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      Secretion of Adrenomedullin by Renal Tubular Cell Lines

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          Adrenomedullin (AM) is a novel and potent vasodilator peptide originally isolated from human pheochromocytoma. The present study was designed to study whether AM is produced by and secreted from renal tubular cell lines and whether arginine vasopressin (AVP) affects AM secretion from these cell lines. Three renal tubular cell lines derived from different species (LLCPK1, MDCK, and MDBK) secrete AM-like immunoreactivity (AM-LI) into culture medium, the immunological and physicochemical properties of which are similar to that of synthetic human AM as evaluated by reverse-phase high-performance liquid chromatography. Among the three cell lines, AVP in combination with a phosphodiesterase inhibitor (isobutylmethylxanthine) stimulated AM-LI secretion most potently from MDCK cells in a time- and dose-dependent manner. In MDCK cells, a V<sub>2</sub> receptor agonist (deamino- D-Arg<sup>8</sup>-vasopressin) dose-dependently stimulated AM-LI secretion in the same manner as AVP. Furthermore, the AVP-induced AM-LI secretion was blocked by a V<sub>2</sub> receptor antagonist (OPC31260), but not by a V<sub>1</sub> receptor antagonist (OPC21268). These data indicate that AM is secreted from renal tubular cell lines and that AVP stimulates AM secretion via V<sub>2</sub> receptors, suggesting its autocrine/paracrine role in renal function.

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          Most cited references 7

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          Cloning and characterization of a vasopressin V2 receptor and possible link to nephrogenic diabetes insipidus.

          The antidiuretic effect of arginine vasopressin (AVP) is mediated by renal-type (V2) receptors linked to adenylyl cyclase. We report here the cloning of the rat kidney V2 AVP receptor complementary DNA that encodes a 370-amino-acid protein with a transmembrane topography characteristic of G protein-coupled receptors, and with similarity to the V1a (hepatic) AVP receptor in its seven membrane-spanning domains. Expression of the cloned cDNA in mammalian cells showed specific ligand binding and activity characteristic of the native V2 AVP receptor. The receptor messenger RNA is detected only in the kidney. The human V2 receptor gene has been localized to the long arm of the X chromosome close to the locus for nephrogenic diabetes insipidus, an X-linked recessive disorder characterized by renal resistance to the antidiuretic action of AVP.
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            Endothelial cells actively synthesize and secrete adrenomedullin.

            This study demonstrates active production of adrenomedullin (AM) in cultured vascular endothelial cells (ECs). To identify the origin of plasma AM and its functional relationship to vascular smooth muscle cells (VSMCs), we checked production of AM in a series of tissues and cell lines and found immunoreactive (ir-) AM in culture media of rat, porcine, human and bovine ECs. Ir-AM was accumulated linearly for up to 48 hours in the culture medium of rat ECs, and the secretion rate of AM was almost comparable to that of endothelin-1. By gel filtration and reverse phase high performance liquid chromatography, ir-AM in the culture medium was shown to have chromatographic behavior indistinguishable from that of synthetic rat AM. By RNA blot analysis of rat tissue, the most highly positive band was detected in cultured ECs, at an intensity 20 to 40 fold higher than that in adrenal gland. Based on these data as well as the presence of AM specific receptor on VSMCs, AM secreted from ECs is deduced to act directly on VSMCs, regulating vascular tone.
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              Molecular cloning and expression of a rat V1a arginine vasopressin receptor.

              The neurohypophyseal hormone arginine vasopressin has diverse actions, including the inhibition of diuresis, contraction of smooth muscle, stimulation of liver glycogenolysis and modulation of adrenocorticotropic hormone release from the pituitary. Arginine vasopressin receptors are G protein-coupled and have been divided into at least three types; the V1a (vascular/hepatic) and V1b (anterior pituitary) receptors which act through phosphatidylinositol hydrolysis to mobilize intracellular Ca2+, and the V2 (kidney) receptor which is coupled to adenylate cyclase. We report here the cloning of a complementary DNA encoding the hepatic V1a arginine vasopressin receptor. The liver cDNA encodes a protein with seven putative transmembrane domains, which binds arginine vasopressin and related compounds with affinities similar to the native rat V1a receptor. The messenger RNA corresponding to the cDNA is distributed in rat tissues known to contain V1a receptors.

                Author and article information

                S. Karger AG
                January 1998
                19 December 1997
                : 78
                : 1
                : 9-14
                a SRL Inc., Tokyo, b Endocrine-Hypertension Division, Second Department of Internal Medicine, Tokyo Medical and Dental University, Tokyo, Japan
                44875 Nephron 1998;78:9–14
                © 1998 S. Karger AG, Basel

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                Page count
                Figures: 6, References: 27, Pages: 6
                Self URI (application/pdf):
                Original Paper

                Cardiovascular Medicine, Nephrology

                Adrenomedullin, Renal cell lines, Arginine vasopressin


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