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Judd E, Kumar V, Porrett PM, Hyndman KA, Anderson DJ, Jones-Carr ME, Shunk A, Epstein DR, Fatima H, Katsurada A, Satou R, Navar LG, Locke JE. Physiologic homeostasis after pig-to-human kidney xenotransplantation. Kidney Int 2024; 105:971-979. [PMID: 38290599 DOI: 10.1016/j.kint.2024.01.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 10/31/2023] [Revised: 12/15/2023] [Accepted: 01/09/2024] [Indexed: 02/01/2024]
Abstract
Demand for kidney grafts outpaces supply, limiting kidney transplantation as a treatment for kidney failure. Xenotransplantation has the potential to make kidney transplantation available to many more patients with kidney failure, but the ability of xenografts to support human physiologic homeostasis has not been established. A brain-dead adult decedent underwent bilateral native nephrectomies followed by 10 gene-edited (four gene knockouts, six human transgenes) pig-to-human xenotransplantation. Physiologic parameters and laboratory values were measured for seven days in a critical care setting. Data collection aimed to assess homeostasis by measuring components of the renin-angiotensin-aldosterone system, parathyroid hormone signaling, glomerular filtration rate, and markers of salt and water balance. Mean arterial blood pressure was maintained above 60 mmHg throughout. Pig kidneys secreted renin (post-operative day three to seven mean and standard deviation: 47.3 ± 9 pg/mL). Aldosterone and angiotensin II levels were present (post-operative day three to seven, 57.0 ± 8 pg/mL and 5.4 ± 4.3 pg/mL, respectively) despite plasma renin activity under 0.6 ng/mL/hr. Parathyroid hormone levels followed ionized calcium. Urine output down trended from 37 L to 6 L per day with 4.5 L of electrolyte free water loss on post-operative day six. Aquaporin 2 channels were detected in the apical surface of principal cells, supporting pig kidney response to human vasopressin. Serum creatinine down trended to 0.9 mg/dL by day seven. Glomerular filtration rate ranged 90-240 mL/min by creatinine clearance and single-dose inulin clearance. Thus, in a human decedent model, xenotransplantation of 10 gene-edited pig kidneys provided physiologic balance for seven days. Hence, our in-human study paves the way for future clinical study of pig-to-human kidney xenotransplantation in living persons.
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Affiliation(s)
- Eric Judd
- Department of Medicine, Division of Nephrology, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Vineeta Kumar
- Department of Medicine, Division of Nephrology, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Paige M Porrett
- Department of Surgery, Division of Transplantation, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Kelly A Hyndman
- Department of Medicine, Division of Nephrology, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Douglas J Anderson
- Department of Surgery, Division of Transplantation, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Maggie E Jones-Carr
- Department of Surgery, Division of Transplantation, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | | | - Daniel R Epstein
- Department of Surgery, Division of Transplantation, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Huma Fatima
- Department of Pathology, Division of Anatomic Pathology, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA
| | - Akemi Katsurada
- Department of Physiology and Hypertension and Renal Center, Tulane University, New Orleans, Louisianna, USA
| | - Ryousuke Satou
- Department of Physiology and Hypertension and Renal Center, Tulane University, New Orleans, Louisianna, USA
| | - L Gabriel Navar
- Department of Physiology and Hypertension and Renal Center, Tulane University, New Orleans, Louisianna, USA
| | - Jayme E Locke
- Department of Surgery, Division of Transplantation, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, Alabama, USA.
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Dou H, Xu M, Zhang Z, Luo D, Yu A, Chen Z. Biomass Solid-State Electrolyte with Abundant Ion and Water Channels for Flexible Zinc-Air Batteries. Adv Mater 2024:e2401858. [PMID: 38569594 DOI: 10.1002/adma.202401858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 03/24/2024] [Indexed: 04/05/2024]
Abstract
Flexible zinc-air batteries are the leading candidates as the next-generation power source for flexible/wearable electronics. However, constructing the safe and high-performance solid-state electrolytes (SSEs) with intrinsic hydroxide ion (OH-) conduction remains a fundamental challenge. Herein, by adopting the natural and robust cellulose nanofibers (CNFs) as building blocks, the biomass SSEs with penetrating ion and water channels are constructed by knitting the OH--conductive CNFs and water-retentive CNFs together via an energy-efficient tape casting. Benefiting from the abundant ion and water channels with interconnected hydrated OH- wires for fast OH- conduction under nanoconfined environment, the biomass SSEs reveal the high water-uptake, impressive OH- conductivity of 175 mS·cm-1 and mechanical robustness simultaneously, which overcomes the commonly existed dilemma between ion conductivity and mechanical property. Remarkably, the flexible zinc-air batteries assembled with biomass SSEs deliver exceptional cycle lifespan of 310 hours and power density of 126 mW·cm-2. The design methodology for water and ion channels opens a new avenue to design high-performance SSEs for batteries. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Haozhen Dou
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Mi Xu
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Zhen Zhang
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Dan Luo
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Aiping Yu
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
| | - Zhongwei Chen
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
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Tsilosani A, Gao C, Chen E, Lightle AR, Shehzad S, Sharma M, Tran PV, Bates CM, Wallace DP, Zhang W. Pkd2 Deficiency in Embryonic Aqp2 + Progenitor Cells Is Sufficient to Cause Severe Polycystic Kidney Disease. J Am Soc Nephrol 2024; 35:398-409. [PMID: 38254271 PMCID: PMC11000715 DOI: 10.1681/asn.0000000000000309] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 10/09/2023] [Accepted: 01/01/2024] [Indexed: 01/24/2024] Open
Abstract
SIGNIFICANCE STATEMENT Autosomal dominant polycystic kidney disease (ADPKD) is a devastating disorder caused by mutations in polycystin 1 ( PKD1 ) and polycystin 2 ( PKD2 ). Currently, the mechanism for renal cyst formation remains unclear. Here, we provide convincing and conclusive data in mice demonstrating that Pkd2 deletion in embryonic Aqp2 + progenitor cells (AP), but not in neonate or adult Aqp2 + cells, is sufficient to cause severe polycystic kidney disease (PKD) with progressive loss of intercalated cells and complete elimination of α -intercalated cells, accurately recapitulating a newly identified cellular phenotype of patients with ADPKD. Hence, Pkd2 is a new potential regulator critical for balanced AP differentiation into, proliferation, and/or maintenance of various cell types, particularly α -intercalated cells. The Pkd2 conditional knockout mice developed in this study are valuable tools for further studies on collecting duct development and early steps in cyst formation. The finding that Pkd2 loss triggers the loss of intercalated cells is a suitable topic for further mechanistic studies. BACKGROUND Most cases of autosomal dominant polycystic kidney disease (ADPKD) are caused by mutations in PKD1 or PKD2. Currently, the mechanism for renal cyst formation remains unclear. Aqp2 + progenitor cells (AP) (re)generate ≥5 cell types, including principal cells and intercalated cells in the late distal convoluted tubules (DCT2), connecting tubules, and collecting ducts. METHODS Here, we tested whether Pkd2 deletion in AP and their derivatives at different developmental stages is sufficient to induce PKD. Aqp2Cre Pkd2f/f ( Pkd2AC ) mice were generated to disrupt Pkd2 in embryonic AP. Aqp2ECE/+Pkd2f/f ( Pkd2ECE ) mice were tamoxifen-inducted at P1 or P60 to inactivate Pkd2 in neonate or adult AP and their derivatives, respectively. All induced mice were sacrificed at P300. Immunofluorescence staining was performed to categorize and quantify cyst-lining cell types. Four other PKD mouse models and patients with ADPKD were similarly analyzed. RESULTS Pkd2 was highly expressed in all connecting tubules/collecting duct cell types and weakly in all other tubular segments. Pkd2AC mice had obvious cysts by P6 and developed severe PKD and died by P17. The kidneys had reduced intercalated cells and increased transitional cells. Transitional cells were negative for principal cell and intercalated cell markers examined. A complete loss of α -intercalated cells occurred by P12. Cysts extended from the distal renal segments to DCT1 and possibly to the loop of Henle, but not to the proximal tubules. The induced Pkd2ECE mice developed mild PKD. Cystic α -intercalated cells were found in the other PKD models. AQP2 + cells were found in cysts of only 13/27 ADPKD samples, which had the same cellular phenotype as Pkd2AC mice. CONCLUSIONS Hence, Pkd2 deletion in embryonic AP, but unlikely in neonate or adult Aqp2 + cells (principal cells and AP), was sufficient to cause severe PKD with progressive elimination of α -intercalated cells, recapitulating a newly identified cellular phenotype of patients with ADPKD. We proposed that Pkd2 is critical for balanced AP differentiation into, proliferation, and/or maintenance of cystic intercalated cells, particularly α -intercalated cells.
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Affiliation(s)
- Akaki Tsilosani
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York
| | - Chao Gao
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York
| | - Enuo Chen
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York
| | - Andrea R. Lightle
- Department of Pathology and Laboratory Medicine, Albany Medical College, Albany, New York
| | - Sana Shehzad
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York
| | - Madhulika Sharma
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas
- Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Pamela V. Tran
- Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, Kansas
| | - Carlton M. Bates
- Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Darren P. Wallace
- Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas
- Jared Grantham Kidney Institute, University of Kansas Medical Center, Kansas City, Kansas
| | - Wenzheng Zhang
- Department of Regenerative and Cancer Cell Biology, Albany Medical College, Albany, New York
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Pellavio G, Demichelis MP, Sommi P, Anselmi-Tamburini U, Scotti C, Laforenza U. Polyacrylic-Coated Solid Nanoparticles Increase the Aquaporin Permeability to Hydrogen Peroxide. Int J Mol Sci 2023; 25:372. [PMID: 38203543 PMCID: PMC10778986 DOI: 10.3390/ijms25010372] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 11/27/2023] [Revised: 12/21/2023] [Accepted: 12/24/2023] [Indexed: 01/12/2024] Open
Abstract
Aquaporins (AQPs) allow the diffusion of hydrogen peroxide (H2O2) and act as ROS scavenging systems, which are important for controlling the redox state of cells. Recently, cerium oxide nanoparticles were found to increase the water and H2O2 permeability by modulating AQPs. To further analyze the action of nanoparticles (NPs) on AQP, we examined the effect of the NPs presenting different core compositions (CeO2, Gd2O3, Fe3O4, and TiO2), hydrodynamic sizes, and surface functionalization. The NPs produced an increase in H2O and H2O2 permeability as a general trend. The hydrodynamic sizes of the NPs in the range of 22-100 nm did not produce any significant effect. The chemical nature of the NPs' core did not modify the effect and its intensity. On the other hand, the NPs' functionalized surface plays a major role in influencing both water and H2O2 permeability. The results suggest that NPs can play a significant role in controlling oxidative stress in cells and might represent an innovative approach in the treatment of a number of pathologies associated with an increased oxidative status.
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Affiliation(s)
- Giorgia Pellavio
- Human Physiology Unit, Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy; (G.P.); (P.S.)
| | | | - Patrizia Sommi
- Human Physiology Unit, Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy; (G.P.); (P.S.)
| | | | - Claudia Scotti
- Unit of Immunology and General Pathology, Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy;
| | - Umberto Laforenza
- Human Physiology Unit, Department of Molecular Medicine, University of Pavia, 27100 Pavia, Italy; (G.P.); (P.S.)
