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Boudin E, de Jong TR, Prickett TCR, Lapauw B, Toye K, Van Hoof V, Luyckx I, Verstraeten A, Heymans HSA, Dulfer E, Van Laer L, Berry IR, Dobbie A, Blair E, Loeys B, Espiner EA, Wit JM, Van Hul W, Houpt P, Mortier GR. Bi-allelic Loss-of-Function Mutations in the NPR-C Receptor Result in Enhanced Growth and Connective Tissue Abnormalities. Am J Hum Genet 2018; 103:288-295. [PMID: 30032985 DOI: 10.1016/j.ajhg.2018.06.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 06/12/2018] [Indexed: 12/20/2022] Open
Abstract
The natriuretic peptide signaling pathway has been implicated in many cellular processes, including endochondral ossification and bone growth. More precisely, different mutations in the NPR-B receptor and the CNP ligand have been identified in individuals with either short or tall stature. In this study we show that the NPR-C receptor (encoded by NPR3) is also important for the regulation of linear bone growth. We report four individuals, originating from three different families, with a phenotype characterized by tall stature, long digits, and extra epiphyses in the hands and feet. In addition, aortic dilatation was observed in two of these families. In each affected individual, we identified a bi-allelic loss-of-function mutation in NPR3. The missense mutations (c.442T>C [p.Ser148Pro] and c.1088A>T [p.Asp363Val]) resulted in intracellular retention of the NPR-C receptor and absent localization on the plasma membrane, whereas the nonsense mutation (c.1524delC [p.Tyr508∗]) resulted in nonsense-mediated mRNA decay. Biochemical analysis of plasma from two affected and unrelated individuals revealed a reduced NTproNP/NP ratio for all ligands and also high cGMP levels. These data strongly suggest a reduced clearance of natriuretic peptides by the defective NPR-C receptor and consequently increased activity of the NPR-A/B receptors. In conclusion, this study demonstrates that loss-of-function mutations in NPR3 result in increased NPR-A/B signaling activity and cause a phenotype marked by enhanced bone growth and cardiovascular abnormalities.
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Affiliation(s)
- Eveline Boudin
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Tjeerd R de Jong
- Department of Plastic and Reconstructive Surgery and Hand Surgery, Isala Clinics, 8025 AB Zwolle, the Netherlands
| | - Tim C R Prickett
- Department of Medicine, University of Otago, Christchurch 8011, New Zealand
| | - Bruno Lapauw
- Department of Endocrinology and Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
| | - Kaatje Toye
- Department of Endocrinology and Unit for Osteoporosis and Metabolic Bone Diseases, Ghent University Hospital, 9000 Ghent, Belgium
| | - Viviane Van Hoof
- Department of Clinical Chemistry, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Ilse Luyckx
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Aline Verstraeten
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Hugo S A Heymans
- Department of Pediatrics, Emma's Children's Hospital - Academic Medical Centre, 1105 AZ Amsterdam, the Netherlands
| | - Eelco Dulfer
- Department of Medical Genetics, University Medical Center Groningen, 9713 GZ Groningen, the Netherlands
| | - Lut Van Laer
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Ian R Berry
- Leeds Genetics Laboratory, St James's University Hospital, Leeds LS7 4SA, UK
| | - Angus Dobbie
- Yorkshire Clinical Genetics Service, Chapel Allerton Hospital, Leeds LS7 4SA, UK
| | - Ed Blair
- Oxford Centre for Genomic Medicine, Oxford University Hospitals NHS Foundation Trust, Oxford OX3 7HE, UK
| | - Bart Loeys
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Eric A Espiner
- Department of Medicine, University of Otago, Christchurch 8011, New Zealand
| | - Jan M Wit
- Department of Pediatrics, Leiden University Medical Center, 2333 ZA Leiden, the Netherlands
| | - Wim Van Hul
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Peter Houpt
- Department of Plastic and Reconstructive Surgery and Hand Surgery, Isala Clinics, 8025 AB Zwolle, the Netherlands
| | - Geert R Mortier
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium.
