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Gaillard F, Ould Rabah M, Garcelon N, Touam M, Neuraz A, Legendre C, Anglicheau D, Prié D, Bienaime F. Impact de la fonction du greffon rénal sur la masse musculaire après transplantation. Nephrol Ther 2022. [DOI: 10.1016/j.nephro.2022.07.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Gloux A, Le Roy N, Même N, Piketty ML, Prié D, Benzoni G, Gautron J, Nys Y, Narcy A, Duclos MJ. Increased expression of fibroblast growth factor 23 is the signature of a deteriorated Ca/P balance in ageing laying hens. Sci Rep 2020; 10:21124. [PMID: 33273568 PMCID: PMC7713066 DOI: 10.1038/s41598-020-78106-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 10/09/2019] [Accepted: 10/28/2020] [Indexed: 11/09/2022] Open
Abstract
The present study concerned the effect of ageing in laying hens, from 23 to 90 weeks of age, on the regulation of Ca metabolism related to the requirement for eggshell mineralization. Samples were collected from parathyroid gland (PG), liver, jejunum, medullary bone (MB) and kidney for a quantitative study of candidate gene expression. Although parathyroid hormone (PTH) gene expression in the PG did not vary with age, a stronger challenge to Ca homeostasis was suggested in aged hens. Indeed gene expression of Ca transporters , Vitamin D Receptor (VDR) in the jejunum, and that of transient receptor potential channel subfamily V member 5 (TRPV5) in the kidney decreased. This could exacerbate bone resorption and impair bone accretion, as attested by a higher expression of the Carbonic Anhydrase 2 (CA2) gene and a lower expression of collagen type I alpha 1 chain (COL1A1) in the MB. The increased expression of Fibroblast Growth Factor 23 (FGF23) in the MB likely contributed to the decreased plasma levels of 1.25(OH)2D3 and the altered expression of target genes under its regulation. Our data highlights the molecular mechanisms underlying the osteoporotic syndrome previously documented in aged laying hens, thus providing new perspectives for future interventions.
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Affiliation(s)
- A Gloux
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France
| | - N Le Roy
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France
| | - N Même
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France
| | - M L Piketty
- Service des Explorations Fonctionnelles, G.H. Necker Enfants Malades, Université Paris Descartes Faculté de Médecine, INSERM U11513, 75743, Paris Cedex 15, France
| | - D Prié
- Service des Explorations Fonctionnelles, G.H. Necker Enfants Malades, Université Paris Descartes Faculté de Médecine, INSERM U11513, 75743, Paris Cedex 15, France
| | - G Benzoni
- ADM Animal Nutrition, Talhouët, 56250, Saint-Nolff, France
| | - J Gautron
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France
| | - Y Nys
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France
| | - A Narcy
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France
| | - M J Duclos
- INRAE, Université de Tours, UMR BOA, 37380, Nouzilly, France.
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Gloux A, Le Roy N, Ezagal J, Même N, Hennequet-Antier C, Piketty ML, Prié D, Benzoni G, Gautron J, Nys Y, Narcy A, Duclos MJ. Possible roles of parathyroid hormone, 1.25(OH) 2D 3, and fibroblast growth factor 23 on genes controlling calcium metabolism across different tissues of the laying hen. Domest Anim Endocrinol 2020; 72:106407. [PMID: 32006872 DOI: 10.1016/j.domaniend.2019.106407] [Citation(s) in RCA: 8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 10/08/2019] [Accepted: 10/16/2019] [Indexed: 12/20/2022]
Abstract
This study provides an integrative description of candidate gene expression across tissues involved in calcium (Ca) metabolism during the egg laying cycle, using the well-defined model of Ca supply as fine or coarse particles of calcium carbonate (CaCO3). Plasma and tissue samples were collected from hens at the peak of laying at 0 to 1, 9 to 10, and 18 to 19 h postovulation (PO). After mRNA preparation from the parathyroid gland, medullary bone, liver, kidney, duodenum, and jejunum, gene expressions were quantified using RT-qPCR. The highest levels of parathyroid hormone (PTH) mRNA in the parathyroid gland (P < 0.05), and of the active form of vitamin D3 1.25(OH)2D3 in the plasma (P < 0.01) were observed at 18 to 19 h PO. During this active phase of eggshell formation, bone resorption was attested to high levels of plasma inorganic phosphorus (iP) and the receptor activation of nuclear factor-κB expression in the bone (P < 0.001 and P < 0.05, respectively). At this stage, 5 genes of the transcellular and the paracellular Ca absorption pathways in the intestine (P < 0.05) and the Ca channel transient receptor potential cation channel subfamily V member 5 (P < 0.05), involved in its reabsorption in the kidney, were overexpressed. At 0 to 1 h PO during the subsequent daylight period, 2 candidates of the transcellular and the paracellular Ca pathways (P < 0.05) remained at high levels in the intestine, while calbindin D 28K expression was the highest in the kidney (P < 0.05). As PTH mRNA and 1.25(OH)2D3 were low, bone accretion was likely active at this stage. The phosphaturic hormone fibroblast growth factor 23 (FGF23) was overexpressed at 18 to 19 h PO (P < 0.05) in the bone when plasma iP was high, which suggested a role in the subsequent reduction of P reabsorption in the kidney, as attested to the decreased expression of P cotransporters, leading to iP clearance from the plasma at 0 to 1 h PO (P < 0.05). The low levels of 1.25(OH)2D3 at this stage coincided with increased expression of the 24-hydroxylase gene in the kidney (P < 0.05). In hens fed fine particles of CaCO3, higher plasma levels of 1,25(OH)2D3 and higher expression of several genes involved in bone turnover reflected a stronger challenge to Ca homeostasis. Altogether, these data support the hypothesis that FGF23 could drive vitamin D metabolism in the laying hen, as previously documented in other species and explain the tight link between P and Ca metabolisms.
