In vitro and in vivo effects of cocaine and selected local anesthetics on the dopamine transporter.

In vitro and in vivo effects of cocaine and selected local anesthetics on the dopamine transporter.
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可卡因和选定的局部麻醉剂对多巴胺转运蛋白的体外和体内影响。

DOI:
10.1016/0014-2999(95)00042-j
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发表时间:
1995
影响因子:
5
通讯作者:
Martin,BR
Martin,BR
中科院分区:
医学2区
文献类型:
--
作者:
Woodward,JJ;Compton,DM;Balster,RL;Martin,BR

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确定所选局部麻醉剂对体外和体内多巴胺转运蛋白活性测量的影响,以研究局部麻醉剂活性在可卡因神经元作用中的作用。可卡因抑制[3H]2-β-甲氧基-3-β-(4-氟苯基)托烷1,5-萘二磺酸盐(CFT)结合和[3H]多巴胺摄取,估计Ki和IC50值分别为0.6 μM和0.7 μM。在测试的局部麻醉剂中,只有二甲卡因显示出 CFT 结合的完全置换(测试为 0-30 μM)和多巴胺摄取的完全抑制(测试为 0-100 μM)。聚美多卡因的效力仅略低于可卡因,对于 [3H]CFT 结合和多巴胺摄取的估计 Kiof 为 1.4 μM,IC50 值为 1.2 μM。在最大浓度为100μM时,含有局麻药普鲁卡因、丁卡因、哌罗卡因的酯和含有局麻药地布卡因和布比卡因的酰胺部分抑制多巴胺摄取47-70%。含有局麻药丙氧卡因的酯和含有局麻药丙胺卡因、依替卡因、普鲁卡因酰胺和利多卡因的酰胺在 100 μM 时抑制多巴胺摄取 8-30%。在透析溶液中给予可卡因、聚美多卡因或普鲁卡因 10 分钟,可使清醒大鼠纹状体的内源性多巴胺流出量出现剂量依赖性、可逆性增加。可卡因和二甲卡因分别在浓度为 0.1 mM 和 1 mM 时使透析液多巴胺增加 12 倍。普鲁卡因 (10 mM) 使透析液多巴胺增加 6 倍,而利多卡因 (1 mM) 则产生可重复且可逆的减少 (30%)。这些结果表明,某些局部麻醉剂(例如聚二甲基硅氧烷和普鲁卡因)的可卡因样作用是由它们的多巴胺摄取抑制剂的直接作用引起的。
The effects of selected local anesthetics on in vitro and in vivo measurements of dopamine transporter activity were determined to investigate the role of local anesthetic activity in the neuronal actions of cocaine. Cocaine inhibited [3H]2-β-carbomethoxy-3-β-(4-fluorophenyl)tropane 1,5-naphthalenedisulfonate (CFT) binding and [3H]dopamine uptake with estimated Kiand IC50values of 0.6 μM and 0.7 μM, respectively. Of the local anesthetics tested, only dimethocaine showed full displacement of CFT binding (0–30 μM tested) and full inhibition of dopamine uptake (0–100 μM tested). Dimethocaine was only slightly less potent than cocaine with an estimated Kiof 1.4 μM and an IC50value of 1.2 μM for [3H]CFT binding and dopamine uptake. At a maximum concentration of 100 μM, the ester containing local anesthetics procaine, tetracaine, piperocaine and the amide containing local anesthetic dibucaine and bupivacaine partially inhibited dopamine uptake by 47–70%. The ester containing local anesthetic propoxycaine and the amide containing local anesthetics prilocaine, etidocaine, procainamide, and lidocaine inhibited dopamine uptake by 8–30% at 100 μM. A 10 min administration of cocaine, dimethocaine, or procaine in the dialysis solution produced dose-dependent, reversible increases in endogenous dopamine efflux from the striata of awake rats. Cocaine and dimethocaine produced similar 12-fold increases in dialysate dopamine at concentrations of 0.1 mM and 1 mM respectively. Procaine (10 mM) produced a 6-fold increase in dialysate dopamine while lidocaine (1 mM) produced a reproducible and reversible decrease (30%). These results show that the cocaine-like actions of certain local anesthetics such as dimethocaine and procaine result from their direct actions of dopamine uptake inhibitors.
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