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Dev S, Muchenditsi A, Gottlieb A, Deme P, Murphy S, Gabrielson KL, Dong Y, Hughes R, Haughey NJ, Hamilton JP, Lutsenko S. Oxysterol misbalance critically contributes to Wilson disease pathogenesis. Sci Adv 2022; 8:eadc9022. [PMID: 36260680 PMCID: PMC9581482 DOI: 10.1126/sciadv.adc9022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Wilson disease (WD) is a metabolic disorder caused by inactivation of the copper-transporting ATPase 2 (ATP7B) and copper (Cu) overload in tissues. Excess Cu causes oxidative stress and pathologic changes with poorly understood mechanistic connections. In Atp7b-/- mice with established liver disease, Cu overload activates the stress-sensitive transcription factor Nrf2 (nuclear factor erythroid-derived 2-like 2). Nrf2 targets, especially sulfotransferase 1e1 (Sult1e1), are strongly induced and cause elevation of sulfated sterols, whereas oxysterols are decreased. This sterol misbalance results in inhibition of the liver X receptor (LXR) and up-regulation of LXR targets associated with inflammatory responses. Pharmacological inhibition of Sult1e1 partially reverses oxysterol misbalance and LXR inhibition. Contribution of this pathway to advanced hepatic WD was demonstrated by treating mice with an LXR agonist. Treatment decreased inflammation by reducing expression of proinflammatory molecules, diminished fibrosis by down-regulating the noncanonical transforming growth factor-β signaling pathway, and improved liver morphology and function. Thus, the identified pathway is an important driver of WD.
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Affiliation(s)
- Som Dev
- Department of Physiology, Johns Hopkins University, School of Medicine, 725 North Wolfe St, Baltimore, MD 21205, USA
| | - Abigael Muchenditsi
- Department of Physiology, Johns Hopkins University, School of Medicine, 725 North Wolfe St, Baltimore, MD 21205, USA
| | - Aline Gottlieb
- Department of Physiology, Johns Hopkins University, School of Medicine, 725 North Wolfe St, Baltimore, MD 21205, USA
| | - Pragney Deme
- Department of Neurology, Johns Hopkins University, School of Medicine, 600 North Wolfe St, Baltimore, MD 21287, USA
| | - Sean Murphy
- Department of Biomedical Engineering, Johns Hopkins University, School of Medicine, 720 Rutland Ave, Baltimore, MD 21205, USA
| | - Kathleen L. Gabrielson
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University, School of Medicine, 733 North Broadway, Baltimore, MD 21205, USA
| | - Yixuan Dong
- Department of Physiology, Johns Hopkins University, School of Medicine, 725 North Wolfe St, Baltimore, MD 21205, USA
| | - Robert Hughes
- Department of Medicine, Johns Hopkins University, School of Medicine, 733 North Broadway, Baltimore, MD 21205, USA
| | - Norman J. Haughey
- Department of Neurology, Johns Hopkins University, School of Medicine, 600 North Wolfe St, Baltimore, MD 21287, USA
| | - James P. Hamilton
- Department of Medicine, Johns Hopkins University, School of Medicine, 733 North Broadway, Baltimore, MD 21205, USA
- Corresponding author. (S.L.); (J.P.H.)
| | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins University, School of Medicine, 725 North Wolfe St, Baltimore, MD 21205, USA
- Department of Medicine, Johns Hopkins University, School of Medicine, 733 North Broadway, Baltimore, MD 21205, USA
- Corresponding author. (S.L.); (J.P.H.)