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Affiliation(s)
- A Gloux
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France.
| | - N Le Roy
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France
| | - J Ezagal
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France
| | - N Même
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France
| | | | - M L Piketty
- Service des Explorations Fonctionnelles, G.H. Necker Enfants Malades, Université Paris Descartes Faculté de Médecine, INSERM U11513, 75743 Paris cedex 15, France
| | - D Prié
- Service des Explorations Fonctionnelles, G.H. Necker Enfants Malades, Université Paris Descartes Faculté de Médecine, INSERM U11513, 75743 Paris cedex 15, France
| | - G Benzoni
- Neovia, Route de Talhouët, 56250 Saint-Nolff, France
| | - J Gautron
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France
| | - Y Nys
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France
| | - A Narcy
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France
| | - M J Duclos
- BOA, INRAE, Université de Tours, 37380 Nouzilly, France.
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Gloux A, Le Roy N, Brionne A, Bonin E, Juanchich A, Benzoni G, Piketty ML, Prié D, Nys Y, Gautron J, Narcy A, Duclos MJ. Candidate genes of the transcellular and paracellular calcium absorption pathways in the small intestine of laying hens. Poult Sci 2020; 98:6005-6018. [PMID: 31328776 PMCID: PMC6771766 DOI: 10.3382/ps/pez407] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [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: 03/05/2019] [Accepted: 06/24/2019] [Indexed: 12/31/2022] Open
Abstract
To meet the high calcium (Ca) demand during eggshell biomineralization (2 g of Ca per egg), laying hens develop specific metabolic regulations to maintain Ca homeostasis. The intake of Ca, its solubilization, and absorption capacity are enhanced at sexual maturity (SM). A better knowledge of the intestinal Ca transporters involved in their variations at this stage could indicate new nutritional strategies to enhance Ca digestive utilization. Transcellular Ca absorption pathway and its major player calbindin-D 28 K (CALB1) mediate a saturable transport, which has been extensively described in this model. Conversely, a contribution by the paracellular pathway involving non-saturable Ca transport through intercellular tight junction has also been suggested. The aim of the present study was to identify candidate genes of these two pathways and their patterns of expression, in immature pullets (12, 15, and 17 wk old) and mature laying hens (23 wk old) in the duodenum, jejunum, and ileum. Using RT-qPCR, this study identifies 3 new candidate genes for transcellular, and 9 for paracellular Ca transport. A total of 5 candidates of the transcellular pathway, transient receptor potential cation channels subfamily C member 1 (TRPC1) and M member 7 (TRPM7); CALB1 and ATPase plasma membrane Ca2+ transporting 1 (ATP2B1) and ATPase plasma membrane Ca2+ transporting 2 (ATP2B2) were enhanced with age or after SM in the duodenum, the jejunum or all 3 segments. A total of 4 candidates of the paracellular pathway Claudin 2 (CLDN2) and tight junction proteins 1, 2, and 3 (TJP1, TJP2 and TJP3) increased in the small intestine after SM. Additionally, CALB1, ATP2B2, and CLDN2 were overexpressed in the duodenum or the jejunum or both segments after SM. The enhanced expression of candidate genes of the paracellular Ca pathway after SM, supports that the non-saturable transport could be a mechanism of great importance when high concentrations of soluble Ca are observed in the intestinal content during eggshell formation. Both pathways may work cooperatively in the duodenum and jejunum, the main sites of Ca absorption in laying hens.
