Long-lasting blocking of interoceptive effects of cocaine by a highly efficient cocaine hydrolase in rats.

Long-lasting blocking of interoceptive effects of cocaine by a highly efficient cocaine hydrolase in rats.
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DOI:
10.1038/s41598-023-50678-0
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发表时间:
2024-01-09
期刊:
影响因子:
4.6
通讯作者:
--
中科院分区:
综合性期刊3区
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--
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可卡因依赖是一个严重的全球性公共卫生问题,没有FDA批准的药物治疗。我们最近设计并发现了一种高效的长效可卡因水解酶CocH 5-Fc(M6)。本研究通过大鼠可卡因辨别实验检测了CocH 5-Fc(M6)阻断可卡因内感受性效应的有效性和持续时间,证明CocH 5-Fc(M6)阻断可卡因辨别的持续时间依赖于可卡因剂量和CocH 5-Fc(M6)血药浓度。特别地,3 mg/kg剂量的CocH 5-Fc(M6)在41、19和10天内有效地减弱10 mg/kg可卡因、10和32 mg/kg可卡因的累积剂量以及10、32和56 mg/kg可卡因的辨别刺激作用≥ 20%,并且在30、13、14、15、16、17、18、19、和5天,相应的阈值血浆CocH 5-Fc(M6)浓度分别为15.9、72.2和221 nM,在此浓度下血液可卡因浓度可忽略不计。此外,基于所获得的数据,可卡因辨别模型比自发活动更敏感地揭示可卡因效应,并且CocH 5-Fc(M6)本身对于大鼠中的行为活动(例如杠杆按压和食物消耗)没有长期毒性,进一步证明CocH 5-Fc(M6)具有作为预防可卡因依赖的有希望的治疗候选物的期望性质。
Cocaine dependence is a serious world-wide public health problem without an FDA-approved pharmacotherapy. We recently designed and discovered a highly efficient long-acting cocaine hydrolase CocH5-Fc(M6). The present study examined the effectiveness and duration of CocH5-Fc(M6) in blocking interoceptive effects of cocaine by performing cocaine discrimination tests in rats, demonstrating that the duration of CocH5-Fc(M6) in blocking cocaine discrimination was dependent on cocaine dose and CocH5-Fc(M6) plasma concentration. Particularly, a dose of 3 mg/kg CocH5-Fc(M6) effectively attenuated discriminative stimulus effects of 10 mg/kg cocaine, cumulative doses of 10 and 32 mg/kg cocaine, and cumulative doses of 10, 32 and 56 mg/kg cocaine by ≥ 20% for 41, 19, and 10 days, and completely blocked the discriminative stimulus effects for 30, 13, and 5 days with corresponding threshold plasma CocH5-Fc(M6) concentrations of 15.9, 72.2, and 221 nM, respectively, under which blood cocaine concentration was negligible. Additionally, based on the data obtained, cocaine discrimination model is more sensitive than the locomotor activity to reveal cocaine effects and that CocH5-Fc(M6) itself has no long-term toxicity regarding behavioral activities such as lever pressing and food consumption in rats, further demonstrating that CocH5-Fc(M6) has the desired properties as a promising therapeutic candidate for prevenance of cocaine dependence.
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