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Zhang W, Wu H, Luo S, Lu X, Tan X, Wen L, Ma X, Efferth T. Molecular insights into experimental models and therapeutics for cholestasis. Biomed Pharmacother 2024; 174:116594. [PMID: 38615607 DOI: 10.1016/j.biopha.2024.116594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 04/02/2024] [Accepted: 04/10/2024] [Indexed: 04/16/2024] Open
Abstract
Cholestatic liver disease (CLD) is a range of conditions caused by the accumulation of bile acids (BAs) or disruptions in bile flow, which can harm the liver and bile ducts. To investigate its pathogenesis and treatment, it is essential to establish and assess experimental models of cholestasis, which have significant clinical value. However, owing to the complex pathogenesis of cholestasis, a single modelling method can merely reflect one or a few pathological mechanisms, and each method has its adaptability and limitations. We summarize the existing experimental models of cholestasis, including animal models, gene-knockout models, cell models, and organoid models. We also describe the main types of cholestatic disease simulated clinically. This review provides an overview of targeted therapy used for treating cholestasis based on the current research status of cholestasis models. In addition, we discuss the respective advantages and disadvantages of different models of cholestasis to help establish experimental models that resemble clinical disease conditions. In sum, this review not only outlines the current research with cholestasis models but also projects prospects for clinical treatment, thereby bridging basic research and practical therapeutic applications.
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Affiliation(s)
- Wenwen Zhang
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Hefei Wu
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Shiman Luo
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Xiaohua Lu
- Department of Pharmaceutical Biology, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Mainz, Germany
| | - Xiyue Tan
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Li Wen
- School of Basic Medicine, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
| | - Xiao Ma
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China.
| | - Thomas Efferth
- Department of Pharmaceutical Biology, Institute of Pharmaceutical and Biomedical Sciences, Johannes Gutenberg University, Mainz, Germany.
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Troutman AD, Srinivasan S, Metzger CE, Fallen PB, Chen N, O'Neill KD, Allen MR, Biruete A, Moe SM, Avin KG. Musculoskeletal Health Worsened from Carnitine Supplementation and Not Impacted by a Novel Individualized Treadmill Training Protocol. Am J Nephrol 2024; 55:369-379. [PMID: 38377965 PMCID: PMC11147712 DOI: 10.1159/000537827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 02/12/2024] [Indexed: 02/22/2024]
Abstract
INTRODUCTION Chronic kidney disease (CKD) negatively affects musculoskeletal health, leading to reduced mobility, and quality of life. In healthy populations, carnitine supplementation and aerobic exercise have been reported to improve musculoskeletal health. However, there are inconclusive results regarding their effectiveness and safety in CKD. We hypothesized that carnitine supplementation and individualized treadmill exercise would improve musculoskeletal health in CKD. METHODS We used a spontaneously progressive CKD rat model (Cy/+ rat) (n = 11-12/gr): (1) Cy/+ (CKD-Ctrl), (2) CKD-carnitine (CKD-Carn), and (3) CKD-treadmill (CKD-TM). Carnitine (250 mg/kg) was injected daily for 10 weeks. Rats in the treadmill group ran 4 days/week on a 5° incline for 10 weeks progressing from 30 min/day for week one to 40 min/day for week two to 50 min/day for the remaining 8 weeks. At 32 weeks of age, we assessed overall cardiopulmonary fitness, muscle function, bone histology and architecture, and kidney function. Data were analyzed by one-way ANOVA with Tukey's multiple comparisons tests. RESULTS Moderate to severe CKD was confirmed by biochemistries for blood urea nitrogen (mean 43 ± 5 mg/dL CKD-Ctrl), phosphorus (mean 8 ± 1 mg/dL CKD-Ctrl), parathyroid hormone (PTH; mean 625 ± 185 pg/mL CKD-Ctrl), and serum creatinine (mean 1.1 ± 0.2 mg/mL CKD-Ctrl). Carnitine worsened phosphorous (mean 11 ± 3 mg/dL CKD-Carn; p < 0.0001), PTH (mean 1,738 ± 1,233 pg/mL CKD-Carn; p < 0.0001), creatinine (mean 1 ± 0.3 mg/dL CKD-Carn; p < 0.0001), cortical bone thickness (mean 0.5 ± 0.1 mm CKD-Ctrl, 0.4 ± 0.1 mm CKD-Carn; p < 0.05). Treadmill running significantly improves maximal aerobic capacity when compared to CKD-Ctrl (mean 14 ± 2 min CKD-TM, 10 ± 2 min CKD-Ctrl; p < 0.01). CONCLUSION Carnitine supplementation worsened CKD progression, mineral metabolism biochemistries, and cortical porosity and did not have an impact on physical function. Individualized treadmill running improved maximal aerobic capacity but did not have an impact on CKD progression or bone properties. Future studies should seek to better understand carnitine doses in conditions of compromised renal function to prevent toxicity which may result from elevated carnitine levels and to optimize exercise prescriptions for musculoskeletal health.
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Affiliation(s)
- Ashley D Troutman
- Department of Physical Therapy, School of Health and Human Sciences, Indiana University, Indianapolis, Indiana, USA
| | - Shruthi Srinivasan
- Division of Nephrology and Hypertension, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Corinne E Metzger
- Department of Anatomy, Physiology and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Paul B Fallen
- Department of Anatomy, Physiology and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Neal Chen
- Division of Nephrology and Hypertension, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Kalisha D O'Neill
- Division of Nephrology and Hypertension, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Matthew R Allen
- Department of Anatomy, Physiology and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana, USA
| | - Annabel Biruete
- Division of Nephrology and Hypertension, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Nutrition Science, Purdue University, West Lafayette, Indiana, USA
| | - Sharon M Moe
- Division of Nephrology and Hypertension, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Anatomy, Physiology and Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Keith G Avin
- Department of Physical Therapy, School of Health and Human Sciences, Indiana University, Indianapolis, Indiana, USA
- Division of Nephrology and Hypertension, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA
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Kofotolios I, Bonios MJ, Adamopoulos M, Mourouzis I, Filippatos G, Boletis JN, Marinaki S, Mavroidis M. The Han:SPRD Rat: A Preclinical Model of Polycystic Kidney Disease. Biomedicines 2024; 12:362. [PMID: 38397964 PMCID: PMC10887417 DOI: 10.3390/biomedicines12020362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/27/2024] [Accepted: 01/30/2024] [Indexed: 02/25/2024] Open
Abstract
Autosomal Dominant Polycystic Kidney Disease (ADPKD) stands as the most prevalent hereditary renal disorder in humans, ultimately culminating in end-stage kidney disease. Animal models carrying mutations associated with polycystic kidney disease have played an important role in the advancement of ADPKD research. The Han:SPRD rat model, carrying an R823W mutation in the Anks6 gene, is characterized by cyst formation and kidney enlargement. The mutated protein, named Samcystin, is localized in cilia of tubular epithelial cells and seems to be involved in cystogenesis. The homozygous Anks6 mutation leads to end-stage renal disease and death, making it a critical factor in kidney development and function. This review explores the utility of the Han:SPRD rat model, highlighting its phenotypic similarity to human ADPKD. Specifically, we discuss its role in preclinical trials and its importance for investigating the pathogenesis of the disease and developing new therapeutic approaches.
