title: 2-O-alkyltyrosine derivatives of 1-deamino-arginine-vasopressin: highly specific and potent antidiuretic agonists.
abstract: We report the solid-phase synthesis of eight 2-O-alkyltyrosine analogues of 1-deamino-arginine-vasopressin (dAVP) with enhanced antidiuretic agonistic specificity. These peptides are as follows: 1-deamino[2-O-methyltyrosine]-arginine-vasopressin (dTyr(Me)AVP), 1-deamino[2-O-ethyltyrosine]arginine-vasopressin (dTyr(Et)AVP), 1-deamino[2-O-methyltyrosine,8-D-arginine]vasopressin (dTyr(Me)DAVP), 1-deamino[2-O-ethyltyrosine,8-D-arginine]vasopressin (dTyr(Et)DAVP), 1-deamino[2-O-methyltyrosine,4-valine]arginine-vasopressin (dTyr(Me)VAVP), 1-deamino[2-O-ethyltyrosine,4-valine]arginine-vasopressin (dTyr(Et)VAVP), 1-deamino[2-O-methyltyrosine,4-valine,8-D-arginine]vasopressin (dTyr(Me)VDAVP), and 1-deamino[2-O-ethyltyrosine,4-valine,8-D-arginine]vasopressin (dTyr(Et)VDAVP). All analogues were tested for antidiuretic, antivasopressor, and antioxytocic activities. Deamination, as was expected, significantly enhanced the antidiuretic properties of these analogues relative to their parent N-amino-O-alkyltyrosine peptides. With the exception of dTyr(Me)AVP, all of these analogues are antagonists of the vasopressor responses to AVP and of the uterine response to oxytocin. Thus they all exhibit high antidiuretic agonistic specificity. Due to its remarkable properties, dTyr(Me)VDAVP is a unique compound in this series. It appears to be the most potent antidiuretic agonist (1740 units/mg) and also a vasopressor antagonist and a potent oxytocin antagonist. It is thus a highly specific antidiuretic agonist. In general, all of these new analogues are highly specific and thus are potentially useful as pharmacological tools and clinical agents.
authors.affiliation: Department of Biochemistry, Medical College of Ohio, Toledo 43699.
authors.forename: B
authors.initials: B
authors.lastname: Lammek
authors.forename: K
authors.initials: K
authors.lastname: Bankowski
authors.forename: A
authors.initials: A
authors.lastname: Misicka
authors.forename: M
authors.initials: M
authors.lastname: Manning
authors.forename: J
authors.initials: J
authors.lastname: Seto
authors.forename: W H
authors.initials: WH
authors.lastname: Sawyer
mesh_terms: D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D003894:Deamino Arginine Vasopressin / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D004231:Diuresis / Q000187:drug effects*; D005260:Female; D010121:Oxytocin / Q000037:antagonists & inhibitors; D051381:Rats; D013329:Structure-Activity Relationship; D014443:Tyrosine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology
chemical_list: D014443:Tyrosine; D010121:Oxytocin; D003894:Deamino Arginine Vasopressin