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Rioux AV, Nsimba-Batomene TR, Slimani S, Bergeron NA, Gravel MA, Schreiber SV, Fiola MJ, Haydock L, Garneau AP, Isenring P. Navigating the Multifaceted Intricacies of the Na +-Cl - cotransporter, a Highly Regulated and Key Effector in the Control of Hydromineral Homeostasis. Physiol Rev 2024. [PMID: 38329422 DOI: 10.1152/physrev.00027.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Accepted: 02/03/2024] [Indexed: 02/09/2024] Open
Abstract
The Na+-Cl- cotransporter (NCC; SLC12A3) is a highly regulated integral membrane protein that is known to exist as 3 splice variants in primates. Its primary role in the kidney is to mediate the cosymport of Na+ and Cl- across the apical membrane of the distal convoluted tubule. Through this role and the involvement of other ion transport systems, NCC allows the systemic circulation to reclaim a fraction of the ultrafiltered Na+, K+, Cl- and Mg+ loads in exchange for Ca2+ and HCO3-. The physiological relevance of the Na+-Cl- cotransport mechanism in human is illustrated by the several abnormalities that result from NCC inactivation through the administration of thiazides or in the setting of hereditary disorders. The purpose of the current review is to discuss the molecular mechanisms and overall roles of Na+-Cl- cotransport as the main topics of interest. On reading the narrative proposed, one will realize that the knowledge gained in regard to these themes will continue to progress unrelentingly no matter how refined it has now become.
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Affiliation(s)
| | | | | | | | | | | | - Marie-Jeanne Fiola
- MÃ{copyright, serif}decine, Université Laval, QuÃ{copyright, serif}bec, QuÃ{copyright, serif}bec, Canada
| | | | | | - Paul Isenring
- MÃ{copyright, serif}dicine, Université Laval, QuÃ{copyright, serif}bec, QuÃ{copyright, serif}bec, Canada
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2
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Rioux AV, Bergeron NA, Riopel J, Marcoux N, Thériault C, Gould PV, Garneau AP, Isenring P. The ever wider clinical spectrum of RMND1-related disorders and limitedness of phenotype-based classifications. J Mol Med (Berl) 2023; 101:1229-1236. [PMID: 37584739 PMCID: PMC10560146 DOI: 10.1007/s00109-023-02356-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 07/10/2023] [Accepted: 08/02/2023] [Indexed: 08/17/2023]
Abstract
RMND1 has been identified as a mitochondriopathy-associated gene less than 12 years ago. The most common phenotype related to this gene is an early onset, severe form of encephalomyopathy that leads to death in a medium time of three years after birth. However, milder and later onset presentations have been reported in some individuals, including two in whom the mitochondriopathy was identified at ~ 40 years of age, and the early onset presentations have been the object of no reports in those who survived beyond age 10. It is thus unclear how lethal RMND1-related conditions really are. We herein describe the oldest case to have been identified hitherto with this condition, i.e., that of a white female who was 61 at the time of diagnosis but was still active in her everyday life. The gene defect identified was nonetheless associated with many manifestations including ovarian insufficiency and sensorineural hearing loss (two features of what is currently designated as Perrault syndrome) as well as chronic renal failure, asymptomatic myopathy, leukopenia, and a few others. In our opinion, this case is of great translational interest for at least three reasons. First, it hints towards the possibility of near-normal life expectancies in some if not many individuals with RMND1 insufficiency. Second, it underlines the wide clinical spectrum associated with this gene. Third, it brings us to question the use of eponyms and syndromic features to identify the true etiology of multisystemic phenotypes. KEY MESSAGES: RMND1-related conditions typically manifest at an early age with a progressive and lethal form of encephalomyopathy. More benign presentations have been described with some being categorized as Perrault syndrome but none have been diagnosed after the age of 45. The clinical spectrum and presenting age of RMND1-related mitochondriopathies are probably much more varied than implied in the current literature. The case reported in this manuscript illustrates the limitedness of phenotype-based classifications of genetic disorders to identify the defect at cause.
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Affiliation(s)
- Alexis V Rioux
- CHU de Québec, Service of Nephrology, Faculty of Medicine, Université Laval, QC, G1R 2J6, Québec, Canada
| | - Nicolas Ad Bergeron
- CHU de Québec, Service of Nephrology, Faculty of Medicine, Université Laval, QC, G1R 2J6, Québec, Canada
| | - Julie Riopel
- CHU de Québec, Service of Pathology, Faculty of Medicine, Université Laval, Québec, QC, G1R 2J6, Canada
| | - Nicolas Marcoux
- CHU de Québec, Service of Hematology, Faculty of Medicine, Université Laval, Québec, QC, G1R 2J6, Canada
| | - Catherine Thériault
- CHU de Québec, Service of Pathology, Faculty of Medicine, Université Laval, Québec, QC, G1R 2J6, Canada
| | - Peter V Gould
- CHU de Québec, Service of Pathology, Faculty of Medicine, Université Laval, Québec, QC, G1R 2J6, Canada
| | - Alexandre P Garneau
- Service de Néphrologie-Transplantation Rénale Adultes, Hôpital Necker‑Enfants Malades, AP‑HP, Inserm U1151, Université Paris Cité, rue de Sèvres, Paris, France
| | - Paul Isenring
- CHU de Québec, Service of Nephrology, Faculty of Medicine, Université Laval, QC, G1R 2J6, Québec, Canada.
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3
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Ladraa S, Zerbib L, Bayard C, Fraissenon A, Venot Q, Morin G, Garneau AP, Isnard P, Chapelle C, Hoguin C, Fraitag S, Duong JP, Guibaud L, Besançon A, Kaltenbach S, Villarese P, Asnafi V, Broissand C, Goudin N, Dussiot M, Nemazanyy I, Viel T, Autret G, Cruciani-Guglielmacci C, Denom J, Bruneau J, Tavitian B, Legendre C, Dairou J, Lacorte JM, Levy P, Pende M, Polak M, Canaud G. PIK3CA gain-of-function mutation in adipose tissue induces metabolic reprogramming with Warburg-like effect and severe endocrine disruption. Sci Adv 2022; 8:eade7823. [PMID: 36490341 PMCID: PMC9733923 DOI: 10.1126/sciadv.ade7823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 11/03/2022] [Indexed: 06/17/2023]
Abstract
PIK3CA-related overgrowth syndrome (PROS) is a genetic disorder caused by somatic mosaic gain-of-function mutations of PIK3CA. Clinical presentation of patients is diverse and associated with endocrine disruption. Adipose tissue is frequently involved, but its role in disease development and progression has not been elucidated. Here, we created a mouse model of PIK3CA-related adipose tissue overgrowth that recapitulates patient phenotype. We demonstrate that PIK3CA mutation leads to GLUT4 membrane accumulation with a negative feedback loop on insulin secretion, a burst of liver IGFBP1 synthesis with IGF-1 sequestration, and low circulating levels. Mouse phenotype was mainly driven through AKT2. We also observed that PIK3CA mutation induces metabolic reprogramming with Warburg-like effect and protein and lipid synthesis, hallmarks of cancer cells, in vitro, in vivo, and in patients. We lastly show that alpelisib is efficient at preventing and improving PIK3CA-adipose tissue overgrowth and reversing metabolomic anomalies in both animal models and patients.