- Center for Health Technologies (CHT), University of Pavia, 27100 Pavia, Italy
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Barile B, Mola MG, Formaggio F, Saracino E, Cibelli A, Gargano CD, Mogni G, Frigeri A, Caprini M, Benfenati V, Nicchia GP. AQP4-independent TRPV4 modulation of plasma membrane water permeability. Front Cell Neurosci 2023; 17:1247761. [PMID: 37720545 PMCID: PMC10500071 DOI: 10.3389/fncel.2023.1247761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Accepted: 08/14/2023] [Indexed: 09/19/2023] Open
Abstract
Despite of the major role of aquaporin (AQP) water channels in controlling transmembrane water fluxes, alternative ways for modulating water permeation have been proposed. In the Central Nervous System (CNS), Aquaporin-4 (AQP4) is reported to be functionally coupled with the calcium-channel Transient-Receptor Potential Vanilloid member-4 (TRPV4), which is controversially involved in cell volume regulation mechanisms and water transport dynamics. The present work aims to investigate the selective role of TRPV4 in regulating plasma membrane water permeability in an AQP4-independent way. Fluorescence-quenching water transport experiments in Aqp4-/- astrocytes revealed that cell swelling rate is significantly increased upon TRPV4 activation and in the absence of AQP4. The biophysical properties of TRPV4-dependent water transport were therefore assessed using the HEK-293 cell model. Calcein quenching experiments showed that chemical and thermal activation of TRPV4 overexpressed in HEK-293 cells leads to faster swelling kinetics. Stopped-flow light scattering water transport assay was used to measure the osmotic permeability coefficient (Pf, cm/s) and activation energy (Ea, kcal/mol) conferred by TRPV4. Results provided evidence that although the Pf measured upon TRPV4 activation is lower than the one obtained in AQP4-overexpressing cells (Pf of AQP4 = 0.01667 ± 0.0007; Pf of TRPV4 = 0.002261 ± 0.0004; Pf of TRPV4 + 4αPDD = 0.007985 ± 0.0006; Pf of WT = 0.002249 ± 0.0002), along with activation energy values (Ea of AQP4 = 0.86 ± 0.0006; Ea of TRPV4 + 4αPDD = 2.73 ± 1.9; Ea of WT = 8.532 ± 0.4), these parameters were compatible with a facilitated pathway for water movement rather than simple diffusion. The possibility to tune plasma membrane water permeability more finely through TRPV4 might represent a protective mechanism in cells constantly facing severe osmotic challenges to avoid the potential deleterious effects of the rapid cell swelling occurring via AQP channels.
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Affiliation(s)
- Barbara Barile
- Department of Bioscience, Biotechnology and Environment, University of Bari Aldo Moro, Bari, Italy
| | - Maria Grazia Mola
- Department of Bioscience, Biotechnology and Environment, University of Bari Aldo Moro, Bari, Italy
| | - Francesco Formaggio
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Emanuela Saracino
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Bologna, Italy
| | - Antonio Cibelli
- Department of Bioscience, Biotechnology and Environment, University of Bari Aldo Moro, Bari, Italy
| | - Concetta Domenica Gargano
- Department of Translational Biomedicine and Neuroscience (DiBraiN), School of Medicine, University of Bari Aldo Moro, Bari, Italy
| | - Guido Mogni
- Department of Bioscience, Biotechnology and Environment, University of Bari Aldo Moro, Bari, Italy
| | - Antonio Frigeri
- Department of Translational Biomedicine and Neuroscience (DiBraiN), School of Medicine, University of Bari Aldo Moro, Bari, Italy
- Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, 840 Kennedy Center, Bronx, NY, United States
| | - Marco Caprini
- Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Valentina Benfenati
- Institute for Organic Synthesis and Photoreactivity (ISOF), National Research Council of Italy (CNR), Bologna, Italy
| | - Grazia Paola Nicchia
- Department of Bioscience, Biotechnology and Environment, University of Bari Aldo Moro, Bari, Italy
- Dominick P. Purpura Department of Neuroscience, Albert Einstein College of Medicine, 840 Kennedy Center, Bronx, NY, United States
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Morelle J, Lambie M, Öberg CM, Davies S. The Peritoneal Membrane and its Role in Peritoneal Dialysis. Clin J Am Soc Nephrol 2023; 19:01277230-990000000-00223. [PMID: 37616463 PMCID: PMC10861113 DOI: 10.2215/cjn.0000000000000282] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 08/03/2023] [Indexed: 08/26/2023]
Abstract
A healthy and functional peritoneal membrane is key to achieve sufficient ultrafiltration and to restore fluid balance, a major component of high-quality prescription in patients treated with peritoneal dialysis (PD). Variability in membrane function at the start of PD or changes over time on treatment influence dialysis prescription and outcomes, and dysfunction of the peritoneal membrane contributes to fluid overload and associated complications. In this review, we summarize the current knowledge about the structure, function and pathophysiology of the peritoneal membrane with a focus on clinical implications for patient-centered care. We also discuss the molecular and genetic mechanisms of solute and water transport across the peritoneal membrane, including the role of aquaporin water channels in crystalloid vs. colloid osmosis; why and how to assess membrane function using peritoneal equilibration tests; the etiologies of membrane dysfunction and their specific management; and the impact of genetic variation on membrane function and outcomes in patients treated with PD. This review also identifies the gaps in current knowledge and perspectives for future research to improve our understanding of the peritoneal membrane and, ultimately, to improve the care of patients treated with PD.
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Affiliation(s)
- Johann Morelle
- Division of Nephrology, Cliniques universitaires Saint-Luc, Brussels, Belgium
- UCLouvain School of Medicine, UCLouvain, Brussels, Belgium
| | - Mark Lambie
- Faculty of Medicine and Health Sciences, Keele University, Keele, United Kingdom
| | - Carl M. Öberg
- Division of Nephrology, Department of Clinical Sciences Lund, Lund University, Lund, Sweden
| | - Simon Davies
- Faculty of Medicine and Health Sciences, Keele University, Keele, United Kingdom
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Pellavio G, Sommi P, Anselmi-Tamburini U, DeMichelis MP, Coniglio S, Laforenza U. Cerium Oxide Nanoparticles Regulate Oxidative Stress in HeLa Cells by Increasing the Aquaporin-Mediated Hydrogen Peroxide Permeability. Int J Mol Sci 2022; 23:ijms231810837. [PMID: 36142747 PMCID: PMC9506032 DOI: 10.3390/ijms231810837] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 09/08/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022] Open
Abstract
Some aquaporins (AQPs) allow the diffusion of hydrogen peroxide (H2O2), the most abundant ROS, through the cell membranes. Therefore, the possibility of regulating the AQP-mediated permeability to H2O2, and thus ROS scavenging, appears particularly important for controlling the redox state of cells in physiological and pathophysiological conditions. Several compounds have been screened and characterized for this purpose. This study aimed to analyze the effect of cerium oxide nanoparticles (CNPs) presenting antioxidant activity on AQP functioning. HeLa cells express AQP3, 6, 8, and 11, able to facilitate H2O2. AQP3, 6, and 8 are expressed in the plasma membrane and intracellularly, while AQP11 resides only in intracellular structures. CNPs but not cerium ions treatment significantly increased the water and H2O2 permeability by interacting with AQP3, 6, and especially with AQP8. CNPs increased considerably the AQP-mediated water diffusion in cells with oxidative stress. Functional experiments with silenced HeLa cells revealed that CNPs increased the H2O2 diffusion mainly by modulating the AQP8 permeability but also the AQP3 and AQP6, even if to a lesser extent. Current findings suggest that CNPs represent a promising pharmaceutical agent that might potentially be used in numerous pathologies involving oxidative stress as tumors and neurodegenerative diseases.
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Affiliation(s)
- Giorgia Pellavio
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, 27100 Pavia, Italy
| | - Patrizia Sommi
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, 27100 Pavia, Italy
| | | | | | - Stefania Coniglio
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, 27100 Pavia, Italy
| | - Umberto Laforenza
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, 27100 Pavia, Italy
- Correspondence: ; Tel.: +39-0382-98-7568
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Dai C, Zhao D, Wang Y, Zhao R, Wang H, Wu X, Liu S, Zhu H, Fu J, Zhang M, Ding H. Impact of Graphene Oxide on Properties and Structure of Thin-Film Composite Forward Osmosis Membranes. Polymers (Basel) 2022; 14:3874. [PMID: 36146018 DOI: 10.3390/polym14183874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 09/02/2022] [Accepted: 09/08/2022] [Indexed: 11/28/2022] Open
Abstract
Forward osmosis (FO) membranes have the advantages of low energy consumption, high water recovery rate, and low membrane pollution trend, and they have been widely studied in many fields. However, the internal concentration polarization (ICP) caused by the accumulation of solutes in the porous support layer will reduce permeation efficiency, which is currently unavoidable. In this paper, we doped Graphene oxide (GO) nanoparticles (50~150 nm) to a polyamide (PA) active layer and/or polysulfone (PSF) support layer, investigating the influence of GO on the morphology and properties of thin-film composite forward osmosis (TFC-FO) membranes. The results show that under the optimal doping amount, doping GO to the PA active layer and PSF support layer, respectively, is conducive to the formation of dense and uniform nano-scale water channels perpendicular to the membrane surface possessing a high salt rejection rate and low reverse solute flux without sacrificing high water flux. Moreover, the water channels formed by doping GO to the active layer possess preferable properties, which significantly improves the salt rejection and water permeability of the membrane, with a salt rejection rate higher than 99% and a water flux of 54.85 L·m−2·h−1 while the pure PSF-PA membrane water flux is 12.94 L·m−2·h−1. GO-doping modification is promising for improving the performance and structure of TFC-FO membranes.
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Foguesatto K, Lopes FM, Boyle RT, Nery LEM, Souza MM. Can hypoosmotic shock and calcium influx lead to translocation of Aquaporin-1 in shrimp muscle cells? Cell Biol Int 2022; 46:976-985. [PMID: 35257436 DOI: 10.1002/cbin.11788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 02/07/2022] [Accepted: 02/28/2022] [Indexed: 11/06/2022]
Abstract
The physiological variations during the crustacean molting cycle have intrigued researchers for many years. Maintaining osmotic homeostasis in the face of hemolymph dilution and dealing with dynamic intracellular and extracellular calcium fluctuations are challenges these animals continuously confront. It has recently been shown that water channels present in the cell membrane (aquaporins) are essential for water uptake during pre-molt and post-molt. This study aims to investigate whether hypoosmotic shock and intracellular and extracellular calcium variations can lead to translocation of aquaporin 1 (AQP-1) from the intracellular region to the plasma membrane during pre-molt and post-molt, thus allowing increased water flow in these stages. For this, we investigate in vitro the rapid change of AQP-1 positions in the abdominal muscle cells in the freshwater shrimp, P. argentinus. Using cell volume analysis and immunohistochemistry, we show that hypoosmotic conditions and an elevation of the intracellular and extracellular calcium concentrations are concurrent with the translocation of AQP-1 to the plasma membrane. These results indicate that calcium flux and hypoosmotic shock may be regulators of aquaporin 1 in the translocation process. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Kamila Foguesatto
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande - FURG, Av. Itália km 8, 96.203-900, Rio Grande, Rio Grande do Sul, Brasil
| | - Fernanda Moreira Lopes
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande - FURG, Av. Itália km 8, 96.203-900, Rio Grande, Rio Grande do Sul, Brasil
| | - Robert Tew Boyle
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande - FURG, Av. Itália km 8, 96.203-900, Rio Grande, Rio Grande do Sul, Brasil.,Instituto de Ciências Biológicas, Universidade Federal do Rio Grande- FURG, Av. Itália km 8, 96.203-900, Rio Grande, RS, Brasil
| | - Luiz Eduardo Maia Nery
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande - FURG, Av. Itália km 8, 96.203-900, Rio Grande, Rio Grande do Sul, Brasil.,Instituto de Ciências Biológicas, Universidade Federal do Rio Grande- FURG, Av. Itália km 8, 96.203-900, Rio Grande, RS, Brasil
| | - Marta Marques Souza
- Programa de Pós-Graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande - FURG, Av. Itália km 8, 96.203-900, Rio Grande, Rio Grande do Sul, Brasil.,Instituto de Ciências Biológicas, Universidade Federal do Rio Grande- FURG, Av. Itália km 8, 96.203-900, Rio Grande, RS, Brasil
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Affiliation(s)
- Barbara K Pierscionek
- Faculty of Health, Education, Medicine and Social Care, Medical Technology Research Centre, Anglia Ruskin University, Chelmsford Campus, Chelmsford UK
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11
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Pellavio G, Rossino G, Gastaldi G, Rossi D, Linciano P, Collina S, Laforenza U. Sigma-1 Receptor Agonists Acting on Aquaporin-Mediated H 2O 2 Permeability: New Tools for Counteracting Oxidative Stress. Int J Mol Sci 2021; 22:9790. [PMID: 34575952 PMCID: PMC8467392 DOI: 10.3390/ijms22189790] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 06/15/2021] [Revised: 09/02/2021] [Accepted: 09/08/2021] [Indexed: 12/13/2022] Open
Abstract
Sigma1 Receptor (S1R) is involved in oxidative stress, since its activation is triggered by oxidative or endoplasmic reticulum stress. Since specific aquaporins (AQP), called peroxiporins, play a relevant role in controlling H2O2 permeability and ensure reactive oxygen species wasted during oxidative stress, we studied the effect of S1R modulators on AQP-dependent water and hydrogen peroxide permeability in the presence and in the absence of oxidative stress. Applying stopped-flow light scattering and fluorescent probe methods, water and hydrogen peroxide permeability in HeLa cells have been studied. Results evidenced that S1R agonists can restore water permeability in heat-stressed cells and the co-administration with a S1R antagonist totally counteracted the ability to restore the water permeability. Moreover, compounds were able to counteract the oxidative stress of HeLa cells specifically knocked down for S1R. Taken together these results support the hypothesis that the antioxidant mechanism is mediated by both S1R and AQP-mediated H2O2 permeability. The finding that small molecules can act on both S1R and AQP-mediated H2O2 permeability opens a new direction toward the identification of innovative drugs able to regulate cell survival during oxidative stress in pathologic conditions, such as cancer and degenerative diseases.
