Effect of dexamethasone on fetal hepatic glutamine-glutamate exchange.

Effect of dexamethasone on fetal hepatic glutamine-glutamate exchange.
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地塞米松对胎儿肝脏谷氨酰胺-谷氨酸交换的影响。

DOI:
10.1152/ajpendo.2000.278.5.e839
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发表时间:
2000
期刊:
American journal of physiology. Endocrinology and metabolism.
影响因子:
--
通讯作者:
Meschia,G
Meschia,G
中科院分区:
--
文献类型:
--
作者:
Timmerman,M;Teng,C;Wilkening,RB;Fennessey,P;Battaglia,FC;Meschia,G

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胎羔静脉输注地塞米松 (Dex) 会导致血浆谷氨酰胺和其他生糖氨基酸增加两到三倍,并使血浆谷氨酸减少至正常值的大约三分之一。为了探索潜在的机制,在26小时Dex输注之前和最后2小时内测量了六只绵羊胎儿的肝脏氨基酸摄取以及1-[1-13C]谷氨酰胺、甲苯-[1-13C]谷氨酸和13CO2的转化。 Dex 降低了肝脏谷氨酰胺和丙氨酸的摄取(P<0.01)以及肝脏谷氨酸的输出(P<0.001)。血浆谷氨酰胺形成的谷氨酸(RGlu、Gln)和 CO2 的肝输出量分别下降至对照的 21%(P<0.001)和 53%(P=0.009)。 RGlu、Gln(表示为两个输出的分数)从 0.36 ± 0.02 下降至 0.18 ± 0.04(P < 0.001)。在整个实验过程中,肝葡萄糖输出几乎保持为零。我们得出的结论是,Dex 通过增加谷氨酸碳进入柠檬酸循环的路径和减少肝脏对生糖氨基酸的摄取来减少胎儿肝脏谷氨酸输出。
Intravenous infusion of dexamethasone (Dex) in the fetal lamb causes a two- to threefold increase in plasma glutamine and other glucogenic amino acids and a decrease of plasma glutamate to approximately one-third of normal. To explore the underlying mechanisms, hepatic amino acid uptake and conversion ofl-[1-13C]glutamine tol-[1-13C]glutamate and13CO2were measured in six sheep fetuses before and in the last 2 h of a 26-h Dex infusion. Dex decreased hepatic glutamine and alanine uptakes (P< 0.01) and hepatic glutamate output (P< 0.001). Hepatic outputs of the glutamate (RGlu,Gln) and CO2formed from plasma glutamine decreased to 21 (P< 0.001) and 53% (P= 0.009) of control, respectively. RGlu,Gln, expressed as a fraction of both outputs, decreased (P< 0.001) from 0.36 ± 0.02 to 0.18 ± 0.04. Hepatic glucose output remained virtually zero throughout the experiment. We conclude that Dex decreases fetal hepatic glutamate output by increasing the routing of glutamate carbon into the citric acid cycle and by decreasing the hepatic uptake of glucogenic amino acids.
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