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Affiliation(s)
- Sophia Ladraa
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Lola Zerbib
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Charles Bayard
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Antoine Fraissenon
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
- Service d’Imagerie Pédiatrique, Hôpital Femme-Mère-Enfant, HCL, Bron, France
- CREATIS UMR 5220, Villeurbanne 69100, France
- Service de Radiologie Mère-Enfant, Hôpital Nord, Saint Etienne, France
| | - Quitterie Venot
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Gabriel Morin
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Alexandre P. Garneau
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Pierre Isnard
- Université Paris Cité, Paris, France
- Service d’Anatomie pathologique, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Célia Chapelle
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Clément Hoguin
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
- Unité de médecine translationnelle et thérapies ciblées, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Sylvie Fraitag
- Service d’Anatomie pathologique, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Jean-Paul Duong
- Université Paris Cité, Paris, France
- Service d’Anatomie pathologique, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Laurent Guibaud
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
- Service d’Imagerie Pédiatrique, Hôpital Femme-Mère-Enfant, HCL, Bron, France
| | - Alix Besançon
- Université Paris Cité, Paris, France
- Service d’Endocrinologie, Gynécologie et Diabétologie Pédiatrique, Centre des maladies endocriniennes rares de la croissance et du développement, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Sophie Kaltenbach
- Université Paris Cité, Paris, France
- Laboratoire d’Oncohématologie, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Patrick Villarese
- Laboratoire d’Oncohématologie, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Vahid Asnafi
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
- Laboratoire d’Oncohématologie, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | | | - Nicolas Goudin
- Necker Bio-Image Analysis, INSERM US24/CNRS UMS 3633, Paris, France
| | - Michael Dussiot
- Université Paris Cité, Paris, France
- INSERM U1163, Laboratory of Cellular and Molecular Mechanisms of Hematological Disorders and Therapeutic Implications, Laboratoire d’Excellence GR-Ex, Paris, France
| | - Ivan Nemazanyy
- Platform for Metabolic Analyses, Structure Fédérative de Recherche Necker, INSERM US24/CNRS UMS 3633, Paris, France
| | - Thomas Viel
- Plateforme Imageries du Vivant, Université de Paris, PARCC, INSERM, Paris, France
| | - Gwennhael Autret
- Plateforme Imageries du Vivant, Université de Paris, PARCC, INSERM, Paris, France
| | | | - Jessica Denom
- Université Paris Cité, Paris, France
- Unité de Biologie Fonctionnelle et Adaptative, CNRS, Paris, France
| | - Julie Bruneau
- Université Paris Cité, Paris, France
- Service d’Anatomie pathologique, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Bertrand Tavitian
- Université Paris Cité, Paris, France
- Plateforme Imageries du Vivant, Université de Paris, PARCC, INSERM, Paris, France
| | - Christophe Legendre
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
- Service de Néphrologie, Transplantation Adultes, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Julien Dairou
- Université Paris Cité, Paris, France
- Laboratoire de Chimie et de Biochimie Pharmacologiques et Toxicologiques, CNRS, Paris, France
| | - Jean-Marc Lacorte
- Laboratoire de Biochimie Endocrinienne et Oncologique, Hôpital La Pitié Salpêtrière, AP-HP, Paris, France
- Sorbonne Université, Paris, France
| | - Pacifique Levy
- Laboratoire de Biochimie Endocrinienne et Oncologique, Hôpital La Pitié Salpêtrière, AP-HP, Paris, France
| | - Mario Pende
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
| | - Michel Polak
- Université Paris Cité, Paris, France
- Service d’Endocrinologie, Gynécologie et Diabétologie Pédiatrique, Centre des maladies endocriniennes rares de la croissance et du développement, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
| | - Guillaume Canaud
- Université Paris Cité, Paris, France
- INSERM U1151, Institut Necker-Enfants Malades, Paris, France
- Unité de médecine translationnelle et thérapies ciblées, Hôpital Necker-Enfants Malades, AP-HP, Paris, France
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Garneau AP, Slimani S, Haydock L, Nsimba-Batomene TR, Préfontaine FCM, Lavoie MM, Tremblay LE, Fiola MJ, Mac-Way F, Isenring P. Molecular mechanisms, physiological roles, and therapeutic implications of ion fluxes in bone cells: Emphasis on the cation-Cl - cotransporters. J Cell Physiol 2022; 237:4356-4368. [PMID: 36125923 PMCID: PMC10087713 DOI: 10.1002/jcp.30879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 08/25/2022] [Accepted: 09/01/2022] [Indexed: 11/11/2022]
Abstract
Bone turnover diseases are exceptionally prevalent in human and come with a high burden on physical health. While these diseases are associated with a variety of risk factors and causes, they are all characterized by common denominators, that is, abnormalities in the function or number of osteoblasts, osteoclasts, and/or osteocytes. As such, much effort has been deployed in the recent years to understand the signaling mechanisms of bone cell proliferation and differentiation with the objectives of exploiting the intermediates involved as therapeutic preys. Ion transport systems at the external and in the intracellular membranes of osteoblasts and osteoclasts also play an important role in bone turnover by coordinating the movement of Ca2+ , PO4 2- , and H+ ions in and out of the osseous matrix. Even if they sustain the terminal steps of osteoformation and osteoresorption, they have been the object of very little attention in the last several years. Members of the cation-Cl- cotransporter (CCC) family are among the systems at work as they are expressed in bone cells, are known to affect the activity of Ca2+ -, PO4 2- -, and H+ -dependent transport systems and have been linked to bone mass density variation in human. In this review, the roles played by the CCCs in bone remodeling will be discussed in light of recent developments and their potential relevance in the treatment of skeletal disorders.
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Affiliation(s)
- Alexandre P Garneau
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada.,Service de Néphrologie-Transplantation Rénale Adultes, Hôpital Necker-Enfants Malades, AP-HP, Inserm U1151, Université Paris Cité, rue de Sèvres, Paris, France
| | - Samira Slimani
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
| | - Ludwig Haydock
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
| | | | | | - Mathilde M Lavoie
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
| | - Laurence E Tremblay
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
| | - Marie-Jeanne Fiola
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
| | - Fabrice Mac-Way
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
| | - Paul Isenring
- Department of Medicine, Nephrology Research Group, Laval University, Québec, Québec, Canada
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5
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Garneau AP, Haydock L, Tremblay LE, Harvey-Michaud PL, Hsiao YHE, Strom SP, Canaud G, Isenring P. Somatic non-cancerous overgrowth syndrome of obscure molecular etiology: what are the causes and options? J Mol Med (Berl) 2022; 100:1087-1090. [PMID: 35657398 PMCID: PMC9213277 DOI: 10.1007/s00109-022-02214-2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Revised: 05/11/2022] [Accepted: 05/18/2022] [Indexed: 11/12/2022]
Affiliation(s)
- Alexandre P Garneau
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L'Hôtel-Dieu de Québec du CHU de Québec, Laval University, Quebec City, Québec, G1R 2J6, Canada.,Unité d'hypercroissance dysharmonieuse, Hôpital Necker-Enfants Malades, AP-HP, Inserm U1151, Université de Paris, rue de Sèvres, 75105, Paris, France
| | - Ludwig Haydock
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L'Hôtel-Dieu de Québec du CHU de Québec, Laval University, Quebec City, Québec, G1R 2J6, Canada
| | - Laurence E Tremblay
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L'Hôtel-Dieu de Québec du CHU de Québec, Laval University, Quebec City, Québec, G1R 2J6, Canada
| | - Pierre-Luc Harvey-Michaud
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L'Hôtel-Dieu de Québec du CHU de Québec, Laval University, Quebec City, Québec, G1R 2J6, Canada
| | | | | | - Guillaume Canaud
- Unité d'hypercroissance dysharmonieuse, Hôpital Necker-Enfants Malades, AP-HP, Inserm U1151, Université de Paris, rue de Sèvres, 75105, Paris, France
| | - Paul Isenring
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L'Hôtel-Dieu de Québec du CHU de Québec, Laval University, Quebec City, Québec, G1R 2J6, Canada.
