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Patti G, Napoli F, Fava D, Casalini E, Di Iorgi N, Maghnie M. Approach to the Pediatric Patient: Central Diabetes Insipidus. J Clin Endocrinol Metab 2022; 107:1407-1416. [PMID: 34993537 DOI: 10.1210/clinem/dgab930] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Indexed: 11/19/2022]
Abstract
Central diabetes insipidus (CDI) is a complex disorder in which large volumes of dilute urine are excreted due to arginine-vasopressin deficiency, and it is caused by a variety of disorders affecting the hypothalamic-posterior pituitary network. The differential diagnosis is challenging and requires a detailed medical history, physical examination, biochemical approach, imaging studies, and, in some cases, histological confirmation. Magnetic resonance imaging is the gold standard method for evaluating congenital or acquired cerebral and pituitary stalk lesions. Pituitary stalk size at presentation could be normal, but it may change over time, depending on the underlying condition, while other brain areas or organs may become involved during follow-up. Early diagnosis and treatment are crucial to avoid central nervous system damage and germ cell tumor dissemination and to minimize complications of multiple pituitary hormone defects. We provide a practical update on the diagnosis and management of patients with CDI and highlight several pitfalls that may complicate the differential diagnosis of conditions presenting with polyuria and polydipsia. The need for a careful and close follow-up of patients with apparently idiopathic CDI is particularly emphasized because the underlying condition may be recognized over time. The clinical scenario that we outline at the beginning of this article represents the basis for the discussion about how the etiological diagnosis of CDI can be overlooked and demonstrates how a water intake and urine output improvement can be a sign of progressive damage of both hypothalamus and anterior pituitary gland with associated pituitary hormonal deficiencies.
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Affiliation(s)
- Giuseppa Patti
- Department of Pediatrics, IRCCS Istituto Giannina Gaslini, University of Genova, Genova, Italy
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Flavia Napoli
- Department of Pediatrics, IRCCS Istituto Giannina Gaslini, University of Genova, Genova, Italy
| | - Daniela Fava
- Department of Pediatrics, IRCCS Istituto Giannina Gaslini, University of Genova, Genova, Italy
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Emilio Casalini
- Department of Pediatrics, IRCCS Istituto Giannina Gaslini, University of Genova, Genova, Italy
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Natascia Di Iorgi
- Department of Pediatrics, IRCCS Istituto Giannina Gaslini, University of Genova, Genova, Italy
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Mohamad Maghnie
- Department of Pediatrics, IRCCS Istituto Giannina Gaslini, University of Genova, Genova, Italy
- Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
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Zhu X, Huang Y, Li S, Ge N, Li T, Wang Y, Liu K, Liu C. Glucocorticoids Reverse Diluted Hyponatremia Through Inhibiting Arginine Vasopressin Pathway in Heart Failure Rats. J Am Heart Assoc 2020; 9:e014950. [PMID: 32390535 PMCID: PMC7660850 DOI: 10.1161/jaha.119.014950] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Background Arginine vasopressin dependent antidiuresis plays a key role in water‐sodium retention in heart failure. In recent years, the role of glucocorticoids in the control of body fluid homeostasis has been extensively investigated. Glucocorticoid deficiency can activate V2R (vasopressin receptor 2), increase aquaporins expression, and result in hyponatremia, all of which can be reversed by glucocorticoid supplement. Methods and Results Heart failure was induced by coronary artery ligation for 8 weeks. A total of 32 rats were randomly assigned to 4 groups (n=8/group): sham surgery group, congestive heart failure group, dexamethasone group, and dexamethasone in combination with glucocorticoid receptor antagonist RU486 group. An acute water loading test was administered 6 hours after drug administration. Left ventricular function was measured by a pressure‐volume catheter. Protein expressions were determined by immunohistochemistry and immunoblotting. The pressure‐volume loop analysis showed that dexamethasone improves cardiac function in rats with heart failure. Western blotting confirmed that dexamethasone remarkably reduces the expressions of V2R, aquaporin 2, and aquaporin 3 in the renal‐collecting ducts. As a result of V2R downregulation, the expressions of glucocorticoid regulated kinase 1, apical epithelial sodium channels, and the furosemide‐sensitive Na‐K‐2Cl cotransporter were also downregulated. These favorable effects induced by dexamethasone were mostly abolished by the glucocorticoid receptor inhibitor RU486, indicating that the aforementioned effects are glucocorticoid receptor mediated. Conclusions Glucocorticoids can reverse diluted hyponatremia via inhibiting the vasopressin receptor pathway in rats with heart failure.