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Affiliation(s)
- A Gloux
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - N Le Roy
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - A Brionne
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - E Bonin
- GeT-PlaGe, INRA, Auzeville, 31326 Castanet-Tolosan, France
| | - A Juanchich
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - G Benzoni
- Prospective and Innovation department, Neovia, 56250 Saint-Nolff, France
| | - M-L Piketty
- Service des Explorations Fonctionnelles, G.H. Necker Enfants Malades, 75743 Paris Cedex 15, France, Université Paris Descartes Faculté de Médecine, INSERM U1151
| | - D Prié
- Service des Explorations Fonctionnelles, G.H. Necker Enfants Malades, 75743 Paris Cedex 15, France, Université Paris Descartes Faculté de Médecine, INSERM U1151
| | - Y Nys
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - J Gautron
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - A Narcy
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
| | - M J Duclos
- BOA, INRA, Université de Tours, 37380 Nouzilly, France
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Heidet L, Biebuyck N, Salomon R, Reklaityte D, Prié D, Vargas-Poussou R. Néphrocalcinose et mutations du gène NPT2c. Arch Pediatr 2016. [DOI: 10.1016/j.arcped.2016.03.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Courbebaisse M, Metzger M, Stengel B, Houillier P, Bankir L, Prié D. FGF23 et copeptine : association et valeur prédictive au cours de la maladie rénale chronique. Nephrol Ther 2015. [DOI: 10.1016/j.nephro.2015.07.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Liabeuf S, Ryckelink J, El Esper N, Urena P, Combe C, Dussol B, Fouque D, Vanhille P, Frimat L, Thervet E, Prié D, Choukroun G. FP409SEVELAMER CARBONATE REDUCES PHOSPHATURIA BUT HAS NO EFFECT ON SERUM C-TERMINAL FIBROBLAST GROWTH FACTOR 23 LEVELS IN STAGE 3B/4 CKD PATIENTS : THE RESULTS OF A FRENCH, MULTICENTER, DOUBLE-BLIND, PLACEBO-CONTROL, RANDOMIZED CLINICAL TRIAL. Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv177.08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Benaboud S, Urien S, Thervet E, Prié D, Legendre C, Souberbielle JC, Hirt D, Friedlander G, Treluyer JM, Courbebaisse M. Détermination du traitement optimal par cholécalciférol chez le patient transplanté rénal : approche de population. Nephrol Ther 2012. [DOI: 10.1016/j.nephro.2012.07.344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Arlet JB, Ribeil JA, Chatellier G, Pouchot J, de Montalembert M, Prié D, Courbebaisse M. [Hyperuricemia in sickle cell disease in France]. Rev Med Interne 2011; 33:13-7. [PMID: 21907467 DOI: 10.1016/j.revmed.2011.07.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 06/14/2011] [Accepted: 07/16/2011] [Indexed: 10/17/2022]
Abstract
PURPOSE Hyperuricemia has been reported to be a common feature of sickle cell disease occurring between 32 to 41% of the patients, in studies conducted during the 1970's. Since then, this notion has been rarely challenged. The objective of this study was to assess the prevalence of hyperuricemia and gout in adult patients with sickle cell disease in France. METHODS Between May 2007 and March 2009, serum and urinary urate concentration, creatininemia and hemogram were prospectively assessed in all consecutive sickle cell patients, followed in our sickle cell disease centre. All subjects were in a clinically steady state. Clinical acute gout history was also recorded. RESULTS Sixty-five patients (mean age 31±10.3 years) were investigated. Mean uric acid serum level was 281.6±74μmol/L. Hyperuricemia was evidenced in six patients only (9.2%) (95% IC: 3.5-19.0). None of the patient had a medical history of acute gout. Patients in the higher serum uric acid tertile concentration had higher serum creatinine level (62.3±17.1μmol/L vs 51.5±12.6μmol/L, P<0.01), lower fractional excretion of urate (4.5% vs 6.8%, P<0.03) and higher reticulocyte count (median 219500/mm(3) vs 144000/mm(3), P=0.08) compared to the other patients. CONCLUSION Hyperuricemia and gout are not a clinical problem in sickle cell disease in our country. Nevertheless, our findings indicate that kidney function has to be fully explored if serum uric acid level is elevated or significantly deteriorates during follow-up. Serum uric acid level could be an early marker of renal dysfunction in sickle cell disease patients.
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Affiliation(s)
- J-B Arlet
- Hôpital européen Georges-Pompidou, université Paris-Descartes, Paris cedex 15, France.
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12
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Courbebaisse M, Ribeil JA, Chatellier G, Prié D, Khira N, Pouchot J, Friedlander G, Arlet JB. Carence en vitamine D et fragilité osseuse chez les patients drépanocytaires adultes. Nephrol Ther 2011. [DOI: 10.1016/j.nephro.2011.07.307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Courbebaisse M, Ribeil JA, Chatellier G, Khira N, Friedlander G, Pouchot J, Prié D, Arlet JB. Prévalence de l’hyperuricémie chez les patients drépanocytaires adultes et facteurs de risque associés. Nephrol Ther 2011. [DOI: 10.1016/j.nephro.2011.07.225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Courbebaisse M, Ribeil JA, Chatellier G, Friedlander G, Khira N, Pouchot J, Prié D, Arlet JB. L’équation CKD-EPI sans l’ajustement par le facteur « race » est la meilleure formule d’estimation du débit de filtration glomérulaire chez les patients drépanocytaires adultes. Nephrol Ther 2011. [DOI: 10.1016/j.nephro.2011.07.222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Arlet J, Ribeil J, Chatellier G, Pouchot J, de Montalembert M, Prié D, Courbebaisse M. La formule CPK-EPI est la meilleure méthode pour estimer le débit de filtration glomérulaire chez les patients drépanocytaires adultes. Rev Med Interne 2011. [DOI: 10.1016/j.revmed.2011.03.117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Arlet JB, Courbebaisse M, Pouchot J, de Montalembert M, Prié D, Ribeil JA. Carence en vitamine D et fragilité osseuse chez les patients drépanocytaires adultes. Rev Med Interne 2009. [DOI: 10.1016/j.revmed.2009.10.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Abstract
Klotho gene mutation leads to a syndrome strangely resembling chronic kidney disease patients undergoing dialysis with multiple accelerated age-related disorders, including hypoactivity, sterility, skin thinning, muscle atrophy, osteoporosis, vascular calcifications, soft-tissue calcifications, defective hearing, thymus atrophy, pulmonary emphysema, ataxia, and abnormalities of the pituitary gland, as well as hypoglycemia, hyperphosphatemia, and paradoxically high-plasma calcitriol levels. Conversely, mice overexpressing klotho show an extended existence and a slow aging process through a mechanism that may involve the induction of a state of insulin and oxidant stress resistance. Two molecules are produced by the klotho gene, a membrane bound form and a circulating form. However, their precise biological roles and molecular functions have been only partly deciphered. Klotho can act as a circulating factor or hormone, which binds to a not yet identified high-affinity receptor and inhibits the intracellular insulin/insulin-like growth factor-1 (IGF-1) signaling cascade; klotho can function as a novel beta-glucuronidase, which deglycosylates steroid beta-glucuronides and the calcium channel transient receptor potential vallinoid-5 (TRPV5); as a cofactor essential for the stimulation of fibroblast growth factor (FGF) receptor by FGF23. The two last functions have propelled klotho to the group of key factors regulating mineral and vitamin D metabolism, and have also stimulated the interest of the nephrology community. The purpose of this review is to provide a nephrology-oriented overview of klotho and its potential implications in normal and altered renal function states.