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Quigley N, Garneau AP, Haydock L, Isenring P. Extreme Hyponatremia Complicated by Osmotic Demyelination in a Previously Healthy Young Individual. Can J Kidney Health Dis 2022; 9:20543581221130686. [DOI: 10.1177/20543581221130686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 08/09/2022] [Indexed: 11/16/2022] Open
Abstract
Rationale: Severe hyponatremia can lead to dramatic complications whether it is treated or not. At times, it may be very severe (serum Na concentration: NaS < 115 mmol/L) or even extreme (NaS < 105 mmol/L)a and its cause difficult to identify, especially in younger individuals with no history of water disorders. The case presented herein illustrates these points quite eloquently and leads us to believe that the current recommendations for the treatment of very severe hyponatremia require some fine-tuning. Presenting Concerns: A 26-year-old man was admitted to our intensive care unit for a NaS of 88 mmol/L in the absence of obvious extracellular fluid volume contraction. He had been experiencing vomiting, diarrhea, fatigue, and excessive thirst for the past 6 weeks and minor neurological symptoms just before admission. Laboratory tests at presentation also showed a urine osmolarity of 697 mOsm/L and urine Na of 40 mmol/L. Diagnoses: The presenting concerns were consistent with syndrome of inappropriate antidiuretic hormone secretion (SIADH) manifesting as extreme, yet mildly symptomatic hyponatremia. At the same time, they did not point toward a specific cause initially. Interventions: The patient was treated through water restriction, subcutaneous desmopressin, and various intravenous (IV) fluids. Our goal had been to increase NaS at a rate of 4 to 6 mmol/L/day and required the amount of NaCl and free water perfused hourly to be readjusted constantly. Access to water also had to be opposed as the patient was unable to tolerate his thirst. Outcomes: During the first 6 days, the rate of NaS correction achieved was ~6 mmol/L/day. The patient improved initially but at the end of day 6, he experienced severe extrapontine osmotic demyelination (with widespread pyramidal and extrapyramidal deficits) that did not respond to intravenous immunoglobulin and NaS relowering. A little more than 3 weeks later, he began to develop low blood pressure and a subfebrile state that revealed secondary to severe Addison disease. The water disorder and insatiable thirst subsided gradually upon replacing the deficient hormones but the neurological disorder went on to become permanent and highly disabling. Teaching points: (1) Very severe hyponatremia should always be handled as an emergency and monitored stringently in view of its potential to cause irreparable damage. (2) Because it is a major risk factor for osmotic demyelination, it should probably be corrected at a rate of less than 4 mmol/L/day especially if it is in the extreme range, chronic, or of unknown duration. (3) It can be a presenting manifestation of Addison disease.
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Affiliation(s)
- Nicholas Quigley
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L’Hôtel-Dieu de Quebec du CHU de Québec, Laval University, Quebec City, Quebec, Canada
| | - Alexandre P. Garneau
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L’Hôtel-Dieu de Quebec du CHU de Québec, Laval University, Quebec City, Quebec, Canada
- Service de Néphrologie—Transplantation rénale adultes, Hôpital Necker‑Enfants malades, AP-HP, Inserm U1151, Université Paris Cité, rue de Sèvres, Paris, France
| | - Ludwig Haydock
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L’Hôtel-Dieu de Quebec du CHU de Québec, Laval University, Quebec City, Quebec, Canada
| | - Paul Isenring
- Nephrology Research Group, Department of Medicine, Faculty of Medicine, L’Hôtel-Dieu de Quebec du CHU de Québec, Laval University, Quebec City, Quebec, Canada
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7
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Marcoux AA, Tremblay LE, Slimani S, Fiola MJ, Mac-Way F, Haydock L, Garneau AP, Isenring P. Anatomophysiology of the Henle's Loop: Emphasis on the Thick Ascending Limb. Compr Physiol 2021; 12:3119-3139. [PMID: 34964111 DOI: 10.1002/cphy.c210021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The loop of Henle plays a variety of important physiological roles through the concerted actions of ion transport systems in both its apical and basolateral membranes. It is involved most notably in extracellular fluid volume and blood pressure regulation as well as Ca2+ , Mg2+ , and acid-base homeostasis because of its ability to reclaim a large fraction of the ultrafiltered solute load. This nephron segment is also involved in urinary concentration by energizing several of the steps that are required to generate a gradient of increasing osmolality from cortex to medulla. Another important role of the loop of Henle is to sustain a process known as tubuloglomerular feedback through the presence of specialized renal tubular cells that lie next to the juxtaglomerular arterioles. This article aims at describing these physiological roles and at discussing a number of the molecular mechanisms involved. It will also report on novel findings and uncertainties regarding the realization of certain processes and on the pathophysiological consequences of perturbed salt handling by the thick ascending limb of the loop of Henle. Since its discovery 150 years ago, the loop of Henle has remained in the spotlight and is now generating further interest because of its role in the renal-sparing effect of SGLT2 inhibitors. © 2022 American Physiological Society. Compr Physiol 12:1-21, 2022.
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Affiliation(s)
- Andrée-Anne Marcoux
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
| | - Laurence E Tremblay
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
| | - Samira Slimani
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
| | - Marie-Jeanne Fiola
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
| | - Fabrice Mac-Way
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
| | - Ludwig Haydock
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
| | - Alexandre P Garneau
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada.,Cardiometabolic Axis, School of Kinesiology and Physical Activity Sciences, University of Montréal, Montréal, QC, Canada
| | - Paul Isenring
- Nephrology Research Group, Department of Medicine, Laval University, Québec, QC, Canada
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8
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Haydock L, Garneau AP, Tremblay L, Yen HY, Gao H, Harrisson R, Isenring P. Genetic abnormalities in biopsy-proven, adult-onset hemolytic uremic syndrome and C3 glomerulopathy. J Mol Med (Berl) 2021; 100:269-284. [PMID: 34714369 PMCID: PMC8770394 DOI: 10.1007/s00109-021-02102-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 06/03/2021] [Accepted: 06/08/2021] [Indexed: 12/25/2022]
Abstract
Abstract Atypical hemolytic uremic syndrome (aHUS) and C3 glomerulopathy (C3G) have been linked to mutations in many of the proteins that are involved in alternative complement pathway activation. Age and etiology confounded, the prevalence of such mutations has been reported to be over 30 to 50% in these diseases. However, the cohorts studied included many children or individuals with a familial history of complement-related disorders and genetic tests were usually limited to exome sequencing of known causative or risk-associated genes. In this study, a retrospective adult cohort of 35 patients with biopsy-proven thrombotic microangiopathy (the largest in Canada) and 10 patients with C3 glomerulopathy was tested through an extended exome panel to identify causative defects in associated or candidate genes including those of the alternative and terminal complement pathways. A variant of unknown significance was also analyzed for pathogenicity through in vitro studies. To our surprise, the prevalence of known causative or risk-associated variants in either of these cohorts was found to be less than ~ 15% overall. However, the panel used and analyses carried out allowed to identify novel variants of potential clinical significance and a number of candidate genes. The prevalence of known genetic defects in adult-onset aHUS and C3G is thus probably much lower than 30 to 50%. Our results also point towards the importance of investigating diseases of the alternative complement pathway through extended exome panels and in vitro analyses. Key messages The alternative complement pathway plays a major role in the pathogenesis of hemolytic uremic syndrome and C3 glomerulopathy. Based on previous studies, both disorders have been commonly linked to variants in the various intermediates that sustain or regulate this pathway. The prevalence of such mutations in the adult-onset and sporadic forms of these diseases is probably much lower than expected based on larger series. The sporadic forms of complementopathies are likely to involve additional genes that are yet to be uncovered.
Supplementary information The online version contains supplementary material available at 10.1007/s00109-021-02102-1.
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Affiliation(s)
- Ludwig Haydock
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Quebec, QC, G1R2J6, Canada
| | - Alexandre P Garneau
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Quebec, QC, G1R2J6, Canada.,Cardiometabolic Axis, School of Kinesiology and Physical Activity Sciences, Faculty of Medicine, University of Montréal, 900, rue Saint-Denis, Montreal, QC, H2X 0A9, Canada
| | - Laurence Tremblay
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Quebec, QC, G1R2J6, Canada
| | - Hai-Yun Yen
- Fulgent Genetics, Temple City, CA, 91780, USA
| | - Hanlin Gao
- Fulgent Genetics, Temple City, CA, 91780, USA
| | - Raphaël Harrisson
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Quebec, QC, G1R2J6, Canada
| | - Paul Isenring
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Quebec, QC, G1R2J6, Canada.
