Effect of repeated administration of various doses of cocaine and WIN 35,065-2 on locomotor behavior of mice.

Effect of repeated administration of various doses of cocaine and WIN 35,065-2 on locomotor behavior of mice.
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重复施用不同剂量的可卡因和 WIN 35,065-2 对小鼠运动行为的影响。

DOI:
10.1016/0014-2999(86)90184-6
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发表时间:
1986
影响因子:
5
通讯作者:
Reith,ME
Reith,ME
中科院分区:
医学2区
文献类型:
--
作者:
Reith,ME

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每天给予可卡因和可卡因类似物 WIN 36,065-2,持续 3 或 4 天。两种化合物均对其运动刺激作用产生敏感性,并具有相似形状的剂量反应曲线。可卡因的最佳致敏剂量为每天 25 mg/kg,WIN 35,065-2 的最佳致敏剂量为 3 mg/kg。在 40 mg/kg 剂量下,可卡因在第 3 天产生的运动刺激比第 1 天要少。使用 6 和 10 mg/kg 剂量的 WIN 35,065-2,观察到对运动刺激的耐受性。观察者的监测显示,在服用 40 mg/kg 可卡因后,动物在第 3 天和第 1 天花费大约相同的时间来表达非走动行为,如咬、嗅、站立或休息。因此,在第 3 天期间,非走动行为没有增加,而这种增加可能导致活动监测仪测量到的运动刺激减少。我们通过重复施用局部麻醉药物丁卡因、利多卡因、去甲可卡因和苯甲酰假托品在 3 天内测量动力减退效应,评估了可卡因样化合物的局部麻醉作用可能参与抑制运动。这些化合物在第 1 天和第 3 天具有相同的动力抑制作用,表明每日高剂量可卡因和 WIN 35,065-2 观察到的运动刺激减少涉及除局部麻醉作用之外的机制。目前的结果表明,精神兴奋剂的剂量大小是研究其对运动行为影响的敏感性的剂量方案中的一个关键变量。
Cocaine and a cocaine analog, WIN 36,065-2, were administered daily for 3 or 4 days. Both compounds developed sensitization to their locomotor stimulatory effects, with similarly shaped dose-response curves. Dosages giving optimal sensitization were 25 mg/kg per day for cocaine and 3 mg/kg for WIN 35,065-2. At 40 mg/kg, cocaine produced less stimulation of locomotion on day 3 than on day 1. With doses of 6 and 10 mg/kg of WIN 35,065-2, tolerance to locomotor stimulation was observed. Monitoring by an observer revelead that after 40 mg/kg of cocaine the animals spent about the same amount of time expressing non-ambulatory behavior such as biting, sniffing, rearing, or resting on day 3 as on day 1. Therefore, in the 3 day period there was no increase in non-ambulatory behavior that could have produced the decrease in locomotor stimulation measured with the activity monitor. We assessed the possible involvement of the local anesthetic action of cocaine-like compounds in inhibiting locomotion by measuring the hypomotive effect over a 3 day period by repeated administration of the local anesthetic drugs tetracaine, lidocaine, norcocaine and benzoylpseudotropine. These compounds had the same hypomotive effects on day 1 and 3, suggesting that the decrements in locomotor stimulation observed with daily high doses of cocaine and WIN 35,065-2 involve mechanisms other than their local anesthetic action. The present results indicate that the size of the dose of a psychostimulant is a crucial variable in dosage schedules for studying the sensitization to its effect on locomotor behavior.
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去甲可卡因对小鼠的运动抑制不涉及中枢 α2 肾上腺素或多巴胺受体
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