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Affiliation(s)
- P-Ureña Torres
- Service de Néphrologie et Dialyse, Clinique de l'Orangerie, Aubervilliers, France.
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Dupond JL, Mahammedi H, Prié D, Collin F, Gil H, Blagosklonov O, Ricbourg B, Meaux-Ruault N, Kantelip B. Oncogenic osteomalacia: diagnostic importance of fibroblast growth factor 23 and F-18 fluorodeoxyglucose PET/CT scan for the diagnosis and follow-up in one case. Bone 2005; 36:375-8. [PMID: 15777669 DOI: 10.1016/j.bone.2005.01.001] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2004] [Revised: 01/06/2005] [Accepted: 01/11/2005] [Indexed: 12/17/2022]
Abstract
A case of oncogenic osteomalacia is reported in a 71-year-old man who presented with bone pain, muscle weakness, and severe hypophosphatemia. The tumor which was localized in the left lower mandible was not detected by tomodensitometry, resonance magnetic imaging, and (111)IN-octreotide scintigraphy, but was easily localized by F-18 fluorodeoxyglucose PET/CT SCAN (F-18 FDG PET/CT SCAN). To our knowledge, the value of this technique for detecting tumors in oncogenic osteomalacia has never been reported. Secondly, this case provided an opportunity for confirming the usefulness of serum fibroblast growth factor 23 (FGF23) measurement for the diagnosis and follow-up. We conclude that FGF23 measurements combined with F-18 FDG PET/CT SCAN were decisive tools in a case of oncogenic osteomalacia and are likely to be of considerable importance for facilitating early diagnosis and follow-up in the future.
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Affiliation(s)
- J L Dupond
- Department of Internal Medicine, University Hospital, Boulevard Fleming, 25030 Besançon Cedex, France.
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19
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Abstract
BACKGROUND Dipyridamole (Dip) was previously shown to increase renal phosphate (Pi) reabsorption in humans. However, the mechanism(s) underlying this renal tubular effect is not fully elucidated. It is known that Dip inhibits the activity of the P-glycoprotein (Pgp) multidrug resistance protein 1 (MDR1) expressed on the apical membrane of renal proximal tubular cells where the Na-Pi cotransporter (NPT2) is also expressed. We hypothesized that Dip could increase renal Pi reabsorption by inhibiting Pgp activity. METHODS To test this hypothesis, the effects of Dip, verapamil (Ver), and cyclosporine A (CsA), three unrelated Pgp inhibitors, were studied on the renal Pi reabsorption in rats. RESULTS All three drugs decreased the fractional excretion of Pi (FE(Pi)) in a dose-dependent manner within one hour after beginning the drug infusion, without altering the glomerular filtration rate or serum parathyroid hormone concentration. Sodium-dependent Pi uptake but not Na-glucose transport was increased in brush-border membrane vesicles (BBMVs) when comparing treated with untreated rats. Western blot analysis showed that NPT2 protein was increased in BBMVs from treated rats. Dip and Ver had no effect when applied directly to BBMVs prepared from untreated rats. Pretreatment of rats with colchicine prevented the effects of Dip on the FE(Pi) and NPT2 expression in brush-border membranes. CONCLUSIONS Our results suggest that inhibition of Pgp in the proximal tubule increases Pi uptake and NPT2 translocation to the apical membrane.
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Affiliation(s)
- D Prié
- INSERM U426 and Department of Physiology, Faculté de Médecine Xavier Bichat, Université Paris 7, France.
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20
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Abstract
BACKGROUND Nephrolithiasis is a frequent disorder affecting 10 to 15% of the population in Europe and the United States. More than 80% of renal stones are made of calcium oxalate and calcium phosphate. The main identified risks for calcium renal stone formation are hypercalciuria and urinary saturation. A urine phosphate (Pi) loss is often associated with hypercalciuria; furthermore, hyperphosphaturia increases urinary saturation. METHODS To determine whether urinary phosphate loss is associated with calcium urolithiasis, we measured renal Pi threshold (TmPi) in 207 stone formers with normal parathyroid hormone (PTH) serum concentration and in 105 control subjects. RESULTS The TmPi followed a normal distribution in both groups. The mean TmPi was significantly lower in stone formers versus controls (0.72 +/- 0.13 vs. 0.87 +/- 0.18 mmol/L, P < 0.0001) because of a shift to the left of the TmPi distribution curve in the stone former population, with no evidence for bimodal distribution. Five percent of the controls had a TmPi <0.63 versus 19% of the stone formers. Daily urinary calcium excretion was significantly higher in stone formers than in controls. Calcium excretion was also significantly higher in stone formers with TmPi <0.63 mmol/L compared with those with TmPi > or =0.63. Serum PTH and ionized calcium concentrations were not different in stone formers and in control subjects, whatever the TmPi value. CONCLUSIONS : A low TmPi is more frequently encountered in stone formers with a normal PTH concentration than in control subjects and is associated with a high urinary Ca excretion. The hypophosphatemia induced by a renal phosphate leak may predispose the subject to calcium stone formation by increasing the serum calcitriol level, calcium excretion, and urinary saturation.
