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:
影响因子:
--
通讯作者:
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
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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DOI:
--
发表时间:
1989
期刊:
Journal of Reproduction and Fertility
影响因子:
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作者:
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1985
期刊:
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影响因子:
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通讯作者:
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DOI:
10.1152/ajpendo.1995.268.4.e705
发表时间:
1995
期刊:
The American journal of physiology.
影响因子:
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作者:
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通讯作者:
Meschia,G