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9
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Chi G, Ebenhoch R, Man H, Tang H, Tremblay LE, Reggiano G, Qiu X, Bohstedt T, Liko I, Almeida FG, Garneau AP, Wang D, McKinley G, Moreau CP, Bountra KD, Abrusci P, Mukhopadhyay SMM, Fernandez‐Cid A, Slimani S, Lavoie JL, Burgess‐Brown NA, Tehan B, DiMaio F, Jazayeri A, Isenring P, Robinson CV, Dürr KL. Phospho-regulation, nucleotide binding and ion access control in potassium-chloride cotransporters. EMBO J 2021; 40:e107294. [PMID: 34031912 PMCID: PMC8280820 DOI: 10.15252/embj.2020107294] [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: 11/12/2020] [Revised: 03/29/2021] [Accepted: 04/11/2021] [Indexed: 11/26/2022] Open
Abstract
Potassium-coupled chloride transporters (KCCs) play crucial roles in regulating cell volume and intracellular chloride concentration. They are characteristically inhibited under isotonic conditions via phospho-regulatory sites located within the cytoplasmic termini. Decreased inhibitory phosphorylation in response to hypotonic cell swelling stimulates transport activity, and dysfunction of this regulatory process has been associated with various human diseases. Here, we present cryo-EM structures of human KCC3b and KCC1, revealing structural determinants for phospho-regulation in both N- and C-termini. We show that phospho-mimetic KCC3b is arrested in an inward-facing state in which intracellular ion access is blocked by extensive contacts with the N-terminus. In another mutant with increased isotonic transport activity, KCC1Δ19, this interdomain interaction is absent, likely due to a unique phospho-regulatory site in the KCC1 N-terminus. Furthermore, we map additional phosphorylation sites as well as a previously unknown ATP/ADP-binding pocket in the large C-terminal domain and show enhanced thermal stabilization of other CCCs by adenine nucleotides. These findings provide fundamentally new insights into the complex regulation of KCCs and may unlock innovative strategies for drug development.
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Affiliation(s)
- Gamma Chi
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | - Rebecca Ebenhoch
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
- Present address:
MedChem, Boehringer Ingelheim Pharma GmbH & Co. KGBiberachGermany
| | - Henry Man
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
- Present address:
Exscientia LtdOxfordUK
| | - Haiping Tang
- Physical and Theoretical Chemistry LaboratoryUniversity of OxfordOxfordUK
| | - Laurence E Tremblay
- Department of MedicineNephrology Research GroupFaculty of MedicineLaval UniversityQuebec CityQCCanada
| | | | - Xingyu Qiu
- Physical and Theoretical Chemistry LaboratoryUniversity of OxfordOxfordUK
| | - Tina Bohstedt
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | | | | | - Alexandre P Garneau
- Department of MedicineNephrology Research GroupFaculty of MedicineLaval UniversityQuebec CityQCCanada
- Cardiometabolic Axis, School of Kinesiology and Physical Activity SciencesUniversity of MontréalMontréalQCCanada
| | - Dong Wang
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | - Gavin McKinley
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | - Christophe P Moreau
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Present address:
Celonic AGBaselGermany
| | | | - Patrizia Abrusci
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
- Present address:
Exscientia LtdOxfordUK
| | - Shubhashish M M Mukhopadhyay
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | - Alejandra Fernandez‐Cid
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | - Samira Slimani
- Department of MedicineNephrology Research GroupFaculty of MedicineLaval UniversityQuebec CityQCCanada
| | - Julie L Lavoie
- Cardiometabolic Axis, School of Kinesiology and Physical Activity SciencesUniversity of MontréalMontréalQCCanada
| | - Nicola A Burgess‐Brown
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
| | | | - Frank DiMaio
- Department of BiochemistryUniversity of WashingtonSeattleWAUSA
| | | | - Paul Isenring
- Department of MedicineNephrology Research GroupFaculty of MedicineLaval UniversityQuebec CityQCCanada
| | - Carol V Robinson
- Physical and Theoretical Chemistry LaboratoryUniversity of OxfordOxfordUK
| | - Katharina L Dürr
- Nuffield Department of MedicineCentre of Medicines DiscoveryUniversity of OxfordOxfordUK
- Structural Genomics ConsortiumNuffield Department of MedicineUniversity of OxfordOxfordUK
- OMass Therapeutics, Ltd.OxfordUK
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10
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Garneau AP, Haydock L, Tremblay LE, Isenring P. Somatic non-cancerous PIK3CA-related overgrowth syndrome treated with alpelisib in North America. J Mol Med (Berl) 2021; 99:311-313. [PMID: 33392635 PMCID: PMC7900069 DOI: 10.1007/s00109-020-02030-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 12/06/2020] [Accepted: 12/17/2020] [Indexed: 12/17/2022]
Affiliation(s)
- Alexandre P Garneau
- Nephrology Research Group, L'Hôtel-Dieu de Québec du CHU de Québec, Department of Medicine, Faculty of Medicine, Laval University, 10 McMahon Street (Room 3852), Québec, QC, G1R 2J6, Canada
| | - Ludwig Haydock
- Nephrology Research Group, L'Hôtel-Dieu de Québec du CHU de Québec, Department of Medicine, Faculty of Medicine, Laval University, 10 McMahon Street (Room 3852), Québec, QC, G1R 2J6, Canada
| | - Laurence E Tremblay
- Nephrology Research Group, L'Hôtel-Dieu de Québec du CHU de Québec, Department of Medicine, Faculty of Medicine, Laval University, 10 McMahon Street (Room 3852), Québec, QC, G1R 2J6, Canada
| | - Paul Isenring
- Nephrology Research Group, L'Hôtel-Dieu de Québec du CHU de Québec, Department of Medicine, Faculty of Medicine, Laval University, 10 McMahon Street (Room 3852), Québec, QC, G1R 2J6, Canada.
