Beta-lactam antibiotic reduces morphine analgesic tolerance in rats through GLT-1 transporter activation.

Beta-lactam antibiotic reduces morphine analgesic tolerance in rats through GLT-1 transporter activation.
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DOI:
10.1016/j.drugalcdep.2009.10.010
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发表时间:
2010-03-01
影响因子:
4.2
通讯作者:
Patel D
Patel D
中科院分区:
医学2区
文献类型:
--
作者:
Rawls SM;Zielinski M;Patel H;Sacavage S;Baron DA;Patel D

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谷氨酸转运子亚型1(GLT-1)的激活是一个有前途的-和未充分研究-的方法来管理方面的吗啡耐受性增加的多巴胺能传输所造成的。β-内酰胺抗生素作为激活GLT-1转运蛋白的药物的鉴定促使我们假设重复β-内酰胺抗生素(头孢曲松)给药通过GLT-1激活阻断对吗啡抗伤害感受耐受性的发展。在这里,我们给大鼠注射吗啡(10 mg/kg,s.c.)每天两次,持续7天以诱导耐受性,并使用热板测定法测定重复施用吗啡的第1、4和7天的抗伤害感受。头孢曲松和选择性GLT-1转运蛋白抑制剂二氢红藻氨酸盐(DHK)与吗啡共同给药,以确定GLT-1激活是否介导头孢曲松的作用。耐受性出现在重复吗啡给药的第4天和第7天。头孢曲松(50、100或200 mg/kg,腹腔注射)施用剂量依赖性地阻断吗啡耐受性的发展。DHK(10 mg/kg,皮下注射),在每次吗啡注射前15分钟给药,防止了头孢曲松(200 mg/kg,i. p.)对吗啡耐受性的抑制。这些结果确定了阿片类药物耐受大鼠中头孢曲松和吗啡之间的相互作用,并表明β-内酰胺类抗生素在慢性吗啡暴露期间保持镇痛功效。
Glutamate transporter subtype 1 (GLT-1) activation is a promising – and understudied - approach for managing aspects of morphine tolerance caused by increased glutamatergic transmission. Identification of beta-lactam antibiotics as pharmaceuticals which activate GLT-1 transporters prompted us to hypothesize that repeated beta-lactam antibiotic (ceftriaxone) administration blocks development of tolerance to morphine antinociception through GLT-1 activation. Here, we injected rats with morphine (10 mg/kg, s.c.) twice daily for 7 days to induce tolerance and used the hot-plate assay to determine antinociception on days 1, 4 and 7 of repeated morphine administration. Ceftriaxone and a selective GLT-1 transporter inhibitor dihydrokainate (DHK) were co-administered with morphine to determine if GLT-1 activation mediated the ceftriaxone effect. Tolerance was present on days 4 and 7 of repeated morphine administration. Ceftriaxone (50, 100 or 200 mg/kg, i.p.) administration dose-dependently blocked development of morphine tolerance. DHK (10 mg/kg, s.c.), administered 15 min before each morphine injection, prevented inhibition of morphine tolerance by ceftriaxone (200 mg/kg, i.p.). These results identify an interaction between ceftriaxone and morphine in opioid-tolerant rats and suggest beta-lactam antibiotics preserve analgesic efficacy during chronic morphine exposure.
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