which was attenuated by metformin. Metformin augmented hypertonicity-induced apoptosis of RMIC, suppressed the nuclear factor-κB/cyclo-oxygenase-2 pathway, reduced reactive oxygen species production and inhibited transcriptional activation of tonicity-responsive enhancer binding protein (TonEBP) and its downstream osmoprotective gene expression. CONCLUSIONS Metformin treatment is associated with increased RMIC apoptosis in both normally hydrated and dehydrated T2D mice. The results confirm AMPK as a critical factor involved in the maintenance of RMIC viability in T2D and raise safety concerns for metformin and other AMPK-activating antidiabetic drugs in dehydrated diabetic patients.
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Affiliation(s)
- Senfeng Zheng
- Department of Physiology and Pathophysiology, Key Laboratory of Cardiovascular Science of the Ministry of Education, Peking University Health Science Center, Beijing, China
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27
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Velyka AI, Pshak VP, Lopushins'ka IV. [Activity of antioxidant enzymes of the rat kidneys under mercury dichloride effect]. Ukr Biochem J 2014; 86:124-130. [PMID: 24834726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023] Open
Abstract
Salts of heavy metals are excreted by the kidneys and, as pro-oxidants, stimulate the processes of free radical oxidation. Mercury ions are accumulated in the kidneys. So the study of the features of antioxidant enzymes adaptive response of different kidney layers in response to mercury dichloride is important. Catalase and glytathionperoxidase activity within rat kidneys 72 hours after mercury dichloride intoxication in the ratio of 5 ml per 1 kg of the animal weight was studied. It was important to reveal the influence of the mercury salts on rat kidney antioxidative system. Decreasing glytathionperoxidase activity in cortical and cerebral substances and renal papillae were accompanied by increased contents of oxidative modified proteins and lipids and morphological changes in renal tissue under salt and water loading after mercury dichloride poisoning. The results obtained evidence for the inhibition of antioxidative protection of enzymes in rat kidneys under the mercury dichloride effect.
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Gao J, Min R, Hamilton J, Weitzel W, Chen J, Juluru K, Rubin JM. Corticomedullary strain ratio: a quantitative marker for assessment of renal allograft cortical fibrosis. J Ultrasound Med 2013; 32:1769-1775. [PMID: 24065258 DOI: 10.7863/ultra.32.10.1769] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
OBJECTIVES To quantitatively assess the correlation between the corticomedullary strain ratio and cortical fibrosis in renal transplants. METHODS Using quasistatic ultrasound elasticity imaging, we prospectively assessed the corticomedullary strain ratio in renal allografts of 33 patients who underwent renal transplant sonography and biopsy. Based on Banff score criteria for renal cortical fibrosis, 33 allografts were divided into 2 groups: group 1 (n = 19), with mild (<25%) fibrosis; and group 2 (n = 14), with moderate (>26%) fibrosis. We used 2-dimensional speckle-tracking software to perform offline analysis of cortical and medullary strain induced by external compression by the ultrasound transducer. We then calculated the corticomedullary strain ratio (cortical normalized strain/medullary normalized strain; normalized strain = developed strain/applied strain [deformation from the abdominal wall to the pelvic muscles]). An unpaired 2-tailed t test was used to determine differences in normalized strain and the strain ratio between the groups. Receiver operating characteristic curve analysis was performed to determine the best strain ratio cutoff value for identifying moderate fibrosis. RESULTS Normalized strain differed between the cortex and medulla (mean ± SD: group 1, 4.58 ± 2.02 versus 2.58 ± 1.38; P = .002; group 2, 1.71 ± 0.42 versus 2.60 ± 0.87; P = .0011). The strain ratio in group 1 was higher than in group 2 (2.06 ± 1.33 versus 0.70 ± 0.20; P = .0007). The area under the receiver operating characteristic curve was 0.964. The sensitivity and specificity of a strain ratio cutoff value of 0.975 for determining moderate fibrosis were 92.9% and 94.7%, respectively. CONCLUSIONS Strain values vary in different compartments of the kidney. The corticomedullary strain ratio on ultrasound elasticity imaging decreases with increasing renal cortical fibrosis, which makes it potentially useful as a noninvasive quantitative marker for monitoring the progression of fibrosis in renal transplants.
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Affiliation(s)
- Jing Gao
- Department of Radiology, New York-Presbyterian Hospital, Weill Cornell Medical College, 525 E 68th St, Suite 8A-37, New York, NY 10065 USA.