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11
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Rieux M, Alpaugh M, Sciacca G, Saint-Pierre M, Masnata M, Denis HL, Lévesque SA, Herrmann F, Bazenet C, Garneau AP, Isenring P, Truant R, Oueslati A, Gould PV, Ast A, Wanker EE, Lacroix S, Cicchetti F. Correction: Shedding a new light on Huntington's disease: how blood can both propagate and ameliorate disease pathology. Mol Psychiatry 2021; 26:5464. [PMID: 32709993 PMCID: PMC8589658 DOI: 10.1038/s41380-020-0850-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Affiliation(s)
- Marie Rieux
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Médecine Moléculaire, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Melanie Alpaugh
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Psychiatrie & Neurosciences, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Giacomo Sciacca
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Psychiatrie & Neurosciences, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Martine Saint-Pierre
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada
| | - Maria Masnata
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Psychiatrie & Neurosciences, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Hélèna L. Denis
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Psychiatrie & Neurosciences, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Sébastien A. Lévesque
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Médecine Moléculaire, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Frank Herrmann
- grid.428240.80000 0004 0553 4650Evotec SE, Essener Bogen 7, 22419 Hamburg, Germany
| | - Chantal Bazenet
- grid.428240.80000 0004 0553 4650Evotec SE, Essener Bogen 7, 22419 Hamburg, Germany
| | - Alexandre P. Garneau
- L’Hôtel-Dieu de Québec—Université Laval, Axe Endocrinologie et Néphrologie, 10 rue McMahon, Québec, QC G1R 2J6 Canada ,grid.14848.310000 0001 2292 3357Ecole de Kinésiologie et des Sciences de l’Activité Physique, Université de Montréal, 2100 boulevard Édouard-Montpetit, Montréal, QC H3T 1J4 Canada
| | - Paul Isenring
- L’Hôtel-Dieu de Québec—Université Laval, Axe Endocrinologie et Néphrologie, 10 rue McMahon, Québec, QC G1R 2J6 Canada
| | - Ray Truant
- grid.25073.330000 0004 1936 8227Department of Biochemistry and Biomedical Research, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L8 Canada
| | - Abid Oueslati
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Médecine Moléculaire, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Peter V. Gould
- Département d’Anatomopathologie et de Cytologie, Centre Hospitalier Affilié Universitaire de Québec, Hôpital de l’Enfant-Jésus, 1401 18ème rue, Québec, QC G1J 1Z4 Canada
| | - Anne Ast
- grid.419491.00000 0001 1014 0849Neuroproteomics, Max Delbrueck Center for Molecular Medicine, 13125 Berlin, Germany ,grid.484013.aBerlin Institute of Health, 10178 Berlin, Germany
| | - Erich E. Wanker
- grid.419491.00000 0001 1014 0849Neuroproteomics, Max Delbrueck Center for Molecular Medicine, 13125 Berlin, Germany ,grid.484013.aBerlin Institute of Health, 10178 Berlin, Germany
| | - Steve Lacroix
- grid.23856.3a0000 0004 1936 8390Centre de Recherche du CHU de Québec—Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC G1V 4G2 Canada ,grid.23856.3a0000 0004 1936 8390Département de Médecine Moléculaire, Université Laval, 1050 avenue de la Médecine, Québec, QC G1V 0A6 Canada
| | - Francesca Cicchetti
- Centre de Recherche du CHU de Québec-Université Laval, Axe Neurosciences, 2705 boulevard Laurier, Québec, QC, G1V 4G2, Canada. .,Département de Psychiatrie & Neurosciences, Université Laval, 1050 avenue de la Médecine, Québec, QC, G1V 0A6, Canada.
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12
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Marcoux AA, Tremblay LE, Slimani S, Fiola MJ, Mac-Way F, Garneau AP, Isenring P. Molecular characteristics and physiological roles of Na + -K + -Cl - cotransporter 2. J Cell Physiol 2020; 236:1712-1729. [PMID: 32776569 PMCID: PMC7818487 DOI: 10.1002/jcp.29997] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Revised: 06/28/2020] [Accepted: 07/24/2020] [Indexed: 12/23/2022]
Abstract
Na+–K+–Cl− cotransporter 2 (NKCC2; SLC12A1) is an integral membrane protein that comes as three splice variants and mediates the cotranslocation of Na+, K+, and Cl− ions through the apical membrane of the thick ascending loop of Henle (TALH). In doing so, and through the involvement of other ion transport systems, it allows this nephron segment to reclaim a large fraction of the ultrafiltered Na+, Cl−, Ca2+, Mg2+, and HCO3− loads. The functional relevance of NKCC2 in human is illustrated by the many abnormalities that result from the inactivation of this transport system through the use of loop diuretics or in the setting of inherited disorders. The following presentation aims at discussing the physiological roles and molecular characteristics of Na+–K+–Cl− cotransport in the TALH and those of the individual NKCC2 splice variants more specifically. Many of the historical and recent data that have emerged from the experiments conducted will be outlined and their larger meaning will also be placed into perspective with the aid of various hypotheses.
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Affiliation(s)
- Andree-Anne Marcoux
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada
| | - Laurence E Tremblay
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada
| | - Samira Slimani
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada
| | - Marie-Jeanne Fiola
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada
| | - Fabrice Mac-Way
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada
| | - Alexandre P Garneau
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada.,Cardiometabolic Axis, School of Kinesiology and Physical Activity Sciences, University of Montréal, Montréal, Quebec, Canada
| | - Paul Isenring
- Department of Medicine, Nephrology Research Group, Laval University, Quebec City, Québec, Canada
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13
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Garneau AP, Slimani S, Tremblay LE, Fiola MJ, Marcoux AA, Isenring P. K +-Cl - cotransporter 1 (KCC1): a housekeeping membrane protein that plays key supplemental roles in hematopoietic and cancer cells. J Hematol Oncol 2019; 12:74. [PMID: 31296230 PMCID: PMC6624878 DOI: 10.1186/s13045-019-0766-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 06/30/2019] [Indexed: 01/04/2023] Open
Abstract
During the 1970s, a Na+-independent, ouabain-insensitive, N-ethylmaleimide-stimulated K+-Cl- cotransport mechanism was identified in red blood cells for the first time and in a variety of cell types afterward. During and just after the mid-1990s, three closely related isoforms were shown to account for this mechanism. They were termed K+-Cl- cotransporter 1 (KCC1), KCC3, and KCC4 according to the nomenclature of Gillen et al. (1996) who had been the first research group to uncover the molecular identity of a KCC, that is, of KCC1 in rabbit kidney. Since then, KCC1 has been found to be the most widely distributed KCC isoform and considered to act as a housekeeping membrane protein. It has perhaps received less attention than the other isoforms for this reason, but as will be discussed in the following review, there is probably more to KCC1 than meets the eye. In particular, the so-called housekeeping gene also appears to play crucial and specific roles in normal as well as pathological hematopoietic and in cancer cells.
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Affiliation(s)
- A P Garneau
- From the Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), G1R 2J6, Canada
- Cardiometabolic Axis, School of Kinesiology and Physical Activity Sciences, University of Montréal, 900, rue Saint-Denis, Montréal (Qc), H2X 0A9, Canada
| | - S Slimani
- From the Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), G1R 2J6, Canada
| | - L E Tremblay
- From the Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), G1R 2J6, Canada
| | - M J Fiola
- From the Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), G1R 2J6, Canada
| | - A A Marcoux
- From the Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), G1R 2J6, Canada
| | - P Isenring
- From the Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), G1R 2J6, Canada.
- L'Hôtel-Dieu de Québec Institution, 10, rue McMahon, Québec (Qc), G1R 2J6, Canada.
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14
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Marcoux AA, Slimani S, Tremblay LE, Frenette-Cotton R, Garneau AP, Isenring P. Endocytic recycling of Na + -K + -Cl - cotransporter type 2: importance of exon 4. J Physiol 2019; 597:4263-4276. [PMID: 31216057 DOI: 10.1113/jp278024] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 06/05/2019] [Indexed: 01/29/2023] Open
Abstract
KEY POINTS Na+ -K+ -Cl- cotransporter type 2 (NKCC2) is a 27-exon membrane protein that is expressed in the thick ascending limb (TAL) of Henle where it is involved in reabsorption of the ultrafiltered NaCl load. It comes as three splice variants that are identical to each other except for the residue composition of exon 4 and that differ in their transport characteristics, functional roles and distributions along the TAL. In this report, it is shown that the variants also differ in their trafficking properties and that two residues in exon 4 play a key role in this regard. One of these residues was also shown to sustain carrier internalization. Through these results, a novel function for the alternatively spliced exon of NKCC2 has been identified and a domain that is involved in carrier trafficking has been uncovered for the first time in a cation-Cl- cotransporter family member. ABSTRACT Na+ -K+ -Cl- cotransporter type 2 (NKCC2) is a 12-transmembrane (TM) domain cell surface glycoprotein that is expressed in the thick ascending limb (TAL) of Henle and stimulated during cell shrinkage. It comes as three splice variants (A, B and F) that are identical to each other except for TM2 and the following connecting segment (CS2). Yet, these variants do not share the same localization, transport characteristics and physiological roles along the TAL. We have recently found that while cell shrinkage could exert its activating effect by increasing NKCC2 expression at the cell surface, the variants also responded differentially to this stimulus. In the current work, a mutagenic approach was exploited to determine whether CS2 could play a role in carrier trafficking and identify the residues potentially involved. We found that when the residue of position 238 in NKCC2A (F) and NKCC2B (Y) was replaced by the corresponding residue in NKCC2F (V), carrier activity increased by over 3-fold and endocytosis decreased concomitantly. We also found that when the residue of position 230 in NKCC2F (M) was replaced by the one in NKCC2B (T), carrier activity and affinity for ions both increased substantially whereas expression at the membrane decreased. Taken together, these results suggest that CS2 is involved in carrier trafficking and that two of its residues, those of positions 238 and 230, are part of an internalization motif. They also indicate that the divergent residue of position 230 plays the dual role of specifying ion affinity and sustaining carrier internalization.
