TY - JOUR
T1 - Potency of infused spinal antinociceptive agents is inversely related to magnitude of tolerance after continuous infusion
AU - Stevens, C. W.
AU - Yaksh, T. L.
PY - 1989
Y1 - 1989
N2 - By employing a constant-rate (1 μl/hr) constant-dose intrathecal infusion pump in rats, groups received a 7-day infusion of one of three concentrations (in nmol/hr) of each of the following receptor preferring ligands: morphine (mu: 2, 6, 20), sufentanil (mu: 0.06, 0.2, 0.6), DAMGO (mu: 0.1, 0.3, 1.0), DADLE (delta: 2, 6, 20) or ST-91 (alpha-2: 3, 10, 30). On day 7 the magnitude of tolerance was assessed by establishing i.t. dose-response curves for the effect of the chronic drug given as a bolus. Each infused animal was used for one bolus injection. It was observed that for all drugs, a parallel rightward shift in the dose-response curve was produced with the degree of shift proportional to the log of the infusion dose. Of particular significance was the finding that drugs differed significantly in the magnitude of the shift produced by the chronic infusion of equieffective concentrations. Thus, at the intermediate infusion dose, the degree of the shift in the bolus dose-response curve (i.e., magnitude of tolerance) for morphine, DADLE, ST-91, DAMGO and sufentanil was 55, 46, 29, 7 and 2, respectively. These data are interpreted to suggest that agents with high potency and a significant receptor reserve will produce a smaller shift in the dose-response curve (e.g., sufentanil and DAMGO) than the similar infusion of an equieffective dose of another agent with less potency and a smaller population of spare receptors (morphine).
AB - By employing a constant-rate (1 μl/hr) constant-dose intrathecal infusion pump in rats, groups received a 7-day infusion of one of three concentrations (in nmol/hr) of each of the following receptor preferring ligands: morphine (mu: 2, 6, 20), sufentanil (mu: 0.06, 0.2, 0.6), DAMGO (mu: 0.1, 0.3, 1.0), DADLE (delta: 2, 6, 20) or ST-91 (alpha-2: 3, 10, 30). On day 7 the magnitude of tolerance was assessed by establishing i.t. dose-response curves for the effect of the chronic drug given as a bolus. Each infused animal was used for one bolus injection. It was observed that for all drugs, a parallel rightward shift in the dose-response curve was produced with the degree of shift proportional to the log of the infusion dose. Of particular significance was the finding that drugs differed significantly in the magnitude of the shift produced by the chronic infusion of equieffective concentrations. Thus, at the intermediate infusion dose, the degree of the shift in the bolus dose-response curve (i.e., magnitude of tolerance) for morphine, DADLE, ST-91, DAMGO and sufentanil was 55, 46, 29, 7 and 2, respectively. These data are interpreted to suggest that agents with high potency and a significant receptor reserve will produce a smaller shift in the dose-response curve (e.g., sufentanil and DAMGO) than the similar infusion of an equieffective dose of another agent with less potency and a smaller population of spare receptors (morphine).
UR - http://www.scopus.com/inward/record.url?scp=0024307551&partnerID=8YFLogxK
M3 - Article
C2 - 2526212
AN - SCOPUS:0024307551
SN - 0022-3565
VL - 250
SP - 1
EP - 8
JO - Journal of Pharmacology and Experimental Therapeutics
JF - Journal of Pharmacology and Experimental Therapeutics
IS - 1
ER -