Selective and potent Type-A CCK receptor agonists of formula (I): X--Y--Z--Q (I) or a pharmaceutically acceptable salt thereof, wherein, X is selected from ##STR1## Y is selected from ##STR2## Z is ##STR3## and Q is ##STR4## or pharmaceutically-acceptable salts thereof, useful in the treatment of gastrointestinal disorders (including gallbladder disorders), central nervous system disorders, insulin-related disorders and pain, as well as in appetite regulation.
Synthesis and biological activity of angiotensin II analog containing a Val-His replacement, Val.psi.[CH(CONH2)HN]His
作者:Raju Mohan、Yuo Ling Chou、Ron Bihovsky、William C. Lumma、Paul W. Erhardt、Kenneth J. Shaw
DOI:10.1021/jm00112a014
日期:1991.8
The dipeptide mimic Val psi[CH(CONH2)NH]His (4) was incorporated into angiotensin II (AII) analogues to provide an octapeptide saralasin derivative (29) as well as tetrapeptide analogue 19. Three C-terminal tetrapeptides (21, 25, and 28) were also prepared. All compounds were tested for their ability to displace 3H-AII from rabbit adrenal gland homogenate and as antagonists of AII and AI on guinea
The invention relates to novel polyalkylene glycol compounds and methods of using them. In particular, compounds comprising a novel polyethylene glycol conjugate are used alone, or in combination with antiviral agents to treat a viral infection, such as chronic hepatitis C.
The invention relates to novel polyalkylene glycol compounds and methods of using them. In particular, compounds comprising a novel polyethylene glycol conjugate are used alone, or in combination with antiviral agents to treat a viral infection, such as chronic hepatitis C.
Development of potent and selective CCK-A receptor agonists from Boc-CCK-4: tetrapeptides containing Lys(N.epsilon.)-amide residues
作者:Kazumi Shiosaki、Chun Wel Lin、Hana Kopecka、Richard A. Craig、Bruce R. Bianchi、Thomas R. Miller、David G. Witte、Michael Stashko、Alex M. Nadzan
DOI:10.1021/jm00089a010
日期:1992.5
A series of Boc-CCK-4 derivatives represented by the general structure Boc-Trp-Lys(N(epsilon)-COR)-Asp-Phe-NH2, where R is an aromatic, heterocyclic, or aliphatic group, are potent and selective CCK-AT receptor agonists. These amide-bearing compounds complement the previously described urea-based tetrapeptides (Shiosaki et al. J. Med. Chem. 1991, 34, 2837-2842); structure-activity studies revealed parallel as well as divergent trends between these two series. A significant correlation was observed between pancreatic binding affinity and the resonance constant R of the phenyl substituent in one particular series of derivatives. Sulfation of phenolic amides appended onto the epsilon-amino group of the lysine did not affect affinity for the CCK-AT receptor in contrast to the 500-fold increase in binding potency observed upon sulfation of CCK-8, suggesting that the lysine appendage and the sulfated tyrosine in CCK-8, both key structural elements that impart high affinity for the CCK-A receptor, are interacting differently with the receptor. The amide-bearing tetrapeptides are full agonists relative to CCK-8 in stimulating pancreatic amylase release while being partial agonists in eliciting phosphoinositide (PI) hydrolysis. Both effects were blocked by selective CCK-A receptor antagonists.