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Affiliation(s)
- Andrée-Anne Marcoux
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Québec, QC, Canada, G1R 2J6
| | - Samira Slimani
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Québec, QC, Canada, G1R 2J6
| | - Laurence E Tremblay
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Québec, QC, Canada, G1R 2J6
| | - Rachelle Frenette-Cotton
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Québec, QC, Canada, G1R 2J6
| | - Alexandre P Garneau
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Québec, QC, Canada, G1R 2J6.,Cardiometabolic Research Group, Department of Kinesiology, Faculty of Medicine, University of Montréal, Montréal, QC, Canada, H3T 1J4
| | - Paul Isenring
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University, Québec, QC, Canada, G1R 2J6
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15
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Marcoux AA, Garneau AP, Isenring P. A "double hit" model of cystic kidney disease. Kidney Int 2019; 95:1275. [PMID: 31010483 DOI: 10.1016/j.kint.2018.09.009] [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] [Received: 08/17/2018] [Revised: 09/05/2018] [Accepted: 09/26/2018] [Indexed: 10/27/2022]
Affiliation(s)
- Andrée-Anne Marcoux
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Canada
| | - Alexandre P Garneau
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Canada
| | - Paul Isenring
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Canada.
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16
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Marcoux AA, Slimani S, Tremblay LE, Frenette-Cotton R, Garneau AP, Isenring P. Regulation of Na +-K +-Cl - cotransporter type 2 by the with no lysine kinase-dependent signaling pathway. Am J Physiol Cell Physiol 2019; 317:C20-C30. [PMID: 30917032 DOI: 10.1152/ajpcell.00041.2019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Na+-K+-Cl- cotransporter type 2 (NKCC2) is confined to the apical membrane of the thick ascending limb of Henle, where it reabsorbs a substantial fraction of the ultrafiltered NaCl load. It is expressed along this nephron segment as three main splice variants (called NKCC2A, NKCC2B, and NKCC2F) that differ in residue composition along their second transmembrane domain and first intracellular cytosolic connecting segment (CS2). NKCC2 is known to be activated by cell shrinkage and intracellular [Cl-] reduction. Although the with no lysine (WNK) kinases could play a role in this response, the mechanisms involved are ill defined, and the possibility of variant-specific responses has not been tested thus far. In this study, we have used the Xenopus laevis oocyte expression system to gain further insight in these regards. We have found for the first time that cell shrinkage could stimulate NKCC2A- and NKCC2B-mediated ion transport by increasing carrier abundance at the cell surface and that this response was achieved (at least in part) by the enzymatic function of a WNK kinase. Interestingly, we have also found that the activity and cell surface abundance of NKCC2F were less affected by cell shrinkage compared with the other variants and that ion transport by certain variants could be stimulated through WNK kinase expression in the absence of carrier redistribution. Taken together, these results suggest that the WNK kinase-dependent pathway can affect both the trafficking as well as intrinsic activity of NKCC2 and that CS2 plays an important role in carrier regulation.
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Affiliation(s)
- Andrée-Anne Marcoux
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University , Quebec City, Quebec , Canada
| | - Samira Slimani
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University , Quebec City, Quebec , Canada
| | - Laurence E Tremblay
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University , Quebec City, Quebec , Canada
| | - Rachelle Frenette-Cotton
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University , Quebec City, Quebec , Canada
| | - Alexandre P Garneau
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University , Quebec City, Quebec , Canada.,Cardiometabolic Research Group, Department of Kinesiology, Faculty of Medicine, University of Montreal , Montreal, Quebec , Canada
| | - Paul Isenring
- Nephrology Research Group, L'Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Laval University , Quebec City, Quebec , Canada
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Garneau AP, Marcoux AA, Slimani S, Tremblay LE, Frenette-Cotton R, Mac-Way F, Isenring P. Physiological roles and molecular mechanisms of K + -Cl - cotransport in the mammalian kidney and cardiovascular system: where are we? J Physiol 2019; 597:1451-1465. [PMID: 30659612 DOI: 10.1113/jp276807] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 08/21/2018] [Accepted: 12/07/2018] [Indexed: 11/08/2022] Open
Abstract
In the early 80s, renal microperfusion studies led to the identification of a basolateral K+ -Cl- cotransport mechanism in the proximal tubule, thick ascending limb of Henle and collecting duct. More than ten years later, this mechanism was found to be accounted for by three different K+ -Cl- cotransporters (KCC1, KCC3 and KCC4) that are differentially distributed along the renal epithelium. Two of these isoforms (KCC1 and KCC3) were also found to be expressed in arterial walls, the myocardium and a variety of neurons. Subsequently, valuable insights have been gained into the molecular and physiological properties of the KCCs in both the mammalian kidney and cardiovascular system. There is now robust evidence indicating that KCC4 sustains distal renal acidification and that KCC3 regulates myogenic tone in resistance vessels. However, progress in understanding the functional significance of these transporters has been slow, probably because each of the KCC isoforms is not identically distributed among species and some of them share common subcellular localizations with other KCC isoforms or sizeable conductive Cl- pathways. In addition, the mechanisms underlying the process of K+ -Cl- cotransport are still ill defined. The present review focuses on the knowledge gained regarding the roles and properties of KCCs in renal and cardiovascular tissues.
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Affiliation(s)
- A P Garneau
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6.,Cardiometabolic Axis, School of Kinesiology and Physical Activity Sciences, Montreal University, 900, rue Saint-Denis, Montréal, (Qc) H2X 0A9
| | - A A Marcoux
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6
| | - S Slimani
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6
| | - L E Tremblay
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6
| | - R Frenette-Cotton
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6
| | - F Mac-Way
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6
| | - P Isenring
- Nephrology Research Group, Department of Medicine, Laval University, 11, côte du Palais, Québec (Qc), Canada, G1R 2J6
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Garneau AP, de Cotret PR, Tesolin M, Isenring P. Progressive renal failure complicated by transient and recurrent ureteral obstruction. CMAJ 2018; 190:E1168-E1170. [PMID: 30274994 DOI: 10.1503/cmaj.180514] [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: 11/01/2022] Open
Affiliation(s)
- Alexandre P Garneau
- Nephrology Center (Garneau, Isenring, de Cotret); Departments of Radiology of the L'Hôtel-Dieu de Québec Hospital and Medicine (Tesolin), Faculty of Medicine, Laval University, Québec, Que.; Cardiometabolic Research Group (Garneau), Department of Kinesiology, University of Montreal, Montréal, Que
| | - Paul René de Cotret
- Nephrology Center (Garneau, Isenring, de Cotret); Departments of Radiology of the L'Hôtel-Dieu de Québec Hospital and Medicine (Tesolin), Faculty of Medicine, Laval University, Québec, Que.; Cardiometabolic Research Group (Garneau), Department of Kinesiology, University of Montreal, Montréal, Que
| | - Maude Tesolin
- Nephrology Center (Garneau, Isenring, de Cotret); Departments of Radiology of the L'Hôtel-Dieu de Québec Hospital and Medicine (Tesolin), Faculty of Medicine, Laval University, Québec, Que.; Cardiometabolic Research Group (Garneau), Department of Kinesiology, University of Montreal, Montréal, Que
| | - Paul Isenring
- Nephrology Center (Garneau, Isenring, de Cotret); Departments of Radiology of the L'Hôtel-Dieu de Québec Hospital and Medicine (Tesolin), Faculty of Medicine, Laval University, Québec, Que.; Cardiometabolic Research Group (Garneau), Department of Kinesiology, University of Montreal, Montréal, Que.
