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- W1990156314 abstract "The continuous intrathecal infusion of morphine (2, 6, 20 nmol/h), sufentanil (0.06, 0.2, 0.6 nmol/h), [D-Ala2,MePhe4, Gly-ol5]enkephalin (DAMGO) (0.1, 0.3, 1.0 nmol/h) or [D-Ala2,D-Leu5]enkephalin (DADLE) (2, 6, 20 nmol/h) in unanesthetized rats produces a dose-dependent increase in hot plate latency 1 day after pump implant followed by a gradual return to baseline values by days 3-4, i.e. tolerance. Rats assessed for opioid dependence after 7 days of intrathecal (i.t.) infusion of opioids show a withdrawal syndrome most readily noted by withdrawal body shakes (WBS) after injection of the opioid antagonist, naloxone (1 mg/kg i.p.). The number of WBS was proportional to the infusion dose of opioid agonist. Although each tolerance-producing agent was infused in one of three log-spaced (low, medium, high) doses, selected to have approximately equal antinociceptive activity across agents, the agents varied in the apparent degree of dependence. Thus, at the highest infusion dose, the average number of WBS observed was greatest for DADLE (32.8), morphine (30.2) and sufentanil (25.0) while animals treated with DAMGO displayed a significantly less degree of opioid dependence (8.7)." @default.
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- W1990156314 date "1989-08-01" @default.
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- W1990156314 title "Magnitude of opioid dependence after continuous intrathecal infusion of μ- and δ-selective opioids in the rat" @default.
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- W1990156314 doi "https://doi.org/10.1016/0014-2999(89)90360-9" @default.
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