Vascular oxidative metabolism under different metabolic conditions.

Vascular oxidative metabolism under different metabolic conditions.
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不同代谢条件下的血管氧化代谢。

DOI:
10.1016/0167-4889(92)90060-o
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发表时间:
1992
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Kushmerick,MJ
Kushmerick,MJ
中科院分区:
--
文献类型:
--
作者:
Hardin,CD;Wiseman,RW;Kushmerick,MJ

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在血管平滑肌中的呼吸控制被检查,同时操纵组织的代谢状态。在5 mM葡萄糖存在下KCl诱导的挛缩期间,氧消耗增加10 nmol/每分钟g,而磷酸肌酸(PCr)或ATP没有任何减少,如通过31 P-NMR测定的,这表明呼吸的控制不涉及高能磷酸盐(例如,ADP,磷酸化潜能)。然而,当在没有底物的情况下提供具有静息张力的葡萄糖时,然后提供5 mM 2-脱氧葡萄糖作为唯一底物,氧消耗增加7.4 nmol/min/g,而PCr降低超过50%(导致计算的游离ADP增加2倍),张力从静息张力没有变化。在随后的氯化钾诱导挛缩的存在下,2-脱氧葡萄糖,耗氧量增加了额外的7.2 nmol/min每克,而PCr继续下降。因此,绵羊主动脉中可能存在至少两种呼吸控制机制,一种依赖于高能磷酸盐的变化,另一种独立于高能磷酸盐的变化。
Control of respiration in vascular smooth muscle was examined while the metabolic state of the tissue was manipulated. During KCl-induced contractures in the presence of 5 mM glucose, oxygen consumption increased by 10 nmol/per min g without any decrease in phosphocreatine (PCr) or ATP as determined by31P-NMR indicating a control of respiration which does not involve changes in high-energy phosphates (e.g., ADP, phosphorylation potential). However, when aortae with resting tone in the absence of substrate were then provided with 5 mM 2-deoxyglucose as the sole substrate, oxygen consumption increased 7.4 nmol/min per g while PCr decreased by more than 50% (resulting in a 2-fold increase in the calculated free ADP) with no change in tension from resting tone. During a subsequent KCl induced contracture in the presence of 2-deoxyglucose, oxygen consumption increased an additional 7.2 nmol/min per g while PCr continued to decline. Therefore, at least two mechanisms of respiratory control may exist in sheep aorta, one dependent and the other independent of changes in high-energy phosphates.
完整心肌中氧化磷酸化的动力学和调节的 31P NMR 研究
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发表时间: 1987
影响因子: 5.2
作者:
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