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2
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Muchenditsi A. Systemic Deletion of Atp7b Modifies the Hepatocytes’ Response to Copper Overload in the Mouse Models of Wilson Disease. FASEB J 2021. [DOI: 10.1096/fasebj.2021.35.s1.02946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Muchenditsi A, Talbot CC, Gottlieb A, Yang H, Kang B, Boronina T, Cole R, Wang L, Dev S, Hamilton JP, Lutsenko S. Systemic deletion of Atp7b modifies the hepatocytes' response to copper overload in the mouse models of Wilson disease. Sci Rep 2021; 11:5659. [PMID: 33707579 PMCID: PMC7952580 DOI: 10.1038/s41598-021-84894-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [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: 05/21/2020] [Accepted: 02/09/2021] [Indexed: 02/03/2023] Open
Abstract
Wilson disease (WD) is caused by inactivation of the copper transporter Atp7b and copper overload in tissues. Mice with Atp7b deleted either globally (systemic inactivation) or only in hepatocyte recapitulate various aspects of human disease. However, their phenotypes vary, and neither the common response to copper overload nor factors contributing to variability are well defined. Using metabolic, histologic, and proteome analyses in three Atp7b-deficient mouse strains, we show that global inactivation of Atp7b enhances and specifically modifies the hepatocyte response to Cu overload. The loss of Atp7b only in hepatocytes dysregulates lipid and nucleic acid metabolisms and increases the abundance of respiratory chain components and redox balancing enzymes. In global knockouts, independently of their background, the metabolism of lipid, nucleic acid, and amino acids is inhibited, respiratory chain components are down-regulated, inflammatory response and regulation of chromosomal replication are enhanced. Decrease in glucokinase and lathosterol oxidase and elevation of mucin-13 and S100A10 are observed in all Atp7b mutant strains and reflect the extent of liver injury. The magnitude of proteomic changes in Atp7b-/- animals inversely correlates with the metallothioneins levels rather than liver Cu content. These findings facilitate identification of WD-specific metabolic and proteomic changes for diagnostic and treatment.
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Affiliation(s)
- Abigael Muchenditsi
- Department of Physiology, Johns Hopkins Medical Institutes, 725 N Wolfe street, Baltimore, MD, 21205, USA
| | - C Conover Talbot
- Core Analysis Unit, Johns Hopkins Medical Institutes, Baltimore, MD, 21205, USA
| | - Aline Gottlieb
- Department of Physiology, Johns Hopkins Medical Institutes, 725 N Wolfe street, Baltimore, MD, 21205, USA
| | - Haojun Yang
- Department of Physiology, Johns Hopkins Medical Institutes, 725 N Wolfe street, Baltimore, MD, 21205, USA
| | - Byunghak Kang
- Department of Molecular and Comparative Pathobiology, Johns Hopkins Medical Institutes, Baltimore, MD, 21205, USA
- Novartis Institutes for Biomedical Research, Cambridge, MA, USA
| | - Tatiana Boronina
- Mass Spectrometry and Proteomics Facility, Johns Hopkins Medical Institutes, Baltimore, MD, 21205, USA
| | - Robert Cole
- Mass Spectrometry and Proteomics Facility, Johns Hopkins Medical Institutes, Baltimore, MD, 21205, USA
| | - Li Wang
- Department of Physiology, Johns Hopkins Medical Institutes, 725 N Wolfe street, Baltimore, MD, 21205, USA
| | - Som Dev
- Department of Physiology, Johns Hopkins Medical Institutes, 725 N Wolfe street, Baltimore, MD, 21205, USA
| | - James P Hamilton
- Department of Medicine, Johns Hopkins Medical Institutes, Baltimore, MD, 21205, USA
| | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins Medical Institutes, 725 N Wolfe street, Baltimore, MD, 21205, USA.
