RT Journal Article
SR Electronic
T1 Ro 25-1553: a novel, long-acting vasoactive intestinal peptide agonist. Part I: In vitro and in vivo bronchodilator studies.
JF Journal of Pharmacology and Experimental Therapeutics
JO J Pharmacol Exp Ther
FD American Society for Pharmacology and Experimental Therapeutics
SP 1282
OP 1288
VO 270
IS 3
A1 M O'Donnell
A1 R J Garippa
A1 N Rinaldi
A1 W M Selig
A1 B Simko
A1 L Renzetti
A1 S A Tannu
A1 M A Wasserman
A1 A Welton
A1 D R Bolin
YR 1994
UL http://jpet.aspetjournals.org/content/270/3/1282.abstract
AB Ro 25-1553, a cyclic peptide analog of vasoactive intestinal peptide (VIP), was designed to overcome many of the deficiencies inherent in this natural neuropeptide. On isolated guinea pig tracheal smooth muscle, Ro 25-1553 produces concentration-dependent relaxation of contractile responses to a number of different spasmogens. Depending on the contractile stimulus, Ro 25-1553 is 24 to 89 times more potent than VIP as a relaxant of guinea pig trachea. The high potency of Ro 25-1553 extends to studies on isolated, histamine-contracted, human bronchial smooth muscle, where Ro 25-1553 exhibits a 390-fold enhancement over native VIP and is more potent than other bronchodilating drugs, such as the beta 2-adrenoceptor agonists isoproterenol and salbutamol. Ro 25-1553 was shown to displace the radioligand 125I-VIP from rat forebrain membranes with an IC50 value of 4.98 nM, thereby demonstrating that it acts at a VIP receptor. In addition, when tested in a battery of 40 other binding assays (e.g., muscarinic, histamine, LTs, Ca++, TxA2, endothelin, alpha and beta adrenergic, platelet-activating factor, neurokinins, etc.) at concentrations as high as 10 microM, Ro 25-1553 was found to be inactive; thus it appears to be specific for VIP receptors. The potent smooth muscle relaxant activity exhibited in vitro by Ro 25-1553 is also evident after in vivo intratracheal administration or aerosolization of the compound. Pulmonary responses evoked by histamine, leukotriene D4, platelet-activating factor and acetylcholine are inhibited dose-dependently by intratracheally instilled Ro 25-1553 with nearly identical potency (ED50 values ranging from 0.07 micrograms to 0.26 micrograms).(ABSTRACT TRUNCATED AT 250 WORDS)