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Affiliation(s)
- D Prié
- Department of Physiologie Explorations Fonctionnelles, Hôpital Bichat, Paris, France.
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21
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Pontoglio M, Prié D, Cheret C, Doyen A, Leroy C, Froguel P, Velho G, Yaniv M, Friedlander G. HNF1alpha controls renal glucose reabsorption in mouse and man. EMBO Rep 2000; 1:359-65. [PMID: 11269503 PMCID: PMC1083745 DOI: 10.1093/embo-reports/kvd071] [Citation(s) in RCA: 166] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recently it has been shown that dominant mutations in the human hepatocyte nuclear factor 1alpha (HNF1alpha) gene, encoding for a homeoprotein that is expressed in liver, kidney, pancreas and intestine, result in maturity onset diabetes of the young type 3 (MODY3). HNF1alpha-null mice are diabetic, but at the same time suffer from a renal Fanconi syndrome characterized by urinary glucose loss. Here we show that MODY3 patients are also characterized by a reduced tubular reabsorption of glucose. The renal murine defect is due to reduced expression of the low affinity/high capacity glucose cotransporter (SGLT2). Our results show that HNF1alpha directly controls SGLT2 gene expression. Together these data indicate that HNF1alpha plays a key role in glucose homeostasis in mammals.
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Affiliation(s)
- M Pontoglio
- Unité des Virus Oncogènes, URA 1644 CNRS, Département des Biotechnologies, Institut Pasteur, Paris, France.
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Essig M, Nguyen G, Prié D, Escoubet B, Sraer JD, Friedlander G. 3-Hydroxy-3-methylglutaryl coenzyme A reductase inhibitors increase fibrinolytic activity in rat aortic endothelial cells. Role of geranylgeranylation and Rho proteins. Circ Res 1998; 83:683-90. [PMID: 9758637 DOI: 10.1161/01.res.83.7.683] [Citation(s) in RCA: 218] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
3-Hydroxy-3-methylglutaryl coenzyme A (HMG CoA) reductase inhibitors (HRIs) have been recently shown to prevent atherosclerosis progression. Clinical benefit results from combined actions on various components of the atherosclerotic lesion. This study was designed to identify the effects of HRI on one of these components, the endothelial fibrinolytic system. Aortas isolated from rats treated for 2 days with lovastatin (4 mg/kg body wt per day) showed a 3-fold increase in tissue plasminogen activator (tPA) activity. In a rat aortic endothelial cell line (SVARECs) and in human nontransformed endothelial cells (HUVECs), HRI induced an increase in tPA activity and antigen in a time- and concentration-dependent manner. In SVARECs, the maximal response was observed when cells were incubated for 48 hours with 50 micromol/L HRI. An increase of tPA mRNA was also in evidence. In contrast, HRI inhibited plasminogen activator inhibitor-1 activity and mRNA. The effects of HRI were reversed by mevalonate and geranylgeranyl pyrophosphate, but not by LDL cholesterol and farnesyl pyrophosphate, and were not induced by alpha-hydroxyfarnesyl phosphonic acid, an inhibitor of protein farnesyl transferase. C3 exoenzyme, an inhibitor of the geranylgeranylated-activated Rho protein, reproduced the effect of lovastatin on tPA and plasminogen activator inhibitor-1 activity and blocked its reversal by geranylgeranyl pyrophosphate. The effect of HRI was associated with a disruption of cellular actin filaments without modification of microtubules. A disrupter of actin filaments, cytochalasin D, induced the same effect as lovastatin on tPA, whereas a disrupter of microtubules, nocodazole, did not. In conclusion, HRI can modify the fibrinolytic potential of endothelial cells, likely via inhibition of geranylgeranylated Rho protein and disruption of the actin filaments. The resulting increase of fibrinolytic activity of endothelial cells may contribute to the beneficial effects of HRI in the progression of atherosclerosis.
