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Guo J, Zhang C, Zhao H, Yan Y, Liu Z. The key mediator of diabetic kidney disease: Potassium channel dysfunction. Genes Dis 2024; 11:101119. [PMID: 38523672 PMCID: PMC10958065 DOI: 10.1016/j.gendis.2023.101119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 06/11/2022] [Accepted: 06/04/2023] [Indexed: 03/26/2024] Open
Abstract
Diabetic kidney disease is a leading cause of end-stage renal disease, making it a global public health concern. The molecular mechanisms underlying diabetic kidney disease have not been elucidated due to its complex pathogenesis. Thus, exploring these mechanisms from new perspectives is the current focus of research concerning diabetic kidney disease. Ion channels are important proteins that maintain the physiological functions of cells and organs. Among ion channels, potassium channels stand out, because they are the most common and important channels on eukaryotic cell surfaces and function as the basis for cell excitability. Certain potassium channel abnormalities have been found to be closely related to diabetic kidney disease progression and genetic susceptibility, such as KATP, KCa, Kir, and KV. In this review, we summarized the roles of different types of potassium channels in the occurrence and development of diabetic kidney disease to discuss whether the development of DKD is due to potassium channel dysfunction and present new ideas for the treatment of DKD.
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Affiliation(s)
- Jia Guo
- Nephrology Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, Henan 450052, China
- Research Center for Kidney Disease, Zhengzhou, Henan 450052, China
| | - Chaojie Zhang
- Nephrology Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, Henan 450052, China
- Research Center for Kidney Disease, Zhengzhou, Henan 450052, China
| | - Hui Zhao
- Nephrology Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, Henan 450052, China
- Research Center for Kidney Disease, Zhengzhou, Henan 450052, China
| | - Yufan Yan
- Nephrology Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, Henan 450052, China
- Research Center for Kidney Disease, Zhengzhou, Henan 450052, China
| | - Zhangsuo Liu
- Nephrology Research Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- Key Laboratory of Precision Diagnosis and Treatment for Chronic Kidney Disease in Henan Province, Zhengzhou, Henan 450052, China
- Research Center for Kidney Disease, Zhengzhou, Henan 450052, China
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2
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Chelette BM, Thomas AM, Fadool DA. Long-term obesogenic diet and targeted deletion of potassium channel K v 1.3 have differing effects on voluntary exercise in mice. Physiol Rep 2020; 7:e14254. [PMID: 31646751 PMCID: PMC6811687 DOI: 10.14814/phy2.14254] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 09/03/2019] [Indexed: 12/27/2022] Open
Abstract
Voluntary exercise is frequently employed as an intervention for obesity. The voltage‐gated potassium channel Kv1.3 is also receiving attention as a therapeutic target for obesity, in addition to potential therapeutic capabilities for neuroinflammatory diseases. To investigate the combinatorial effects of these two therapies, we have compared the metabolic status and voluntary exercise behavior of both wild‐type mice and a transgenic line of mice that are genetic knockouts for Kv1.3 when provided with a running wheel and maintained on diets of differing fat content and caloric density. We tracked the metabolic parameters and wheel running behavior while maintaining the mice on their assigned treatment for 6 months. Wild‐type mice maintained on the fatty diet gain a significant amount of bodyweight and adipose tissue and display significantly impaired glucose tolerance, though all these effects were partially reduced with provision of a running wheel. Similar to previous studies, the Kv1.3‐null mice were resistant to obesity, increased adiposity, and impaired glucose tolerance. Both wild‐type and Kv1.3‐null mice maintained on the fatty diet displayed increased wheel running activity compared to control‐fed mice, which was caused primarily by a significant increase in the amount of time spent running as opposed to an increase in running velocity. Interestingly, the patterns of running behavior differed between wild‐type and Kv1.3‐null mice. Kv1.3‐null mice spent significantly less time running during the light phase and displayed a decrease in running 1–2 h before the onset of the light phase, seemingly in anticipation of the dark‐to‐light phase transition. These studies indicate that voluntary exercise combats metabolic maladies and running behavior is modified by both consumption of an obesogenic diet and deletion of the Kv1.3 channel.
