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Hyperosmotic NaCl and urea synergistically regulate the expression of the UT-A2 urea transporter in vitro and in vivo. 2000

C Leroy, and G Basset, and G Gruel, and P Ripoche, and M M Trinh-Trang-Tan, and G Rousselet
Service de Biologie Cellulaire, CEA/Saclay, Bâtiment 532, Gif sur Yvette Cedex, 91191, France.

The UT-A2 urea transporter is involved in the recycling of urea through the kidney, a process required to maintain high osmotic gradients. Dehydration increases UT-A2 expression in vivo. The tissue distribution of UT-A2 suggested that hyperosmolarity, and not vasopressin, might mediate this effect. We have analyzed the regulation of UT-A2 expression by ambiant osmolarity both in vitro (mIMCD3 cell line) and in vivo (rat kidney medulla). The UT-A2 mRNA was found to be synergistically up-regulated by a combination of NaCl and urea. Curiously, the UT-A2 protein was undetectable in this hypertonic culture condition, or after transfection of the UT-A2 cDNA, whereas it could be detected in HEK-293 transfected cells. Treating rats with furosemide, a diuretic which decreases the kidney interstitium osmolarity without affecting vasopressin levels, led to decreased levels of the UT-A2 protein. Our results show that the UT-A2 urea transporter is regulated by hyperosmolarity both in vitro and in vivo.

UI MeSH Term Description Entries
D007679 Kidney Medulla The internal portion of the kidney, consisting of striated conical masses, the renal pyramids, whose bases are adjacent to the cortex and whose apices form prominent papillae projecting into the lumen of the minor calyces. Kidney Papilla,Kidney Medullas,Kidney Papillas,Medulla, Kidney,Medullas, Kidney,Papilla, Kidney,Papillas, Kidney
D008297 Male Males
D008562 Membrane Glycoproteins Glycoproteins found on the membrane or surface of cells. Cell Surface Glycoproteins,Surface Glycoproteins,Cell Surface Glycoprotein,Membrane Glycoprotein,Surface Glycoprotein,Glycoprotein, Cell Surface,Glycoprotein, Membrane,Glycoprotein, Surface,Glycoproteins, Cell Surface,Glycoproteins, Membrane,Glycoproteins, Surface,Surface Glycoprotein, Cell,Surface Glycoproteins, Cell
D009994 Osmolar Concentration The concentration of osmotically active particles in solution expressed in terms of osmoles of solute per liter of solution. Osmolality is expressed in terms of osmoles of solute per kilogram of solvent. Ionic Strength,Osmolality,Osmolarity,Concentration, Osmolar,Concentrations, Osmolar,Ionic Strengths,Osmolalities,Osmolar Concentrations,Osmolarities,Strength, Ionic,Strengths, Ionic
D002352 Carrier Proteins Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes. Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D004232 Diuretics Agents that promote the excretion of urine through their effects on kidney function. Diuretic,Diuretic Effect,Diuretic Effects,Effect, Diuretic,Effects, Diuretic
D005665 Furosemide A benzoic-sulfonamide-furan. It is a diuretic with fast onset and short duration that is used for EDEMA and chronic RENAL INSUFFICIENCY. Frusemide,Fursemide,Errolon,Frusemid,Furanthril,Furantral,Furosemide Monohydrochloride,Furosemide Monosodium Salt,Fusid,Lasix
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000096982 Urea Transporters Transmembrane carrier proteins responsible for urea movement across the cell membrane. Urea transporters are divided into renal tubular/testicular type (urea transporter 2 consisting of (UT) A1 to A5, encoded by SLC14A2 gene) and erythrocyte type (urea transporter 2 or UT-B1 encoded by the SLC14A1 gene). In humans mutations on the SLC14A1 gene determines KIDD BLOOD-GROUP SYSTEM. Solute Carrier Family 14,Urea Transporter A,Urea Transporter B,Urea Transporter Protein A,Urea Transporter Protein B,Urea Transporter Proteins,Transporter A, Urea,Transporter B, Urea

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