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Culbertson EM, Khan AA, Muchenditsi A, Lutsenko S, Sullivan DJ, Petris MJ, Cormack BP, Culotta VC. Changes in mammalian copper homeostasis during microbial infection. Metallomics 2021; 12:416-426. [PMID: 31976503 DOI: 10.1039/c9mt00294d] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Animals carefully control homeostasis of Cu, a metal that is both potentially toxic and an essential nutrient. During infection, various shifts in Cu homeostasis can ensue. In mice infected with Candida albicans, serum Cu progressively rises and at late stages of infection, liver Cu rises, while kidney Cu declines. The basis for these changes in Cu homeostasis was poorly understood. We report here that the progressive rise in serum Cu is attributable to liver production of the multicopper oxidase ceruloplasmin (Cp). Through studies using Cp-/- mice, we find this elevated Cp helps recover serum Fe levels at late stages of infection, consistent with a role for Cp in loading transferrin with Fe. Cp also accounts for the elevation in liver Cu seen during infection, but not for the fluctuations in kidney Cu. The Cu exporting ATPase ATP7B is one candidate for kidney Cu control, but we find no change in the pattern of kidney Cu loss during infection of Atp7b-/- mice, implying alternative mechanisms. To test whether fungal infiltration of kidney tissue was required for kidney Cu loss, we explored other paradigms of infection. Infection with the intravascular malaria parasite Plasmodium berghei caused a rise in serum Cu and decrease in kidney Cu similar to that seen with C. albicans. Thus, dynamics in kidney Cu homeostasis appear to be a common feature among vastly different infection paradigms. The implications for such Cu homeostasis control in immunity are discussed.
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Affiliation(s)
- Edward M Culbertson
- The Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA.
| | - Aslam A Khan
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
| | - Abigael Muchenditsi
- Department of Physiology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Svetlana Lutsenko
- Department of Physiology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - David J Sullivan
- The W. Harry Feinstone Department of Molecular Microbiology and Immunology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA
| | - Michael J Petris
- Department of Biochemistry, University of Missouri, Columbia, MO 65211, USA
| | - Brendan P Cormack
- Department of Molecular Biology and Genetics, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Valeria C Culotta
- The Department of Biochemistry and Molecular Biology, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD 21205, USA.
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5
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Schmidt K, Bari B, Ralle M, Washington-Hughes C, Muchenditsi A, Maxey E, Lutsenko S. Localization of the Locus Coeruleus in the Mouse Brain. J Vis Exp 2019. [PMID: 30907876 DOI: 10.3791/58652] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The locus coeruleus (LC) is a major hub of norepinephrine producing neurons that modulate a number of physiological functions. Structural or functional abnormalities of LC impact several brain regions including cortex, hippocampus, and cerebellum and may contribute to depression, bipolar disorder, anxiety, as well as Parkinson disease and Alzheimer disease. These disorders are often associated with metal misbalance, but the role of metals in LC is only partially understood. Morphologic and functional studies of LC are needed to better understand the human pathologies and contribution of metals. Mice are a widely used experimental model, but the mouse LC is small (~0.3 mm diameter) and hard to identify for a non-expert. Here, we describe a step-by-step immunohistochemistry-based protocol to localize the LC in the mouse brain. Dopamine-β-hydroxylase (DBH), and alternatively, tyrosine hydroxylase (TH), both enzymes highly expressed in the LC, are used as immunohistochemical markers in brain slices. Sections adjacent to LC-containing sections can be used for further analysis, including histology for morphological studies, metabolic testing, as well as metal imaging by X-ray fluorescence microscopy (XFM).