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Garneau AP, Marcoux A, Frenette‐Cotton R, Bélanger R, Isenring P. A new gold standard approach to characterize the transport of Si across cell membranes in animals. J Cell Physiol 2018; 233:6369-6376. [DOI: 10.1002/jcp.26476] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 01/05/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Alexandre P. Garneau
- The Nephrology Research Group, Department of Medicine Laval University Québec Canada
- Cardiometabolic Research Group, Department of Kinesiology University of Montréal Montreal Canada
| | - Andrée‐Anne Marcoux
- The Nephrology Research Group, Department of Medicine Laval University Québec Canada
| | | | - Richard Bélanger
- Horticulture Research Group, Phytology Department Laval University, Pavillon Paul‐Comtois Québec Canada
| | - Paul Isenring
- The Nephrology Research Group, Department of Medicine Laval University Québec Canada
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Frenette-Cotton R, Marcoux AA, Garneau AP, Noel M, Isenring P. Phosphoregulation of K + -Cl - cotransporters during cell swelling: Novel insights. J Cell Physiol 2018; 233:396-408. [PMID: 28276587 DOI: 10.1002/jcp.25899] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 03/06/2017] [Indexed: 01/21/2023]
Abstract
The K+ -Cl- cotransporters (KCCs) belong to the cation-Cl- cotransporter family and consist of four isoforms and many splice variants. Their main role is to promote electroneutral efflux of K+ and Cl- ions across the surface of many cell types and, thereby, to regulate intracellular ion concentration, cell volume, and epithelial salt movement. These transport systems are induced by an increase in cell volume and are less active at lower intracellular [Cl- ] (Cli ), but the mechanisms at play are still ill-defined. In this work, we have exploited the Xenopus laevis expression system to study the role of lysine-deficient protein kinases (WNKs), protein phosphatases 1 (PP1s), and SPS1-related proline/alanine-rich kinase (SPAK) in KCC4 regulation during cell swelling. We have found that WNK4 and PP1 regulate KCC4 activity as part of a common signaling module, but that they do not exert their effects through SPAK or carrier dephosphorylation. We have also found that the phosphatases at play include PP1α and PP1γ1, but that WNK4 acts directly on the PP1s instead of the opposite. Unexpectedly, however, both cell swelling and a T926A substitution in the C-terminus of full-length KCC4 led to higher levels of heterologous K+ -Cl- cotransport and overall carrier phosphorylation. These results imply that the response to cell swelling must also involve allosteric-sensitive kinase-dependent phosphoacceptor sites in KCC4. They are thus partially inconsistent with previous models of KCC regulation.
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Affiliation(s)
| | - Andrée-Anne Marcoux
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Québec, Canada
| | - Alexandre P Garneau
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Québec, Canada
| | - Micheline Noel
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Québec, Canada
| | - Paul Isenring
- Nephrology Research Group, Department of Medicine, Laval University, Québec, Québec, Canada
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Frenette‐Cotton R, Marcoux A, Garneau AP, Noel M, Isenring P. Cover Image, Volume 233, Number 1, January 2018. J Cell Physiol 2018. [DOI: 10.1002/jcp.26180] [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: 11/06/2022]
Affiliation(s)
| | - Andrée‐Anne Marcoux
- Nephrology Research Group, Department of MedicineLaval UniversityQuébecQuébecCanada
| | - Alexandre P. Garneau
- Nephrology Research Group, Department of MedicineLaval UniversityQuébecQuébecCanada
| | - Micheline Noel
- Nephrology Research Group, Department of MedicineLaval UniversityQuébecQuébecCanada
| | - Paul Isenring
- Nephrology Research Group, Department of MedicineLaval UniversityQuébecQuébecCanada
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Garneau AP, Marcoux AA, Frenette-Cotton R, Mac-Way F, Lavoie JL, Isenring P. Molecular insights into the normal operation, regulation, and multisystemic roles of K +-Cl - cotransporter 3 (KCC3). Am J Physiol Cell Physiol 2017; 313:C516-C532. [PMID: 28814402 DOI: 10.1152/ajpcell.00106.2017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Revised: 07/26/2017] [Accepted: 08/14/2017] [Indexed: 12/12/2022]
Abstract
Long before the molecular identity of the Na+-dependent K+-Cl- cotransporters was uncovered in the mid-nineties, a Na+-independent K+-Cl- cotransport system was also known to exist. It was initially observed in sheep and goat red blood cells where it was shown to be ouabain-insensitive and to increase in the presence of N-ethylmaleimide (NEM). After it was established between the early and mid-nineties, the expressed sequence tag (EST) databank was found to include a sequence that was highly homologous to those of the Na+-dependent K+-Cl- cotransporters. This sequence was eventually found to code for the Na+-independent K+-Cl- cotransport function that was described in red blood cells several years before. It was termed KCC1 and led to the discovery of three isoforms called KCC2, KCC3, and KCC4. Since then, it has become obvious that each one of these isoforms exhibits unique patterns of distribution and fulfills distinct physiological roles. Among them, KCC3 has been the subject of great attention in view of its important role in the nervous system and its association with a rare hereditary sensorimotor neuropathy (called Andermann syndrome) that affects many individuals in Quebec province (Canada). It was also found to play important roles in the cardiovascular system, the organ of Corti, and circulating blood cells. As will be seen in this review, however, there are still a number of uncertainties regarding the transport properties, structural organization, and regulation of KCC3. The same is true regarding the mechanisms by which KCC3 accomplishes its numerous functions in animal cells.
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Affiliation(s)
- A P Garneau
- Nephrology Research Group, Department of Medicine, Laval University, Quebec City, Quebec, Canada; and
- Cardiometabolic Axis, Kinesiology Department, University of Montréal, Montreal, Quebec, Canada
| | - A A Marcoux
- Nephrology Research Group, Department of Medicine, Laval University, Quebec City, Quebec, Canada; and
| | - R Frenette-Cotton
- Nephrology Research Group, Department of Medicine, Laval University, Quebec City, Quebec, Canada; and
| | - F Mac-Way
- Nephrology Research Group, Department of Medicine, Laval University, Quebec City, Quebec, Canada; and
| | - J L Lavoie
- Cardiometabolic Axis, Kinesiology Department, University of Montréal, Montreal, Quebec, Canada
| | - P Isenring
- Nephrology Research Group, Department of Medicine, Laval University, Quebec City, Quebec, Canada; and
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Affiliation(s)
- I-A Iliuta
- Department of Nephrology, Québec, QC, Canada
| | - A P Garneau
- Department of Nephrology, Québec, QC, Canada
| | - E Latulippe
- Department of Medicine, Pathology Group, L'Hôtel-Dieu du CHU de Québec, Laval University, Québec, QC, Canada
| | - P Isenring
- Department of Nephrology, Québec, QC, Canada
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Carpentier GA, Garneau AP, Marcoux AA, Noël M, Frenette-Cotton R, Isenring P. Identification of key residues involved in Si transport by the aquaglyceroporins. J Gen Physiol 2016; 148:239-51. [PMID: 27527099 PMCID: PMC5004335 DOI: 10.1085/jgp.201611598] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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] [Received: 03/29/2016] [Accepted: 07/18/2016] [Indexed: 01/20/2023] Open
Abstract
We recently demonstrated that the aquaglyceroporins (AQGPs) could act as potent transporters for orthosilicic acid (H4SiO4). Although interesting, this finding raised the question of whether water and H4SiO4, the transportable form of Si, permeate AQGPs by interacting with the same region of the pore, especially in view of the difference in molecular radius between the two substrates. Here, our goal was to identify residues that endow the AQGPs with the ability to facilitate Si diffusion by examining the transport characteristics of mutants in which residues were interchanged between a water-permeable but Si-impermeable channel (aquaporin 1 [AQP1]) and a Si-permeable but water-impermeable channel (AQP10). Our results indicate that the composition of the arginine filter (XX/R), known to include three residues that play an important role in water transport, may also be involved in Si selectivity. Interchanging the identities of the nonarginine residues within this filter causes Si transport to increase by approximately sevenfold in AQP1 and to decrease by approximately threefold in AQP10, whereas water transport and channel expression remain unaffected. Our results further indicate that two additional residues in the AQP arginine filter may be involved in substrate selectivity: replacing one of the residues has a profound effect on water permeability, and replacing the other has a profound effect on Si permeability. This study has thus led to the identification of residues that could play a key role in Si transport by the AQGPs and shown that substrate selectivity is likely ensured by more than one checkpoint within or near the pore.