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Affiliation(s)
- Xiaoran Zhu
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China.,Department of Pharmacy Hebei General Hospital Shijiazhuang China
| | - Yaomeng Huang
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China
| | - Shuyu Li
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China.,Department of Cardiovascular Medicine Fengnan District Hospital Tangshan China
| | - Ning Ge
- Regenerative Medicine Institute School of Medicine National University of Ireland Galway Ireland
| | - Tongxin Li
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China
| | - Yu Wang
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China
| | - Kunshen Liu
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China
| | - Chao Liu
- The First Cardiology Division The First Hospital of Hebei Medical University Shijiazhuang China
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Chen Z, Zhuang J, Yang Q, Yang J, Wang D, Yu L, Chen M. Direct effect of protein kinase A on four putative phosphorylation sites of aquaporin 2 in vitro. Biochem Biophys Res Commun 2020; 525:505-511. [PMID: 32113684 DOI: 10.1016/j.bbrc.2020.02.049] [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: 01/07/2020] [Revised: 02/06/2020] [Accepted: 02/07/2020] [Indexed: 10/24/2022]
Abstract
The water channel aquaporin 2 (AQP2) has four phosphorylation sites at Ser256, Ser261, Ser264, and Ser269 in the C-terminus and these sites are important for AQP2 bioactivity. However, the exact role of each phosphorylation site still remains unclear. In this study, we generated unique AQP2 mutants in which we eliminated three phosphorylation sites but maintained only one site at the C-terminal end. The AQP2 phosphorylation of each single site by protein kinase A (PKA) was examined by in vitro translation and 32P incorporation. The ability of AQP2 trafficking to the cell membrane was evaluated by cell surface biotinylation. Among the four phosphorylation sites, AQP2 mutant with only S256 preserved the most ability of AQP2 to cell membrane expression. The AQP2 water permeability was measured in oocyte. Ser256 is the most important site for AQP2 function. Interestingly, Ser261 and Ser264 significantly inhibit AQP2 activity. Ser269 slightly but not statistically reduced AQP2 activity. Our data suggest that the four phosphorylation sites execute differential roles in concert in AQP2 functional regulation. AQP2 activity regulated by phosphorylation at Ser256 can be counterbalanced by phosphorylation at Ser261 and Ser264.
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Affiliation(s)
- Zhiyi Chen
- The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Jieqiu Zhuang
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Qing Yang
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Jianhuan Yang
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Dexuan Wang
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Linfang Yu
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China
| | - Minguang Chen
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China; The Second School of Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China.
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Zhou N, Yang C. A case of extreme hyponatremia without neurologic symptoms. Clin Case Rep 2019; 7:1874-1879. [PMID: 31624600 PMCID: PMC6787862 DOI: 10.1002/ccr3.2383] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 07/02/2019] [Accepted: 07/28/2019] [Indexed: 12/25/2022] Open
Abstract
Our case report highlights that profound hyponatremia with sodium level 101 mmol/L could have no CNS symptoms, and drugs and endocrine disorders are relatively common causes and should be considered in the differential diagnosis of hyponatremia. Standard dose trimethoprim-sulfamethoxazole-induced hyponatremia is rare but still worth close attention in clinical practice.
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Affiliation(s)
- Na Zhou
- Kidney Research ClinicUniversity of Utah School of MedicineSalt Lake CityUtah
| | - Chang Yang
- Apogee Hospital MedicinePassavant Area HospitalJacksonvilleIllinois
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Chen M, Cai H, Klein JD, Laur O, Chen G. Dexamethasone increases aquaporin-2 protein expression in ex vivo inner medullary collecting duct suspensions. Front Physiol 2015; 6:310. [PMID: 26578982 PMCID: PMC4630297 DOI: 10.3389/fphys.2015.00310] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 10/14/2015] [Indexed: 12/25/2022] Open
Abstract
Aquaporin-2 (AQP2) is the vasopressin-regulated water channel that controls renal water reabsorption and plays an important role in the maintenance of body water homeostasis. Excessive glucocorticoid as often seen in Cushing's syndrome causes water retention. However, whether and how glucocorticoid regulates AQP2 remains unclear. In this study, we examined the direct effect of dexamethasone on AQP2 protein expression and activity. Dexamethasone increased AQP2 protein abundance in rat inner medullary collecting duct (IMCD) suspensions. This was confirmed in HEK293 cells transfected with AQP2 cDNA. Cell surface protein biotinylation showed an increase of dexamethasone-induced cell membrane AQP2 expression and this effect was blocked by glucocorticoid receptor antagonist RU486. Functionally, dexamethasone treatment of oocytes injected with an AQP2 cRNA increased water transport activity as judged by cell rupture time in a hypo-osmotic solution (66 ± 13 s in dexamethasone vs. 101 ± 11 s in control, n = 15). We further found that dexamethasone treatment reduced AQP2 protein degradation, which could result in an increase of AQP2 protein. Interestingly, dexamethasone promoted cell membrane AQP2 moving to less buoyant lipid raft submicrodomains. Taken together, our data demonstrate that dexamethasone promotes AQP2 protein expression and increases water permeability mainly via inhibition of AQP2 protein degradation. The increase in AQP2 activity promotes water reabsorption, which may contribute to glucocorticoid-induced water retention and hypertension.
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Affiliation(s)
- Minguang Chen
- Division of Nephrology, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University Wenzhou, China ; Department of Physiology, Emory University School of Medicine Atlanta, GA, USA
| | - Hui Cai
- Department of Physiology, Emory University School of Medicine Atlanta, GA, USA ; Renal Division, Department of Medicine, Emory University School of Medicine Atlanta, GA, USA
| | - Janet D Klein
- Department of Physiology, Emory University School of Medicine Atlanta, GA, USA ; Renal Division, Department of Medicine, Emory University School of Medicine Atlanta, GA, USA
| | - Oskar Laur
- Department of Microbiology and Immunology, Emory University School of Medicine Atlanta, GA, USA
| | - Guangping Chen
- Department of Physiology, Emory University School of Medicine Atlanta, GA, USA ; Renal Division, Department of Medicine, Emory University School of Medicine Atlanta, GA, USA
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