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Affiliation(s)
- Katharina Schmidt
- Department of Physiology, Johns Hopkins University, School of Medicine;
| | - Bilal Bari
- Department of Neuroscience, Johns Hopkins University
| | | | | | | | - Evan Maxey
- Department of Neuroscience, Johns Hopkins University
| | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins University, School of Medicine
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Schmidt K, Ralle M, Schaffer T, Jayakanthan S, Bari B, Muchenditsi A, Lutsenko S. ATP7A and ATP7B copper transporters have distinct functions in the regulation of neuronal dopamine-β-hydroxylase. J Biol Chem 2018; 293:20085-20098. [PMID: 30341172 DOI: 10.1074/jbc.ra118.004889] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [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: 07/13/2018] [Revised: 10/17/2018] [Indexed: 01/06/2023] Open
Abstract
The copper (Cu) transporters ATPase copper-transporting alpha (ATP7A) and ATPase copper-transporting beta (ATP7B) are essential for the normal function of the mammalian central nervous system. Inactivation of ATP7A or ATP7B causes the severe neurological disorders, Menkes disease and Wilson disease, respectively. In both diseases, Cu imbalance is associated with abnormal levels of the catecholamine-type neurotransmitters dopamine and norepinephrine. Dopamine is converted to norepinephrine by dopamine-β-hydroxylase (DBH), which acquires its essential Cu cofactor from ATP7A. However, the role of ATP7B in catecholamine homeostasis is unclear. Here, using immunostaining of mouse brain sections and cultured cells, we show that DBH-containing neurons express both ATP7A and ATP7B. The two transporters are located in distinct cellular compartments and oppositely regulate the export of soluble DBH from cultured neuronal cells under resting conditions. Down-regulation of ATP7A, overexpression of ATP7B, and pharmacological Cu depletion increased DBH retention in cells. In contrast, ATP7B inactivation elevated extracellular DBH. Proteolytic processing and the specific activity of exported DBH were not affected by changes in ATP7B levels. These results establish distinct regulatory roles for ATP7A and ATP7B in neuronal cells and explain, in part, the lack of functional compensation between these two transporters in human disorders of Cu imbalance.
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Affiliation(s)
- Katharina Schmidt
- From the Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Martina Ralle
- the Department of Molecular and Medical Genetics, Oregon Health and Science University, Portland, Oregon 97239
| | - Thomas Schaffer
- the Department of Biological Chemistry, Johns Hopkins University, Baltimore, Maryland 21205, and
| | - Samuel Jayakanthan
- From the Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Bilal Bari
- the Department of Neuroscience, Brain Science Institute, Johns Hopkins University, Baltimore, Maryland 21205
| | - Abigael Muchenditsi
- From the Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205
| | - Svetlana Lutsenko
- From the Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205,.
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7
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Pierson H, Muchenditsi A, Kim BE, Ralle M, Zachos N, Huster D, Lutsenko S. The Function of ATPase Copper Transporter ATP7B in Intestine. Gastroenterology 2018; 154:168-180.e5. [PMID: 28958857 PMCID: PMC5848507 DOI: 10.1053/j.gastro.2017.09.019] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 09/13/2017] [Accepted: 09/17/2017] [Indexed: 12/21/2022]
Abstract
BACKGROUND & AIMS Wilson disease is a disorder of copper (Cu) misbalance caused by mutations in ATP7B. ATP7B is highly expressed in the liver-the major site of Cu accumulation in patients with Wilson disease. The intestine also expresses ATP7B, but little is known about the contribution of intestinal ATP7B to normal intestinal copper homeostasis or to Wilson disease manifestations. We characterized the role of ATP7B in mouse intestinal organoids and tissues. METHODS We collected intestinal tissues from ATP7B-knockout (Atp7b-/-) and control mice, and established 3-dimensional enteroids. Immunohistochemistry and x-ray fluorescence were used to characterize the distribution of ATP7B and Cu in tissues. Electron microscopy, histologic analyses, and immunoblotting were used to determine the effects of ATP7B loss. Enteroids derived from control and ATP7B-knockout mice were incubated with excess Cu or with Cu-chelating reagents; effects on cell fat content and ATP7B levels and localization were determined by fluorescent confocal microscopy. RESULTS ATP7B maintains a Cu gradient along the duodenal crypt-villus axis and buffers Cu levels in the cytosol of enterocytes. These functions are mediated by rapid Cu-dependent enlargement of ATP7B-containing vesicles and increased levels of ATP7B. Intestines of Atp7b-/- mice had reduced Cu storage pools in intestine, Cu depletion, accumulation of triglyceride-filled vesicles in enterocytes, mislocalization of apolipoprotein B, and loss of chylomicrons. In primary 3-dimensional enteroids, administration of excess Cu or Cu chelators impaired assembly of chylomicrons. CONCLUSIONS ATP7B regulates vesicular storage of Cu in mouse intestine. ATP7B buffers Cu levels in enterocytes to maintain a range necessary for formation of chylomicrons. Misbalance of Cu and lipid in the intestine could account for gastrointestinal manifestations of Wilson disease.