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29
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Kaimori JY, Iwai S, Hatanaka M, Teratani T, Obi Y, Tsuda H, Isaka Y, Yokawa T, Kuroda K, Ichimaru N, Okumi M, Yazawa K, Rakugi H, Nonomura N, Takahara S, Kobayashi E. Non-invasive magnetic resonance imaging in rats for prediction of the fate of grafted kidneys from cardiac death donors. PLoS One 2013; 8:e63573. [PMID: 23667641 PMCID: PMC3647057 DOI: 10.1371/journal.pone.0063573] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 04/03/2013] [Indexed: 12/13/2022] Open
Abstract
The main objective of this study was to assess cardiac death (CD) kidney grafts before transplantation to determine whether blood oxygen level-dependent (BOLD) and diffusion MRI techniques can predict damage to these grafts after transplantation. We assessed CD kidney tissue by BOLD and diffusion MRI. We also examined pathological and gene expression changes in CD kidney grafts before and after transplantation. Although there was significantly more red cell congestion (RCC) in the inner stripe of the outer medulla (IS) in both 1 h after cardiac death (CD1h) and CD2h kidneys destined for grafts before transplantation compared with CD0h (p<0.05), CD2h, but not CD1h, kidney grafts had significantly different RCC in the IS 2 days after transplantation (p<0.05). Consistent with these pathological findings, tissue plasminogen activator (tPA) gene expression was increased only in the cortex and medulla of CD2h kidney grafts after transplantation. BOLD MRI successfully and non-invasively imaged and quantified RCC in the IS in both CD1h and CD2h kidney grafts (p<0.05). Diffusion MRI also non-invasively assessed increased the apparent diffusion coefficient in the IS and decreased it in the outer stripe (OS) of CD2h grafts, in concordance with interstitial edema in the IS and tubule cellular edema in the OS. These two types of edema in the outer medulla could explain the prolonged RCC in the IS only of CD2h kidney grafts, creating part of a vicious cycle inhibiting red cells coming out of capillary vessels in the IS. Perfusion with University of Wisconsin solution before MRI measurements did not diminish the difference in tissue damage between CD1h and CD2h kidney grafts. BOLD and diffusion MRI, which are readily available non-invasive tools for evaluating CD kidney grafts tissue damage, can predict prolonged organ damage, and therefore the outcome, of transplanted CD kidney grafts.
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Affiliation(s)
- Jun-Ya Kaimori
- Department of Advanced Technology for Transplantation, Osaka University Graduate School of Medicine, Osaka, Japan
- Department of Geriatrics and Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Satomi Iwai
- Laboratory of Small Animal Surgery I, School of Veterinary Medicine, Kitasato University, Aomori, Japan
| | - Masaki Hatanaka
- Department of Geriatrics and Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takumi Teratani
- Center for Development of Advanced Medical Technology, Jichi Medical University, Tochigi, Japan
| | - Yoshitsugu Obi
- Department of Geriatrics and Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hidetoshi Tsuda
- Department of Advanced Technology for Transplantation, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yoshitaka Isaka
- Department of Geriatrics and Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan
- * E-mail:
| | | | - Kagayaki Kuroda
- Tokai University School of Information Science and Technology Department of Human and Information Science, Kanagawa, Japan
| | - Naotsugu Ichimaru
- Department of Advanced Technology for Transplantation, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masayoshi Okumi
- Department of Specific Organ Regulation(Urology), Osaka University Graduate School of Medicine, Osaka, Japan
| | - Koji Yazawa
- Department of Specific Organ Regulation(Urology), Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiromi Rakugi
- Department of Geriatrics and Nephrology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Norio Nonomura
- Department of Specific Organ Regulation(Urology), Osaka University Graduate School of Medicine, Osaka, Japan
| | - Shiro Takahara
- Department of Advanced Technology for Transplantation, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Eiji Kobayashi
- Center for Development of Advanced Medical Technology, Jichi Medical University, Tochigi, Japan
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30
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Thelwall PE, Taylor R, Marshall SM. Non-invasive investigation of kidney disease in type 1 diabetes by magnetic resonance imaging. Diabetologia 2011; 54:2421-9. [PMID: 21533898 DOI: 10.1007/s00125-011-2163-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2011] [Accepted: 03/23/2011] [Indexed: 12/15/2022]
Abstract
AIMS/HYPOTHESIS Pathophysiological abnormalities in early diabetic nephropathy are poorly understood. We employed MRI to characterise renal perfusion, tissue oxygenation and kidney size in non-diabetic volunteers and type 1 diabetic patients without and with early renal disease. METHODS We studied ten control participants (C; age 40.0 [range 31-54] years), nine longstanding normotensive type 1 diabetic patients (T1Normo; age 40.1 [31-50] years, estimated glomerular filtration rate [eGFR] 83.4 ± 10.6 ml min(-1) 1.73 m(-2)) and eight microalbuminuric type 1 diabetic patients (T1Micro; age 42.4 [33-52] years, eGFR 71.6 ± 13.7 ml min(-1) 1.73 m(-2)). Six microalbuminuric patients were restudied after 4 weeks without renin-angiotensin-aldosterone system inhibitors. Phase contrast angiography and kidney blood oxygen level dependent (BOLD) (R(2)(*)) MRI were performed, before and during water diuresis. Contrast-enhanced MRI was performed at baseline urine flow rate. Renal artery flow, renal vascular resistance (RVR), cortical and medullary volumes, and R(2)(*) were determined. RESULTS Renal cortical and medullary volumes were similar in all groups (cortex: C 108 ± 16, T1Normo 112 ± 21, T1Micro 111 ± 10 cm(3)/1.73 m(2); medulla: C 35 ± 14, T1Normo 29 ± 10, 33 ± 6 cm(3)/1.73 m(2)). RVR increased from control to normoalbuminuric to microalbuminuric type 1 diabetic patients (C 0.061 ± 0.018, T1Normo 0.077 ± 0.014, T1Micro 0.093 ± 0.024 mmHg ml(-1) min(-1) 1.73 m(-2), ANOVA p = 0.012). RVR correlated inversely with eGFR in normoalbuminuric, but not in microalbuminuric diabetic patients. Renal artery flow was lower in the whole diabetes cohort (control 740 ± 205 vs diabetes 591 ± 128 ml min(-1) 1.73 m(-2), p = 0.035). CONCLUSIONS/INTERPRETATION Cortical and medullary volumes remain normal in early diabetic nephropathy. Decreased renal flow in longstanding normoalbuminuric type 1 diabetic patients may reflect intrarenal vascular stiffening, whereas in the microalbuminuric patients it may also reflect increased intraglomerular pressure.