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Affiliation(s)
- M Essig
- INSERM U 426 and the Department of Physiology, Faculté de Médecine Xavier Bichat, Université Denis Diderot, Paris, France
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23
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Prié D, Blanchet FB, Essig M, Jourdain JP, Friedlander G. Dipyridamole decreases renal phosphate leak and augments serum phosphorus in patients with low renal phosphate threshold. J Am Soc Nephrol 1998; 9:1264-9. [PMID: 9644637 DOI: 10.1681/asn.v971264] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
It has been shown that an acute infusion of dipyridamole increased renal phosphate reabsorption in rats and humans. A prospective study was performed to determine whether chronic treatment by dipyridamole given orally could decrease renal phosphate leak and increase serum phosphorus in patients with idiopathic low renal phosphate threshold (TmPO4/GFR < 0.77 mM). Sixty-four patients with low TmPO4/GFR were included and treated with dipyridamole (75 mg, 4 times daily) for more than 12 mo. Serum phosphorus, TmPO4/GFR, parathyroid hormone, serum calcium, and 1,25-dihydroxyvitamin D were measured sequentially before treatment, and after 3, 6 to 9, and 12 mo of treatment. Under chronic treatment with dipyridamole, TmPO4/GFR and serum phosphorus significantly increased in 80% of patients within 3 mo, with maximal values reached within 9 mo. This improvement persisted after 12 mo of treatment. In 28 patients, 1,25-dihydroxyvitamin D concentrations were above the normal range (> 42 pg/ml) and normalized in parallel with the increase of serum phosphorus. The 24-h calcium excretion (which was initially increased in patients with high vitamin D concentrations) and urolithiasis decreased under treatment. Ionized serum calcium and parathyroid hormone remained unchanged. After 2 yr, treatment was discontinued in three patients; serum phosphorus and TmPO4/GFR decreased within 1 mo after discontinuation. Dipyridamole at a dose of 75 mg 4 times daily increases low TmPO4/GFR and improves hypophosphatemia in patients with renal phosphate losses and can be used to treat these patients.
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Affiliation(s)
- D Prié
- Service de Physiologie-Explorations Fonctionnelles, Hopital Bichat, Assistance Publique-Hôpitaux de Paris, France
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24
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Vrtovsnik F, Couette S, Prié D, Lallemand D, Friedlander G. Lovastatin-induced inhibition of renal epithelial tubular cell proliferation involves a p21ras activated, AP-1-dependent pathway. Kidney Int 1997; 52:1016-27. [PMID: 9328940 DOI: 10.1038/ki.1997.423] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Proliferation of tubular epithelial cells underlies the development of cystic lesions and the subsequent impairment of renal function after renal mass reduction. The effect of HMG CoA reductase inhibitors (HRI) on cell proliferation was investigated in rat renal proximal tubular epithelial cells in primary culture. Treatment of renal tubular epithelial cells with three different HRI reduced fetal calf serum (FCS)-induced [3H]-thymidine incorporation (IC50 values were 0.7 microM, 1.7 microM, and 1.6 microM for simvastatin, lovastatin, and compactin, respectively), and lovastatin blocked BrdUrd incorporation, as assessed by immunocytochemical studies. The proliferative effect of epidermal growth factor (EGF) was similarly abolished by lovastatin. The effect of lovastatin (1 microM) was prevented by 100 microM mevalonate, 5 microM farnesyl-pyrophosphate and 5 microM geranylgeranyl-pyrophosphate (in percent of control value, 31% vs. 102%, 60%, and 82%, respectively) while cholesterol and other products of the mevalonate pathway were inactive. Immunoblot analysis showed that lovastatin decreased membrane-bound p21ras and inhibited FCS-induced c-fos and c-jun protein expression. Furthermore, electrophoretic mobility shift assay demonstrated the functional impairement of AP-1 DNA binding activity in lovastatin-treated cells. In conclusion, these results demonstrate that HRI are antiproliferative in epithelial tubule cells and that this effect is exerted, at least in part, via inhibition of the p21ras-activated and AP-1 dependent mitogenic cascade.
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Affiliation(s)
- F Vrtovsnik
- Department of Physiology, Faculté de Médecine Xavier-Bichat, Université Denis-Diderot, Paris, France
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25
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Millul V, Prié D, Géniteau-Legendre M, Verpont MC, Baudouin B, Ronco PM. ANP-stimulated cGMP egression in renal principal cells: abrogation of polarity by SV40 large T. Am J Physiol 1996; 270:C1051-60. [PMID: 8928732 DOI: 10.1152/ajpcell.1996.270.4.c1051] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Egression of atrial natriuretic peptide (ANP)-stimulated guanosine 3', 5'-cyclic monophosphate (cGMP) was compared with that of isoproterenol-stimulated adenosine 3', 5'-cyclic monophosphate (cAMP) in a rabbit collecting duct cell line transformed with a temperature-sensitive strain of simian virus 40 (SV40). At 39.5 degrees C (inactivated large T), cells exhibit major features of principal cells, whereas at 33 degrees C (functional large T) they lose most of their specific properties. When cells were grown on plastic at 39.5 degrees C, both cyclic nucleotides were predominantly released extracellularly via probenecid-sensitive carriers. Probenecid (3mM) reduced the ratios of extracellular cGMP and cAMP by 84 and 70%, respectively. The amount of extracellular cGMP or cAMP ws linearly correlated with the time integral of the intracellular cyclic nucleotide, suggesting first-order kinetics. The apparent first-order rate constant (k) was sixfold greater for cGMP (0.139 +/- 0.037 min-1, n = 3 experiments) than for cAMP (0.022 +/- 0.003(-1), n = 3 experiments). 3-Isobutyl-1-methylxanthine markedly inhibited extrusion of cGMP (k = 0.022 +/- 0.003 min-1), whereas that of cAMP was unchanged. When cells were grown on filters at 39.5 degrees C, both nucleotides were predominantly released in the apical medium but with a greater polarity for cGMP (83 +/- 4%, n = 6 experiments) than for cAMP (60 +/- 6%, n = 3 experiments) and a prevailing apical localization of the probenecid-sensitive carrier. Activation of SV40 large T at 33 degrees C did not alter cyclic nucleotide transport characteristics but abolished the polarity of probenecid-sensitive cyclic nucleotide extrusion. These results suggest a physiological role for luminal cGMP in the rabbit collecting duct and a specific effect of large T on the probenecid-sensitive carrier polarity.