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Affiliation(s)
- Ioannis Kofotolios
- Clinic of Nephrology and Renal Tranplantation, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Center of Basic Research, Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece (M.M.)
| | - Michael J. Bonios
- Heart Failure and Transplant Unit, Onassis Cardiac Surgery Center, 17674 Athens, Greece;
| | - Markos Adamopoulos
- Center of Basic Research, Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece (M.M.)
| | - Iordanis Mourouzis
- Department of Pharmacology, National and Kapodistrian University of Athens, 11527 Athens, Greece;
| | - Gerasimos Filippatos
- Department of Cardiology, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, 12462 Athens, Greece
| | - John N. Boletis
- Clinic of Nephrology and Renal Tranplantation, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Smaragdi Marinaki
- Clinic of Nephrology and Renal Tranplantation, Laiko Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
| | - Manolis Mavroidis
- Center of Basic Research, Biomedical Research Foundation, Academy of Athens, 11527 Athens, Greece (M.M.)
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Biruete A, Chen NX, Metzger CE, Srinivasan S, O'Neill K, Fallen PB, Fonseca A, Wilson HE, de Loor H, Evenepoel P, Swanson KS, Allen MR, Moe SM. The Dietary Fiber Inulin Slows Progression of Chronic Kidney Disease-Mineral Bone Disorder (CKD-MBD) in a Rat Model of CKD. JBMR Plus 2023; 7:e10837. [PMID: 38130753 PMCID: PMC10731114 DOI: 10.1002/jbm4.10837] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 09/14/2023] [Accepted: 09/22/2023] [Indexed: 12/23/2023] Open
Abstract
Chronic kidney disease (CKD)-mineral bone disorder (CKD-MBD) leads to fractures and cardiovascular disease. Observational studies suggest beneficial effects of dietary fiber on both bone and cardiovascular outcomes, but the effect of fiber on CKD-MBD is unknown. To determine the effect of fiber on CKD-MBD, we fed the Cy/+ rat with progressive CKD a casein-based diet of 0.7% phosphate with 10% inulin (fermentable fiber) or cellulose (non-fermentable fiber) from 22 weeks to either 30 or 32 weeks of age (~30% and ~15% of normal kidney function; CKD 4 and 5). We assessed CKD-MBD end points of biochemistry, bone quantity and quality, cardiovascular health, and cecal microbiota and serum gut-derived uremic toxins. Results were analyzed by two-way analysis of variance (ANOVA) to evaluate the main effects of CKD stage and inulin, and their interaction. The results showed that in CKD animals, inulin did not alter kidney function but reduced the increase from stage 4 to 5 in serum levels of phosphate and parathyroid hormone, but not fibroblast growth factor-23 (FGF23). Bone turnover and cortical bone parameters were similarly improved but mechanical properties were not altered. Inulin slowed progression of aorta and cardiac calcification, left ventricular mass index, and fibrosis. To understand the mechanism, we assessed intestinal microbiota and found changes in alpha and beta diversity and significant changes in several taxa with inulin, together with a reduction in circulating gut derived uremic toxins such as indoxyl sulfate and short-chain fatty acids. In conclusion, the addition of the fermentable fiber inulin to the diet of CKD rats led to a slowed progression of CKD-MBD without affecting kidney function, likely mediated by changes in the gut microbiota composition and lowered gut-derived uremic toxins. © 2023 The Authors. JBMR Plus published by Wiley Periodicals LLC. on behalf of American Society for Bone and Mineral Research.
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Affiliation(s)
- Annabel Biruete
- Department of Nutrition SciencePurdue UniversityWest LafayetteINUSA
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
| | - Neal X. Chen
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
| | - Corinne E. Metzger
- Department of Anatomy, Cell Biology, and PhysiologyIndiana University School of MedicineIndianapolisINUSA
| | - Shruthi Srinivasan
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
| | - Kalisha O'Neill
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
| | - Paul B. Fallen
- Department of Anatomy, Cell Biology, and PhysiologyIndiana University School of MedicineIndianapolisINUSA
| | - Austin Fonseca
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
| | - Hannah E. Wilson
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
| | - Henriette de Loor
- KU Leuven Department of Microbiology and ImmunologyNephrology and Renal Transplantation Research Group, KU LeuvenLeuvenBelgium
| | - Pieter Evenepoel
- KU Leuven Department of Microbiology and ImmunologyNephrology and Renal Transplantation Research Group, KU LeuvenLeuvenBelgium
- Department of Nephrology and Renal TransplantationUniversity Hospitals LeuvenLeuvenBelgium
| | - Kelly S. Swanson
- Department of Animal SciencesUniversity of Illinois at Urbana‐ChampaignUrbanaILUSA
| | - Matthew R. Allen
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
- Department of Anatomy, Cell Biology, and PhysiologyIndiana University School of MedicineIndianapolisINUSA
| | - Sharon M. Moe
- Department of Medicine, Division of NephrologyIndiana University School of MedicineIndianapolisINUSA
- Department of Anatomy, Cell Biology, and PhysiologyIndiana University School of MedicineIndianapolisINUSA
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Rothé B, Ikawa Y, Zhang Z, Katoh TA, Kajikawa E, Minegishi K, Xiaorei S, Fortier S, Dal Peraro M, Hamada H, Constam DB. Bicc1 ribonucleoprotein complexes specifying organ laterality are licensed by ANKS6-induced structural remodeling of associated ANKS3. PLoS Biol 2023; 21:e3002302. [PMID: 37733651 PMCID: PMC10513324 DOI: 10.1371/journal.pbio.3002302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 08/17/2023] [Indexed: 09/23/2023] Open
Abstract
Organ laterality of vertebrates is specified by accelerated asymmetric decay of Dand5 mRNA mediated by Bicaudal-C1 (Bicc1) on the left side, but whether binding of this or any other mRNA to Bicc1 can be regulated is unknown. Here, we found that a CRISPR-engineered truncation in ankyrin and sterile alpha motif (SAM)-containing 3 (ANKS3) leads to symmetric mRNA decay mediated by the Bicc1-interacting Dand5 3' UTR. AlphaFold structure predictions of protein complexes and their biochemical validation by in vitro reconstitution reveal a novel interaction of the C-terminal coiled coil domain of ANKS3 with Bicc1 that inhibits binding of target mRNAs, depending on the conformation of ANKS3 and its regulation by ANKS6. The dual regulation of RNA binding by mutually opposing structured protein domains in this multivalent protein network emerges as a novel mechanism linking associated laterality defects and possibly other ciliopathies to perturbed dynamics in Bicc1 ribonucleoparticle (RNP) formation.