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Affiliation(s)
- Hannah Pierson
- Department of Physiology, Johns Hopkins University – School of Medicine, USA
| | - Abigael Muchenditsi
- Department of Physiology, Johns Hopkins University – School of Medicine, USA
| | - Byung-Eun Kim
- Department of Animal and Avian Sciences, University of Maryland, USA
| | - Martina Ralle
- Department of Molecular and Medical Genetics, Oregon Health Science University, USA
| | - Nicholas Zachos
- Department of Medicine, Division of Gastroenterology and Hepatology, Johns Hopkins University, USA
| | - Dominik Huster
- Department of Gastroenterology, Hepatology and Infectious Diseases, Otto-von-Guericke University, Magdeburg, Germany
| | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, Maryland.
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8
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Muchenditsi A, Yang H, Hamilton JP, Koganti L, Housseau F, Aronov L, Fan H, Pierson H, Bhattacharjee A, Murphy R, Sears C, Potter J, Wooton-Kee CR, Lutsenko S. Targeted inactivation of copper transporter Atp7b in hepatocytes causes liver steatosis and obesity in mice. Am J Physiol Gastrointest Liver Physiol 2017; 313:G39-G49. [PMID: 28428350 PMCID: PMC5538836 DOI: 10.1152/ajpgi.00312.2016] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2016] [Revised: 03/09/2017] [Accepted: 03/26/2017] [Indexed: 01/31/2023]
Abstract
Copper-transporting ATPase 2 (ATP7B) is essential for mammalian copper homeostasis. Mutations in ATP7B result in copper accumulation, especially in the liver, and cause Wilson disease (WD). The major role of hepatocytes in WD pathology is firmly established. It is less certain whether the excess Cu in hepatocytes is solely responsible for development of WD. To address this issue, we generated a mouse strain for Cre-mediated deletion of Atp7b and inactivated Atp7b selectively in hepatocytes. Atp7bΔHep mice accumulate copper in the liver, have elevated urinary copper, and lack holoceruloplasmin but show no liver disease for up to 30 wk. Liver inflammation is muted and markedly delayed compared with the age-matched Atp7b-/- null mice, which show a strong type1 inflammatory response. Expression of metallothioneins is higher in Atp7bΔHep livers than in Atp7b-/- mice, suggesting better sequestration of excess copper. Characterization of purified cell populations also revealed that nonparenchymal cells in Atp7bΔHep liver maintain Atp7b expression, have normal copper balance, and remain largely quiescent. The lack of inflammation unmasked metabolic consequences of copper misbalance in hepatocytes. Atp7bΔHep animals weigh more than controls and have higher levels of liver triglycerides and 3-hydroxy-3-methyl-glutaryl-CoA (HMG-CoA) reductase. By 45 wk, all animals develop liver steatosis on a regular diet. Thus copper misbalance in hepatocytes dysregulates lipid metabolism, whereas development of inflammatory response in WD may depend on copper status of nonparenchymal cells. The implications of these findings for the cell-targeting WD therapies are discussed.NEW & NOTEWORTHY Targeted inactivation of copper-transporting ATPase 2 (Atp7b) in hepatocytes causes steatosis in the absence of inflammation.