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Affiliation(s)
- P E Thelwall
- Newcastle Magnetic Resonance Centre, Campus for Ageing and Vitality, Newcastle University, Newcastle upon Tyne NE4 5PL, UK.
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31
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Abstract
The renal pressure-natriuresis mechanism is the dominant controller of body fluid balance and long-term arterial pressure. In recent years, it has become clear that the balance of reactive oxygen and nitrogen species within the renal medullary region is a key determinant of the set point of the renal pressure-natriuresis curve. The development of renal medullary oxidative stress causes dysfunction of the pressure-natriuresis mechanism and contributes to the development of hypertension in numerous disease models. The purpose of this review is to point out the known mechanisms within the renal medulla through which reactive oxygen and nitrogen species modulate the pressure-natriuresis response and to update the reader on recent advances in this field.
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Affiliation(s)
- Paul M O'Connor
- Department of Physiology, Medical College of Wisconsin, Milwaukee, WI 53202, USA.
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32
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Oostendorp M, de Vries EE, Slenter JMGM, Peutz-Kootstra CJ, Snoeijs MG, Post MJ, van Heurn LWE, Backes WH. MRI of renal oxygenation and function after normothermic ischemia-reperfusion injury. NMR Biomed 2011; 24:194-200. [PMID: 20954164 DOI: 10.1002/nbm.1572] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 04/12/2010] [Accepted: 04/29/2010] [Indexed: 05/30/2023]
Abstract
The in vivo assessment of renal damage after ischemia-reperfusion injury, such as in sepsis, hypovolemic shock or after transplantation, is a major challenge. This injury often results in temporary or permanent nonfunction. In order to improve the clinical outcome of the kidneys, novel therapies are currently being developed that limit renal ischemia-reperfusion injury. However, to fully address their therapeutic potential, noninvasive imaging methods are required which allow the in vivo visualization of different renal compartments and the evaluation of kidney function. In this study, MRI was applied to study kidney oxygenation and function in a murine model of renal ischemia-reperfusion injury at 7 T. During ischemia, there was a strongly decreased oxygenation, as measured using blood oxygen level-dependent MRI, compared with the contralateral control, which persisted after reperfusion. Moreover, it was possible to visualize differences in oxygenation between the different functional regions of the injured kidney. Dynamic contrast-enhanced MRI revealed a significantly reduced renal function, comprising perfusion and filtration, at 24 h after reperfusion. In conclusion, MRI is suitable for the noninvasive evaluation of renal oxygenation and function. Blood oxygen level-dependent or dynamic contrast-enhanced MRI may allow the early detection of renal pathology in patients with ischemia-reperfusion injury, such as in sepsis, hypovolemic shock or after transplantation, and consequently may lead to an earlier intervention or change of therapy to minimize kidney damage.
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Affiliation(s)
- Marlies Oostendorp
- Department of Radiology, Maastricht University Medical Center (MUMC+), Maastricht, the Netherlands
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Kulikov AV, Spirin SV, Blauman SI. [Clinicopathologic characteristics of HELLP-syndrome]. Anesteziol Reanimatol 2010:87-91. [PMID: 21400802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
HELLP-syndrome is one of the most severe variants of liver failure in pregnancy. The incidence among pregnant patients is 0.5-0.9%, and in presence of severe preeclampsia and eclampsy the incidence is 10-20%. Pathogenesis of HELLP-syndrome has common features with pathogenesis of preeclampsia, DIC-syndrome and fatty hepatosis of pregnant, this is confirmed by pathomorphological changes of liver in women with HELLP-syndrome. Efficacy of conservative therapy (corticosteroids, magnesium sulphate, hypotensive therapy, hepatoprotectors) and disintoxication methods (plasmapheresis, MARS-therapy) is not evident. Difficulties of timely diagnosing, symptomatic nature of treatment, severity of complications lead to high rates of maternal (up to 25%) and perinatal (up to 34%) mortality. The only radical and efficient method of HELLP-syndrome treatment available is a timely delivery. That's why the revelation and consideration of the slightest clinical and laboratorial manifestations is very important in pregnancy.