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Affiliation(s)
- Benjamin Rothé
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Lausanne, Switzerland
| | - Yayoi Ikawa
- Laboratory for Organismal Patterning, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Zhidian Zhang
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV IBI, Lausanne, Switzerland
| | - Takanobu A. Katoh
- Laboratory for Organismal Patterning, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Eriko Kajikawa
- Laboratory for Organismal Patterning, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Katsura Minegishi
- Department of Molecular Therapy, National Institutes of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan
| | - Sai Xiaorei
- Department of Molecular Therapy, National Institutes of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Tokyo, Japan
| | - Simon Fortier
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Lausanne, Switzerland
| | - Matteo Dal Peraro
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV IBI, Lausanne, Switzerland
| | - Hiroshi Hamada
- Laboratory for Organismal Patterning, RIKEN Center for Biosystems Dynamics Research, Kobe, Japan
| | - Daniel B. Constam
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Lausanne, Switzerland
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Rothé B, Fortier S, Gagnieux C, Schmuziger C, Constam DB. Antagonistic interactions among structured domains in the multivalent Bicc1-ANKS3-ANKS6 protein network govern phase transitioning of target mRNAs. iScience 2023; 26:106855. [PMID: 37275520 PMCID: PMC10232731 DOI: 10.1016/j.isci.2023.106855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 04/11/2023] [Accepted: 05/05/2023] [Indexed: 06/07/2023] Open
Abstract
The growing number of diseases linked to aberrant phase transitioning of ribonucleoproteins highlights the need to uncover how the interplay between multivalent protein and RNA interactions is regulated. Cytoplasmic granules of the RNA binding protein Bicaudal-C (Bicc1) are regulated by the ciliopathy proteins ankyrin (ANK) and sterile alpha motif (SAM) domain-containing ANKS3 and ANKS6, but whether and how target mRNAs are affected is unknown. Here, we show that head-to-tail polymers of Bicc1 nucleated by its SAM domain are interconnected by K homology (KH) domains in a protein meshwork that mediates liquid-to-gel transitioning of client transcripts. Moreover, while the dispersion of these granules by ANKS3 concomitantly released bound mRNAs, co-recruitment of ANKS6 by ANKS3 reinstated Bicc1 condensation and ribonucleoparticle assembly. RNA-independent Bicc1 polymerization and its dual regulation by ANKS3 and ANKS6 represent a new mechanism to couple the reversible immobilization of client mRNAs to controlled protein phase transitioning between distinct metastable states.
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Affiliation(s)
- Benjamin Rothé
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Simon Fortier
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Céline Gagnieux
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Céline Schmuziger
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Daniel B. Constam
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, 1015 Lausanne, Switzerland
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Biruete A, Chen NX, Metzger CE, Srinivasan S, O’Neill K, Fallen PB, Fonseca A, Wilson HE, de Loor H, Evenepoel P, Swanson KS, Allen MR, Moe SM. The Dietary Fermentable Fiber Inulin Alters the Intestinal Microbiome and Improves Chronic Kidney Disease Mineral-Bone Disorder in a Rat Model of CKD. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.29.526093. [PMID: 36778372 PMCID: PMC9915522 DOI: 10.1101/2023.01.29.526093] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Background Dietary fiber is important for a healthy diet, but intake is low in CKD patients and the impact this has on the manifestations of CKD-Mineral Bone Disorder (MBD) is unknown. Methods The Cy/+ rat with progressive CKD was fed a casein-based diet of 0.7% phosphate with 10% inulin (fermentable fiber) or cellulose (non-fermentable fiber) from 22 weeks to either 30 or 32 weeks of age (~30 and ~15 % of normal kidney function). We assessed CKD-MBD, cecal microbiota, and serum gut-derived uremic toxins. Two-way ANOVA was used to evaluate the effect of age and inulin diet, and their interaction. Results In CKD animals, dietary inulin led to changes in microbiota alpha and beta diversity at 30 and 32 weeks, with higher relative abundance of several taxa, including Bifidobacterium and Bacteroides , and lower Lactobacillus . Inulin reduced serum levels of gut-derived uremic toxins, phosphate, and parathyroid hormone, but not fibroblast growth factor-23. Dietary inulin decreased aorta and cardiac calcification and reduced left ventricular mass index and cardiac fibrosis. Bone turnover and cortical bone parameters were improved with inulin; however, bone mechanical properties were not altered. Conclusions The addition of the fermentable fiber inulin to the diet of CKD rats led to changes in the gut microbiota composition, lowered gut-derived uremic toxins, and improved most parameters of CKD-MBD. Future studies should assess this fiber as an additive therapy to other pharmacologic and diet interventions in CKD. Significance Statement Dietary fiber has well established beneficial health effects. However, the impact of fermentable dietary fiber on the intestinal microbiome and CKD-MBD is poorly understood. We used an animal model of progressive CKD and demonstrated that the addition of 10% of the fermentable fiber inulin to the diet altered the intestinal microbiota and lowered circulating gut-derived uremic toxins, phosphorus, and parathyroid hormone. These changes were associated with improved cortical bone parameters, lower vascular calcification, and reduced cardiac hypertrophy, fibrosis and calcification. Taken together, dietary fermentable fiber may be a novel additive intervention to traditional therapies of CKD-MBD.