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Affiliation(s)
- Giorgia Pellavio
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, I-27100 Pavia, Italy; (G.P.); (G.G.)
| | - Giacomo Rossino
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, I-27100 Pavia, Italy; (G.R.); (D.R.); (P.L.); (S.C.)
| | - Giulia Gastaldi
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, I-27100 Pavia, Italy; (G.P.); (G.G.)
- Centre for Health Technology (CHT), University of Pavia, I-27100 Pavia, Italy
| | - Daniela Rossi
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, I-27100 Pavia, Italy; (G.R.); (D.R.); (P.L.); (S.C.)
| | - Pasquale Linciano
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, I-27100 Pavia, Italy; (G.R.); (D.R.); (P.L.); (S.C.)
| | - Simona Collina
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, I-27100 Pavia, Italy; (G.R.); (D.R.); (P.L.); (S.C.)
| | - Umberto Laforenza
- Department of Molecular Medicine, Human Physiology Unit, University of Pavia, I-27100 Pavia, Italy; (G.P.); (G.G.)
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12
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Scochera F, Zerbetto De Palma G, Canessa Fortuna A, Chevriau J, Toriano R, Soto G, Zeida A, Alleva K. PIP aquaporin pH sensing is regulated by the length and charge of the C-terminal region. FEBS J 2021; 289:246-261. [PMID: 34293244 DOI: 10.1111/febs.16134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 07/01/2021] [Accepted: 07/21/2021] [Indexed: 11/27/2022]
Abstract
Plant PIP aquaporins play a central role in controlling plant water status. The current structural model for PIP pH-gating states that the main pH sensor is located in loopD and that all the mobile cytosolic elements participate in a complex interaction network that ensures the closed structure. However, the precise participation of the last part of the C-terminal domain (CT) in PIP pH gating remains unknown. This last part has not been resolved in PIP crystal structures and is a key difference between PIP1 and PIP2 paralogues. Here, by a combined experimental and computational approach, we provide data about the role of CT in pH gating of Beta vulgaris PIP. We demonstrate that the length of CT and the positive charge located among its last residues modulate the pH at which the open/closed transition occurs. We also postulate a molecular-based mechanism for the differential pH sensing in PIP homo- or heterotetramers by performing atomistic molecular dynamics simulations (MDS) on complete models of PIP tetramers. Our findings show that the last part of CT can affect the environment of loopD pH sensors in the closed state. Results presented herein contribute to the understanding of how the characteristics of CT in PIP channels play a crucial role in determining the pH at which water transport through these channels is blocked, highlighting the relevance of the differentially conserved very last residues in PIP1 and PIP2 paralogues.
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Affiliation(s)
- Florencia Scochera
- Facultad de Farmacia y Bioquímica, Departamento de Fisicomatemática, Universidad de Buenos Aires, Argentina
| | - Gerardo Zerbetto De Palma
- Facultad de Farmacia y Bioquímica, Departamento de Fisicomatemática, Universidad de Buenos Aires, Argentina.,Instituto de Química y Fisicoquímica Biológica (IQUIFIB), Facultad de Farmacia y Bioquímica, CONICET, Universidad de Buenos Aires, Argentina.,Instituto de Biotecnología, Universidad Nacional de Hurlingham, Villa Tesei, Argentina
| | - Agustina Canessa Fortuna
- Facultad de Farmacia y Bioquímica, Departamento de Fisicomatemática, Universidad de Buenos Aires, Argentina
| | - Jonathan Chevriau
- Instituto de Química y Fisicoquímica Biológica (IQUIFIB), Facultad de Farmacia y Bioquímica, CONICET, Universidad de Buenos Aires, Argentina
| | - Roxana Toriano
- Facultad de Medicina, CONICET, Instituto de Fisiología y Biofísica "Bernardo Houssay" (IFIBIO "Houssay"), Universidad de Buenos Aires, Argentina
| | - Gabriela Soto
- Instituto de Agrobiotecnología y Biología Molecular (INTA-CONICET), Buenos Aires, Argentina.,Instituto de Genética (INTA), Buenos Aires, Argentina
| | - Ari Zeida
- Departamento de Bioquímica and Centro de Investigaciones Biomédicas (Ceinbio), Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Karina Alleva
- Facultad de Farmacia y Bioquímica, Departamento de Fisicomatemática, Universidad de Buenos Aires, Argentina.,Instituto de Química y Fisicoquímica Biológica (IQUIFIB), Facultad de Farmacia y Bioquímica, CONICET, Universidad de Buenos Aires, Argentina
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13
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Shiozaki A, Marunaka Y, Otsuji E. Roles of Ion and Water Channels in the Cell Death and Survival of Upper Gastrointestinal Tract Cancers. Front Cell Dev Biol 2021; 9:616933. [PMID: 33777930 PMCID: PMC7991738 DOI: 10.3389/fcell.2021.616933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 02/22/2021] [Indexed: 02/06/2023] Open
Abstract
Ion and water channels were recently shown to be involved in cancer cell functions, and various transporter types have been detected in upper gastrointestinal tract (UGI) cancers. Current information on the expression and roles of these channels and transporters in the death and survival of UGI cancer cells was reviewed herein, and the potential of their regulation for cancer management was investigated. Esophageal cancer (EC) and gastric cancer (GC) cells and tissues express many different types of ion channels, including voltage-gated K+, Cl-, and Ca2+, and transient receptor potential (TRP) channels, which regulate the progression of cancer. Aquaporin (AQP) 1, 3, and 5 are water channels that contribute to the progression of esophageal squamous cell carcinoma (ESCC) and GC. Intracellular pH regulators, including the anion exchanger (AE), sodium hydrogen exchanger (NHE), and vacuolar H+-ATPases (V-ATPase), also play roles in the functions of UGI cancer cells. We have previously conducted gene expression profiling and revealed that the regulatory mechanisms underlying apoptosis in ESCC cells involved various types of Cl- channels, Ca2+ channels, water channels, and pH regulators (Shimizu et al., 2014; Ariyoshi et al., 2017; Shiozaki et al., 2017, 2018a; Kobayashi et al., 2018; Yamazato et al., 2018; Konishi et al., 2019; Kudou et al., 2019; Katsurahara et al., 2020, 2021; Matsumoto et al., 2021; Mitsuda et al., 2021). We have also previously demonstrated the clinicopathological and prognostic significance of their expression in ESCC patients, and shown that their pharmacological blockage and gene silencing had an impact on carcinogenesis, indicating their potential as targets for the treatment of UGI cancers. A more detailed understanding of the molecular regulatory mechanisms underlying cell death and survival of UGI cancers may result in the application of cellular physiological methods as novel therapeutic approaches.
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Affiliation(s)
- Atsushi Shiozaki
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Yoshinori Marunaka
- Department of Molecular Cell Physiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.,Research Institute for Clinical Physiology, Kyoto Industrial Health Association, Kyoto, Japan.,Research Center for Drug Discovery and Pharmaceutical Development Science, Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Japan
| | - Eigo Otsuji
- Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kyoto, Japan
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14
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Ala M, Mohammad Jafari R, Hajiabbasi A, Dehpour AR. Aquaporins and diseases pathogenesis: From trivial to undeniable involvements, a disease-based point of view. J Cell Physiol 2021; 236:6115-6135. [PMID: 33559160 DOI: 10.1002/jcp.30318] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 01/01/2023]
Abstract
Aquaporins (AQPs), as transmembrane proteins, were primarily identified as water channels with the ability of regulating the transmission of water, glycerol, urea, and other small-sized molecules. The classic view of AQPs involvement in therapeutic plan restricted them and their regulators into managing only a narrow spectrum of the diseases such as diabetes insipidus and the syndrome of inappropriate ADH secretion. However, further investigations performed, especially in the third millennium, has found that their cooperation in water transmission control can be manipulated to handle other burden-imposing diseases such as cirrhosis, heart failure, Meniere's disease, cancer, bullous pemphigoid, eczema, and Sjögren's syndrome.
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Affiliation(s)
- Moein Ala
- Experimental Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.,Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Razieh Mohammad Jafari
- Experimental Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Asghar Hajiabbasi
- Guilan Rheumatology Research Center, Razi Hospital, Guilan University of Medical Sciences, Rasht, Iran
| | - Ahmad Reza Dehpour
- Experimental Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran.,Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.,Brain and Spinal Cord Injury Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran
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15
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Abstract
The movement of water across the cell membrane is a natural biological process that occurs during growth, cell division, and cell death. Many cells are known to regulate changes in their cell volume through inherent compensatory regulatory mechanisms. Cells can sense an increase or decrease in their cell volume, and compensate through mechanisms known as a regulatory volume increase (RVI) or decrease (RVD) response, respectively. The transport of sodium, potassium along with other ions and osmolytes allows the movement of water in and out of the cell. These compensatory volume regulatory mechanisms maintain a cell at near constant volume. A hallmark of the physiological cell death process known as apoptosis is the loss of cell volume or cell shrinkage. This loss of cell volume is in stark contrast to what occurs during the accidental cell death process known as necrosis. During necrosis, cells swell or gain water, eventually resulting in cell lysis. Thus, whether a cell gains or loses water after injury is a defining feature of the specific mode of cell death. Cell shrinkage or the loss of cell volume during apoptosis has been termed apoptotic volume decrease or AVD. Over the years, this distinguishing feature of apoptosis has been largely ignored and thought to be a passive occurrence or simply a consequence of the cell death process. However, studies on AVD have defined an underlying movement of ions that result in not only the loss of cell volume, but also the activation and execution of the apoptotic process. This review explores the role ions play in controlling not only the movement of water, but the regulation of apoptosis. We will focus on what is known about specific ion channels and transporters identified to be involved in AVD, and how the movement of ions and water change the intracellular environment leading to stages of cell shrinkage and associated apoptotic characteristics. Finally, we will discuss these concepts as they apply to different cell types such as neurons, cardiomyocytes, and corneal epithelial cells.