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Schulman IH, Zhou MS, Treuer AV, Chadipiralla K, Hare JM, Raij L. Altered renal expression of angiotensin II receptors, renin receptor, and ACE-2 precede the development of renal fibrosis in aging rats. Am J Nephrol 2010; 32:249-261. [PMID: 20689271 DOI: 10.1159/000318607] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2010] [Accepted: 07/01/2010] [Indexed: 11/19/2022]
Abstract
BACKGROUND The susceptibility to fibrosis and progression of renal disease is mitigated by inhibition of the renin-angiotensin system (RAS). We hypothesized that activation of the intrarenal RAS predisposes to renal fibrosis in aging. METHODS Intrarenal expression of angiotensin II type 1 (AT(1)R), type 2 (AT(2)R), and (pro)renin receptors, ACE and ACE-2, as well as pro- and antioxidant enzymes were measured in 3-month-old (young), 14-month-old (middle-aged), and 24-month-old (old) male Sprague-Dawley rats. RESULTS Old rats manifested glomerulosclerosis and severe tubulointerstitial fibrosis with increased fibronectin and TGF-β expression (7-fold). AT(1)R /AT(2)R ratios were increased in middle-aged (cortical 1.6-fold, medullary 5-fold) and old rats (cortical 2-fold, medullary 4-fold). Similarly, (pro)renin receptor expression was increased in middle-aged (cortical 2-fold, medullary 3-fold) and old (cortical 5-fold, medullary 3-fold) rats. Cortical ACE was increased (+35%) in old rats, whereas ACE-2 was decreased (-50%) in middle-aged and old rats. NADPH oxidase activity was increased (2-fold), whereas antioxidant capacity and expression of the mitochondrial enzyme manganese superoxide dismutase (cortical -40%, medullary -53%) and medullary endothelial nitric oxide synthase (-48%) were decreased in old rats. CONCLUSION Age-related intrarenal activation of the RAS preceded the development of severe renal fibrosis, suggesting that it contributes to the increased susceptibility to renal injury observed in the elderly.
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Asfandiiarov FR, Kafarov ES. [Change of blood volume in the kidney cortical and medulla vessels in aging process]. Adv Gerontol 2010; 23:90-92. [PMID: 20586257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We studied the volumes of arterial and venous vessels (cortical and medulla) of a kidney, excepting microcirculation system. The research covered 76 corrosion preparations of kidneys of people, aged from 21 till 85 years, died from diseases which could not affect on morfofunctional condition of kidneys and their vascular system. We have found out that morphological changes in kidneys at aging are characterised, basically, by progressing nephrosclerosis. The major factor provoking development of sclerous changes in a kidney is the age changes of kidney arterial vessels. It is proved that structural changes in venous and arterial vessels in involution are characterised by gradual decrease of volume of cortical substances vessels, where the considerable part of blood proceeds.
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Goldfarb M, Rosenberger C, Ahuva S, Rosen S, Heyman SN. A Role for Erythropoietin in the Attenuation of Radiocontrast-Induced Acute Renal Failure in Rats. Ren Fail 2009; 28:345-50. [PMID: 16771251 DOI: 10.1080/08860220600591420] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
Abstract
BACKGROUND Radiocontrast-induced nephropathy (CIN) remains an important iatrogenic cause of acute renal failure in high-risk patients, despite the development of safer contrast media, the improvement of hydration protocols, and the introduction of additional preventive strategies. Erythropoietin (EPO) pretreatment may confer protection against acute renal failure through the induction of stress response genes. METHODS The effect of EPO has been evaluated in a rat model of CIN, induced by iothalamate, following the inhibition of nitric oxide- and prostaglandin-synthesis with indomethacin and N(omega) nitro-L-arginine methyl ester (L-NAME). Twenty-two male Sprague-Dawley rats were subjected to saline (CTR) or EPO injections (3000 U/kg and 600 U/kg, 24 and 2 h before the induction of CIN, respectively). RESULTS The decline in creatinine clearance in CTR animals from 0.38 +/- 0.03 to 0.28 +/- 0.03 mL/min/100 g (p < 0.005), was prevented by EPO pretreatment (from 0.34 +/- 0.02 to 0.32 +/- 0.03 mL/min/100 g, NS). The extent of medullary thick ascending limb- and S3-tubular damage in the outer medulla, however, was comparable in the two experimental groups. CONCLUSIONS EPO pretreatment prevents renal dysfunction in a rat model of CIN. Further experimental and clinical studies are required to confirm these preliminary conclusions regarding a potential protective potency of EPO against CIN.
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Zotta E, Ochoa F, Tironi Farinati C, Damiano A, Silberstein C, Levy Yeyati N, Ibarra C. UT-A expression in pars recta from a rat model of chronic renal failure. J Nephrol 2008; 21:947-58. [PMID: 19034881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
BACKGROUND Urea transport depends on the diffusion through cell membrane and the facilitated urea transport. Two groups of urea transporters (UT-A and UT-B) have been identified in mammals, and both are involved in intrarenal recycling of urea. The aim of our study was to examine the renal urea handling in rats with chronic renal failure (CRF). METHODS CRF rats were induced by 5/6 nephrectomy followed by a high-protein (HP) diet to increase the progressive loss of renal function for 5 months. Functional studies on water and urea handling were performed. RT-PCR, immunoblotting and immunohistochemistry were used to identify UT-A proteins in remnant kidney. RESULTS A significant decrease in creatinine clearance consistent with development of CRF was observed. The remnant kidneys were hypertrophied, and total renal mass was increased. Urine production increased markedly, whereas urine osmolality and solute-free water reabsorption decreased significantly. Fractional urea excretion was increased reaching values of 105% -/+ 8%. UT-A protein was localized in pars recta by immunohistochemical studies, and it was identified as UT-A2 in outer medulla from remnant kidneys by RT-PCR and immunoblotting. CONCLUSION In uremic rats, an urea transporter type UT-A2 was expressed in the pars recta, suggesting a possible relation with the fractional urea excretion increase. This expression may be a consequence of an adaptive mechanism in the handling of urea during development of CRF. Further studies will be necessary to elucidate the contribution of this mechanism to renal damage observed in the progression of CRF.