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Biruete A, Metzger CE, Chen NX, Swallow EA, Vrabec C, Clinkenbeard EL, Stacy AJ, Srinivasan S, O'Neill K, Avin KG, Allen MR, Moe SM. Effects of ferric citrate and intravenous iron sucrose on markers of mineral, bone, and iron homeostasis in a rat model of CKD-MBD. Nephrol Dial Transplant 2022; 37:1857-1867. [PMID: 35482713 PMCID: PMC9494145 DOI: 10.1093/ndt/gfac162] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Anemia and chronic kidney disease-mineral and bone disorder (CKD-MBD) are common and begin early in CKD. Limited studies have concurrently compared the effects of ferric citrate (FC) versus intravenous (IV) iron on CKD-MBD and iron homeostasis in moderate CKD. METHODS We tested the effects of 10 weeks of 2% FC versus IV iron sucrose in rats with moderate CKD (Cy/+ male rat) and untreated normal (NL) littermates. Outcomes included a comprehensive assessment of CKD-MBD, iron homeostasis and oxidative stress. RESULTS CKD rats had azotemia, elevated phosphorus, parathyroid hormone and fibroblast growth factor-23 (FGF23). Compared with untreated CKD rats, treatment with FC led to lower plasma phosphorus, intact FGF23 and a trend (P = 0.07) toward lower C-terminal FGF23. FC and IV iron equally reduced aorta and heart calcifications to levels similar to NL animals. Compared with NL animals, CKD animals had higher bone turnover, lower trabecular volume and no difference in mineralization; these were unaffected by either iron treatment. Rats treated with IV iron had cortical and bone mechanical properties similar to NL animals. FC increased the transferrin saturation rate compared with untreated CKD and NL rats. Neither iron treatment increased oxidative stress above that of untreated CKD. CONCLUSIONS Oral FC improved phosphorus homeostasis, some iron-related parameters and the production and cleavage of FGF23. The intermittent effect of low-dose IV iron sucrose on cardiovascular calcification and bone should be further explored in moderate-advanced CKD.
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Affiliation(s)
- Annabel Biruete
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Nutrition and Dietetics, Indiana University-Purdue University Indianapolis, Indianapolis, IN, USA
| | - Corinne E Metzger
- Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Neal X Chen
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Elizabeth A Swallow
- Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Curtis Vrabec
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
- College of Osteopathic Medicine, Marian University, Indianapolis, IN, USA
| | - Erica L Clinkenbeard
- Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Alexander J Stacy
- Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Shruthi Srinivasan
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Kalisha O'Neill
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Keith G Avin
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Physical Therapy, Indiana University School of Health and Human Sciences, Indiana University, Indianapolis, IN, USA
| | - Matthew R Allen
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
- Roudebush Veterans Affairs Medical Center, Indianapolis, IN, IN, USA
| | - Sharon M Moe
- Division of Nephrology, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Anatomy, Cell Biology, and Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
- Roudebush Veterans Affairs Medical Center, Indianapolis, IN, IN, USA
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Abstract
RNA-binding proteins (RBPs) are of fundamental importance for post-transcriptional gene regulation and protein synthesis. They are required for pre-mRNA processing and for RNA transport, degradation and translation into protein, and can regulate every step in the life cycle of their RNA targets. In addition, RBP function can be modulated by RNA binding. RBPs also participate in the formation of ribonucleoprotein complexes that build up macromolecular machineries such as the ribosome and spliceosome. Although most research has focused on mRNA-binding proteins, non-coding RNAs are also regulated and sequestered by RBPs. Functional defects and changes in the expression levels of RBPs have been implicated in numerous diseases, including neurological disorders, muscular atrophy and cancers. RBPs also contribute to a wide spectrum of kidney disorders. For example, human antigen R has been reported to have a renoprotective function in acute kidney injury (AKI) but might also contribute to the development of glomerulosclerosis, tubulointerstitial fibrosis and diabetic kidney disease (DKD), loss of bicaudal C is associated with cystic kidney diseases and Y-box binding protein 1 has been implicated in the pathogenesis of AKI, DKD and glomerular disorders. Increasing data suggest that the modulation of RBPs and their interactions with RNA targets could be promising therapeutic strategies for kidney diseases.
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Airik M, Schüler M, McCourt B, Weiss AC, Herdman N, Lüdtke TH, Widmeier E, Stolz DB, Nejak-Bowen KN, Yimlamai D, Wu YL, Kispert A, Airik R, Hildebrandt F. Loss of Anks6 leads to YAP deficiency and liver abnormalities. Hum Mol Genet 2021; 29:3064-3080. [PMID: 32886109 PMCID: PMC7733532 DOI: 10.1093/hmg/ddaa197] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 07/03/2020] [Accepted: 08/27/2020] [Indexed: 12/17/2022] Open
Abstract
ANKS6 is a ciliary protein that localizes to the proximal compartment of the primary cilium, where it regulates signaling. Mutations in the ANKS6 gene cause multiorgan ciliopathies in humans, which include laterality defects of the visceral organs, renal cysts as part of nephronophthisis and congenital hepatic fibrosis (CHF) in the liver. Although CHF together with liver ductal plate malformations are common features of several human ciliopathy syndromes, including nephronophthisis-related ciliopathies, the mechanism by which mutations in ciliary genes lead to bile duct developmental abnormalities is not understood. Here, we generated a knockout mouse model of Anks6 and show that ANKS6 function is required for bile duct morphogenesis and cholangiocyte differentiation. The loss of Anks6 causes ciliary abnormalities, ductal plate remodeling defects and periportal fibrosis in the liver. Our expression studies and biochemical analyses show that biliary abnormalities in Anks6-deficient livers result from the dysregulation of YAP transcriptional activity in the bile duct-lining epithelial cells. Mechanistically, our studies suggest, that ANKS6 antagonizes Hippo signaling in the liver during bile duct development by binding to Hippo pathway effector proteins YAP1, TAZ and TEAD4 and promoting their transcriptional activity. Together, this study reveals a novel function for ANKS6 in regulating Hippo signaling during organogenesis and provides mechanistic insights into the regulatory network controlling bile duct differentiation and morphogenesis during liver development.