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Affiliation(s)
- Brandon M Chelette
- Department of Biological Science, The Florida State University, Tallahassee, Florida.,Programs in Neuroscience, The Florida State University, Tallahassee, Florida
| | - Abigail M Thomas
- Department of Biological Science, The Florida State University, Tallahassee, Florida
| | - Debra Ann Fadool
- Department of Biological Science, The Florida State University, Tallahassee, Florida.,Programs in Neuroscience, The Florida State University, Tallahassee, Florida.,Molecular Biophysics, The Florida State University, Tallahassee, Florida
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3
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O'Donnell BM, Mackie TD, Subramanya AR, Brodsky JL. Endoplasmic reticulum-associated degradation of the renal potassium channel, ROMK, leads to type II Bartter syndrome. J Biol Chem 2017. [PMID: 28630040 DOI: 10.1074/jbc.m117.786376] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Type II Bartter syndrome is caused by mutations in the renal outer medullary potassium (ROMK) channel, but the molecular mechanisms underlying this disease are poorly defined. To rapidly screen for ROMK function, we developed a yeast expression system and discovered that yeast cells lacking endogenous potassium channels could be rescued by WT ROMK but not by ROMK proteins containing any one of four Bartter mutations. We also found that the mutant proteins were significantly less stable than WT ROMK. However, their degradation was slowed in the presence of a proteasome inhibitor or when yeast cells contained mutations in the CDC48 or SSA1 gene, which is required for endoplasmic reticulum (ER)-associated degradation (ERAD). Consistent with these data, sucrose gradient centrifugation and indirect immunofluorescence microscopy indicated that most ROMK protein was ER-localized. To translate these findings to a more relevant cell type, we measured the stabilities of WT ROMK and the ROMK Bartter mutants in HEK293 cells. As in yeast, the Bartter mutant proteins were less stable than the WT protein, and their degradation was slowed in the presence of a proteasome inhibitor. Finally, we discovered that low-temperature incubation increased the steady-state levels of a Bartter mutant, suggesting that the disease-causing mutation traps the protein in a folding-deficient conformation. These findings indicate that the underlying pathology for at least a subset of patients with type II Bartter syndrome is linked to the ERAD pathway and that future therapeutic strategies should focus on correcting deficiencies in ROMK folding.
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Affiliation(s)
- Brighid M O'Donnell
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260; Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Timothy D Mackie
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
| | - Arohan R Subramanya
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15261
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
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4
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Improvement of hERG-ROMK index of spirocyclic ROMK inhibitors through scaffold optimization and incorporation of novel pharmacophores. Bioorg Med Chem Lett 2017; 27:2559-2566. [DOI: 10.1016/j.bmcl.2017.03.086] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/26/2017] [Accepted: 03/28/2017] [Indexed: 12/15/2022]
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5
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Chobanian HR, Guo Y, Pio B, Tang H, Teumelsan N, Clements M, Frie J, Ferguson R, Guo Z, Thomas-Fowlkes BS, Felix JP, Liu J, Kohler M, Priest B, Hampton C, Pai LY, Corona A, Metzger J, Tong V, Joshi EM, Xu L, Owens K, Maloney K, Sullivan K, Pasternak A. The design and synthesis of novel spirocyclic heterocyclic sulfone ROMK inhibitors as diuretics. Bioorg Med Chem Lett 2017; 27:1109-1114. [DOI: 10.1016/j.bmcl.2016.10.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/11/2016] [Accepted: 10/12/2016] [Indexed: 10/20/2022]
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6
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Discovery of a potent and selective ROMK inhibitor with improved pharmacokinetic properties based on an octahydropyrazino[2,1-c][1,4]oxazine scaffold. Bioorg Med Chem Lett 2016; 26:5695-5702. [DOI: 10.1016/j.bmcl.2016.10.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Revised: 10/19/2016] [Accepted: 10/21/2016] [Indexed: 11/17/2022]
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Li X, Zhang Y, Chen Y, He W, Wan H, Zhang L, Hu Q, Feng J, Yuan J, Dong Q, Cao G, Zhang L, He F, Bai C, Tao W. WITHDRAWN: Discovery of SHR1977: A highly potent and selective ROMK inhibitor. Bioorg Med Chem Lett 2016:S0960-894X(16)30683-7. [PMID: 27377326 DOI: 10.1016/j.bmcl.2016.06.072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2016] [Revised: 06/23/2016] [Accepted: 06/25/2016] [Indexed: 11/17/2022]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- Xin Li