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Affiliation(s)
- Elsa Zotta
- Physiopathogeny Laboratory, Department of Physiology, Faculty of Medicine, University of Buenos Aires, Buenos Aires - Argentina.
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Jacob V, Harbaugh C, Dietz JR, Fenton RA, Kim SM, Castrop H, Schnermann J, Knepper MA, Chou CL, Anderson SA. Magnetic resonance imaging of urea transporter knockout mice shows renal pelvic abnormalities. Kidney Int 2008; 74:1202-8. [PMID: 18854850 PMCID: PMC2614379 DOI: 10.1038/ki.2008.392] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Many transgenic and knockout mice with increased urine flow have structural abnormalities of the renal pelvis and inner medulla. Here, we used high resolution contrast enhanced T1-weighted magnetic resonance imaging of mice whose urea transporters UT-A1 and UT-A3 were deleted (UT-A1/3(-/-) mice) as a model for the in vivo study of such abnormalities. Three distinct variations in the appearance of the renal pelvis were found. These included normal kidneys with no accumulation of contrast agent in the renal pelvis; infrequent frank right-sided unilateral hydronephrosis with marked atrophy of the renal medulla; and a renal pelvic reflux pattern characterized by the presence of contrast agent in the renal pelvis surrounding the renal inner medulla but no substantial atrophy of the medulla. This last pattern was found in most of the advanced age UT-A1/3(-/-) mice and in aquaporin-1 knockout mice. The UT-A1/3(-/-) mice also had increased mean arterial blood pressures. Feeding the mice a low protein diet did not prevent development of their renal pelvic abnormalities. Our studies show that real time imaging of renal pelvic structure in genetically manipulated mice provides a tool for the non-destructive, temporal evaluation of kidney structure.
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Affiliation(s)
- Vinitha Jacob
- Laboratory of Kidney and Electrolyte Metabolism, National Heart Lung and Blood Institutes, National Institutes of Health, Bethesda, MD 20892, USA
| | - Calista Harbaugh
- Laboratory of Kidney and Electrolyte Metabolism, National Heart Lung and Blood Institutes, National Institutes of Health, Bethesda, MD 20892, USA
| | - John R. Dietz
- Department of Physiology and Biophysics, University of South Florida, Tampa, FL 33612
| | - Robert A. Fenton
- Institute of Anatomy, University of Aarhus, The Water and Salt Research Center, Aarhus, Denmark
| | - Soo Mi Kim
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Hayo Castrop
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Jurgen Schnermann
- National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA
| | - Mark A. Knepper
- Laboratory of Kidney and Electrolyte Metabolism, National Heart Lung and Blood Institutes, National Institutes of Health, Bethesda, MD 20892, USA
| | - Chung-Lin Chou
- Laboratory of Kidney and Electrolyte Metabolism, National Heart Lung and Blood Institutes, National Institutes of Health, Bethesda, MD 20892, USA
| | - Stasia A. Anderson
- Animal MRI/Imaging Core, National Heart Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA
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Abstract
BACKGROUND/AIMS Inflammation plays a key role in ischemic acute renal failure (ARF). The present study investigated the infiltration of macrophages in the early phase of ischemic ARF in mice. METHODS Ischemic ARF was induced by renal clamping for 22 min, while the control mice underwent sham surgery (no clamping). The serum creatinine and blood urea nitrogen (BUN) levels were measured in the control and post-ischemia mice. Immunofluorescence staining was used to measure the number of CD 11b-positive cells in the kidney tissue sections to determine the amount of post-ischemic macrophage infiltration. Lipo-Cl2MBP (clodronate) for macrophages depletion was injected via a tail vein 5 d before ischemia induction and again 2 d before ischemia induction. RESULTS The study found that the post-ischemia mice had higher levels of serum creatinine and BUN at 16 and 24 h compared to the controls. Immunofluorescence staining showed there were more macrophages in the post-ischemic tissue at 2, 8, 16 and 24 h compared to the control tissue, and that most of these macrophages were located in the outer medulla. The mice treated with clodronate prior to ischemia induction were found to have lower levels of serum creatinine compared to those mice that weren't treated with clodronate. CONCLUSIONS There was significant infiltration of macrophages from the early phase of ischemic ARF, and this peaked at 16-24 h. Macrophage depletion using clodronate was protective against ischemic ARF.