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Affiliation(s)
- Merlin Airik
- Division of Nephrology, Department of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Markus Schüler
- Division of Nephrology and Internal Intensive Care Medicine, Charite University, Berlin, Germany.,Division of Nephrology, Boston Children's Hospital, Boston, MA, USA
| | - Blake McCourt
- Division of Nephrology, Department of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Nathan Herdman
- Division of Nephrology, Department of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Eugen Widmeier
- Division of Nephrology, Boston Children's Hospital, Boston, MA, USA.,Department of Medicine, Renal Division, Medical Center - University of Freiburg, Freiburg, Germany
| | - Donna B Stolz
- Department of Cell Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Kari N Nejak-Bowen
- Division of Experimental Pathology, Department of Pathology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Dean Yimlamai
- Division of Gastroenterology and Nutrition, Department of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA
| | - Yijen L Wu
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, PA, USA
| | | | - Rannar Airik
- Division of Nephrology, Department of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Developmental Biology, University of Pittsburgh, Pittsburgh, PA, USA
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11
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Avilés-Pagán EE, Hara M, Orr-Weaver TL. The GNU subunit of PNG kinase, the developmental regulator of mRNA translation, binds BIC-C to localize to RNP granules. eLife 2021; 10:67294. [PMID: 34250903 PMCID: PMC8313231 DOI: 10.7554/elife.67294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 07/09/2021] [Indexed: 11/15/2022] Open
Abstract
Control of mRNA translation is a key mechanism by which the differentiated oocyte transitions to a totipotent embryo. In Drosophila, the PNG kinase complex regulates maternal mRNA translation at the oocyte-to-embryo transition. We previously showed that the GNU activating subunit is crucial in regulating PNG and timing its activity to the window between egg activation and early embryogenesis (Hara et al., 2017). In this study, we find associations between GNU and proteins of RNP granules and demonstrate that GNU localizes to cytoplasmic RNP granules in the mature oocyte, identifying GNU as a new component of a subset of RNP granules. Furthermore, we define roles for the domains of GNU. Interactions between GNU and the granule component BIC-C reveal potential conserved functions for translational regulation in metazoan development. We propose that by binding to BIC-C, upon egg activation GNU brings PNG to its initial targets, translational repressors in RNP granules.
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Affiliation(s)
- Emir E Avilés-Pagán
- Department of Biology, MIT, Cambridge, United States.,Whitehead Institute for Biomedical Research, Cambridge, United States
| | - Masatoshi Hara
- Whitehead Institute for Biomedical Research, Cambridge, United States
| | - Terry L Orr-Weaver
- Department of Biology, MIT, Cambridge, United States.,Whitehead Institute for Biomedical Research, Cambridge, United States
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12
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Stokman MF, Saunier S, Benmerah A. Renal Ciliopathies: Sorting Out Therapeutic Approaches for Nephronophthisis. Front Cell Dev Biol 2021; 9:653138. [PMID: 34055783 PMCID: PMC8155538 DOI: 10.3389/fcell.2021.653138] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 04/19/2021] [Indexed: 12/13/2022] Open
Abstract
Nephronophthisis (NPH) is an autosomal recessive ciliopathy and a major cause of end-stage renal disease in children. The main forms, juvenile and adult NPH, are characterized by tubulointerstitial fibrosis whereas the infantile form is more severe and characterized by cysts. NPH is caused by mutations in over 20 different genes, most of which encode components of the primary cilium, an organelle in which important cellular signaling pathways converge. Ciliary signal transduction plays a critical role in kidney development and tissue homeostasis, and disruption of ciliary signaling has been associated with cyst formation, epithelial cell dedifferentiation and kidney function decline. Drugs have been identified that target specific signaling pathways (for example cAMP/PKA, Hedgehog, and mTOR pathways) and rescue NPH phenotypes in in vitro and/or in vivo models. Despite identification of numerous candidate drugs in rodent models, there has been a lack of clinical trials and there is currently no therapy that halts disease progression in NPH patients. This review covers the most important findings of therapeutic approaches in NPH model systems to date, including hypothesis-driven therapies and untargeted drug screens, approached from the pathophysiology of NPH. Importantly, most animal models used in these studies represent the cystic infantile form of NPH, which is less prevalent than the juvenile form. It appears therefore important to develop new models relevant for juvenile/adult NPH. Alternative non-orthologous animal models and developments in patient-based in vitro model systems are discussed, as well as future directions in personalized therapy for NPH.