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Affiliation(s)
| | - Haojun Yang
- 1Department of Physiology, Johns Hopkins University, Baltimore, Maryland;
| | - James P. Hamilton
- 2Division of Gastroenterology, Johns Hopkins University, Baltimore, Maryland;
| | - Lahari Koganti
- 2Division of Gastroenterology, Johns Hopkins University, Baltimore, Maryland;
| | - Franck Housseau
- 3Department of Cancer Immunology, Johns Hopkins University, Baltimore, Maryland;
| | - Lisa Aronov
- 4New York University Langone Medical Center, New York, New York;
| | - Hongni Fan
- 3Department of Cancer Immunology, Johns Hopkins University, Baltimore, Maryland;
| | - Hannah Pierson
- 1Department of Physiology, Johns Hopkins University, Baltimore, Maryland;
| | | | | | - Cynthia Sears
- 3Department of Cancer Immunology, Johns Hopkins University, Baltimore, Maryland;
| | - James Potter
- 2Division of Gastroenterology, Johns Hopkins University, Baltimore, Maryland;
| | | | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins University, Baltimore, Maryland;
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9
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Lee S, Barin G, Ackerman CM, Muchenditsi A, Xu J, Reimer JA, Lutsenko S, Long JR, Chang CJ. Copper Capture in a Thioether-Functionalized Porous Polymer Applied to the Detection of Wilson's Disease. J Am Chem Soc 2016; 138:7603-9. [PMID: 27285482 PMCID: PMC5555401 DOI: 10.1021/jacs.6b02515] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
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Copper is an essential
nutrient for life, but at the same time,
hyperaccumulation of this redox-active metal in biological fluids
and tissues is a hallmark of pathologies such as Wilson’s and
Menkes diseases, various neurodegenerative diseases, and toxic environmental
exposure. Diseases characterized by copper hyperaccumulation are currently
challenging to identify due to costly diagnostic tools that involve
extensive technical workup. Motivated to create simple yet highly
selective and sensitive diagnostic tools, we have initiated a program
to develop new materials that can enable monitoring of copper levels
in biological fluid samples without complex and expensive instrumentation.
Herein, we report the design, synthesis, and properties of PAF-1-SMe,
a robust three-dimensional porous aromatic framework (PAF) densely
functionalized with thioether groups for selective capture and concentration
of copper from biofluids as well as aqueous samples. PAF-1-SMe exhibits
a high selectivity for copper over other biologically relevant metals,
with a saturation capacity reaching over 600 mg/g. Moreover, the combination
of PAF-1-SMe as a material for capture and concentration of copper
from biological samples with 8-hydroxyquinoline as a colorimetric
indicator affords a method for identifying aberrant elevations of
copper in urine samples from mice with Wilson’s disease and
also tracing exogenously added copper in serum. This divide-and-conquer
sensing strategy, where functional and robust porous materials serve
as molecular recognition elements that can be used to capture and
concentrate analytes in conjunction with molecular indicators for
signal readouts, establishes a valuable starting point for the use
of porous polymeric materials in noninvasive diagnostic applications.
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Affiliation(s)
| | | | | | - Abigael Muchenditsi
- Department of Physiology, Johns Hopkins University, School of Medicine , Baltimore, Maryland 21205, United States
| | | | | | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins University, School of Medicine , Baltimore, Maryland 21205, United States
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Hamilton JP, Koganti L, Muchenditsi A, Pendyala VS, Huso D, Hankin J, Murphy RC, Huster D, Merle U, Mangels C, Yang N, Potter JJ, Mezey E, Lutsenko S. Activation of liver X receptor/retinoid X receptor pathway ameliorates liver disease in Atp7B(-/-) (Wilson disease) mice. Hepatology 2016; 63:1828-41. [PMID: 26679751 PMCID: PMC4874878 DOI: 10.1002/hep.28406] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 10/30/2015] [Accepted: 12/15/2015] [Indexed: 01/07/2023]
Abstract
UNLABELLED Wilson disease (WD) is a hepatoneurological disorder caused by mutations in the copper-transporter, ATP7B. Copper accumulation in the liver is a hallmark of WD. Current therapy is based on copper chelation, which decreases the manifestations of liver disease, but often worsens neurological symptoms. We demonstrate that in Atp7b(-/-) mice, an animal model of WD, liver function can be significantly improved without copper chelation. Analysis of transcriptional and metabolic changes in samples from WD patients and Atp7b(-/-) mice identified dysregulation of nuclear receptors (NRs), especially the liver X receptor (LXR)/retinoid X receptor heterodimer, as an important event in WD pathogenesis. Treating Atp7b(-/-) mice with the LXR agonist, T0901317, ameliorated disease manifestations despite significant copper overload. Genetic markers of liver fibrosis and inflammatory cytokines were significantly decreased, lipid profiles normalized, and liver function and histology were improved. CONCLUSIONS The results demonstrate the major role of an altered NR function in the pathogenesis of WD and suggest that modulation of NR activity should be explored as a supplementary approach to improving liver function in WD. (Hepatology 2016;63:1828-1841).
