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Titolo:
The property of a novel V2 receptor mutant in a patient with nephrogenic diabetes insipidus
Autore:
Inaba, S; Hatakeyama, H; Taniguchi, N; Miyamori, I;
Indirizzi:
Fukui Med Univ, Dept Internal Med 3, Fukui 9101193, Japan Fukui Med Univ Fukui Japan 9101193 Internal Med 3, Fukui 9101193, Japan
Titolo Testata:
JOURNAL OF CLINICAL ENDOCRINOLOGY AND METABOLISM
fascicolo: 1, volume: 86, anno: 2001,
pagine: 381 - 385
SICI:
0021-972X(200101)86:1<381:TPOANV>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
VASOPRESSIN V2-RECEPTOR GENE; HUMAN ANTIDIURETIC-HORMONE; MOLECULAR-CLONING; TYPE-2 RECEPTOR; MUTATIONS; EXPRESSION; LOCALIZATION; AFFINITY; CYCLASE; BINDING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Inaba, S Fukui Med Univ, Dept Internal Med 3, 23-1 Shimoaitsuki, Fukui 9101193, Japan Fukui Med Univ 23-1 Shimoaitsuki Fukui Japan 9101193 1193, Japan
Citazione:
S. Inaba et al., "The property of a novel V2 receptor mutant in a patient with nephrogenic diabetes insipidus", J CLIN END, 86(1), 2001, pp. 381-385

Abstract

Nephrogenic diabetes insipidus (NDI) is characterized by resistance of thekidneys to the action of arginine vasopressin (AVP); X-linked recessive NDI is caused by an inactivating mutation of the vasopressin type-2 (V2) receptor. Several missense mutations in the first or second extracellular loop of the V2 receptor have been reported, and some of these mutant receptors were confirmed to have reduced affinities for ligand binding. We detected a novel V2 receptor gene mutation, a substitution of cysteine for arginine-104 (R104C) located in the first extracellular loop of the V2 receptor, in a patient with congenital NDI. Functional analysis by transient expression studies with COS-7 cells showed binding capacity of R104C mutant diminished as 10% of wild type, but binding affinity was strong rather than wild type. In the result of AVP stimulation studies, maximum cAMP accumulation of R104C decreased as 50% of wild type. On the other hand, a designed mutant receptor, substituted serine for arginine-104 as a model of modified R104C mutant receptor removed the influence of the sulfhydryl group in cysteine-104, recovered binding capacity up to 50% of wild type and maximum cAMP accumulation as 82% of wild type. Our study demonstrated that the R104C mutation of the V2 receptor was a cause of NDI. The mechanism of renal resistance to AVP was the reduction of ligand binding, and adenylyl cyclase activation depended on the V2 receptor. In addition, we con fumed that the sulfhydryl group of the cysteine-104 caused most part of R104C mutant receptor dysfunction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 10:41:45