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Affiliation(s)
- Soo-Jeong Yu
- Department of Internal Medicine, Incheon Christian Hospital, Korea
| | - Dong-Jin Oh
- Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul, Korea
| | - Suk-Hee Yu
- Department of Internal Medicine, College of Medicine, Chung-Ang University, Seoul, Korea
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Abstract
By using intraoperative papillary biopsy material from kidneys of idiopathic calcium oxalate, intestinal bypass for obesity, brushite, cystine, and distal renal tubular acidosis stone formers during percutaneous nephrolithotomy, we have determined that idiopathic calcium oxalate stone formers appear to be the special case, although the most commonly encountered one, in which stones form external to the kidney and by processes that do not involve the epithelial compartments. It is in this one group of patients that we find not only abundant interstitial plaque, but also strong evidence that the plaque is essential to stone formation. The initial site of plaque formation is always in the papillary tip, and must be in the basement membrane of the thin loop of Henle. With time, plaque spreads throughout the papilla tip to the urothelium, which under conditions we do not understand is denuded and thereby exposes the apatite deposits to the urine. It is on this exposed apatite that a stone forms as an overgrowth, first of amorphous apatite and then layers of calcium oxalate. This process generates an attached stone fixed to the side of a papilla, allowing the ever-changing urine to dictate stone growth and composition.
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Affiliation(s)
- Andrew P Evan
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN 46202-5120, USA.
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Affiliation(s)
- Kentaro Okubo
- Department of Nephrology, Aizawa Hospital, Matsumoto.
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Mo L, Liaw L, Evan AP, Sommer AJ, Lieske JC, Wu XR. Renal calcinosis and stone formation in mice lacking osteopontin, Tamm-Horsfall protein, or both. Am J Physiol Renal Physiol 2007; 293:F1935-43. [PMID: 17898038 DOI: 10.1152/ajprenal.00383.2007] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Although often supersaturated with mineral salts such as calcium phosphate and calcium oxalate, normal urine possesses an innate ability to keep them from forming harmful crystals. This inhibitory activity has been attributed to the presence of urinary macromolecules, although controversies abound regarding their role, or lack thereof, in preventing renal mineralization. Here, we show that 10% of the mice lacking osteopontin (OPN) and 14.3% of the mice lacking Tamm-Horsfall protein (THP) spontaneously form interstitial deposits of calcium phosphate within the renal papillae, events never seen in wild-type mice. Lack of both proteins causes renal crystallization in 39.3% of the double-null mice. Urinalysis revealed elevated concentrations of urine phosphorus and brushite (calcium phosphate) supersaturation in THP-null and OPN/THP-double null mice, suggesting that impaired phosphorus handling may be linked to interstitial papillary calcinosis in THP- but not in OPN-null mice. In contrast, experimentally induced hyperoxaluria provokes widespread intratubular calcium oxalate crystallization and stone formation in OPN/THP-double null mice, while completely sparing the wild-type controls. Whole urine from OPN-, THP-, or double-null mice all possessed a dramatically reduced ability to inhibit the adhesion of calcium oxalate monohydrate crystals to renal epithelial cells. These data establish OPN and THP as powerful and functionally synergistic inhibitors of calcium phosphate and calcium oxalate crystallization in vivo and suggest that defects in either molecule may contribute to renal calcinosis and stone formation, an exceedingly common condition that afflicts up to 12% males and 5% females.
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Affiliation(s)
- Lan Mo
- Dept. of Urology, New York Univ. School of Medicine, Veterans Affairs Medical Center in Manhattan, 423 E23 St., Rm. 18064S, New York, NY 10010, USA.
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Abstract
Contrast-induced nephropathy (CIN) is a common cause of acute kidney injury in hospitalized patients. The mechanisms involved in the pathogenesis of CIN are incompletely understood. Goodman et al. have demonstrated for the first time that heme oxygenase-1, a 32-kilodalton protein with antioxidant, antiapoptotic, anti-inflammatory effects, is induced in the kidney and, importantly, provides a beneficial effect in CIN.
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Affiliation(s)
- L M Curtis
- Department of Medicine, Nephrology Research and Training Center, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
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Abstract
Studies by Butt et al. in the developing fetus provide new and timely insights into the regulation of repair and fibrosis in the injured kidney. Using a clinically relevant model, they have examined the response of the medullary collecting duct to ureteral obstruction, with some unexpected findings.
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Affiliation(s)
- T D Hewitson
- Department of Nephrology, Royal Melbourne Hospital, Melbourne, Victoria, Australia.
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Evan AP, Bledsoe S, Worcester EM, Coe FL, Lingeman JE, Bergsland KJ. Renal inter-alpha-trypsin inhibitor heavy chain 3 increases in calcium oxalate stone-forming patients. Kidney Int 2007; 72:1503-11. [PMID: 17898697 DOI: 10.1038/sj.ki.5002569] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Inter-alpha-trypsin inhibitor heavy-chain proteins bind to the protease inhibitor bikunin and to hyaluronan, stabilizes extracellular matrix in various tissues, and also inhibits calcium oxalate crystallization in vitro. In both normal and stone-forming patients, we found heavy chain 3 and hyaluronan in the interstitial matrix of the kidney. Osteopontin was found in the collecting duct, thin loop of Henle, and urothelial cells. In stone formers, heavy chain 3 was also present in collecting duct, thin loop, and interstitial cells. Heavy chain 3 and osteopontin colocalized in plaque matrix and urothelial cells. Within individual plaque spherules, heavy chain 3 was found in the matrix layer while osteopontin was located along the crystal-matrix interface. Bikunin was present only in the collecting duct apical membranes and the loop cell cytoplasm of stone formers colocalizing with osteopontin and heavy chain 3. Widespread heavy chain 3 was only present in stone formers, whereas osteopontin was similarly expressed in normal and stone-forming subjects except for its localization in plaques of the stone formers. This is consistent with studies linking inter-alpha-trypsin inhibitor components to human stone disease, although their role is still unclear. Heavy chain 3 may also play a role in stabilizing hyaluronan in the renal interstitial matrix.