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Affiliation(s)
- Marijn F Stokman
- Department of Genetics, University Medical Center Utrecht, Utrecht, Netherlands
- Université de Paris, Imagine Institute, Laboratory of Inherited Kidney Diseases, INSERM UMR 1163, Paris, France
| | - Sophie Saunier
- Université de Paris, Imagine Institute, Laboratory of Inherited Kidney Diseases, INSERM UMR 1163, Paris, France
| | - Alexandre Benmerah
- Université de Paris, Imagine Institute, Laboratory of Inherited Kidney Diseases, INSERM UMR 1163, Paris, France
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13
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Chen NX, Srinivasan S, O’Neill K, Nickolas TL, Wallace JM, Allen MR, Metzger CE, Creecy A, Avin KG, Moe SM. Effect of Advanced Glycation End-Products (AGE) Lowering Drug ALT-711 on Biochemical, Vascular, and Bone Parameters in a Rat Model of CKD-MBD. J Bone Miner Res 2020; 35:608-617. [PMID: 31743501 PMCID: PMC9030558 DOI: 10.1002/jbmr.3925] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Revised: 11/04/2019] [Indexed: 12/12/2022]
Abstract
Chronic kidney disease-mineral bone disorder (CKD-MBD) is a systemic disorder that affects blood measures of bone and mineral homeostasis, vascular calcification, and bone. We hypothesized that the accumulation of advanced glycation end-products (AGEs) in CKD may be responsible for the vascular and bone pathologies via alteration of collagen. We treated a naturally occurring model of CKD-MBD, the Cy/+ rat, with a normal and high dose of the AGE crosslink breaker alagebrium (ALT-711), or with calcium in the drinking water to mimic calcium phosphate binders for 10 weeks. These animals were compared to normal (NL) untreated animals. The results showed that CKD animals, compared to normal animals, had elevated blood urea nitrogen (BUN), PTH, FGF23 and phosphorus. Treatment with ALT-711 had no effect on kidney function or PTH, but 3 mg/kg lowered FGF23 whereas calcium lowered PTH. Vascular calcification of the aorta assessed biochemically was increased in CKD animals compared to NL, and decreased by the normal, but not high dose of ALT-711, with parallel decreases in left ventricular hypertrophy. ALT-711 (3 mg/kg) did not alter aorta AGE content, but reduced aorta expression of receptor for advanced glycation end products (RAGE) and NADPH oxidase 2 (NOX2), suggesting effects related to decreased oxidative stress at the cellular level. The elevated total bone AGE was decreased by 3 mg/kg ALT-711 and both bone AGE and cortical porosity were decreased by calcium treatment, but only calcium improved bone properties. In summary, treatment of CKD-MBD with an AGE breaker ALT-711, decreased FGF23, reduced aorta calcification, and reduced total bone AGE without improvement of bone mechanics. These results suggest little effect of ALT-711 on collagen, but potential cellular effects. The data also highlights the need to better measure specific types of AGE proteins at the tissue level in order to fully elucidate the impact of AGEs on CKD-MBD. © 2019 American Society for Bone and Mineral Research.
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Affiliation(s)
- Neal X Chen
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Shruthi Srinivasan
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Kalisha O’Neill
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Thomas L Nickolas
- Division of Nephrology, Department of Medicine, Columbia University Medical Center, New York, NY, USA
| | - Joseph M Wallace
- Department of Biomedical Engineering, Indiana University-Purdue University at Indianapolis, Indianapolis, IN, USA
| | - Matthew R Allen
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Corinne E Metzger
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Amy Creecy
- Department of Biomedical Engineering, Indiana University-Purdue University at Indianapolis, Indianapolis, IN, USA
| | - Keith G Avin
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Physical Therapy, Indiana University School of Health and Rehabilitation Sciences, Indianapolis, IN, USA
| | - Sharon M Moe
- Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
- Department of Anatomy and Cell Biology, Indiana University School of Medicine, Indianapolis, IN, USA
- Roudebush Veterans Administration Medical Center, Indianapolis, IN, USA
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14
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Vincenzi M, Mercurio FA, Leone M. Sam Domains in Multiple Diseases. Curr Med Chem 2020; 27:450-476. [PMID: 30306850 DOI: 10.2174/0929867325666181009114445] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 07/26/2018] [Accepted: 08/27/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND The sterile alpha motif (Sam) domain is a small helical protein module, able to undergo homo- and hetero-oligomerization, as well as polymerization, thus forming different types of protein architectures. A few Sam domains are involved in pathological processes and consequently, they represent valuable targets for the development of new potential therapeutic routes. This study intends to collect state-of-the-art knowledge on the different modes by which Sam domains can favor disease onset and progression. METHODS This review was build up by searching throughout the literature, for: a) the structural properties of Sam domains, b) interactions mediated by a Sam module, c) presence of a Sam domain in proteins relevant for a specific disease. RESULTS Sam domains appear crucial in many diseases including cancer, renal disorders, cataracts. Often pathologies are linked to mutations directly positioned in the Sam domains that alter their stability and/or affect interactions that are crucial for proper protein functions. In only a few diseases, the Sam motif plays a kind of "side role" and cooperates to the pathological event by enhancing the action of a different protein domain. CONCLUSION Considering the many roles of the Sam domain into a significant variety of diseases, more efforts and novel drug discovery campaigns need to be engaged to find out small molecules and/or peptides targeting Sam domains. Such compounds may represent the pillars on which to build novel therapeutic strategies to cure different pathologies.
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Affiliation(s)
- Marian Vincenzi
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy
| | - Flavia Anna Mercurio
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone, 16, 80134 Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone, 16, 80134 Naples, Italy
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15
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Rothé B, Gagnieux C, Leal-Esteban LC, Constam DB. Role of the RNA-binding protein Bicaudal-C1 and interacting factors in cystic kidney diseases. Cell Signal 2019; 68:109499. [PMID: 31838063 DOI: 10.1016/j.cellsig.2019.109499] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 12/09/2019] [Accepted: 12/10/2019] [Indexed: 01/03/2023]
Abstract
Polycystic kidneys frequently associate with mutations in individual components of cilia, basal bodies or centriolar satellites that perturb complex protein networks. In this review, we focus on the RNA-binding protein Bicaudal-C1 (BICC1) which was found mutated in renal cystic dysplasia, and on its interactions with the ankyrin repeat and sterile α motif (SAM)-containing proteins ANKS3 and ANKS6 and associated kinases and their partially overlapping ciliopathy phenotypes. After reviewing BICC1 homologs in model organisms and their functions in mRNA and cell metabolism during development and in renal tubules, we discuss recent insights from cell-based assays and from structure analysis of the SAM domains, and how SAM domain oligomerization might influence multivalent higher order complexes that are implicated in ciliary signal transduction.
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Affiliation(s)
- Benjamin Rothé
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, CH-1015 Lausanne, Switzerland
| | - Céline Gagnieux
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, CH-1015 Lausanne, Switzerland
| | - Lucia Carolina Leal-Esteban
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, CH-1015 Lausanne, Switzerland; Center for Integrative Genomics, University of Lausanne, 1015 Lausanne, Switzerland
| | - Daniel B Constam
- Ecole Polytechnique Fédérale de Lausanne (EPFL) SV ISREC, Station 19, CH-1015 Lausanne, Switzerland.