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Yun Zhang
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Yang Chen
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Wei He
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Hong Wan
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Lei Zhang
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Qiyue Hu
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Jun Feng
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Jijun Yuan
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Qing Dong
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Guoqing Cao
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Lianshan Zhang
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China; Jiangsu Hengrui Medicine Co., Ltd, Jiangsu Lianyungang 222047, China
| | - Feng He
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Chang Bai
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
| | - Weikang Tao
- Shanghai Hengrui Pharmaceutical Co., Ltd, 279 Wenjing Road, Shanghai 200245, China
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8
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Walsh SP, Shahripour A, Tang H, de Jesus RK, Teumelsan N, Zhu Y, Frie J, Priest BT, Swensen AM, Alonso-Galicia M, Felix JP, Brochu RM, Bailey T, Thomas-Fowlkes B, Zhou X, Pai LY, Hampton C, Hernandez M, Owens K, Ehrhart J, Roy S, Kaczorowski GJ, Yang L, Garcia ML, Pasternak A. Differentiation of ROMK potency from hERG potency in the phenacetyl piperazine series through heterocycle incorporation. Bioorg Med Chem Lett 2016; 26:2339-43. [DOI: 10.1016/j.bmcl.2016.03.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 03/08/2016] [Accepted: 03/10/2016] [Indexed: 01/29/2023]
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9
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Walsh SP, Shahripour A, Tang H, Teumelsan N, Frie J, Zhu Y, Priest BT, Swensen AM, Liu J, Margulis M, Visconti R, Weinglass A, Felix JP, Brochu RM, Bailey T, Thomas-Fowlkes B, Alonso-Galicia M, Zhou X, Pai LY, Corona A, Hampton C, Hernandez M, Bentley R, Chen J, Shah K, Metzger J, Forrest M, Owens K, Tong V, Ha S, Roy S, Kaczorowski GJ, Yang L, Parmee E, Garcia ML, Sullivan K, Pasternak A. Discovery of a Potent and Selective ROMK Inhibitor with Pharmacokinetic Properties Suitable for Preclinical Evaluation. ACS Med Chem Lett 2015; 6:747-52. [PMID: 26191360 DOI: 10.1021/ml500440u] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2014] [Accepted: 05/07/2015] [Indexed: 12/12/2022] Open
Abstract
A new subseries of ROMK inhibitors exemplified by 28 has been developed from the initial screening hit 1. The excellent selectivity for ROMK inhibition over related ion channels and pharmacokinetic properties across preclinical species support further preclinical evaluation of 28 as a new mechanism diuretic. Robust pharmacodynamic effects in both SD rats and dogs have been demonstrated.
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Affiliation(s)
- Shawn P. Walsh
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Aurash Shahripour
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Haifeng Tang
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Nardos Teumelsan
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Jessica Frie
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Yuping Zhu
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Lihu Yang
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Emma Parmee
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | | | | | - Alexander Pasternak
- Discovery Chemistry, ‡Department of Pharmacology, §Department of Cardiometabolic
Diseases, ∥Pharmacokinetic, Pharmacodynamics and Drug Metabolism, ⊥Department of Chemistry
Modeling and Informatics, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
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10
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Zhuo JL. AT2 receptors in cortical collecting ducts: a novel role in mediating ROMK-like K(+) channel responses to high dietary K(+)? Am J Physiol Renal Physiol 2014; 307:F1134-5. [PMID: 25186295 DOI: 10.1152/ajprenal.00479.2014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Affiliation(s)
- Jia L Zhuo
- Laboratory of Receptor and Signal Transduction, Department of Pharmacology and Toxicology, and Division of Nephrology, Department of Medicine, Cardiovascular Renal Research Center, University of Mississippi Medical Center, Jackson, Mississippi
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11
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Garcia ML, Kaczorowski GJ. Targeting the inward-rectifier potassium channel ROMK in cardiovascular disease. Curr Opin Pharmacol 2014; 15:1-6. [DOI: 10.1016/j.coph.2013.11.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 11/07/2013] [Accepted: 11/07/2013] [Indexed: 12/11/2022]