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Affiliation(s)
- A P Evan
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46223, USA.
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Watanabe IC, Billis A, Guimarães MS, Alvarenga M, de Matos AC, Cardinalli IA, Filippi RZ, de Castro MG, Suzigan S. Renal medullary carcinoma: report of seven cases from Brazil. Mod Pathol 2007; 20:914-20. [PMID: 17643096 DOI: 10.1038/modpathol.3800934] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We report seven cases of renal medullary carcinoma collected from several institutions in Brazil. In spite of a relatively high incidence of sickle cell trait in Brazil, this is a rare tumor. All patients were males between the ages of 8 and 69 years (mean 22 years). From the collected information, the most frequent presenting symptoms were gross hematuria and flank or abdominal pain. The duration of symptoms ranged from 1 week to 5 months. Most of the tumors were poorly circumscribed arising centrally in the renal medulla. Size ranged from 4 to 12 cm (mean 7 cm) and hemorrhage and necrosis were common findings. All seven cases described showed sickled red blood cells in the tissue and six patients were confirmed to have sickle cell trait. All cases disclosed the characteristic reticular pattern consisting of tumor cell aggregates forming spaces of varied size, reminiscent of yolk sac testicular tumors of reticular type. Other findings included microcystic, tubular, trabecular, solid and adenoid-cystic patterns, rhabdoid-like cells and stromal desmoplasia. A peculiar feature was suppurative necrosis typically resembling microabscesses within epithelial aggregates. The medullary carcinoma of the 69-year-old patient was associated with a conventional clear cell carcinoma. To our knowledge, this association has not been previously reported and the patient is the oldest in the literature. The survival after diagnosis or admission ranged from 4 days to 9 months. The 8-year-old African-Brazilian patient with a circumscribed mass is alive and free of recurrence 8 years after diagnosis. This case raises the question whether a periodic search for renal medullary carcinoma in young patients who have known abnormalities of the hemoglobin gene and hematuria could result in an early diagnosis and a better survival.
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Yang LE, Leong PKK, McDonough AA. Reducing blood pressure in SHR with enalapril provokes redistribution of NHE3, NaPi2, and NCC and decreases NaPi2 and ACE abundance. Am J Physiol Renal Physiol 2007; 293:F1197-208. [PMID: 17652375 DOI: 10.1152/ajprenal.00040.2007] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
To determine the effects of long-term angiotensin-converting enzyme inhibition (ACEI) and blood pressure (BP) lowering on renal sodium transporter abundance and distribution in spontaneously hypertensive rats (SHR), 9-wk SHR were treated with enalapril (30 mg.kg(-1).day(-1)) for 4 wk. BP decreased from 156 +/- 4 to 96 +/- 8 mmHg. Na(+)/H(+) exchanger isoform 3 (NHE3) and Na(+)-P(i) cotransporter type 2 (NaPi2) localized to the body of the microvilli (MV) in normotensive rat strains. In untreated SHR, NHE3 partially retracted from the body to base of the MV and NaPi2 retracted to subapical vesicles. After enalapril treatment of SHR, NHE3 fully retracted to the base of the MV and, by density gradient fractionation, NHE3, NaPi2, dipeptidyl peptidase IV, myosin VI, Na-Cl cotransporter, and cortical Na-K-Cl cotransporter redistributed from low-density (apical enriched) to high-density (endosome enriched) membranes. Enalapril decreased total abundance of myosin VI (to 0.51 +/- 0.18 of untreated), ACE (0.67 +/- 0.22), and cortical NaPi2 (0.83 +/- 0.10). Normalizing SHR BP with HRH (7.5 mg/day hydralazine, 0.15 mg/day reserpine, and 3 mg/day hydrochlorothiazide) did not change Na(+) transporter density distribution or abundance. We conclude that lowering BP to normal levels in SHR does not normalize Na(+) transporter distribution, rather, chronic ACEI treatment provokes retraction of Na(+) transporters and associated proteins from transport-relevant domains of apical membranes and/or reduces their abundance.