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Affiliation(s)
- Gabriel A Carpentier
- Nephrology Research Group, Department of Medicine, Laval University, L'Hôtel-Dieu de Québec Hospital, Québec, Québec G1R 2J6, Canada
| | - Alexandre P Garneau
- Nephrology Research Group, Department of Medicine, Laval University, L'Hôtel-Dieu de Québec Hospital, Québec, Québec G1R 2J6, Canada
| | - Andrée-Anne Marcoux
- Nephrology Research Group, Department of Medicine, Laval University, L'Hôtel-Dieu de Québec Hospital, Québec, Québec G1R 2J6, Canada
| | - Micheline Noël
- Nephrology Research Group, Department of Medicine, Laval University, L'Hôtel-Dieu de Québec Hospital, Québec, Québec G1R 2J6, Canada
| | - Rachelle Frenette-Cotton
- Nephrology Research Group, Department of Medicine, Laval University, L'Hôtel-Dieu de Québec Hospital, Québec, Québec G1R 2J6, Canada
| | - Paul Isenring
- Nephrology Research Group, Department of Medicine, Laval University, L'Hôtel-Dieu de Québec Hospital, Québec, Québec G1R 2J6, Canada
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Garneau AP, Marcoux AA, Noël M, Frenette-Cotton R, Drolet MC, Couet J, Larivière R, Isenring P. Ablation of Potassium-Chloride Cotransporter Type 3 (Kcc3) in Mouse Causes Multiple Cardiovascular Defects and Isosmotic Polyuria. PLoS One 2016; 11:e0154398. [PMID: 27166674 PMCID: PMC4864296 DOI: 10.1371/journal.pone.0154398] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 04/12/2016] [Indexed: 12/20/2022] Open
Abstract
Inactivation of Kcc3 in a mixed 129/Sv×C57BL/6 mouse background has been previously found to increase systemic blood pressure (BP) through presumed neurogenic mechanisms. Yet, while this background is generally not considered ideal to investigate the cardiovascular system, KCC3 is also expressed in the arterial wall and proximal nephron. In the current study, the effects of Kcc3 ablation was investigated in a pure rather than mixed C57BL/6J background under regular- and high-salt diets to determine whether they could be mediated through vasculogenic and nephrogenic mechanisms. Aortas were also assessed for reactivity to pharmacological agents while isolated from the influence of sympathetic ganglia. This approach led to the identification of unforeseen abnormalities such as lower pulse pressure, heart rate, aortic reactivity and aortic wall thickness, but higher diastolic BP, left ventricular mass and urinary output in the absence of increased catecholamine levels. Salt loading also led systolic BP to be higher, but to no further changes in hemodynamic parameters. Importantly, aortic vascular smooth muscle cells and cardiomyocytes were both found to express KCC3 abundantly in heterozygous mice. Hence, Kcc3 inactivation in our model caused systemic vascular resistance and ventricular mass to increase while preventing extracellular fluid volume to accumulate. Given that it also affected the physiological properties of aortas in vitro, vasculogenic mechanisms could therefore account for a number of the hemodynamic abnormalities observed.
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Affiliation(s)
- Alexandre P. Garneau
- Nephrology Research Group, Centre de recherche L’Hôtel-Dieu de Québec, Centre hospitalier universitaire de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Andrée-Anne Marcoux
- Nephrology Research Group, Centre de recherche L’Hôtel-Dieu de Québec, Centre hospitalier universitaire de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Micheline Noël
- Nephrology Research Group, Centre de recherche L’Hôtel-Dieu de Québec, Centre hospitalier universitaire de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Rachelle Frenette-Cotton
- Nephrology Research Group, Centre de recherche L’Hôtel-Dieu de Québec, Centre hospitalier universitaire de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Marie-Claude Drolet
- Valvulopathy Research Group, Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Jacques Couet
- Valvulopathy Research Group, Centre de recherche de l’Institut universitaire de cardiologie et de pneumologie de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Richard Larivière
- Nephrology Research Group, Centre de recherche L’Hôtel-Dieu de Québec, Centre hospitalier universitaire de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
| | - Paul Isenring
- Nephrology Research Group, Centre de recherche L’Hôtel-Dieu de Québec, Centre hospitalier universitaire de Québec, Québec City, Canada
- Department of Medicine, Université Laval, Québec City, Canada
- * E-mail:
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Garneau AP, Carpentier GA, Marcoux AA, Frenette-Cotton R, Simard CF, Rémus-Borel W, Caron L, Jacob-Wagner M, Noël M, Powell JJ, Bélanger R, Côté F, Isenring P. Aquaporins Mediate Silicon Transport in Humans. PLoS One 2015; 10:e0136149. [PMID: 26313002 PMCID: PMC4551902 DOI: 10.1371/journal.pone.0136149] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2015] [Accepted: 07/31/2015] [Indexed: 01/15/2023] Open
Abstract
In animals, silicon is an abundant and differentially distributed trace element that is believed to play important biological functions. One would thus expect silicon concentrations in body fluids to be regulated by silicon transporters at the surface of many cell types. Curiously, however, and even though they exist in plants and algae, no such transporters have been identified to date in vertebrates. Here, we show for the first time that the human aquaglyceroporins, i.e., AQP3, AQP7, AQP9 and AQP10 can act as silicon transporters in both Xenopus laevis oocytes and HEK-293 cells. In particular, heterologously expressed AQP7, AQP9 and AQP10 are all able to induce robust, saturable, phloretin-sensitive silicon transport activity in the range that was observed for low silicon rice 1 (lsi1), a silicon transporter in plant. Furthermore, we show that the aquaglyceroporins appear as relevant silicon permeation pathways in both mice and humans based on 1) the kinetics of substrate transport, 2) their presence in tissues where silicon is presumed to play key roles and 3) their transcriptional responses to changes in dietary silicon. Taken together, our data provide new evidence that silicon is a potentially important biological element in animals and that its body distribution is regulated. They should open up original areas of investigations aimed at deciphering the true physiological role of silicon in vertebrates.
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Affiliation(s)
- Alexandre P. Garneau
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Gabriel A. Carpentier
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Andrée-Anne Marcoux
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Rachelle Frenette-Cotton
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Charles F. Simard
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Wilfried Rémus-Borel
- Department of Phytology, Faculty of Sciences of Agriculture and Alimentation, Laval Université Laval, Québec City, Québec, Canada
| | - Luc Caron
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Mariève Jacob-Wagner
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Micheline Noël
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Jonathan J. Powell
- Medical Research Council Human Nutrition Research, Elsie Widdowson Laboratory, Cambridge, United Kingdom
| | - Richard Bélanger
- Department of Phytology, Faculty of Sciences of Agriculture and Alimentation, Laval Université Laval, Québec City, Québec, Canada
| | - François Côté
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
| | - Paul Isenring
- L’Hôtel-Dieu de Québec Research Center, Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Québec, Canada
- * E-mail:
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