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蛋白质 - 热量营养不良对大鼠地塞米松药代动力学、胎盘转运及组织定位的影响。

Influence of protein-calorie malnutrition on the pharmacokinetics, placental transfer and tissue localization of dexamethasone in rats.

作者信息

Varma D R, Yue T L

出版信息

Br J Pharmacol. 1984 Sep;83(1):131-7. doi: 10.1111/j.1476-5381.1984.tb10127.x.

Abstract

The influence of protein-calorie malnutrition (PCM) on the pharmacokinetics, transplacental passage and tissue localization of dexamethasone was determined in Sprague-Dawley rats. PCM increased the plasma half-life and volume of distribution of dexamethasone in pregnant but not in nonpregnant rats. Ratios of foetal to maternal serum dexamethasone concentrations were 0.2-0.4 at different dose levels (0.8-20 mumol kg-1), time intervals (0.25-12 h) and gestational ages (day 14-21). PCM increased the foetal serum and tissue concentrations of dexamethasone but exerted no significant effect on its binding to maternal and foetal serum proteins or on its metabolism by the placenta. It is suggested that significantly lower foetal than maternal serum levels of dexamethasone are due to efficient elimination of this agent by the foeto-placental unit and an impairment of this mechanism may account for the observed increase in dexamethasone levels in the foetuses of PCM rats.

摘要

在斯普拉格-道利大鼠中测定了蛋白质-热量营养不良(PCM)对地塞米松的药代动力学、经胎盘转运及组织定位的影响。PCM增加了地塞米松在妊娠大鼠而非未妊娠大鼠中的血浆半衰期和分布容积。在不同剂量水平(0.8 - 20 μmol kg⁻¹)、时间间隔(0.25 - 12小时)及胎龄(第14 - 21天)时,胎儿与母体血清地塞米松浓度之比为0.2 - 0.4。PCM增加了地塞米松在胎儿血清及组织中的浓度,但对其与母体和胎儿血清蛋白的结合或胎盘对其代谢均无显著影响。提示胎儿血清地塞米松水平显著低于母体血清水平是由于胎儿-胎盘单位对该药物的有效清除,而这种机制的损害可能是PCM大鼠胎儿中地塞米松水平升高的原因。

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