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Affiliation(s)
- Carl D Bortner
- Signal Transduction Laboratory, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, United States
| | - John A Cidlowski
- Signal Transduction Laboratory, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, United States
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16
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Chong-Canto S, García-Báez EV, Martínez-Martínez FJ, Ramos-Organillo AA, Padilla-Martínez II. Mechanochemical Synthesis and Structure of the Tetrahydrate and Mesoporous Anhydrous Metforminium(2+)- N, N'-1,4-Phenylenedioxalamic Acid (1:2) Salt: The Role of Hydrogen Bonding and n→π * Charge Assisted Interactions. Pharmaceutics 2020; 12:E998. [PMID: 33096739 PMCID: PMC7594043 DOI: 10.3390/pharmaceutics12100998] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/13/2020] [Accepted: 10/18/2020] [Indexed: 11/20/2022] Open
Abstract
A new organic salt of metformin, an antidiabetic drug, and N,N'-(1,4-phenylene)dioxalamic acid, was mechanochemically synthesized, purified by crystallization from solution and characterized by single X-ray crystallography. The structure revealed a salt-type crystal hydrate composed of one dicationic metformin unit, two monoanionic units of the acid and four water molecules, namely H2Mf(HpOXA)2∙4H2O. X-ray powder, IR, 13C-CPMAS, thermal and BET adsorption-desorption analyses were performed to elucidate the structure of the molecular and supramolecular structure of the anhydrous microcrystalline mesoporous solid H2Mf(HpOXA)2. The results suggest that their structures, conformation and hydrogen bonding schemes are very similar. To the best of our knowledge, the selective formation of the monoanion HpOXA-, as well as its structure in the solid, is herein reported for the first time. Regular O(δ-)∙∙∙C(δ), O(δ-)∙∙∙N+ and bifacial O(δ-)∙∙∙C(δ)∙∙∙O(δ-) of n→π * charge-assisted interactions are herein described in H2MfA organic salts which could be responsible of the interactions of metformin in biologic systems. The results support the participation of n→π * charge-assisted interactions independently, and not just as a short contact imposed by the geometric constraint due to the hydrogen bonding patterns.
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Affiliation(s)
- Sayuri Chong-Canto
- Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional-UPIBI, Av. Acueducto s/n Barrio la Laguna Ticomán, Ciudad de México C.P. 07340, Mexico; (S.C.-C.); (E.V.G.-B.)
| | - Efrén V. García-Báez
- Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional-UPIBI, Av. Acueducto s/n Barrio la Laguna Ticomán, Ciudad de México C.P. 07340, Mexico; (S.C.-C.); (E.V.G.-B.)
| | - Francisco J. Martínez-Martínez
- Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera Colima-Coquimatlán, Coquimatlán C.P. 28400, Colima, Mexico; (F.J.M.-M.); (A.A.R.-O.)
| | - Angel A. Ramos-Organillo
- Facultad de Ciencias Químicas, Universidad de Colima, Km. 9 Carretera Colima-Coquimatlán, Coquimatlán C.P. 28400, Colima, Mexico; (F.J.M.-M.); (A.A.R.-O.)
| | - Itzia I. Padilla-Martínez
- Laboratorio de Química Supramolecular y Nanociencias, Instituto Politécnico Nacional-UPIBI, Av. Acueducto s/n Barrio la Laguna Ticomán, Ciudad de México C.P. 07340, Mexico; (S.C.-C.); (E.V.G.-B.)
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17
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Mortensen LA, Bistrup C, Jensen BL, Hinrichs GR. A mini-review of pharmacological strategies used to ameliorate polyuria associated with X-linked nephrogenic diabetes insipidus. Am J Physiol Renal Physiol 2020; 319:F746-F753. [PMID: 32924547 DOI: 10.1152/ajprenal.00339.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Nephrogenic diabetes insipidus (NDI) is characterized by renal resistance to the antidiuretic hormone arginine vasopressin (AVP), which leads to polyuria, plasma hyperosmolarity, polydipsia, and impaired quality of living. Inherited forms are caused by X-linked loss-of-function mutations in the gene encoding the vasopressin 2 receptor (V2R) or autosomal recessive/dominant mutations in the gene encoding aquaporin 2 (AQP2). A common acquired form is lithium-induced NDI. AVP facilitates reabsorption of water through increased abundance and insertion of AQP2 in the apical membrane of principal cells in the collecting ducts. In X-linked NDI, V2R is dysfunctional, which leads to impaired water reabsorption. These patients have functional AQP2, and thus the challenge is to achieve AQP2 membrane insertion independently of V2R. The current treatment is symptomatic and is based on distally acting diuretics (thiazide or amiloride) and cyclooxygenase inhibitors (indomethacin). This mini-review covers published data from trials in preclinical in vivo models and a few human intervention studies to improve NDI by more causal approaches. Promising effects on NDI in preclinical studies have been demonstrated by the use of pharmacological approaches with secretin, Wnt5a, protein kinase A agonist, fluconazole, prostaglandin E2 EP2 and EP4 agonists, statins, metformin, and soluble prorenin receptor agonists. In patients, only casuistic reports have evaluated the effect of statins, phosphodiesterase inhibitors (rolipram and sildenafil), and the guanylate cyclase stimulator riociguat without amelioration of symptoms. It is concluded that there is currently no established intervention that causally improves symptoms or quality of life in patients with NDI. There is a need to collaborate to improve study quality and conduct formal trials.
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Affiliation(s)
- Line A Mortensen
- Department of Nephrology, Odense University Hospital, Odense, Denmark.,Department of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Claus Bistrup
- Department of Nephrology, Odense University Hospital, Odense, Denmark.,Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Boye L Jensen
- Department of Molecular Medicine, University of Southern Denmark, Odense, Denmark
| | - Gitte R Hinrichs
- Department of Nephrology, Odense University Hospital, Odense, Denmark.,Department of Molecular Medicine, University of Southern Denmark, Odense, Denmark
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18
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Ikizler TA. Dialysis: learning dialysis through computation, experimentation, and implementation. Kidney Int 2020; 98:246-250. [PMID: 32709282 DOI: 10.1016/j.kint.2020.05.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 05/20/2020] [Accepted: 05/21/2020] [Indexed: 11/19/2022]
Affiliation(s)
- T Alp Ikizler
- Department of Medicine, Division of Nephrology and Hypertension, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
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19
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Laszczyk AM, Higashi AY, Patel SR, Johnson CN, Soofi A, Abraham S, Dressler GR. Pax2 and Pax8 Proteins Regulate Urea Transporters and Aquaporins to Control Urine Concentration in the Adult Kidney. J Am Soc Nephrol 2020; 31:1212-1225. [PMID: 32381599 PMCID: PMC7269349 DOI: 10.1681/asn.2019090962] [Citation(s) in RCA: 12] [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: 09/25/2019] [Accepted: 02/29/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND As the glomerular filtrate passes through the nephron and into the renal medulla, electrolytes, water, and urea are reabsorbed through the concerted actions of solute carrier channels and aquaporins at various positions along the nephron and in the outer and inner medulla. Proliferating stem cells expressing the nuclear transcription factor Pax2 give rise to renal epithelial cells. Pax2 expression ends once the epithelial cells differentiate into mature proximal and distal tubules, whereas expression of the related Pax8 protein continues. The collecting tubules and renal medulla are derived from Pax2-positive ureteric bud epithelia that continue to express Pax2 and Pax8 in adult kidneys. Despite the crucial role of Pax2 in renal development, functions for Pax2 or Pax8 in adult renal epithelia have not been established. METHODS To examine the roles of Pax2 and Pax8 in the adult mouse kidney, we deleted either Pax2, Pax8, or both genes in adult mice and examined the resulting phenotypes and changes in gene expression patterns. We also explored the mechanism of Pax8-mediated activation of potential target genes in inner medullary collecting duct cells. RESULTS Mice with induced deletions of both Pax2 and Pax8 exhibit severe polyuria that can be attributed to significant changes in the expression of solute carriers, such as the urea transporters encoded by Slc14a2, as well as aquaporins within the inner and outer medulla. Furthermore, Pax8 expression is induced by high-salt levels in collecting duct cells and activates the Slc14a2 gene by recruiting a histone methyltransferase complex to the promoter. CONCLUSIONS These data reveal novel functions for Pax proteins in adult renal epithelia that are essential for retaining water and concentrating urine.
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Affiliation(s)
- Ann M Laszczyk
- Department of Pathology, University of Michigan, Ann Arbor, Michigan
| | - Atsuko Y Higashi
- Department of Pathology, University of Michigan, Ann Arbor, Michigan
| | | | - Craig N Johnson
- Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, Michigan
| | - Abdul Soofi
- Department of Pathology, University of Michigan, Ann Arbor, Michigan
| | - Saji Abraham
- Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan
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20
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Chen J, Li Q, Wu P, Liu J, Wang D, Yuan X, Zheng R, Sun R, Li L. Cyclic γ-Peptides With Transmembrane Water Channel Properties. Front Chem 2020; 8:368. [PMID: 32426330 PMCID: PMC7205449 DOI: 10.3389/fchem.2020.00368] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 04/08/2020] [Indexed: 01/14/2023] Open
Abstract
Self-assembling peptides can be used to design new materials for medical and biological applications. Here we synthesized and characterized two novel cyclic γ-peptides (γ-CPs) with hydrophobic inner surfaces. The NMR and FT-IR studies confirmed that the CPs could self-assemble into parallel stacking structures via intermolecular H-bonds and π-π interactions. The morphologies of the self-assembly CPs showed bundles of nanotubes via transmission electron microscopy (TEM); these nanotubes form water channels to transport water across the lipid membrane. The properties of blocking the transport of protons like natural water channels showed that the hydrophobic inner surfaces are important in artificial transmembrane water channel designs. These studies also showed that water transport was a function of pore size and length of the assemblies.
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Affiliation(s)
- Jie Chen
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Qiang Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Pengchao Wu
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Juan Liu
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Dan Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Xiaohong Yuan
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Renlin Zheng
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Rongqin Sun
- School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Liangchun Li
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, China
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21
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Vukićević T, Hinze C, Baltzer S, Himmerkus N, Quintanova C, Zühlke K, Compton F, Ahlborn R, Dema A, Eichhorst J, Wiesner B, Bleich M, Schmidt-Ott KM, Klussmann E. Fluconazole Increases Osmotic Water Transport in Renal Collecting Duct through Effects on Aquaporin-2 Trafficking. J Am Soc Nephrol 2019; 30:795-810. [PMID: 30988011 DOI: 10.1681/asn.2018060668] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Accepted: 02/13/2019] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Arginine-vasopressin (AVP) binding to vasopressin V2 receptors promotes redistribution of the water channel aquaporin-2 (AQP2) from intracellular vesicles into the plasma membrane of renal collecting duct principal cells. This pathway fine-tunes renal water reabsorption and urinary concentration, and its perturbation is associated with diabetes insipidus. Previously, we identified the antimycotic drug fluconazole as a potential modulator of AQP2 localization. METHODS We assessed the influence of fluconazole on AQP2 localization in vitro and in vivo as well as the drug's effects on AQP2 phosphorylation and RhoA (a small GTPase, which under resting conditions, maintains F-actin to block AQP2-bearing vesicles from reaching the plasma membrane). We also tested fluconazole's effects on water flow across epithelia of isolated mouse collecting ducts and on urine output in mice treated with tolvaptan, a VR2 blocker that causes a nephrogenic diabetes insipidus-like excessive loss of hypotonic urine. RESULTS Fluconazole increased plasma membrane localization of AQP2 in principal cells independent of AVP. It also led to an increased AQP2 abundance associated with alterations in phosphorylation status and ubiquitination as well as inhibition of RhoA. In isolated mouse collecting ducts, fluconazole increased transepithelial water reabsorption. In mice, fluconazole increased collecting duct AQP2 plasma membrane localization and reduced urinary output. Fluconazole also reduced urinary output in tolvaptan-treated mice. CONCLUSIONS Fluconazole promotes collecting duct AQP2 plasma membrane localization in the absence of AVP. Therefore, it might have utility in treating forms of diabetes insipidus (e.g., X-linked nephrogenic diabetes insipidus) in which the kidney responds inappropriately to AVP.
