Sites of action of glucagon and other Ca2+ mobilizing hormones on the malate aspartate cycle.
Sites of action of glucagon and other Ca2+ mobilizing hormones on the malate aspartate cycle.
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胰高血糖素和其他 Ca2 动员激素对苹果酸天冬氨酸循环的作用位点。
DOI:
10.1016/0003-9861(88)90599-1
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发表时间:
1988
影响因子:
3.9
通讯作者:
K. Lanoue
中科院分区:
文献类型:
--
作者:
T. Strzelecki;D. Strzelecka;C. Koch;K. Lanoue
Data from a number of laboratories suggest that the exchange of glutamate for aspartate across the mitochondrial inner membrane is stimulated by glucagon and by Ca2+-mobilizing hormones. The purpose of this study was to determine the site of action of these hormones. Two possibilities were considered and tested. The first hypothesis is that the mitochondrial membrane electrical potential gradient (ΔΨm) in the cells is increased by the hormones; and that the putative increase in ΔΨmstimulates aspartate efflux. The second possibility is that Ca2+mediates decreases in cellular levels of α-ketoglutarate, secondary to stimulation of α-ketoglutarate dehydrogenase, and that the decrease in α-ketoglutarate stimulates aspartate production by mitochondria. The effect of glucagon on ΔΨmwas estimated in intact hepatocytes using the lipophilic cation tetraphenyl phosphonium. No increase in ΔΨmwas observed due to hormone treatment. On the other hand, α-ketoglutarate was found to be an effective competitive inhibitor of aspartate formation via glutamate transamination by isolated liver mitochondria (Ki= 0.55mM).
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DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Joseph,SK;Thomas,AP;Williams,RJ;Irvine,RF;Williamson,JR
通讯作者:
Williamson,JR
DOI:
--
发表时间:
1985
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sistare,FD;Picking,RA;HaynesJr,RC
通讯作者:
HaynesJr,RC
影响因子:
3.9
作者:
Yip,BP;Lardy,HA
通讯作者:
Lardy,HA
DOI:
--
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
LaNoue,KF;Koch,CD;Meditz,RB
通讯作者:
Meditz,RB