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Felipo V, Urios A, García-Torres ML, El Mlili N, del Olmo JA, Civera M, Ortega J, Ferrandez A, Martínez-Valls J, Cassinello N, Montoliu C. Alterations in adipocytokines and cGMP homeostasis in morbid obesity patients reverse after bariatric surgery. Obesity (Silver Spring) 2013; 21:229-37. [PMID: 23404955 DOI: 10.1002/oby.20008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Accepted: 06/07/2012] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Obesity-associated nonalcoholic fatty liver disease (NAFLD), covering from simple steatosis to nonalcoholic steatohepatitis (NASH), is a common cause of chronic liver disease. Aberrant production of adipocytokines seems to play a main role in most obesity-associated disorders. Changes in adipocytokines in obesity could be mediated by alterations in cyclic GMP (cGMP) homeostasis. The aims of this work were: (1) to study the role of altered cGMP homeostasis in altered adipocytokines in morbid obesity, (2) to assess whether these alterations are different in simple steatosis or NASH, and (3) to assess whether these changes reverse in obese patients after bariatric surgery. DESIGN AND METHODS In 47 patients with morbid obesity and 45 control subjects, the levels in blood of adipocytokines, cGMP, nitric oxide (NO) metabolites, and atrial natriuretic peptide (ANP) were studied. Whether weight loss after a bariatric surgery reverses the changes in these parameters was evaluated. RESULTS NO metabolites and leptin increase (and adiponectin decreases) similarly in patients with steatosis or NASH, suggesting that these changes are due to morbid obesity and not to liver disease. Inflammation and cGMP homeostasis are affected both by morbid obesity and by liver disease. The increases in interleukin 6 (IL-6), interleukin 18 (IL-18), plasma cGMP, ANP, and the decrease in cGMP in lymphocytes are stronger in patients with NASH than with steatosis. All these changes reverse completely after bariatric surgery and weight loss, except IL-18. CONCLUSION Altered cGMP homeostasis seems to contribute more than inflammation to changes in leptin and adiponectin in morbid obesity.
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Affiliation(s)
- Vicente Felipo
- Laboratory of Neurobiology, Centro de Investigación Príncipe Felipe, Valencia, Spain
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Abstract
PURPOSE OF REVIEW This article reviews the genetics, biochemistry, and physiology of the natriuretic polypeptide family and their receptors; their roles in cardiac, bone, and lipid metabolism in children; and pharmacological agents that utilize the natriuretic polypeptide system. RECENT FINDINGS Clinically, measurements of circulating levels of the natriuretic polypeptides are useful diagnostic and prognostic markers of cardiovascular disease in children. The natriuretic polypeptides also play an important role in growth and body composition. Therapeutic application of the natriuretic polypeptide system may provide new treatments for cardiac, renal, bone, and metabolic disease in children. SUMMARY The natriuretic polypeptide system has promising clinical utility in the care of pediatric patients with cardiac, renal, bone, and metabolic disease.
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Dressendörfer RA, Heim JM, Gerzer R, Strasburger CJ. A non-isotopic immunoassay for guanosine 3':5'-cyclic monophosphate using a cyclic GMP-biotin conjugate as tracer. JOURNAL OF IMMUNOASSAY 1995; 16:37-53. [PMID: 7775661 DOI: 10.1080/15321819508013548] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
2'-O-monosuccinylguanosine 3':5'-cyclic monophosphate was coupled to N-biotinyl-1,8-diamino-3,6-dioxaoctane after converting succinyl-cGMP into its N-hydroxysuccinimide active ester. Isolation and purification of the succinyl-cGMP-biotin conjugate was performed with FPLC using reversed phase chromatography. The synthesis described yielded a conjugate suitable for use as tracer in immunoassays for the cGMP measurement in plasma and urine samples. Employing biotin as the primary probe in a competitive solid phase immunoassay allows for flexible end point determination by means of commercially available labeled streptavidin derivatives. Streptavidin-europium was used in conjunction with the DELFIA-system for time-resolved fluorometric end point measurement (TR-FIA), streptavidin-horseradish peroxidase was used for colorimetric end point determination (EIA). Both non radioactive immunoassay systems showed excellent correlation with the reference radioimmunoassay, good sensitivity and reproducibility. The succinyl-cGMP-biotin conjugate was shown to be stable for more than two years without any apparent loss of chemical stability or immunological reactivity.
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Affiliation(s)
- R A Dressendörfer
- Medizinische Klinik, Klinikum Innenstadt, Ludwig-Maximilians-Universität, München, Germany
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