Characterization of [3H]MEN 11420, a novel glycosylated peptide antagonist radioligand of the tachykinin NK2 receptor.
[3H]MEN 11420, a radiolabeled glycosylated peptide antagonist of the tachykinin NK2 receptor, has been investigated in ligand-receptor binding assays using membranes of CHO cells transfected with the human tachykinin NK2 receptor. [3H]MEN 11420 bound to a single class of high affinity binding sites: its binding was inhibited by natural tachykinins (potency ranking: NKA >> SP > or = NKB), as well as by peptide (MEN 11420 > MEN 10376 >> R 396) and nonpeptide (SR 48968 > GR 159897) selective NK2 receptor antagonists. These data indicate that [3H]MEN 11420 is a potent radioligand for the human tachykinin NK2 receptor that may represent a useful tool for studying ligand-receptor interactions at the molecular level.
Renzetti
A R
AR
Department of Pharmacology, Menarini Ricerche S.p.A., Florence, Italy.
Catalioto
R M
RM
Criscuoli
M
M
Cucchi
P
P
Lippi
A
A
Guelfi
M
M
Quartara
L
L
Maggi
C A
CA
D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D016466:CHO Cells; D006224:Cricetinae; D006801:Humans; D007700:Kinetics; D010456:Peptides, Cyclic / Q000378:metabolism*; D011869:Radioligand Assay; D018041:Receptors, Neurokinin-2 / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D015320:Tachykinins / Q000378:metabolism / Q000494:pharmacology; D014162:Transfection
C107754:MEN 11420; D010456:Peptides, Cyclic; D018041:Receptors, Neurokinin-2; D015320:Tachykinins