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16
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Fang B, Guo J, Hao C, Guo R, Qian S, Li W, Jia X. Whole-exome sequencing identifies a novel compound heterozygous mutation of ANKS6 gene in a Chinese nephronophthisis patient. Clin Chim Acta 2019; 501:131-135. [PMID: 31678577 DOI: 10.1016/j.cca.2019.10.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 10/14/2019] [Accepted: 10/22/2019] [Indexed: 12/16/2022]
Abstract
BACKGROUND Nephronophthisis (NPHP) is an autosomal recessive cystic kidney disease that leads to renal failure in childhood or adolescence. NPHP and the related syndromes have been termed 'ciliopathies' because most NPHP gene products localize to the cilium or its associated structures. METHODS Here, we report a 2-year and 11-month-old Chinese girl with end-stage renal disease (ESRD), severe anemia, thrombocytopenia and myocardial hypertrophy. We performed trio-whole-exome sequencing to identify the causative variant of this patient. RESULTS We identified an unreported compound heterozygous mutation (c.2420dupT, p.Thr808Aspfs*2 and c.1973-1G > A) in ANKS6 in the proband. The frameshift mutation c.2420dupT of ANKS6 was inherited from the proband's unaffected father and the splicing mutation c.1973-1G > A of ANKS6 was inherited from the proband's unaffected mother. Homozygous mutation in ANKS6 leads to NPHP16 (OMIM#615382) and this is the first case with a compound heterozygous mutation in the NPHP16 gene. CONCLUSION We have identified a patient with ANKS6 variants in the East-Asian population for the first time. This case report expands the clinical and genetic spectra of NPHP and emphasizes the usefulness of whole-exome sequencing for genetic diagnosis of kidney disease.
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Affiliation(s)
- Boliang Fang
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China
| | - Jun Guo
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute, MOE Key Laboratory of Major Diseases in Children, Genetics and Birth Defects Control Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China; Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China
| | - Chanjuan Hao
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute, MOE Key Laboratory of Major Diseases in Children, Genetics and Birth Defects Control Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China; Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China
| | - Ruolan Guo
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute, MOE Key Laboratory of Major Diseases in Children, Genetics and Birth Defects Control Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China; Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China
| | - Suyun Qian
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China
| | - Wei Li
- Beijing Key Laboratory for Genetics of Birth Defects, Beijing Pediatric Research Institute, MOE Key Laboratory of Major Diseases in Children, Genetics and Birth Defects Control Center, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China; Henan Key Laboratory of Pediatric Inherited & Metabolic Diseases, Henan Children's Hospital, Zhengzhou Hospital of Beijing Children's Hospital, Zhengzhou, China.
| | - Xinlei Jia
- Pediatric Intensive Care Unit, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, China.
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17
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Avin KG, Allen MR, Chen NX, Srinivasan S, O'Neill KD, Troutman AD, Mast G, Swallow EA, Brown MB, Wallace JM, Zimmers TA, Warden SJ, Moe SM. Voluntary Wheel Running Has Beneficial Effects in a Rat Model of CKD-Mineral Bone Disorder (CKD-MBD). J Am Soc Nephrol 2019; 30:1898-1909. [PMID: 31501355 DOI: 10.1681/asn.2019040349] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 06/16/2019] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Reduced bone and muscle health in individuals with CKD contributes to their higher rates of morbidity and mortality. METHODS We tested the hypothesis that voluntary wheel running would improve musculoskeletal health in a CKD rat model. Rats with spontaneous progressive cystic kidney disease (Cy/+ IU) and normal littermates (NL) were given access to a voluntary running wheel or standard cage conditions for 10 weeks starting at 25 weeks of age when the rats with kidney disease had reached stage 2-3 of CKD. We then measured the effects of wheel running on serum biochemistry, tissue weight, voluntary grip strength, maximal aerobic capacity (VO2max), body composition and bone micro-CT and mechanics. RESULTS Wheel running improved serum biochemistry with decreased creatinine, phosphorous, and parathyroid hormone in the rats with CKD. It improved muscle strength, increased time-to-fatigue (for VO2max), reduced cortical porosity and improved bone microarchitecture. The CKD rats with voluntary wheel access also had reduced kidney cystic weight and reduced left ventricular mass index. CONCLUSIONS Voluntary wheel running resulted in multiple beneficial systemic effects in rats with CKD and improved their physical function. Studies examining exercise interventions in patients with CKD are warranted.
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Affiliation(s)
- Keith G Avin
- Division of Nephrology and .,Department of Physical Therapy, Indiana University School of Health and Human Sciences, Indianapolis, Indiana; and.,Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
| | - Matthew R Allen
- Division of Nephrology and.,Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana.,Departments of Medicine, Anatomy and Cell Biology, and
| | - Neal X Chen
- Division of Nephrology and.,Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
| | - Shruthi Srinivasan
- Division of Nephrology and.,Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
| | - Kalisha D O'Neill
- Division of Nephrology and.,Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
| | - Ashley D Troutman
- Department of Physical Therapy, Indiana University School of Health and Human Sciences, Indianapolis, Indiana; and
| | - Garrison Mast
- Departments of Medicine, Anatomy and Cell Biology, and
| | | | - Mary Beth Brown
- Department of Physical Therapy, Indiana University School of Health and Human Sciences, Indianapolis, Indiana; and
| | - Joseph M Wallace
- Division of Nephrology and.,Departments of Medicine, Anatomy and Cell Biology, and
| | - Teresa A Zimmers
- Medicine and General Surgery, Indiana University School of Medicine, Indianapolis, Indiana
| | - Stuart J Warden
- Department of Physical Therapy, Indiana University School of Health and Human Sciences, Indianapolis, Indiana; and.,Departments of Medicine, Anatomy and Cell Biology, and
| | - Sharon M Moe
- Division of Nephrology and.,Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana.,Departments of Medicine, Anatomy and Cell Biology, and
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18
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Nakajima Y, Kiyonari H, Mukumoto Y, Yokoyama T. The Inv compartment of renal cilia is an intraciliary signal-activating center to phosphorylate ANKS6. Kidney Int 2018; 93:1108-1117. [DOI: 10.1016/j.kint.2017.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 10/26/2017] [Accepted: 11/09/2017] [Indexed: 12/28/2022]
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19
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Rothé B, Leettola CN, Leal-Esteban L, Cascio D, Fortier S, Isenschmid M, Bowie JU, Constam DB. Crystal Structure of Bicc1 SAM Polymer and Mapping of Interactions between the Ciliopathy-Associated Proteins Bicc1, ANKS3, and ANKS6. Structure 2018; 26:209-224.e6. [PMID: 29290488 PMCID: PMC6258031 DOI: 10.1016/j.str.2017.12.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Revised: 10/31/2017] [Accepted: 12/01/2017] [Indexed: 01/25/2023]
Abstract
Head-to-tail polymers of sterile alpha motifs (SAM) can scaffold large macromolecular complexes. Several SAM-domain proteins that bind each other are mutated in patients with cystic kidneys or laterality defects, including the Ankyrin (ANK) and SAM domain-containing proteins ANKS6 and ANKS3, and the RNA-binding protein Bicc1. To address how their interactions are regulated, we first determined a high-resolution crystal structure of a Bicc1-SAM polymer, revealing a canonical SAM polymer with a high degree of flexibility in the subunit interface orientations. We further mapped interactions between full-length and distinct domains of Bicc1, ANKS3, and ANKS6. Neither ANKS3 nor ANKS6 alone formed macroscopic homopolymers in vivo. However, ANKS3 recruited ANKS6 to Bicc1, and the three proteins together cooperatively generated giant macromolecular complexes. Thus, the giant assemblies are shaped by SAM domains, their flanking sequences, and SAM-independent protein-protein and protein-mRNA interactions.
