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
K. Lanoue
中科院分区:
生物学3区
文献类型:
--
作者:
T. Strzelecki;D. Strzelecka;C. Koch;K. Lanoue

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来自许多实验室的数据表明,谷氨酸与天冬氨酸在线粒体内膜上的交换是由胰高血糖素和Ca2+动员激素刺激的。这项研究的目的是确定这些激素的作用部位。考虑并测试了两种可能性。第一种假设是细胞内线粒体膜电位梯度(ΔΨm)因激素的作用而增加;以及ΔΨmstimulates天冬氨酸外排的假定增加。第二种可能是Ca2+介导细胞α-酮戊二酸水平的降低,继发于α-酮戊二酸脱氢酶的刺激,α-酮戊二酸水平的降低刺激线粒体产生天冬氨酸。胰高血糖素对ΔΨmwas的影响估计在完整的肝细胞使用亲脂阳离子四苯基磷。由于激素治疗,ΔΨmwas未见增加。另一方面,α-酮戊二酸被发现是一种有效的竞争性抑制剂,通过离体肝脏线粒体谷氨酸转氨化形成天冬氨酸(Ki= 0.55mM)。
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).
DOI: --
发表时间: 1984
期刊: The Journal of biological chemistry
影响因子: --
作者:
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DOI: 10.1016/0003-9861(81)90377-5
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DOI: --
发表时间: 1982
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Meditz,RB