(a) Comparative antinociceptive
properties of the most efficient dual inhibitors 7B to
9B and kelatorphan on the hot plate test in mice
(55°C ± 0.5) (jump response) measured 15 min after ICV
administration of the compounds. Each points represents the percentage
of analgesia ± SEM (n = 10 mice). ∗,
P < 0.05; ∗∗, P < 0.01;
∗∗∗, P < 0.001 (Dunnett’s t
test). (a) Comparative antinociceptive
effects of compound 9B and kelatorphan in the writhing test
in mice (n = 10 mice). The drugs were injected ICV
at the doses indicated 15 min before testing. The results are expressed
as percentage of analgesia ± SEM. ∗∗, P
< 0.01; ∗∗∗, P < 0.001 (Dunnett’s
t test).