TABLE 1

Binding affinity (Ki) values of selected compounds to opioid receptors

Values represent the mean ± S.E.M. of at least three independent determinations.


Compound

Ki (nM)
ORL-1
μ
δ
κ
Nociceptin 0.079 ± 0.021 128.5 ± 7.5 >2500 49.4 ± 9.3
SB-612111 0.33 ± 0.03 57.6 ± 8.0 2109 ± 570 160.5 ± 22.4
SB-612112 1.3 ± 0.23 34.5 ± 5.0 >2500 161 ± 4
JTC-801 30.8 ± 3.0 93.3 ± 32.1 >2500 1659 ± 400
(-)-J-113397 157 ± 41 33.7 ± 2.9 >2500 198 ± 16
(+)-J-113397 2.0 ± 0.7 30.7 ± 7.6 >2500 58.3 ± 6.9
DAMGO >10,000 0.58 ± 0.03 1260 ± 195 185 ± 13
Morphine >10,000 0.70 ± 0.07 336 ± 102 27.1 ± 4.0
DPDPE >5000 200 ± 35.8 6.1 ± 0.6 >10,000
BRL 52656 >10,000 371 ± 32 >2500 0.14 ± 0.03
U-69593 >10,000 510 ± 61 >2500 0.37 ± 0.06
Naloxone
>10,000
0.42 ± 0.05
38.7 ± 9.9
1.21 ± 0.10