Ligands to the (IRAP)/AT4 receptor encompassing a 4-hydroxydiphenylmethane scaffold replacing Tyr2.
Analogues of the hexapeptide angiotensin IV (Ang IV, Val(1)-Tyr(2)-Ile(3)-His(4)-Pro(5)-Phe(6)) encompassing a 4-hydroxydiphenylmethane scaffold replacing Tyr(2) and a phenylacetic or benzoic acid moiety replacing His(4)-Pro(5)-Phe(6) have been synthesized and evaluated in biological assays. The analogues inhibited the proteolytic activity of cystinyl aminopeptidase (CAP), frequently referred to as the insulin-regulated aminopeptidase (IRAP), and were found less efficient as inhibitors of aminopeptidase N (AP-N). The best Ang IV mimetics in the series were approximately 20 times less potent than Ang IV as IRAP inhibitors. Furthermore, it was found that the ligands at best exhibited a 140 times lower binding affinity to the membrane-bound IRAP/AT4 receptor than Ang IV. Although the best compounds still exert lower activities than Ang IV, it is notable that these compounds comprise only two amino acid residues and are considerably less peptidic in character than the majority of the Ang IV analogues previously reported as IRAP inhibitors in the literature.
Andersson
Hanna
H
Department of Medicinal Chemistry, Uppsala University, Box 574, SE-751 23 Uppsala, Sweden.
Demaegdt
Heidi
H
Vauquelin
Georges
G
Lindeberg
Gunnar
G
Karlén
Anders
A
Hallberg
Mathias
M
D000804:Angiotensin II / Q000031:analogs & derivatives* / Q000737:chemistry; D057911:Angiotensin Receptor Antagonists; D000818:Animals; D001559:Benzhydryl Compounds / Q000737:chemistry*; D006224:Cricetinae; D010122:Cystinyl Aminopeptidase / Q000037:antagonists & inhibitors*; D008024:Ligands; D010455:Peptides / Q000494:pharmacology*; D011945:Receptors, Angiotensin; D014443:Tyrosine
C090830:AT4 receptor; D057911:Angiotensin Receptor Antagonists; D001559:Benzhydryl Compounds; D008024:Ligands; D010455:Peptides; D011945:Receptors, Angiotensin; D000804:Angiotensin II; C012877:angiotensin II, des-Asp(1)-des-Arg(2)-Ile(5)-; D014443:Tyrosine; C031961:4-benzylphenol; D010122:Cystinyl Aminopeptidase