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Affiliation(s)
- JP Hamilton
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - L Koganti
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - A Muchenditsi
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - VS Pendyala
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - D Huso
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - J Hankin
- University of Colorado, Denver, CO
| | | | - D Huster
- Deakoness Hospital, Leipzig, Germany
| | - U Merle
- University of Heidelberg, Germany
| | - C Mangels
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - N Yang
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - JJ Potter
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - E Mezey
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - S. Lutsenko
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD,Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD
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11
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Flynn S, Dalphin M, Tellez M, Fieten H, Weldy S, Muchenditsi A, Lutsenko S, Linder M. Relation of Copper Toxicosis in Dogs and Wilson Disease to the Appearance of a Small Copper Carrier (SCC) in Blood Plasma and Urine. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.921.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Stephen Flynn
- Chemistry and BiochemistryCalifornia State UniversityFullertonCaliforniaUnited States
| | - Matthew Dalphin
- Chemistry and BiochemistryCalifornia State UniversityFullertonCaliforniaUnited States
| | - Miguel Tellez
- Chemistry and BiochemistryCalifornia State UniversityFullertonCaliforniaUnited States
| | - Hille Fieten
- Veterinary MedicineUniversity of UtrechtUtrechtNetherlands
| | - Scott Weldy
- Veterinarian Serrano Animal and Bird HospitalLake ForestCaliforniaUnited States
| | - Abigael Muchenditsi
- Department of PhysiologyJohns Hopkins UniversityBaltimoreMarylandUnited States
| | - Svetlana Lutsenko
- Department of PhysiologyJohns Hopkins UniversityBaltimoreMarylandUnited States
| | - Maria Linder
- Chemistry and BiochemistryCalifornia State UniversityFullertonCaliforniaUnited States
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12
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Gray LW, Peng F, Molloy SA, Pendyala VS, Muchenditsi A, Muzik O, Lee J, Kaplan JH, Lutsenko S. Urinary copper elevation in a mouse model of Wilson's disease is a regulated process to specifically decrease the hepatic copper load. PLoS One 2012; 7:e38327. [PMID: 22802922 PMCID: PMC3390108 DOI: 10.1371/journal.pone.0038327] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 05/03/2012] [Indexed: 12/19/2022] Open
Abstract
Body copper homeostasis is regulated by the liver, which removes excess copper
via bile. In Wilson's disease (WD), this function is disrupted due to
inactivation of the copper transporter ATP7B resulting in hepatic copper
overload. High urinary copper is a diagnostic feature of WD linked to liver
malfunction; the mechanism behind urinary copper elevation is not fully
understood. Using Positron Emission Tomography-Computed Tomography (PET-CT)
imaging of live Atp7b−/− mice at
different stages of disease, a longitudinal metal analysis, and characterization
of copper-binding molecules, we show that urinary copper elevation is a specific
regulatory process mediated by distinct molecules. PET-CT and atomic absorption
spectroscopy directly demonstrate an age-dependent decrease in the capacity of
Atp7b−/− livers to accumulate
copper, concomitant with an increase in urinary copper. This reciprocal
relationship is specific for copper, indicating that cell necrosis is not the
primary cause for the initial phase of metal elevation in the urine. Instead,
the urinary copper increase is associated with the down-regulation of the
copper-transporter Ctr1 in the liver and appearance of a 2 kDa Small Copper
Carrier, SCC, in the urine. SCC is also elevated in the urine of the
liver-specific Ctr1−/− knockouts, which
have normal ATP7B function, suggesting that SCC is a normal metabolite carrying
copper in the serum. In agreement with this hypothesis, partially purified
SCC-Cu competes with free copper for uptake by Ctr1. Thus, hepatic
down-regulation of Ctr1 allows switching to an SCC-mediated removal of copper
via kidney when liver function is impaired. These results demonstrate that the
body regulates copper export through more than one mechanism; better
understanding of urinary copper excretion may contribute to an improved
diagnosis and monitoring of WD.