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12
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Chen Z, Dong H, Jia C, Song Q, Chen J, Zhang Y, Lai P, Fan X, Zhou X, Liu M, Lin J, Yang C, Li M, Gao T, Bai X. Activation of mTORC1 in collecting ducts causes hyperkalemia. J Am Soc Nephrol 2013; 25:534-45. [PMID: 24203997 DOI: 10.1681/asn.2013030225] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Mutation of TSC (encoding tuberous sclerosis complex protein) and activation of mammalian target of rapamycin (mTOR) have been implicated in the pathogenesis of several renal diseases, such as diabetic nephropathy and polycystic kidney disease. However, the role of mTOR in renal potassium excretion and hyperkalemia is not known. We showed that mice with collecting-duct (CD)-specific ablation of TSC1 (CDTsc1KO) had greater mTOR complex 1 (mTORC1) activation in the CD and demonstrated features of pseudohypoaldosteronism, including hyperkalemia, hyperaldosteronism, and metabolic acidosis. mTORC1 activation caused endoplasmic reticulum stress, columnar cell lesions, and dedifferentiation of CD cells with loss of aquaporin-2 and epithelial-mesenchymal transition-like phenotypes. Of note, mTORC1 activation also reduced the expression of serum- and glucocorticoid-inducible kinase 1, a crucial regulator of potassium homeostasis in the kidney, and decreased the expression and/or activity of epithelial sodium channel-α, renal outer medullary potassium channel, and Na(+), K(+)-ATPase in the CD, which probably contributed to the aldosterone resistance and hyperkalemia in these mice. Rapamycin restored these phenotypic changes. Overall, this study identifies a novel function of mTORC1 in regulating potassium homeostasis and demonstrates that loss of TSC1 and activation of mTORC1 results in dedifferentiation and dysfunction of the CD and causes hyperkalemia. The CDTsc1KO mice provide a novel model for hyperkalemia induced exclusively by dysfunction of the CD.
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13
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Christensen EI, Wagner CA, Kaissling B. Uriniferous tubule: structural and functional organization. Compr Physiol 2013; 2:805-61. [PMID: 23961562 DOI: 10.1002/cphy.c100073] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The uriniferous tubule is divided into the proximal tubule, the intermediate (thin) tubule, the distal tubule and the collecting duct. The present chapter is based on the chapters by Maunsbach and Christensen on the proximal tubule, and by Kaissling and Kriz on the distal tubule and collecting duct in the 1992 edition of the Handbook of Physiology, Renal Physiology. It describes the fine structure (light and electron microscopy) of the entire mammalian uriniferous tubule, mainly in rats, mice, and rabbits. The structural data are complemented by recent data on the location of the major transport- and transport-regulating proteins, revealed by morphological means(immunohistochemistry, immunofluorescence, and/or mRNA in situ hybridization). The structural differences along the uriniferous tubule strictly coincide with the distribution of the major luminal and basolateral transport proteins and receptors and both together provide the basis for the subdivision of the uriniferous tubule into functional subunits. Data on structural adaptation to defined functional changes in vivo and to genetical alterations of specified proteins involved in transepithelial transport importantly deepen our comprehension of the correlation of structure and function in the kidney, of the role of each segment or cell type in the overall renal function,and our understanding of renal pathophysiology.
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14
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Tang H, de Jesus RK, Walsh SP, Zhu Y, Yan Y, Priest BT, Swensen AM, Alonso-Galicia M, Felix JP, Brochu RM, Bailey T, Thomas-Fowlkes B, Zhou X, Pai LY, Hampton C, Hernandez M, Owens K, Roy S, Kaczorowski GJ, Yang L, Garcia ML, Pasternak A. Discovery of a novel sub-class of ROMK channel inhibitors typified by 5-(2-(4-(2-(4-(1H-Tetrazol-1-yl)phenyl)acetyl)piperazin-1-yl)ethyl)isobenzofuran-1(3H)-one. Bioorg Med Chem Lett 2013; 23:5829-32. [PMID: 24075732 DOI: 10.1016/j.bmcl.2013.08.104] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Revised: 08/23/2013] [Accepted: 08/27/2013] [Indexed: 10/26/2022]
Abstract
A sub-class of distinct small molecule ROMK inhibitors were developed from the original lead 1. Medicinal chemistry endeavors led to novel ROMK inhibitors with good ROMK functional potency and improved hERG selectivity. Two of the described ROMK inhibitors were characterized for the first in vivo proof-of-concept biology studies, and results from an acute rat diuresis model confirmed the hypothesis that ROMK inhibitors represent new mechanism diuretic and natriuretic agents.
