Biological Characterization of the Cloned Kappa-, Delta-, and Mu-Opioid Receptors


Below is a list of the binding potencies of various ligands for the three opioid receptor subtypes. This data was compiled in the following paper:

Raynor K, Kong H, Chen Y, Yasuda K, Yu L, Bell GI, Reisine T Pharmacological characterization of the cloned kappa-, delta-, and mu-opioid receptors. Mol Pharmacol 45 : 330-334 (1994)

LigandKi, nm
Delta Receptor
[3H]naltrindole
Kappa Receptor
[3H]U-69,593
Mu Receptor
[3H]DAMGO
Delta-selective Agonists
Leu-enkephalin4.0>1000 3.4
Met-enkephalin1.7>1000 0.65
Deltorphin II3.3>1000 >1000
DADLE0.74>100016
DPDPE14>1000 >1000
DSLET4.8>100039
BW373U860.0131726
SIOM1.7>100033
Delta-selective Antagonists
BNTX0.665518
NTB0.0131312
Naltrindole0.026664
Kappa-selective Agonists
Dynorphin A>10000.5 32
(+)Bremazocine2.30.089 0.75
EKC1010.403.1
U-50,488>10000.12 >1000
Spiradoline>10000.036 21
U-69,593>10000.59 >1000
Kappa-selective Antagonists
Nor-BNI650.0272.2
Mu-selective Agonists
Beta-endorphin1.0521.0
Dermorphin>1000>1000 0.33
DAMGO>1000>1000 2.0
PL017>1000>1000 30
Fentanyl>1000255 0.39
Morphine>100053814
Sufentanyl50750.15
Mu-selective Antagonists
CTOP>1000>1000 0.18
Beta-FNA *482.80.33
Naloxonazine8.6110.054
Non-selective Agonists
Etorphine1.40.130.23
Levorphanol5.06.50.086
Methadone>1000>1000 0.72
Non-selective Antagonists
Diprenorphine0.230.017 0.072
(-)-Naloxone172.30.93
Naltrexone1493.91.0
Beta-CNA *1150.0830.90
Mixed Agonists/Antagonists
Nalbuphine>10003.9 11
Nalorphine1481.10.97
*-Beta-FNA and Beta-CNA are electrophilic affinity labels. The Ki reflects both the reversible and irreversible binding components.