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Affiliation(s)
- Benjamin Rothé
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Catherine N Leettola
- Department of Chemistry and Biochemistry, UCLA-DOE Institute of Genomics and Proteomics, Molecular Biology Institute, University of California, Los Angeles, Boyer Hall, 611 Charles E. Young Drive East, Los Angeles, CA 90095-1570, USA
| | - Lucia Leal-Esteban
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Duilio Cascio
- Department of Chemistry and Biochemistry, UCLA-DOE Institute of Genomics and Proteomics, Molecular Biology Institute, University of California, Los Angeles, Boyer Hall, 611 Charles E. Young Drive East, Los Angeles, CA 90095-1570, USA
| | - Simon Fortier
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - Manuela Isenschmid
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, SV ISREC, Station 19, 1015 Lausanne, Switzerland
| | - James U Bowie
- Department of Chemistry and Biochemistry, UCLA-DOE Institute of Genomics and Proteomics, Molecular Biology Institute, University of California, Los Angeles, Boyer Hall, 611 Charles E. Young Drive East, Los Angeles, CA 90095-1570, USA
| | - Daniel B Constam
- Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Life Sciences, SV ISREC, Station 19, 1015 Lausanne, Switzerland.
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20
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Delestré L, Bakey Z, Prado C, Hoffmann S, Bihoreau MT, Lelongt B, Gauguier D. ANKS3 Co-Localises with ANKS6 in Mouse Renal Cilia and Is Associated with Vasopressin Signaling and Apoptosis In Vivo in Mice. PLoS One 2015; 10:e0136781. [PMID: 26327442 PMCID: PMC4556665 DOI: 10.1371/journal.pone.0136781] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Accepted: 08/07/2015] [Indexed: 02/07/2023] Open
Abstract
Mutations in Ankyrin repeat and sterile alpha motif domain containing 6 (ANKS6) play a causative role in renal cyst formation in the PKD/Mhm(cy/+) rat model of polycystic kidney disease and in nephronophthisis in humans. A network of protein partners of ANKS6 is emerging and their functional characterization provides important clues to understand the role of ANKS6 in renal biology and in mechanisms involved in the formation of renal cysts. Following experimental confirmation of interaction between ANKS6and ANKS3 using a Yeast two hybrid system, we demonstrated that binding between the two proteins occurs through their sterile alpha motif (SAM) and that the amino acid 823 in rat ANSK6 is key for this interaction. We further showed their interaction by co-immunoprecipitation and showed in vivo in mice that ANKS3 is present in renal cilia. Downregulated expression of Anks3 in vivo in mice by Locked Nucleic Acid (LNA) modified antisense oligonucleotides was associated with increased transcription of vasopressin-induced genes, suggesting changes in renal water permeability, and altered transcription of genes encoding proteins involved in cilium structure, apoptosis and cell proliferation. These data provide experimental evidence of ANKS3-ANKS6 direct interaction through their SAM domain and co-localisation in mouse renal cilia, and shed light on molecular mechanisms indirectly mediated by ANKS6 in the mouse kidney, that may be affected by altered ANKS3-ANKS6 interaction. Our results contribute to improved knowledge of the structure and function of the network of proteins interacting with ANKS6, which may represent therapeutic targets in cystic diseases.
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Affiliation(s)
- Laure Delestré
- Sorbonne Universities, University Pierre and Marie Curie, University Paris Descartes, Sorbonne Paris Cité, INSERM, UMR_S1138, Cordeliers Research Centre, Paris, France
| | - Zeineb Bakey
- Sorbonne Universities, University Pierre and Marie Curie, UMR_S1155, Paris, France
- INSERM, UMR_S1155 Hôpital Tenon, Paris, France
| | - Cécilia Prado
- Sorbonne Universities, University Pierre and Marie Curie, University Paris Descartes, Sorbonne Paris Cité, INSERM, UMR_S1138, Cordeliers Research Centre, Paris, France
| | - Sigrid Hoffmann
- Medical Research Centre, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | | | - Brigitte Lelongt
- Sorbonne Universities, University Pierre and Marie Curie, UMR_S1155, Paris, France
- INSERM, UMR_S1155 Hôpital Tenon, Paris, France
| | - Dominique Gauguier
- Sorbonne Universities, University Pierre and Marie Curie, University Paris Descartes, Sorbonne Paris Cité, INSERM, UMR_S1138, Cordeliers Research Centre, Paris, France
- Institute of Cardiometabolism & Nutrition, Pitié-Salpêtrière Hospital, University Pierre and Marie-Curie, Paris, France
- * E-mail:
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