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Affiliation(s)
- Haifeng Tang
- Department of Medicinal Chemistry, Rahway, NJ 07065, United States; Department of Ions Channels, Cardiovascular Disease, Rahway, NJ 07065, United States; Department of Drug Metabolism and Pharmacology, Rahway, NJ 07065, United States; Department of Merck Research Laboratories, Rahway, NJ 07065, United States.
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15
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Solenov EI, Baturina GS, Ilyaskin AV, Katkova LY, Ivanova LN. Cell volume regulation of rat kidney collecting duct epithelial cells in hypotonic medium. DOKLADY BIOLOGICAL SCIENCES : PROCEEDINGS OF THE ACADEMY OF SCIENCES OF THE USSR, BIOLOGICAL SCIENCES SECTIONS 2011; 436:13-15. [PMID: 21374003 DOI: 10.1134/s0012496611010108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Indexed: 05/30/2023]
Affiliation(s)
- E I Solenov
- Russian Academy of Sciences, Novosibirsk, Russia
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16
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Jones AM, Chory J, Dangl JL, Estelle M, Jacobsen SE, Meyerowitz EM, Nordborg M, Weigel D. The impact of Arabidopsis on human health: diversifying our portfolio. Cell 2008; 133:939-43. [PMID: 18555767 DOI: 10.1016/j.cell.2008.05.040] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Studies of the model plant Arabidopsis thaliana may seem to have little impact on advances in medical research, yet a survey of the scientific literature shows that this is a misconception. Many discoveries with direct relevance to human health and disease have been elaborated using Arabidopsis, and several processes important to human biology are more easily studied in this versatile model plant.
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Affiliation(s)
- Alan M Jones
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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17
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Troncoso Brindeiro CM, Fallet RW, Lane PH, Carmines PK. Potassium channel contributions to afferent arteriolar tone in normal and diabetic rat kidney. Am J Physiol Renal Physiol 2008; 295:F171-8. [PMID: 18495797 DOI: 10.1152/ajprenal.00563.2007] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We previously reported an enhanced tonic dilator impact of ATP-sensitive K+ channels in afferent arterioles of rats with streptozotocin (STZ)-induced diabetes. The present study explored the hypothesis that other types of K+ channel also contribute to afferent arteriolar dilation in STZ rats. The in vitro blood-perfused juxtamedullary nephron technique was utilized to quantify afferent arteriolar lumen diameter responses to K+ channel blockers: 0.1-3.0 mM 4-aminopyridine (4-AP; KV channels), 10-100 microM barium (KIR channels), 1-100 nM tertiapin-Q (TPQ; Kir1.1 and Kir3.x subfamilies of KIR channels), 100 nM apamin (SKCa channels), and 1 mM tetraethylammonium (TEA; BKCa channels). In kidneys from normal rats, 4-AP, TEA, and Ba2+ reduced afferent diameter by 23 +/- 3, 8 +/- 4, and 18 +/- 2%, respectively, at the highest concentrations employed. Neither TPQ nor apamin significantly altered afferent diameter. In arterioles from STZ rats, a constrictor response to TPQ (22 +/- 4% decrease in diameter) emerged, and the response to Ba2+ was exaggerated (28 +/- 5% decrease in diameter). Responses to the other K+ channel blockers were similar to those observed in normal rats. Moreover, exposure to either TPQ or Ba2+ reversed the afferent arteriolar dilation characteristic of STZ rats. Acute surgical papillectomy did not alter the response to TPQ in arterioles from normal or STZ rats. We conclude that 1) KV, KIR, and BKCa channels tonically influence normal afferent arteriolar tone, 2) KIR channels (including Kir1.1 and/or Kir3.x) contribute to the afferent arteriolar dilation during diabetes, and 3) the dilator impact of Kir1.1/Kir3.x channels during diabetes is independent of solute delivery to the macula densa.