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Affiliation(s)
- Tanja Vukićević
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany
| | - Christian Hinze
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany.,Department of Nephrology and Medical Intensive Care and.,Berlin Institute of Health, Berlin, Germany
| | - Sandrine Baltzer
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany
| | - Nina Himmerkus
- Institute of Physiology, Christian Albrechts University Kiel, Kiel, Germany
| | | | - Kerstin Zühlke
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany
| | - Friederike Compton
- Department of Nephrology and Medical Intensive Care and.,Berlin Institute of Health, Berlin, Germany
| | - Robert Ahlborn
- Information Technology Department, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Alessandro Dema
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany
| | - Jenny Eichhorst
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Cellular Imaging, Berlin, Germany
| | - Burkhard Wiesner
- Leibniz-Forschungsinstitut für Molekulare Pharmakologie (FMP), Cellular Imaging, Berlin, Germany
| | - Markus Bleich
- Institute of Physiology, Christian Albrechts University Kiel, Kiel, Germany
| | - Kai M Schmidt-Ott
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany; .,Department of Nephrology and Medical Intensive Care and.,Berlin Institute of Health, Berlin, Germany
| | - Enno Klussmann
- Max Delbrück Center for Molecular Medicine Berlin, (MDC), Research area Cardiovascular & Metabolic Disease, Berlin, Germany; .,German Centre for Cardiovascular Research (DZHK), Partner Site Berlin, Berlin, Germany; and.,Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Vegetative Physiology, Berlin, Germany
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22
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Jung HJ, Raghuram V, Lee JW, Knepper MA. Genome-Wide Mapping of DNA Accessibility and Binding Sites for CREB and C/EBP β in Vasopressin-Sensitive Collecting Duct Cells. J Am Soc Nephrol 2018; 29:1490-1500. [PMID: 29572403 DOI: 10.1681/asn.2017050545] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 02/18/2018] [Indexed: 11/03/2022] Open
Abstract
Background Renal water excretion is controlled by vasopressin, in part through regulation of the transcription of the aquaporin-2 gene (Aqp2).Methods To identify enhancer regions likely to be involved in the regulation of Aqp2 and other principal cell-specific genes, we used several next generation DNA-sequencing techniques in a well characterized cultured cell model of collecting duct principal cells (mpkCCD). To locate enhancers, we performed the assay for transposase-accessible chromatin using sequencing (ATAC-Seq) to identify accessible regions of DNA and integrated the data with data generated by chromatin immunoprecipitation followed by next generation DNA-sequencing (ChIP-Seq) for CCCTC binding factor (CTCF) binding, histone H3 lysine-27 acetylation, and RNA polymerase II.Results We identified two high-probability enhancers centered 81 kb upstream and 5.8 kb downstream from the Aqp2 transcriptional start site. Motif analysis of these regions and the Aqp2 promoter identified several potential transcription factor binding sites, including sites for two b-ZIP transcription factors: CCAAT/enhancer binding protein-β (C/EBPβ) and cAMP-responsive element binding protein (CREB). To identify genomic binding sites for both, we conducted ChIP-Seq using well characterized antibodies. In the presence of vasopressin, C/EBPβ, a pioneer transcription factor critical to cell-specific gene expression, bound strongly at the identified enhancer downstream from Aqp2 However, over multiple replicates, we found no detectable CREB binding sites within 390 kb of Aqp2 Thus, any role for CREB in the regulation of Aqp2 gene transcription is likely to be indirect.Conclusions The analysis identified two enhancer regions pertinent to transcriptional regulation of the Aqp2 gene and showed C/EBPβ (but not CREB) binding.
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Affiliation(s)
- Hyun Jun Jung
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland; and
| | - Viswanathan Raghuram
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland; and
| | - Jae Wook Lee
- National Cancer Center, Goyang, Gyeonggi-do, Republic of Korea
| | - Mark A Knepper
- Epithelial Systems Biology Laboratory, Systems Biology Center, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland; and
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Patil RS, Zhang C, Sikligar K, Baker GA, Atwood JL. Formation of Water Channels in the Crystalline Hydrates of Macrocyclic Compounds. Chemistry 2018; 24:3299-3304. [PMID: 29291258 DOI: 10.1002/chem.201705609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Indexed: 12/20/2022]
Abstract
Crystalline hydrates of macrocyclic compounds such as pyroagllol[4]arenes (PgCs) and resorcin[4]arenes (RsCs) are rare owing to their lower water solubility. Functionalization of these macrocyclic compounds is an affordable way to enhance water solubility. However, functionalization also encounters the formation of multiple conformers and subsequent difficulty in purification of the product. Herein, four novel crystalline hydrates of functionalized PgCs and RsCs were synthesized. Formation of water channels and the effects of intermolecular interactions on the physical properties of these novel hydrates are discussed.
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Affiliation(s)
- Rahul S Patil
- Department of Chemistry, University of Missouri, 601 S. College Ave., Columbia, MO, 65211, USA
| | - Chen Zhang
- Department of Chemistry, University of Missouri, 601 S. College Ave., Columbia, MO, 65211, USA
| | - Kanishka Sikligar
- Department of Chemistry, University of Missouri, 601 S. College Ave., Columbia, MO, 65211, USA
| | - Gary A Baker
- Department of Chemistry, University of Missouri, 601 S. College Ave., Columbia, MO, 65211, USA
| | - Jerry L Atwood
- Department of Chemistry, University of Missouri, 601 S. College Ave., Columbia, MO, 65211, USA
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24
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Sheng J, Zhu Q, Zeng X, Yang Z, Zhang X. Promotion of Water Channels for Enhanced Ion Transport in 14 nm Diameter Carbon Nanotubes. ACS Appl Mater Interfaces 2017; 9:11009-11015. [PMID: 28264153 DOI: 10.1021/acsami.7b00174] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Ion transport plays an important role in solar-to-electricity conversion, drug delivery, and a variety of biological processes. Carbon nanotube (CNT) is a promising material as an ion transporter in the applications of the mimicking of natural ion channels, desalination, and energy harvesting. Here, we demonstrate a unique, enhanced ion transport through a vertically aligned multiwall CNT membrane after the application of an electric potential across CNT membranes. Interestingly, electrowetting arising from the application of an electric potential is critical for the enhancement of overall ion transport rate through CNT membranes. The wettability of a liquid with high surface tension on the interior channel walls of CNTs increases during an electric potential treatment and promotes the formation of water channels in CNTs. The formation of water channels in CNTs induces an increase in overall ion diffusion through CNT membranes. This phenomenon is also related to a decrease in the charge transfer resistance of CNTs (Rct) after an electric potential is applied. Correspondingly, the enhanced ion flow rate gives rise to an enhancement in the capacitive performance of CNT based membranes. Our observations might have profound impact on the development of CNT based energy storage devices as well as artificial ion channels.
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Affiliation(s)
| | | | | | - Zhaohui Yang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University , Tianjin 300387, China
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25
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Cheung PW, Nomura N, Nair AV, Pathomthongtaweechai N, Ueberdiek L, Lu HAJ, Brown D, Bouley R. EGF Receptor Inhibition by Erlotinib Increases Aquaporin 2-Mediated Renal Water Reabsorption. J Am Soc Nephrol 2016; 27:3105-3116. [PMID: 27694161 PMCID: PMC5042667 DOI: 10.1681/asn.2015080903] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [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: 08/17/2015] [Accepted: 01/28/2016] [Indexed: 01/04/2023] Open
Abstract
Nephrogenic diabetes insipidus (NDI) is caused by impairment of vasopressin (VP) receptor type 2 signaling. Because potential therapies for NDI that target the canonical VP/cAMP/protein kinase A pathway have so far proven ineffective, alternative strategies for modulating aquaporin 2 (AQP2) trafficking have been sought. Successful identification of compounds by our high-throughput chemical screening assay prompted us to determine whether EGF receptor (EGFR) inhibitors stimulate AQP2 trafficking and reduce urine output. Erlotinib, a selective EGFR inhibitor, enhanced AQP2 apical membrane expression in collecting duct principal cells and reduced urine volume by 45% after 5 days of treatment in mice with lithium-induced NDI. Similar to VP, erlotinib increased exocytosis and decreased endocytosis in LLC-PK1 cells, resulting in a significant increase in AQP2 membrane accumulation. Erlotinib increased phosphorylation of AQP2 at Ser-256 and Ser-269 and decreased phosphorylation at Ser-261 in a dose-dependent manner. However, unlike VP, the effect of erlotinib was independent of cAMP, cGMP, and protein kinase A. Conversely, EGF reduced VP-induced AQP2 Ser-256 phosphorylation, suggesting crosstalk between VP and EGF in AQP2 trafficking and a role of EGF in water homeostasis. These results reveal a novel pathway that contributes to the regulation of AQP2-mediated water reabsorption and suggest new potential therapeutic strategies for NDI treatment.
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Affiliation(s)
- Pui W Cheung
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Naohiro Nomura
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Anil V Nair
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Nutthapoom Pathomthongtaweechai
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Lars Ueberdiek
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Hua A Jenny Lu
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Dennis Brown
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Richard Bouley
- Center for Systems Biology, Program in Membrane Biology, Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
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26
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Amann B, Kleinwort KJH, Hirmer S, Sekundo W, Kremmer E, Hauck SM, Deeg CA. Expression and Distribution Pattern of Aquaporin 4, 5 and 11 in Retinas of 15 Different Species. Int J Mol Sci 2016; 17:ijms17071145. [PMID: 27438827 PMCID: PMC4964518 DOI: 10.3390/ijms17071145] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 04/25/2016] [Accepted: 07/12/2016] [Indexed: 12/28/2022] Open
Abstract
Aquaporins (AQPs) are small integral membrane proteins with 13 members in mammals and are essential for water transport across membranes. They are found in many different tissues and cells. Currently, there are conflicting results regarding retinal aquaporin expression and subcellular localization between genome and protein analyses and among various species. AQP4, 7, 9 and 11 were described in the retina of men; whereas AQP6, 8 and 10 were earlier identified in rat retinas and AQP4, 5 and 11 in horses. Since there is a lack of knowledge regarding AQP expression on protein level in retinas of different animal models, we decided to analyze retinal cellular expression of AQP4, 5 and 11 in situ with immunohistochemistry. AQP4 was detected in all 15 explored species, AQP5 and AQP11 in 14 out of 15. Interestingly, AQP4 was unambiguously expressed in Muller glial cells, whereas AQP5 was differentially allocated among the species analyzed. AQP11 expression was Muller glial cell-specific in 50% of the animals, whereas in the others, AQP11 was detected in ganglion cell layer and at photoreceptor outer segments. Our data indicate a disparity in aquaporin distribution in retinas of various animals, especially for AQP5 and 11.
