In vivo kinetics of a covalent growth hormone-binding protein complex.

In vivo kinetics of a covalent growth hormone-binding protein complex.
复制标题

共价生长激素结合蛋白复合物的体内动力学。

DOI:
10.1016/0026-0495(89)90119-4
复制
发表时间:
1989
期刊:
Metabolism: clinical and experimental
影响因子:
--
通讯作者:
Buchanan,TA
Buchanan,TA
中科院分区:
--
文献类型:
--
作者:
Baumann,G;Shaw,MA;Buchanan,TA

文献摘要

参考文献

被引文献

相似文献

新发现的人血浆中人生长激素(hGH)结合蛋白(BP)的生物学功能在很大程度上尚不清楚; hGH 部分以与 BP 相关的复合形式循环。在之前的一项研究中,我们表明,在 BP 存在的情况下,hGH 的体内动力学发生了改变。然而,该研究仅提供了定性信息,因为 BP 过量存在并且复合物在体内容易解离。为了获得有关复合 hGH 体内行为的更多定量信息,测量了共价交联、化学计量正确、化学稳定的 hGH-BP 复合物的代谢清除率 (MCR)、分布体积 (Vd) 和降解率。复合hGH的MCR和降解率比游离hGH低十倍(P<.001),并且其Vd显着小于游离hGH(P<.001)。该共价复合物与多克隆抗 hGH 抗体完全发生免疫反应。我们得出的结论是,通过限制进入降解位点(包括近端肾小管和受体介导的细胞内蛋白水解细胞器的递送),可以保护复合的 hGH 免遭清除和降解。所开发的数据还提供了有关 BP 本身体内分布的初步信息。这些数据为未来关于 BP 体内效应的研究提供了重要的指导。此外,结果表明 hGH 的主要表位仍然暴露在复合物的外表面上。
The biologic function of the newly recognized binding proteins (BP) for human growth hormone (hGH) in human plasma is largely unknown; hGH circulates in part in complexed form in association with the BP. In a previous study we showed that the in vivo kinetics of hGH were altered in the presence of the BP. However, that study gave only qualitative information because the BP was present in excess and the complex was subject to dissociation in vivo. To gain more quantitative information about the in vivo behavior of complexed hGH, metabolic clearance (MCR), distribution volume (Vd), and degradation rate of a covalently crosslinked, stoichiometrically correct, chemically stable hGH-BP complex were measured. The MCR and the degradation rate of complexed hGH were tenfold lower than those of free hGH (P< .001), and its Vdwas significantly smaller than that for free hGH (P< .001). The covalent complex was fully immunoreactive with polyclonal anti-hGH antibodies. We conclude that complexed hGH is protected from clearance and degradation by being restricted from access to degradation sites, including the proximal renal tubule and receptor-mediated delivery to intracellular proteolygic organelles. The data developed also yield preliminary information about the in vivo distribution of the BP itself. These data provide important guidelines for future studies regarding the in vivo effects of the BP. In addition, the results indicate that the principal epitope(s) of hGH remain(s) exposed on the outer surface of the complex.
人类碳酸酐酶 B 功能的探索。
DOI: --
发表时间: 1978
期刊: Biochimica et Biophysica Acta
影响因子: --
作者:
S. K. Chapman;T. Maren
通讯作者: T. Maren
牛碳酸酐酶与乙酸根离子的相互作用。
DOI: --
发表时间: 1974
期刊: Biochimica et Biophysica Acta
影响因子: --
作者:
A. Lanir;G. Navon
通讯作者: G. Navon
DOI: 10.1073/pnas.72.2.454
发表时间: 1975
影响因子: 11.1
作者:
P. Yeagle;C. Lochmuller;Robert W. Henkens
通讯作者: Robert W. Henkens
碳酸酐酶:更新和新视野。
DOI: --
发表时间: 1985
影响因子: 3.9
作者:
N. D. Carter;Stephen Jeffery
通讯作者: Stephen Jeffery
碳酸酐酶抑制剂复合物中的芳环动力学
DOI: --
发表时间: 1987
期刊:
影响因子: --
作者:
J. T. Gerig;J. Moses
通讯作者: J. Moses