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Affiliation(s)
- Lawrence W. Gray
- Department of Physiology, Johns Hopkins
University, School of Medicine, Baltimore, Maryland, United States of
America
| | - Fangyu Peng
- Department of Radiology, University of Texas
Southwestern Medical Center, Dallas, Texas, United States of America
| | - Shannon A. Molloy
- Department of Biochemistry and Molecular
Genetics, University of Illinois at Chicago, Chicago, Illinois, United States of
America
| | - Venkata S. Pendyala
- Department of Physiology, Johns Hopkins
University, School of Medicine, Baltimore, Maryland, United States of
America
| | - Abigael Muchenditsi
- Department of Physiology, Johns Hopkins
University, School of Medicine, Baltimore, Maryland, United States of
America
| | - Otto Muzik
- Carman and Ann Adams Department of Pediatrics
and Department of Radiology, Wayne State University, School of Medicine,
Detroit, Michigan, United States of America
| | - Jaekwon Lee
- Redox Biology Center, Department of
Biochemistry, University of Nebraska, Lincoln, Nebraska, United States of
America
| | - Jack H. Kaplan
- Department of Biochemistry and Molecular
Genetics, University of Illinois at Chicago, Chicago, Illinois, United States of
America
| | - Svetlana Lutsenko
- Department of Physiology, Johns Hopkins
University, School of Medicine, Baltimore, Maryland, United States of
America
- * E-mail:
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13
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Anupam R, Denapoli L, Muchenditsi A, Hines JV. Identification of neomycin B-binding site in T box antiterminator model RNA. Bioorg Med Chem 2008; 16:4466-70. [PMID: 18329274 DOI: 10.1016/j.bmc.2008.02.056] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 02/12/2008] [Accepted: 02/19/2008] [Indexed: 11/30/2022]
Abstract
The T box transcription antitermination mechanism regulates the expression of unique genes in many Gram-positive bacteria by responding, in a magnesium-dependent manner, to uncharged cognate tRNA base pairing with an antiterminator RNA element and other regions of the 5'-untranslated region. Model T box antiterminator RNA is known to bind aminoglycosides, ligands that typically bind RNA in divalent metal ion-binding sites. In this study, enzymatic footprinting and spectroscopic assays were used to identify and characterize the binding site of neomycin B to an antiterminator model RNA. Neomycin B binds the antiterminator bulge nucleotides in an electrostatic-dependent manner and displaces 3-4 monovalent cations, indicating that the antiterminator likely contains a divalent metal ion-binding site. Neomycin B facilitates rather than inhibits tRNA binding indicating that bulge-targeted inhibitors that bind the antiterminator via non-electrostatic interactions may be the more optimal candidates for antiterminator-targeted ligand design.
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Affiliation(s)
- Rajaneesh Anupam
- Department of Chemistry and Biochemistry, Ohio University, Athens, OH 45701, USA
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