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Affiliation(s)
- Barbara Amann
- Institute for Animal Physiology, Department of Veterinary Sciences, Ludwig-Maximilians-University, Veterinärstraße 13, D-80539 Munich, Germany.
| | - Kristina J H Kleinwort
- Institute for Animal Physiology, Department of Veterinary Sciences, Ludwig-Maximilians-University, Veterinärstraße 13, D-80539 Munich, Germany.
| | - Sieglinde Hirmer
- Institute for Animal Physiology, Department of Veterinary Sciences, Ludwig-Maximilians-University, Veterinärstraße 13, D-80539 Munich, Germany.
| | - Walter Sekundo
- Clinic for Ophthalmology, University Clinic Gießen und Marburg GmbH, Marburg, Baldingerstrasse, D-35033 Marburg, Germany.
| | - Elisabeth Kremmer
- Institute of Molecular Immunology, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH), Marchioninistraße 25, D-81377 München, Germany.
| | - Stefanie M Hauck
- Research Unit Protein Science, Helmholtz Zentrum München, German Research Center for Environmental Health GmbH, Heidemannstr. 1, D-80939 München, Germany.
| | - Cornelia A Deeg
- Institute for Animal Physiology, Department of Veterinary Sciences, Ludwig-Maximilians-University, Veterinärstraße 13, D-80539 Munich, Germany.
- Experimental Ophthalmology, Philipps University of Marburg, Baldingerstrasse, D-35033 Marburg, Germany.
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27
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Sun Y, Zhang Y, Zhu Y, Zhang A, Huang S, Yin X, Ding G, Liu M, Jia Z. Inhibition of mitochondrial complex-1 restores the downregulation of aquaporins in obstructive nephropathy. Am J Physiol Renal Physiol 2016; 311:F777-F786. [PMID: 27413198 DOI: 10.1152/ajprenal.00215.2015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 07/05/2016] [Indexed: 01/12/2023] Open
Abstract
Obstructive kidney disease is a common complication in the clinic. Downregulation of aquaporins (AQPs) in obstructed kidneys has been thought as a key factor leading to the polyuria and impairment of urine-concentrating capability after the release of kidney obstruction. The present study was to investigate the role of mitochondrial complex-1 in modulating AQPs in obstructive nephropathy. Following 7-day unilateral ureteral obstruction (UUO), AQP1, AQP2, AQP3, and vasopressin 2 (V2) receptor were remarkably reduced as determined by qRT-PCR and/or Western blotting. Notably, inhibition of mitochondrial complex-1 by rotenone markedly reversed the downregulation of AQP1, AQP2, AQP3, and V2 In contrast, AQP4 was not affected by kidney obstruction or rotenone treatment. In a separate study, rotenone also attenuated AQPs' downregulation after 48-h UUO. To study the potential mechanisms in mediating the rotenone effects on AQPs, we examined the regulation of the COX-2/microsomal prostaglandin E synthase (mPGES)-1/PGE2/EP pathway and found that COX-2, mPGES-1, and renal PGE2 content were all significantly elevated in obstructive kidneys, which was not affected by rotenone treatment. For EP receptors, EP2 and EP4 but not EP1 and EP3 were upregulated in obstructive kidneys. Importantly, rotenone strikingly suppressed EP1 and EP4 but not EP2 and EP3 receptors. However, treatment of EP1 antagonist SC-51322 could not affect AQPs' reduction in obstructed kidneys. Collectively, these findings suggested an important role of mitochondrial dysfunction in modulating AQPs and V2 receptor in obstructive nephropathy possibly via prostaglandin-independent mechanisms.
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Affiliation(s)
- Ying Sun
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Department of Pharmacy, Xuzhou Medical University, Xuzhou, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Yue Zhang
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Yangyang Zhu
- Department of Pharmacy, Xuzhou Medical University, Xuzhou, China
| | - Aihua Zhang
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Songming Huang
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Xiaoxin Yin
- Department of Pharmacy, Xuzhou Medical University, Xuzhou, China
| | - Guixia Ding
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Mi Liu
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
| | - Zhanjun Jia
- Department of Nephrology, Nanjing Children's Hospital, Affiliated to Nanjing Medical University, Nanjing, China; Nanjing Key Laboratory of Pediatric, Nanjing Children Hospital, Affiliated to Nanjing Medical University, Nanjing, China; and Institute of Pediatrics, Nanjing Medical University, Nanjing, China
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28
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Yuan S, Peng Q, Palczewski K, Vogel H, Filipek S. Mechanistic Studies on the Stereoselectivity of the Serotonin 5-HT1A Receptor. Angew Chem Int Ed Engl 2016; 55:8661-5. [PMID: 27244650 PMCID: PMC4957245 DOI: 10.1002/anie.201603766] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Indexed: 01/03/2023]
Abstract
G‐protein‐coupled receptors (GPCRs) are involved in a wide range of physiological processes, and they have attracted considerable attention as important targets for developing new medicines. A central and largely unresolved question in drug discovery, which is especially relevant to GPCRs, concerns ligand selectivity: Why do certain molecules act as activators (agonists) whereas others, with nearly identical structures, act as blockers (antagonists) of GPCRs? To address this question, we employed all‐atom, long‐timescale molecular dynamics simulations to investigate how two diastereomers (epimers) of dihydrofuroaporphine bind to the serotonin 5‐HT1A receptor and exert opposite effects. By using molecular interaction fingerprints, we discovered that the agonist could mobilize nearby amino acid residues to act as molecular switches for the formation of a continuous water channel. In contrast, the antagonist epimer remained firmly stabilized in the binding pocket.
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Affiliation(s)
- Shuguang Yuan
- Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
| | - Qian Peng
- Department of Chemistry, University of Oxford, UK
| | - Krzysztof Palczewski
- Department of Pharmacology, School of Medicine, Case Western Reserve University, Cleveland, USA
| | - Horst Vogel
- Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
| | - Slawomir Filipek
- Laboratory of Biomodeling, Faculty of Chemistry & Biological and Chemical Research Centre, University of Warsaw, Warsaw, Poland.
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29
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Kishore BK, Carlson NG, Ecelbarger CM, Kohan DE, Müller CE, Nelson RD, Peti-Peterdi J, Zhang Y. Targeting renal purinergic signalling for the treatment of lithium-induced nephrogenic diabetes insipidus. Acta Physiol (Oxf) 2015; 214:176-88. [PMID: 25877068 PMCID: PMC4430398 DOI: 10.1111/apha.12507] [Citation(s) in RCA: 27] [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: 02/03/2015] [Accepted: 04/08/2015] [Indexed: 12/26/2022]
Abstract
Lithium still retains its critical position in the treatment of bipolar disorder by virtue of its ability to prevent suicidal tendencies. However, chronic use of lithium is often limited by the development of nephrogenic diabetes insipidus (NDI), a debilitating condition. Lithium-induced NDI is due to resistance of the kidney to arginine vasopressin (AVP), leading to polyuria, natriuresis and kaliuresis. Purinergic signalling mediated by extracellular nucleotides (ATP/UTP), acting via P2Y receptors, opposes the action of AVP on renal collecting duct (CD) by decreasing the cellular cAMP and thus AQP2 protein levels. Taking a cue from this phenomenon, we discovered the potential involvement of ATP/UTP-activated P2Y2 receptor in lithium-induced NDI in rats and showed that P2Y2 receptor knockout mice are significantly resistant to Li-induced polyuria, natriuresis and kaliuresis. Extension of these studies revealed that ADP-activated P2Y12 receptor is expressed in the kidney, and its irreversible blockade by the administration of clopidogrel bisulphate (Plavix(®)) ameliorates Li-induced NDI in rodents. Parallel in vitro studies showed that P2Y12 receptor blockade by the reversible antagonist PSB-0739 sensitizes CD to the action of AVP. Thus, our studies unravelled the potential beneficial effects of targeting P2Y2 or P2Y12 receptors to counter AVP resistance in lithium-induced NDI. If established in further studies, our findings may pave the way for the development of better and safer methods for the treatment of NDI by bringing a paradigm shift in the approach from the current therapies that predominantly counter the anti-AVP effects to those that enhance the sensitivity of the kidney to AVP action.
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Affiliation(s)
- B. K. Kishore
- Department of Internal Medicine, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
- Nephrology Research, Department of Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah, USA
- Center on Aging, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
| | - N. G. Carlson
- Center on Aging, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
- Department of Neurobiology and Anatomy, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
- Geriatric Research, Education and Clinical Center, Department of Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah, USA
| | - C. M. Ecelbarger
- Department of Medicine, Georgetown University, Washington, District of Columbia, USA
- Center for the Study of Sex Differences in Health, Aging, and Disease, Georgetown University, Washington, District of Columbia, USA
| | - D. E. Kohan
- Department of Internal Medicine, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
- Nephrology Research, Department of Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah, USA
| | - C. E. Müller
- PharmaCenter Bonn, Pharmaceutical Institute, Pharmaceutical Chemistry I, University of Bonn, Bonn, Germany
| | - R. D. Nelson
- Department of Paediatrics, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
| | - J. Peti-Peterdi
- Department of Physiology and Biophysics, and Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, California, USA
| | - Y. Zhang
- Department of Internal Medicine, University of Utah Health Sciences Center, Salt Lake City, Utah, USA
- Nephrology Research, Department of Veterans Affairs Salt Lake City Health Care System, Salt Lake City, Utah, USA
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30
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Morelle J, Sow A, Hautem N, Bouzin C, Crott R, Devuyst O, Goffin E. Interstitial Fibrosis Restricts Osmotic Water Transport in Encapsulating Peritoneal Sclerosis. J Am Soc Nephrol 2015; 26:2521-33. [PMID: 25636412 DOI: 10.1681/asn.2014090939] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2014] [Accepted: 12/24/2014] [Indexed: 12/27/2022] Open
Abstract
Encapsulating peritoneal sclerosis (EPS) is a rare but severe complication of peritoneal dialysis (PD) characterized by extensive fibrosis of the peritoneum. Changes in peritoneal water transport may precede EPS, but the mechanisms and potential predictive value of that transport defect are unknown. Among 234 patients with ESRD who initiated PD at our institution over a 20-year period, 7 subsequently developed EPS. We evaluated changes in peritoneal transport over time on PD in these 7 patients and in 28 matched controls using 3.86% glucose peritoneal equilibration tests. Compared with long-term PD controls, patients with EPS showed early loss of ultrafiltration capacity and sodium sieving before the onset of overt EPS. Multivariate analysis revealed that loss of sodium sieving was the most powerful predictor of EPS. Compared with long-term PD control and uremic peritoneum, EPS peritoneum showed thicker submesothelial fibrosis, with increased collagen density and a greater amount of thick collagen fibers. Reduced osmotic conductance strongly correlated with the degree of peritoneal fibrosis, but not with vasculopathy. Peritoneal fibrosis was paralleled by an excessive upregulation of vascular endothelial growth factor and endothelial nitric oxide synthase, but the expression of endothelial aquaporin-1 water channels was unaltered. Our findings suggest that an early and disproportionate reduction in osmotic conductance during the course of PD is an independent predictor of EPS. This functional change is linked to specific alterations of the collagen matrix in the peritoneal membrane of patients with EPS, thereby validating the serial three-pore membrane/fiber matrix and distributed models of peritoneal transport.