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Affiliation(s)
- V Millul
- Institut National de la Santé et de la Recherche Médicale Unité 64, Hôpital Tenon, Paris, France
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26
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Affiliation(s)
- G Friedlander
- Department of Physiology, Faculté de Médecine Xavier-Bichat, Université Denis-Diderot, Paris, France
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27
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Schuster VL, Lu R, Kanai N, Bao Y, Rosenberg S, Prié D, Ronco P, Jennings ML. Cloning of the rabbit homologue of mouse 'basigin' and rat 'OX-47': kidney cell type-specific expression, and regulation in collecting duct cells. Biochim Biophys Acta 1996; 1311:13-9. [PMID: 8603097 DOI: 10.1016/0167-4889(95)00186-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Monoclonal antibody '4D4' was generated against a gel-purified 43-50 kDa fraction of rabbit erythrocyte (RBC) ghosts. Immunoblots of rabbit RBCs, skeletal muscle, and kidney, and of a rabbit cortical collecting duct cell line (RC.SV3) yielded broad bands of 30-70 kDa that migrated at approximately 31 kDa after deglycosylation. In kidney sections, 4D4 labeled the basal plasma membranes of the proximal tubule, medullary thick ascending limb of Henle, cortical, medullary, and papillary collecting ducts, and papillary surface epithelium, as well as the lateral membranes of alpha and beta-type intercalated cells. Antibody 4D4 was used to clone a full-length kidney cDNA, which predicted a 31 kDa immunoglobulin-like glycoprotein with high homology to mouse 'gp42' or 'basigin', human 'M6' or 'EMMPRIN', rat 'OX-47' or 'CE-9', and avian 'neurothelin', 'HT7', or '5A11'. When heterologously expressed in HeLa cells, glycosylated immunoreactive protein was expressed at the plasma membrane. In the case of the endogenous protein in RC.SV3 cells, interferon-gamma and A23187 decreased, and fetal calf serum increased, steady-state mRNA levels. Thus, this molecule exhibits a high degree of cell type-specific expression in the kidney and undergoes regulation by cytokines and serum in kidney epithelial cells.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antigens, CD
- Antigens, Neoplasm
- Antigens, Surface
- Avian Proteins
- Base Sequence
- Basigin
- Blood Proteins
- Cell Line
- Cell Membrane/chemistry
- Cloning, Molecular
- Erythrocytes/chemistry
- Gene Expression Regulation/physiology
- HeLa Cells
- Humans
- Kidney/chemistry
- Kidney Tubules, Collecting/chemistry
- Kidney Tubules, Collecting/cytology
- Kidney Tubules, Collecting/metabolism
- Membrane Glycoproteins/analysis
- Membrane Glycoproteins/genetics
- Mice
- Molecular Sequence Data
- Molecular Weight
- Muscle, Skeletal/chemistry
- Rabbits
- Rats
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
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Affiliation(s)
- V L Schuster
- Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Prié D, Friedlander G, Coureau C, Vandewalle A, Cassingéna R, Ronco PM. Role of adenosine on glucagon-induced cAMP in a human cortical collecting duct cell line. Kidney Int 1995; 47:1310-8. [PMID: 7637260 DOI: 10.1038/ki.1995.186] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The hormonal responsiveness profile of the cortical collecting duct varies from one species to another. To identify the hormones and agonists that modulate the functions of this tubule segment in the human species, we generated a cell line (HCD) immortalized by SV40 virus. The tubular origin of this cell line was assessed by the expression of collecting duct-specific antigens and the ability of vasopressin to increase by nine-fold cAMP synthesis. Glucagon and adenosine stimulated cAMP synthesis, and atrial natriuretic peptide stimulated cGMP synthesis in a concentration-dependent manner. Bradykinin, adenosine and angiotensin increased intracellular calcium concentration ([Ca2+]i). Because adenosine can regulate tubular functions, we examined its role on glucagon-induced cAMP synthesis. Using adenosine analogs, we demonstrated that HCT cells both expressed adenosine type-2 (A2) receptors which stimulated cAMP production, and adenosine type-1 (A1) receptors linked to [Ca2+]i increase which inhibited glucagon-stimulated cAMP synthesis. The inhibitory effect was abolished by pertussis toxin, and was neither due to [Ca2+]i increase nor to protein kinase C activation, which indicated that some A1 adenosine receptors were directly negatively coupled to adenylyl cyclase. These results suggest that adenosine can modify human cortical collecting duct functions in opposite ways according to the adenosine receptor activated.
