Organization of hepatic nitrogen metabolism and its relation to acid-base homeostasis

Organization of hepatic nitrogen metabolism and its relation to acid-base homeostasis
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肝脏氮代谢的组织及其与酸碱稳态的关系

DOI:
10.1007/bf01798059
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发表时间:
1990
期刊:
Klinische Wochenschrift
影响因子:
--
通讯作者:
D. Häussinger
D. Häussinger
中科院分区:
--
文献类型:
--
作者:
D. Häussinger

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肝和肾的氮代谢通过器官间谷氨酰胺通量联系在一起,将肾氨生成和肝尿素生成耦合到全身酸碱调节。这是因为蛋白质分解产生等摩尔量的NH4+和HCO3−。肝脏在这一器官间团队努力中的作用是基于尿素合成的组织特异性存在,这代表了代谢产生的碳酸氢盐的主要不可逆清除途径。通过细胞外酸碱状态经由尿素生成对碳酸氢盐处置的敏感且复杂的控制在酸碱状态和碳酸氢盐消除速率之间产生反馈控制回路。这种碳酸氢盐体内平衡机制的运作没有高氨血症的威胁,因为在肝腺泡中氨代谢途径的复杂结构和功能组织将尿素合成与消除潜在有毒氨的重要需求分开。
SummaryHepatic and renal nitrogen metabolism are linked by an interorgan glutamine flux, coupling both renal ammoniagenesis and hepatic ureogenesis to systemic acid base regulation. This is because protein breakdown produces equimolar amounts of NH4+ and HCO3−. A hepatic role in this interorgan team effort is based upon the tissuespecific presence of urea synthesis, which represents a major irreversible pathway for removal of metabolically generated bicarbonate. A sensitive and complex control of bicarbonate disposal via ureogenesis by the extracellular acid-base status creates a feed-back control loop between the acidbase status and the rate of bicarbonate elimination. This bicarbonate-homeostatic mechanism operates without threat of hyperammonemia, because a sophisticated structural and functional organisation of ammonia-metabolizing pathways in the liver acinus uncouples urea synthesis from the vital need to eliminate potentially toxic ammonia.
静脉周围和门脉周围大鼠肝细胞中肝谷氨酰胺酶活性和 mRNA 的分布。
DOI: 10.1042/bj2670265
发表时间: 1990
期刊: The Biochemical journal
影响因子: --
作者:
Watford,M;Smith,EM
通讯作者: Smith,EM
[13N]氨在大鼠体内肝脏中的短期代谢命运。
DOI: --
发表时间: 1987
期刊: The Journal of biological chemistry
影响因子: --
作者:
Cooper,AJ;Nieves,E;Coleman,AE;Filc-DeRicco,S;Gelbard,AS
通讯作者: Gelbard,AS