Biological Activity: | Potent neuromedin B receptor antagonist (NMB-R, BB 1 ) (IC 50 = 40 nM) that displays ~ 40-fold selectivity over the gastrin-releasing peptide receptor (GRP-R, BB 2 ) and > 300-fold selectivity over BRS-R (bb 3 ). Antagonizes neuromedin B-stimulated calcium release and inhibits proliferation of rat glioma cells (IC 50 = 2 μ M). |