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Affiliation(s)
- Johann Morelle
- Division and Laboratory of Nephrology, Cliniques Universitaires Saint-Luc, Institute of Experimental and Clinical Research, Université Catholique de Louvain Medical School
| | - Amadou Sow
- Division and Laboratory of Nephrology, Cliniques Universitaires Saint-Luc, Institute of Experimental and Clinical Research, Université Catholique de Louvain Medical School
| | - Nicolas Hautem
- Division and Laboratory of Nephrology, Cliniques Universitaires Saint-Luc, Institute of Experimental and Clinical Research, Université Catholique de Louvain Medical School
| | - Caroline Bouzin
- Imaging Platform, Institute of Experimental and Clinical Research, and
| | - Ralph Crott
- School of Public Health, Université Catholique de Louvain Medical School, Brussels, Belgium; and
| | - Olivier Devuyst
- Division and Laboratory of Nephrology, Cliniques Universitaires Saint-Luc, Institute of Experimental and Clinical Research, Université Catholique de Louvain Medical School Institute of Physiology, Zurich Center for Integrative Human Physiology, University of Zurich, Zurich, Switzerland
| | - Eric Goffin
- Division and Laboratory of Nephrology, Cliniques Universitaires Saint-Luc, Institute of Experimental and Clinical Research, Université Catholique de Louvain Medical School
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31
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Bonfrate L, Procino G, Wang DQH, Svelto M, Portincasa P. A novel therapeutic effect of statins on nephrogenic diabetes insipidus. J Cell Mol Med 2015; 19:265-82. [PMID: 25594563 PMCID: PMC4407600 DOI: 10.1111/jcmm.12422] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2014] [Accepted: 08/01/2014] [Indexed: 12/12/2022] Open
Abstract
Statins competitively inhibit hepatic 3-hydroxy-3-methylglutaryl-coenzyme A reductase, resulting in reduced plasma total and low-density lipoprotein cholesterol levels. Recently, it has been shown that statins exert additional ‘pleiotropic’ effects by increasing expression levels of the membrane water channels aquaporin 2 (AQP2). AQP2 is localized mainly in the kidney and plays a critical role in determining cellular water content. This additional effect is independent of cholesterol homoeostasis, and depends on depletion of mevalonate-derived intermediates of sterol synthetic pathways, i.e. farnesylpyrophosphate and geranylgeranylpyrophosphate. By up-regulating the expression levels of AQP2, statins increase water reabsorption by the kidney, thus opening up a new avenue in treating patients with nephrogenic diabetes insipidus (NDI), a hereditary disease that yet lacks high-powered and limited side effects therapy. Aspects related to water balance determined by AQP2 in the kidney, as well as standard and novel therapeutic strategies of NDI are discussed.
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Affiliation(s)
- Leonilde Bonfrate
- Department of Biomedical Sciences and Human Oncology, Internal Medicine, University Medical School, Bari, Italy
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Pohl M, Shan Q, Petsch T, Styp-Rekowska B, Matthey P, Bleich M, Bachmann S, Theilig F. Short-term functional adaptation of aquaporin-1 surface expression in the proximal tubule, a component of glomerulotubular balance. J Am Soc Nephrol 2014; 26:1269-78. [PMID: 25270072 DOI: 10.1681/asn.2014020148] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 07/22/2014] [Indexed: 11/03/2022] Open
Abstract
Transepithelial water flow across the renal proximal tubule is mediated predominantly by aquaporin-1 (AQP1). Along this nephron segment, luminal delivery and transepithelial reabsorption are directly coupled, a phenomenon called glomerulotubular balance. We hypothesized that the surface expression of AQP1 is regulated by fluid shear stress, contributing to this effect. Consistent with this finding, we found that the abundance of AQP1 in brush border apical and basolateral membranes was augmented >2-fold by increasing luminal perfusion rates in isolated, microperfused proximal tubules for 15 minutes. Mouse kidneys with diminished endocytosis caused by a conditional deletion of megalin or the chloride channel ClC-5 had constitutively enhanced AQP1 abundance in the proximal tubule brush border membrane. In AQP1-transfected, cultured proximal tubule cells, fluid shear stress or the addition of cyclic nucleotides enhanced AQP1 surface expression and concomitantly diminished its ubiquitination. These effects were also associated with an elevated osmotic water permeability. In sum, we have shown that luminal surface expression of AQP1 in the proximal tubule brush border membrane is regulated in response to flow. Cellular trafficking, endocytosis, an intact endosomal compartment, and controlled protein stability are the likely prerequisites for AQP1 activation by enhanced tubular fluid shear stress, serving to maintain glomerulotubular balance.
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Affiliation(s)
- Marcus Pohl
- Institute of Anatomy, Charité Universitätsmedizin, Berlin, Germany
| | - Qixian Shan
- Institute of Physiology, Kiel University, Kiel, Germany
| | - Thomas Petsch
- Institute of Anatomy, Charité Universitätsmedizin, Berlin, Germany
| | | | - Patricia Matthey
- Institute of Anatomy, Department of Medicine, University of Fribourg, Fribourg, Switzerland
| | - Markus Bleich
- Institute of Physiology, Kiel University, Kiel, Germany
| | | | - Franziska Theilig
- Institute of Anatomy, Charité Universitätsmedizin, Berlin, Germany; Institute of Anatomy, Department of Medicine, University of Fribourg, Fribourg, Switzerland
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Nomura N, Nunes P, Bouley R, Nair AV, Shaw S, Ueda E, Pathomthongtaweechai N, Lu HAJ, Brown D. High-throughput chemical screening identifies AG-490 as a stimulator of aquaporin 2 membrane expression and urine concentration. Am J Physiol Cell Physiol 2014; 307:C597-605. [PMID: 24944200 DOI: 10.1152/ajpcell.00154.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A reduction or loss of plasma membrane aquaporin 2 (AQP2) in kidney principal cells due to defective vasopressin (VP) signaling through the VP receptor causes excessive urine production, i.e., diabetes insipidus. The amount of AQP2 on the plasma membrane is regulated by a balance of exocytosis and endocytosis and is the rate limiting step for water reabsorption in the collecting duct. We describe here a systematic approach using high-throughput screening (HTS) followed by in vitro and in vivo assays to discover novel compounds that enhance vasopressin-independent AQP2 membrane expression. We performed initial chemical library screening with a high-throughput exocytosis fluorescence assay using LLC-PK1 cells expressing soluble secreted yellow fluorescent protein and AQP2. Thirty-six candidate exocytosis enhancers were identified. These compounds were then rescreened in AQP2-expressing cells to determine their ability to increase AQP2 membrane accumulation. Effective drugs were then applied to kidney slices in vitro. Three compounds, AG-490, β-lapachone, and HA14-1 increased AQP2 membrane accumulation in LLC-PK1 cells, and both AG-490 and β-lapachone were also effective in MDCK cells and principal cells in rat kidney slices. Finally, one compound, AG-490 (an EGF receptor and JAK-2 kinase inhibitor), decreased urine volume and increased urine osmolality significantly in the first 2-4 h after a single injection into VP-deficient Brattleboro rats. In conclusion, we have developed a systematic procedure for identifying new compounds that modulate AQP2 trafficking using initial HTS followed by in vitro assays in cells and kidney slices, and concluding with in vivo testing in an animal model.
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Affiliation(s)
- Naohiro Nomura
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Paula Nunes
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Richard Bouley
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Anil V Nair
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Stanley Shaw
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and
| | - Erica Ueda
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and
| | - Nutthapoom Pathomthongtaweechai
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Hua A Jenny Lu
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Dennis Brown
- Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts; and Program in Membrane Biology and Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
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Abstract
Urine concentrating ability is reduced during normal aging in people and rats. The abundance of many of the key transport proteins that contribute to urine concentrating ability is reduced in the kidney medulla of aged rats. The reductions in water, sodium, and urea transport protein abundances, and their reduced response to water restriction, contribute to the reduced ability of aged rats to concentrate their urine and conserve water. If similar mechanisms occur in human kidneys, it would provide a molecular explanation for the reduced urine concentrating ability in aging and may provide opportunities for novel therapeutic approaches to improve urine concentrating ability and/or nocturnal polyuria.
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Affiliation(s)
- Jeff M Sands
- Renal Division, Department of Medicine, Emory University School of Medicine, WMRB Room 338, NE, 1639 Pierce Drive, Atlanta, GA 30322, USA.
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Anderberg HI, Kjellbom P, Johanson U. Annotation of Selaginella moellendorffii Major Intrinsic Proteins and the Evolution of the Protein Family in Terrestrial Plants. Front Plant Sci 2012; 3:33. [PMID: 22639644 PMCID: PMC3355642 DOI: 10.3389/fpls.2012.00033] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2011] [Accepted: 02/01/2012] [Indexed: 05/18/2023]
Abstract
Major intrinsic proteins (MIPs) also called aquaporins form pores in membranes to facilitate the permeation of water and certain small polar solutes across membranes. MIPs are present in virtually every organism but are uniquely abundant in land plants. To elucidate the evolution and function of MIPs in terrestrial plants, the MIPs encoded in the genome of the spikemoss Selaginella moellendorffii were identified and analyzed. In total 19 MIPs were found in S. moellendorffii belonging to 6 of the 7 MIP subfamilies previously identified in the moss Physcomitrella patens. Only three of the MIPs were classified as members of the conserved water specific plasma membrane intrinsic protein (PIP) subfamily whereas almost half were found to belong to the diverse NOD26-like intrinsic protein (NIP) subfamily permeating various solutes. The small number of PIPs in S. moellendorffii is striking compared to all other land plants and no other species has more NIPs than PIPs. Similar to moss, S. moellendorffii only has one type of tonoplast intrinsic protein (TIP). Based on ESTs from non-angiosperms we conclude that the specialized groups of TIPs present in higher plants are not found in primitive vascular plants but evolved later in a common ancestor of seed plants. We also note that the silicic acid permeable NIP2 group that has been reported from angiosperms appears at the same time. We suggest that the expansion of the number MIP isoforms in higher plants is primarily associated with an increase in the different types of specialized tissues rather than the emergence of vascular tissue per se and that the loss of subfamilies has been possible due to a functional overlap between some subfamilies.
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Affiliation(s)
- Hanna I. Anderberg
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Center for Chemistry and Chemical Engineering, Lund UniversityLund, Sweden
| | - Per Kjellbom
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Center for Chemistry and Chemical Engineering, Lund UniversityLund, Sweden
| | - Urban Johanson
- Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Center for Chemistry and Chemical Engineering, Lund UniversityLund, Sweden
- *Correspondence: Urban Johanson, Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Center for Chemistry and Chemical Engineering, Lund University, PO Box 124, S-221 00 Lund, Sweden. e-mail:
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Wamae PM, Githeko AK, Menya DM, Takken W. Shading by napier grass reduces malaria vector larvae in natural habitats in Western Kenya highlands. Ecohealth 2010; 7:485-497. [PMID: 20602147 PMCID: PMC3166610 DOI: 10.1007/s10393-010-0321-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 02/12/2010] [Accepted: 05/12/2010] [Indexed: 05/29/2023]
Abstract
Increased human population in the Western Kenya highlands has led to reclamation of natural swamps resulting in the creation of habitats suitable for the breeding of Anopheles gambiae, the major malaria vector in the region. Here we report on a study to restore the reclaimed swamp and reverse its suitability as a habitat for malaria vectors. Napier grass-shaded and non-shaded water channels in reclaimed sites in Western Kenya highlands were studied for the presence and density of mosquito larvae, mosquito species composition, and daily variation in water temperature. Shading was associated with 75.5% and 88.4% (P < 0.0001) reduction in anopheline larvae densities and 78.1% and 88% (P < 0.0001) reduction in Anopheles gambiae sensu lato (s.l.) densities in two sites, respectively. Shading was associated with a 5.7°C, 5.0°C, and 4.7°C, and 1.6°C, 3.9°C, and 2.8°C (for maximum, minimum, and average temperatures, respectively) reduction (P < 0.0001) in water temperatures in the two locations, respectively. An. gambiae s.l. was the dominant species, constituting 83.2% and 73.1%, and 44.5% and 42.3%, of anophelines in non-shaded and shaded channels, respectively, in the two sites, respectively. An. gambiae sensu stricto (s.s.) constituted the majority (97.4%) of An. gambiae s.l., while the rest (2.6%) comprised of Anopheles arabiensis. Minimum water temperature decreased with increasing grass height (P = 0.0039 and P = 0.0415 for Lunyerere and Emutete sites, respectively). The results demonstrate how simple environmental strategies can have a strong impact on vector densities.
