5'-Guanidinonaltrindole (GNTI) possesses 5-fold greater opioid antagonist potency (K(e)=0.04 nM) and an order of magnitude greater selectivity (selectivity ratios >500) than the prototypical κ-opioid receptor antagonist, norbinaltorphimine, in smooth muscle preparations. Binding and functional studies conducted on cloned human opioid receptors expressed in Chinese hamster ovarian (CHO) cells afforded pA2 values that were comparable to the smooth muscle data. In view of the high selectivity and potency of GNTI, it is a potentially valuable pharmacological tool for opioid research. Copyright (C) 2000 Elsevier Science B.V.
- κ-Opioid receptor