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Affiliation(s)
- D Prié
- INSERM U251, Faculté de Médecine Xavier Bichat, Paris, France
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29
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Siegfried G, Vrtovsnik F, Prié D, Amiel C, Friedlander G. Parathyroid hormone stimulates ecto-5'-nucleotidase activity in renal epithelial cells: role of protein kinase-C. Endocrinology 1995; 136:1267-75. [PMID: 7867581 DOI: 10.1210/endo.136.3.7867581] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
PTH-induced phosphaturia is exerted in part by cAMP added to the renal tubular lumen under the influence of the hormone. Modulation of renal phosphate transport by luminal cAMP requires degradation of the nucleotide into adenosine by brush-border membrane ectoenzymes, among them ecto-5'-nucleotidase (5'-NU). Hormonal modulation of 5'-NU activity was evaluated in cultured opossum kidney cells. PTH (1-100 nM) stimulated 5'-NU in a time-, concentration-, and protein synthesis-dependent manner. The effect of PTH-(1-34) was mimicked by PTH-(3-34), which does not activates adenylate cyclase, and by phorbol 12-myristate 13-acetate (PMA), but not by forskolin or (Bu)2cAMP. Down-regulation or pharmacological inhibition of protein kinase-C (PKC) abolished the effect of PTH fragments and PMA. PTH fragments increased intracellular Ca2+ and translocated PKC activity to the membrane. PTH or PMA did not affect 5'-NU messenger RNA content. Inhibition of sodium-phosphate cotransport by extracellular cAMP was decreased by 5'-NU inhibition and was magnified by PTH. These results indicate that 1) PTH stimulates 5'-NU activity in renal proximal tubular cells in a manner involving PKC activation and de novo protein synthesis; and 2) this effect participates in PTH modulation of renal phosphate transport.
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Affiliation(s)
- G Siegfried
- Department of Physiology, Faculté de Médecine Xavier-Bichat, Université Denis-Diderot-Paris, France
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30
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31
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Piédagnel R, Prié D, Cassingéna R, Ronco P, Lelongt B. SV40 large-T oncogene inhibits transcription of perlecan-related proteoglycans but stimulates hyaluronan synthesis in a temperature-sensitive renal-tubule principal cell line. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32464-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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32
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Piédagnel R, Prié D, Cassingéna R, Ronco PM, Lelongt B. SV40 large-T oncogene inhibits transcription of perlecan-related proteoglycans but stimulates hyaluronan synthesis in a temperature-sensitive renal-tubule principal cell line. J Biol Chem 1994; 269:17469-76. [PMID: 8021252] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We have analyzed the effects of SV40 large-T oncogene on proteoglycan (PG) synthesis in a temperature-sensitive SV40-transformed renal cell line. Cells shifted from permissive (33 degrees C) to restrictive (39.5 degrees C) temperature, acquired within 48 h the phenotype of principal cells of the renal collecting tubule. They then synthesized hyaluronan, a large-sized PG, small amounts of free GAG chains, and a major approximately 130-kDa heparan sulfate-PG. Sulfated PGs were localized in a basement membrane-like layer and possessed the same core protein (61-70 kDa) derived from perlecan. Expression of large-T oncogene at the permissive temperature induced dramatic alterations of the extracellular matrix, and a 4- and 12-fold reduction in cell-associated and medium-released sulfated PGs, due to a approximately 50% decrease in perlecan mRNA content and gene transcription. This contrasted with a 2-fold increase in actin gene transcription and a 10- and 2-fold rise in the hyaluronan content in cells and medium, respectively. These alterations did not occur in a control cell line (RC.SV3) derived from the same tubule segment but infected with wild-type SV40 strain. They are thus most likely related to the functional state of large-T oncogene and may take part in the early steps of transformation.
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Affiliation(s)
- R Piédagnel
- Institut National de la Santé et de la Recherche Médicale, Unité 64 Hôpital Tenon, Paris, France
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33
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Prié D, Ronco PM, Baudouin B, Géniteau-Legendre M, Antoine M, Piedagnel R, Estrade S, Lelongt B, Verroust PJ, Cassingéna R. Activation of the simian virus 40 (SV40) genome abrogates sensitivity to AVP in a rabbit collecting tubule cell line by repressing membrane expression of AVP receptors. J Cell Biol 1991; 113:951-62. [PMID: 1709172 PMCID: PMC2288981 DOI: 10.1083/jcb.113.4.951] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
To analyze the role of SV40 genome in the phenotypic alterations previously observed in SV40-transformed cell lines, we infected rabbit renal cortical cells with a temperature-sensitive SV40 mutant strain (tsA58) and compared the cell phenotypes at temperatures permissive (33 degrees C) and restrictive (39.5 degrees C) for SV40 genome expression. At both temperatures, the resulting cell line (RC.SVtsA58) expresses cytokeratin and uvomorulin, but epithelial differentiation is more elaborate at 39.5 degrees C as shown by the formation of a well-organized cuboidal monolayer with numerous tight junctions and desmosomes. Functional characteristics are also markedly influenced by the culture temperature: cells grown at 33 degrees C respond only to isoproterenol (ISO, 10(-6) M) by a sevenfold increase in cAMP cell content above basal values; in contrast, when transferred to 39.5 degrees C, they exhibit increased sensitivity to ISO (ISO/basal: 19.1) and a dramatic response to 10(-7) M dDarginine vasopressin (dDAVP/basal: 18.2, apparent Ka: 5 X 10(-9) M) which peaks 48 h after the temperature shift. The latter is associated with membrane expression of V2-type AVP receptors (approximately 50 fmol/10(6) cells) which are undetectable when SV40 genome is activated (33 degrees C). Clonal analysis, additivity studies, and desensitization experiments argue for the presence of a single cell type responsive to both AVP and ISO. The characteristics of the RC. SVtsA58 cell line at 39.5 degrees C (effector-stimulated cAMP profile, lack of expression of brush-border hydrolases and Tamm-Horsfall protein) suggest that it originates from the cortical collecting tubule, and probably from principal cells.
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Affiliation(s)
- D Prié
- Institut National de la Santé et de la Recherche Médicale (INSERM) U.64, Hôpital Tenon, Paris, France
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