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Affiliation(s)
- Peter M. Wamae
- Climate and Human Health Research Unit, Centre for Global Health Research, Kenya Medical Research Institute (KEMRI), P. O. Box 1578-40100, Kisumu, Kenya
| | - Andrew K. Githeko
- Climate and Human Health Research Unit, Centre for Global Health Research, Kenya Medical Research Institute (KEMRI), P. O. Box 1578-40100, Kisumu, Kenya
| | - Diana M. Menya
- Department of Epidemiology and Nutrition, School of Public Health, Moi University, P. O. Box 4606, Eldoret, Kenya
| | - Willem Takken
- Laboratory of Entomology, Wageningen University and Research Centre, P. O. Box 8031, 6700 EH Wageningen, The Netherlands
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Yeung CH. Aquaporins in spermatozoa and testicular germ cells: identification and potential role. Asian J Androl 2010; 12:490-9. [PMID: 20562895 PMCID: PMC3739372 DOI: 10.1038/aja.2010.40] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [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: 04/19/2010] [Revised: 05/05/2010] [Accepted: 05/10/2010] [Indexed: 01/03/2023] Open
Abstract
Mammalian spermatozoa have relatively high water permeability and swell readily, as in the hypo-osmotic swelling test used in the andrology clinic. Physiologically, spermatozoa experience changes in the osmolality of the surrounding fluids in both the male and the female tracts on their journey from the testis to the ovum. Sperm volume regulation in response to such osmotic challenges is important to maintain a stable cell size for the normal shape and function of the sperm tail. Alongside ion channels for the fluxes of osmolytes, water channels would be crucial for sperm volume regulation. In contrast to the deep knowledge and numerous studies on somatic cell aquaporins (AQPs), the understanding of sperm AQPs is limited. Among the 13 AQPs, convincing evidence for their presence in spermatozoa has been confined to AQP7, AQP8 and AQP11. Overall, current findings indicate a major role of AQP8 in water influx and efflux for sperm volume regulation, which is required for natural fertilization. The preliminary data suggestive of a role for AQP7 in sperm glycerol metabolism needs further substantiation. The association of AQP11 with the residual cytoplasm of elongated spermatids and the distal tail of spermatozoa supports the hypothesis of more than just a role in conferring water permeability and also in the turnover and recycling of surplus cellular components made redundant during spermiogenesis and spermiation. This would be crucial for the maintenance of a germinal epithelium functioning efficiently in the production of spermatozoa.
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Affiliation(s)
- Ching-Hei Yeung
- Centre of Reproductive Medicine and Andrology, University Clinic, Muenster, Germany.
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Abstract
Water is the most abundant molecule in any cell. Specialized membrane channel, proteins called aquaporins, facilitate water transport across cell membranes. At least seven aquaporins (AQP): 1, 2, 3, 4, 6, 7, and 11 are expressed in the kidneys. Aquaporins play a role in both the short-term and long-term regulation of water balance as well as in the pathophysiology of water balance disorders. Aquaporin is composed of a single peptide chain consisting of approximately 270 amino acids. Inherited central and nephrogenic diabetes insipidus are primarily due to the decreased expression of AQP2 while mutation in the AQP2 molecule is responsible for inherited central diabetes insipidus. In acquired causes of nephrogenic diabetes insipidus, there is a downregulation of AQP2 expression in the inner medulla of the kidney. Nephrotic syndrome is characterized by excessive sodium and water reabsorption, although in spite of this, patients do not develop hyponatremia. There is a marked downregulation of both AQP2 and AQP3 expression, which could be a physiologic response to extracellular water reabsorption in patients with nephrotic syndrome. There are some conditions in which aquaporin expression has been found to increase such as experimentally induced heart failure, cirrhosis, and pregnancy. Some drugs such as cisplatin and cyclosporine, also alter the expression of aquaporins. The three-pore model of peritoneal transport depicts the importance of aquaporins. Thus, the understanding of renal water channels has solved the mystery behind many water balance disorders. Further insights into the molecular structure and biology of aquaporins will help to lay a foundation for the development of future drugs.
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Affiliation(s)
- S K Agarwal
- Department of Nephrology, All India Institute of Medical Sciences, New Delhi - 110 029, India
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Markin VS, Volkov AG, Jovanov E. Active movements in plants: Mechanism of trap closure by Dionaea muscipula Ellis. Plant Signal Behav 2008; 3:778-83. [PMID: 19513230 PMCID: PMC2637513 DOI: 10.4161/psb.3.10.6041] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2008] [Accepted: 04/04/2008] [Indexed: 05/08/2023]
Abstract
The Venus flytrap (Dionaea muscipula Ellis) captures insects with one of the most rapid movements in the plant kingdom. We investigated trap closure by mechanical and electrical stimuli using the novel charge-injection method and high-speed recording. We proposed a new hydroelastic curvature mechanism, which is based on the assumption that the lobes possess curvature elasticity and are composed of outer and inner hydraulic layers with different hydrostatic pressure. The open state of the trap contains high elastic energy accumulated due to the hydrostatic pressure difference between the hydraulic layers of the lobe. Stimuli open pores connecting the two layers, water rushes from one hydraulic layer to another, and the trap relaxes to the equilibrium configuration corresponding to the closed state. In this paper we derived equations describing this system based on elasticity Hamiltonian and found closing kinetics. The novel charge-injection stimulation method gives insight into mechanisms of the different steps of signal transduction and response in the plant kingdom.
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Affiliation(s)
- Vladislav S Markin
- Department of Neurology; University of Texas; Southwestern Medical Center; Dallas, Texas USA
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Abstract
Impaired urinary dilution leading to water retention and hyponatremia may occur in patients with cardiac failure, cirrhosis, pregnancy, hypothyroidism, glucocorticoid and mineralocorticoid deficiency. The mechanisms for these defects predominantly involve the non-osmotic stimulation of arginine vasopressin release with upregulation of aquaporin 2 water channel expression and trafficking to the apical membrane of the principal cells of the collecting duct. These perturbations are reversed by V2 vasopressin receptor antagonists. In contrast, urinary concentration defects leading to polyuria are vasopressin-resistant. They may involve several factors, such as impaired counter-current concentration secondary to downregulation of Na-K-2Cl co-transporter. Vasopressin-resistant downregulation of aquaporin 2 expression has also been described as a factor in impaired urinary concentration.
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Kamsteeg EJ, Heijnen I, van Os CH, Deen PM. The subcellular localization of an aquaporin-2 tetramer depends on the stoichiometry of phosphorylated and nonphosphorylated monomers. J Cell Biol 2000; 151:919-30. [PMID: 11076974 PMCID: PMC2169442 DOI: 10.1083/jcb.151.4.919] [Citation(s) in RCA: 142] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
In renal principal cells, vasopressin regulates the shuttling of the aquaporin (AQP)2 water channel between intracellular vesicles and the apical plasma membrane. Vasopressin-induced phosphorylation of AQP2 at serine 256 (S256) by protein kinase A (PKA) is essential for its localization in the membrane. However, phosphorylated AQP2 (p-AQP2) has also been detected in intracellular vesicles of noninduced principal cells. As AQP2 is expressed as homotetramers, we hypothesized that the number of p-AQP2 monomers in a tetramer might be critical for the its steady state distribution. Expressed in oocytes, AQP2-S256D and AQP2-S256A mimicked p-AQP2 and non-p-AQP2, respectively, as routing and function of AQP2-S256D and wild-type AQP2 (wt-AQP2) were identical, whereas AQP2-S256A was retained intracellularly. In coinjection experiments, AQP2-S256A and AQP2-S256D formed heterotetramers. Coinjection of different ratios of AQP2-S256A and AQP2-S256D cRNAs revealed that minimally three AQP2-S256D monomers in an AQP2 tetramer were essential for its plasma membrane localization. Therefore, our results suggest that in principal cells, minimally three monomers per AQP2 tetramer have to be phosphorylated for its steady state localization in the apical membrane. As other multisubunit channels are also regulated by phosphorylation, it is anticipated that the stoichiometry of their phosphorylated and nonphosphorylated subunits may fine-tune the activity or subcellular localization of these complexes.
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Affiliation(s)
- E J Kamsteeg
- Department of Cell Physiology, University Medical Center, St. Radboud, 6500HB Nijmegen, The Netherlands
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Carvajal M, Cerdá A, Martínez V. Does calcium ameliorate the negative effect of NaCl on melon root water transport by regulating aquaporin activity? New Phytol 2000; 145:439-447. [PMID: 33862910 DOI: 10.1046/j.1469-8137.2000.00593.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The hydraulic conductance (L0 ) of detached, exuding root systems from melon (Cucumis melo cv. Amarillo oro) was measured. All plants received a half-strength Hoagland nutrient solution, and plants stressed either solely with NaCl (50 mM) or with NaCl (50 mM) following treatment (2 d) with CaCl2 (10 mM) were compared with controls and CaCl2 -treated (10 mM) plants. The L0 of NaCl-treated plants was markedly decreased when compared to control and CaCl2 -treated plants, but the decrease was smaller when NaCl was added to plants previously treated with CaCl2 . A similar effect was observed when the flux of Ca2+ into the xylem and the Ca2+ concentration in the plasma membrane of the root cells were determined. In control, CaCl2 - and NaCl + CaCl2 -treated plants, HgCl2 treatment (50 μM) caused a sharp decline in L0 to values similar to those of NaCl-stressed roots, but L0 was restored by treatment with 5 mM DTT. However, in NaCl roots only a slight effect of Hg2+ and DTT were observed. The effect of all treatments on L0 was similar to that on osmotic water permeability (Pf ) of individual protoplasts isolated from roots. The results suggest that NaCl decreased the passage of water through the membrane and roots by reducing the activity of Hg-sensitive water channels. The ameliorative effect of Ca2+ on NaCl stress could be related to water-channel function.
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Affiliation(s)
- Micaela Carvajal
- 1 Dpto Fisiología y Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, CSIC, PO Box 4195, 30080 Murcia, Spain
| | - Antonio Cerdá
- 1 Dpto Fisiología y Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, CSIC, PO Box 4195, 30080 Murcia, Spain
| | - Vicente Martínez
- 1 Dpto Fisiología y Nutrición Vegetal, Centro de Edafología y Biología Aplicada del Segura, CSIC, PO Box 4195, 30080 Murcia, Spain
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Fischbarg J, Li J, Cheung M, Czegledy F, Iserovich P, Kuang K. Predictive evidence for a porin-type beta-barrel fold in CHIP28 and other members of the MIP family. A restricted-pore model common to water channels and facilitators. J Membr Biol 1995; 143:177-88. [PMID: 7539497 PMCID: PMC7087546 DOI: 10.1007/bf00233446] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [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] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Water channels are the subject of much current attention, as they may be central for cell functions in a host of tissues. We have analyzed the possible field of facilitators and water channels of the MIP family based on structural predictions, on findings about the topology of CHIP28, and on the biophysical characteristics of water channels. We developed predictions for the following proteins: MIP26, NOD26, GLP, BIB, gamma-TIP, FA-CHIP, CHIP28k, WCH-CD1, and CHIP28. We utilized Kyte Doolittle hydrophobicity, Eisenberg's amphiphilicity, Chou-Fasman-Prevelige propensities, and our own Union algorithm. We found that hydrophobic amphiphilic segments likely to be transmembrane were consistently shorter than required for alpha-helical segments, but of the correct length for beta-strands. Turn propensity was high at frequent intervals, consistent with transmembrane beta-strands. We propose that these proteins fold as porin-like 16-stranded antiparallel beta-barrels. In water channels, from the size of molecules excluded, an extramembrane loop(s) would enter the pore and restrict it to a bottleneck with a width 4 A < or = w < or = 5 A. A similar but more mobile loop(s) would act as gate and binding site for the facilitators of the MIP family.
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Affiliation(s)
- J Fischbarg
- Department of Physiology and Cellular Biophysics, College of Physicians and Surgeons, Columbia University, New York, N.Y. 10032, USA
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