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Affiliation(s)
- Li E Yang
- Department of Physiology and Biophysics, University of Southern California Keck School of Medicine, Los Angeles, CA 90089-9142, USA
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Kummeling MTM, de Jong BWD, Laffeber C, Kok DJ, Verhagen PCMS, van Leenders GJLH, van Schaik RHN, van Woerden CS, Verhulst A, Verkoelen CF. Tubular and interstitial nephrocalcinosis. J Urol 2007; 178:1097-103. [PMID: 17644134 DOI: 10.1016/j.juro.2007.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2006] [Indexed: 11/22/2022]
Abstract
PURPOSE We determined whether nephrocalcinosis is common and whether its detection is influenced by renal tissue processing. MATERIALS AND METHODS Renal cortical and papillary tissue was obtained from the unaffected parts of 15 kidneys removed due to an oncological indication. The effect of tissue processing on the loss of crystals was studied in a kidney with nephrocalcinosis due to chronic pyelonephritis. Immediately frozen and formaldehyde fixed sections were analyzed by polarized light and Raman spectroscopy, and stained for calcium (Yasue) and hyaluronan. RESULTS Although 13 of 15 snap-frozen sections from tumor kidneys contained birefringent particles (mean +/- SD 3.2 +/- 2.9 particles per cm(2)) in the renal tubules, this was not considered nephrocalcinosis because the crystals were not attached to the epithelial lining. Interstitial nephrocalcinosis was found on Yasue stain in 3 of 15 kidneys with tumor (20%). Calcium deposits were found in the papillary interstitium only, always together with hyaluronan. Formaldehyde fixed sections from the pyelonephritis kidney contained fewer renal tubular cell associated birefringent particles than immediately frozen sections (9.4 +/- 1.9 vs 41.6 +/- 1.2 per cm(2)). Particles were composed of calcium oxalate monohydrate (Yasue and Raman). CONCLUSIONS There are 2 distinct forms of nephrocalcinosis, including tubular nephrocalcinosis, which seems to be reserved for specific conditions such as chronic pyelonephritis, and interstitial nephrocalcinosis. The incidence of tubular calcium oxalate nephrocalcinosis could be underestimated due to the loss of crystals during tissue processing for routine histology. The crystal binding molecule hyaluronan may have a role in the 2 forms of nephrocalcinosis.
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Affiliation(s)
- Maxime T M Kummeling
- Department of Urology, Erasmus Medical Center Rotterdam, Rotterdam, The Netherlands
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Abstract
Cyclooxygenase-2 (Cox-2) is an inducible enzyme responsible for the formation of inflammatory prostanoids such as prostaglandins and thromboxane. Its role in the pathophysiology of inflammatory states like sepsis is increasingly recognized. Recently, we demonstrated that sepsis upregulates the endotoxin receptor Toll-like receptor 4 (TLR4) in rat kidney. Because Cox-2 is one of the downstream products of TLR4 activation, we hypothesized that sepsis-induced changes in renal Cox-2 expression are TLR4 dependent. Indeed, we show that in Sprague-Dawley rats, cecal ligation and puncture (a sepsis model) increases Cox-2 expression in cortical and medullary thick ascending loops (cTAL and mTAL, respectively) as well as inner medullary collecting ducts. These are all sites of increased TLR4 expression during sepsis. To determine the actual dependence on TLR4, we measured Cox-2 expression in wild-type and mutant mice which harbor a TLR4 gene deletion (TLR4-/-). In wild-type mice, sepsis increased Cox-2 expression in proximal tubules, cTAL, and mTAL. In contrast, septic TLR4-/- mice showed no significant increase in cTAL or mTAL Cox-2 expression. Furthermore, renin was absent from juxtaglomerular cells of TLR4-/- mice. We conclude that the dependence of sepsis-induced renal Cox-2 expression on TLR4 is tubule specific. The TLR4-dependent Cox-2 expression is mostly restricted to cortical and medullary thick ascending loops of Henle that characteristically express and secrete Tamm-Horsfall protein.
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Affiliation(s)
- Tarek M El-Achkar
- Indiana Center for Biological Mircroscopy, Department of Medicine, Division of Nephrology, Indiana University, Indianapolis, Indiana 46202, USA
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Doucet C, Zhang K, Desurmont T, Hebrard W, Scepi M, Nadeau C, Cau J, Leyre P, Febrer G, Carretier M, Richer JP, Papadopoulos V, Hauet T, Burucoa C, Goujon JM. Influence of warm ischemia time on peripheral-type benzodiazepine receptor: a new aspect of the role of mitochondria. Nephron Clin Pract 2007; 107:e1-11. [PMID: 17622771 DOI: 10.1159/000105139] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2006] [Accepted: 01/11/2007] [Indexed: 11/19/2022] Open
Abstract
The peripheral benzodiazepine receptor (PBR) is located mainly in the outer mitochondrial membrane and many functions are associated directly or indirectly with the PBR. We have studied the influence of different durations of warm ischemia (WI) on renal function, tissue damage and PBR expression in a Large Whitepig model. After a midline incision, the renal pedicle was clamped for 10 (WI10), 30 (WI30), 45 (WI45), 60 (WI60) or 90 min (WI90), and blood and renal tissue samples were collected between 1 day and 2 weeks after reperfusion for assessment of renal function. Metabolite excretion associated with renal ischemia reperfusion injury such as trimethylamine-N-oxide (TMAO) was quantified in blood by magnetic resonance spectroscopy. PBR mRNA and protein expression were determined in renal tissue. TMAO levels rose progressively and significantly with increasing duration of WI. PBR mRNA expression was upregulated between 3 h and 1 day after reperfusion in WI30, WI45 and WI60. Its upregulation was noted 3 days after reperfusion in WI90. At day 14, PBR transcript expression was not different from basal level in any group. PBR protein followed the same pattern. These findings suggest a new role for PBR which could be a major target in the regeneration process during ischemia reperfusion.
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Affiliation(s)
- Carole Doucet
- Inserm, E0 324, Poitiers and Université Poitiers, Poitiers, France
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