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Affiliation(s)
- Carmen M Troncoso Brindeiro
- Department of Cellular and Integrative Physiology, University of Nebraska College of Medicine, Omaha, NE, USA
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18
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de Castro MP, Aránega A, Franco D. Protein distribution of Kcnq1, Kcnh2, and Kcne3 potassium channel subunits during mouse embryonic development. ACTA ACUST UNITED AC 2006; 288:304-15. [PMID: 16463373 DOI: 10.1002/ar.a.20312] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Voltage-dependent potassium channels consist of a pore-forming alpha-subunit, which is modulated by additional beta-ancillary or regulatory subunits. Kcnq1 and Kcnh2 alpha-channel subunits play pivotal roles in the developing and adult heart. However, Kcnq1 and Kcnh2 have a much wider expression profile than strictly confined to the myocardium, similar to their putative regulatory Kcne1-5 beta-subunits. At present, the distribution of distinct potassium channel subunits has been partially mapped in adult tissues, whereas almost no information is available during embryonic development. In this study, we report a detailed analysis of Kcnq1, Kcnh2, and Kcne3 protein expression during mouse embryogenesis. Our results demonstrate that Kcnq1 and Kcnh2 are widely distributed. Coexpression of both alpha-subunits is observed in a wide variety of organs, such as heart and the skeletal muscle, whereas others display unique Kcnq1 or Knch2 expression. Interestingly, Kcne3 expression is also widely observed in distinct tissue layers during embryogenesis, supporting the notion that an exquisite balance of alpha- and beta-subunit expression is required for modulating potassium conductance in distinct organs and tissue layers.
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Affiliation(s)
- María Pilar de Castro
- Cardiovascular Development Group, Department of Experimental Biology, University of Jaén, Jaén, Spain
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Abstract
We describe three critically ill patients who received drugs with K(ATP) channel-opening properties and subsequently developed severe life-threatening complications, including hyperkalaemia and cardiovascular disturbances. Administration of the sulfonylurea-receptor inhibitor glibenclamide promptly reversed these abnormalities. Over the past 3 years, we have seen this syndrome and response in five patients taking nicorandil, ciclosporin, or isoflurane, which suggests that this disorder arises more frequently than is currently realised.
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O'Grady SM, Lee SY. Molecular diversity and function of voltage-gated (Kv) potassium channels in epithelial cells. Int J Biochem Cell Biol 2005; 37:1578-94. [PMID: 15882958 DOI: 10.1016/j.biocel.2005.04.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2004] [Revised: 03/27/2005] [Accepted: 04/05/2005] [Indexed: 01/17/2023]
Abstract
Voltage-gated K+ channels belonging to Kv1-9 subfamilies are widely expressed in excitable cells where they play an essential role in membrane hyperpolarization during an action potential and in the propagation of action potentials along the plasma membrane. Early patch clamp studies on epithelial cells revealed the presence of K+ currents with biophysical and pharmacologic properties characteristic of Kv channels expressed in excitable cells. More recently, molecular approaches including PCR and the availability of more selective antibodies directed against Kv alpha and auxiliary subunits, have demonstrated that epithelial cells from various organ systems, express a remarkable diversity Kv channel subunits. Unlike neurons and myocytes however, epithelial cells do not typically generate action potentials or exhibit dynamic changes in membrane potential necessary for activation of Kv alpha subunits. Moreover, the fact that many Kv channels expressed in epithelial cells exhibit inactivation suggest that their activities are relatively transient, making it difficult to ascribe a functional role for these channels in transepithelial electrolyte or nutrient transport. Other proposed functions have included (i) cell migration and wound healing, (ii) cell proliferation and cancer, (iii) apoptosis and (iv) O2 sensing. Certain Kv channels, particularly Kv1 and Kv2 subfamily members, have been shown to be involved in the proliferation of prostate, colon, lung and breast carcinomas. In some instances, a significant increase in Kv channel expression has been correlated with tumorogenesis suggesting the possibility of using these proteins as markers for transformation and perhaps reducing the rate of tumor growth by selectively inhibiting their functional activity.
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Affiliation(s)
- Scott M O'Grady
- Department of Physiology, University of Minnesota, 495 Animal Science/Veterinary Medicine Building, 1998 Fitch Avenue, St. Paul, MN 55108, USA.
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