Role of water channel AQP-CD in water retention in SIADH and cirrhotic rats.
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| Abstract |
We determined whether aquaporin of collecting duct (AQP-CD) is involved in pathogenesis of water retention in rats with experimental models of syndrome of inappropriate secretion of antidiuretic hormone (SIADH) and liver cirrhosis. SIADH rats were made by administering 1-desamino-8-D-arginine vasopressin (DDAVP) subcutaneously and providing them with a liquid diet. Serum Na levels decreased to < 120 meq/l on day 2, and hyponatremia persisted throughout the rest of observation period. Six hours after the DDAVP infusion, the expression of AQP-CD mRNA significantly increased by 198%, followed by > 144% increases in its expression during the 14-day observation period. On day 7, the increased expression of AQP-CD mRNA was abolished after the administration of an antidiuretic, nonpeptide arginine vasopressin (AVP) antagonist, OPC-31260, which was closely related to a marked diuresis and a prompt normalization of serum Na levels in SIADH rats. Rats were made cirrhotic by injecting a mixture of carbon tetrachloride and olive oil subcutaneously for 3 mo. The expression of AQP-CD mRNA was increased by 164% in the decompensated cirrhotic rats. The blockade of AVP action by OPC-31260 significantly diminished its expression. These results indicate that water channel AQP-CD plays an important role in water retention in pathological states of SIADH and liver cirrhosis.
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| Authors | N Fujita, S E Ishikawa, S Sasaki, G Fujisawa, K Fushimi, F Marumo, T Saito |
| Journal | The American journal of physiology (Am J Physiol) Vol. 269 Issue 6 Pt 2 Pg. F926-31 (Dec 1995) ISSN: 0002-9513 [Print] United States |
| PMID | 8594889 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
| Chemical References |
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