Release of iron from diferric transferrin in the presence of rat liver plasma membranes: no evidence of a plasma membrane diferric transferrin reductase.

Release of iron from diferric transferrin in the presence of rat liver plasma membranes: no evidence of a plasma membrane diferric transferrin reductase.
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在大鼠肝质膜存在的情况下从二铁转铁蛋白释放铁:没有质膜二铁转铁蛋白还原酶的证据。

DOI:
10.1016/0167-4889(90)90053-g
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发表时间:
1990
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Aisen,P
Aisen,P
中科院分区:
--
文献类型:
--
作者:
Thorstensen,K;Aisen,P

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用分光光度法和EPR光谱法测定了不同条件下铁从异铁转铁蛋白向邻菲罗啉二磺酸盐的转移。完整的大鼠肝细胞有效地介导铁从人异铁转铁蛋白到二磺酸盐的转移。相比之下,在pH 7.4存在NADH时,分离的大鼠肝质膜不能促进反应,尽管膜能够还原铁氰化物并氧化NADH。不同转铁蛋白刺激NADH氧化。然而,铁氰化物还原酶和转铁蛋白刺激的NADH氧化酶活性显然与铁从转铁蛋白中释放无关。我们的结果,结合理论上的考虑,表明完整的细胞或分离的质膜有能力(或没有能力)促进铁从转铁蛋白转移到强异位铁螯合剂,不允许干扰铁还原步骤的存在,作为细胞从转铁蛋白吸收铁的过程的一部分。
The transfer of iron from diferric transferrin to bathophenanthroline disulfonate was measured under varying conditions by spectrophotometry and EPR spectroscopy. Intact rat hepatocytes efficiently mediated the transfer of iron from human diferric transferrin to bathophenanthroline disulfonate. Isolated rat liver plasma membranes, in contrast, failed to facilitate the reaction at pH 7.4 in the presence of NADH, although the membranes were able to reduce ferricyanide and to oxidize NADH. Oxidation of NADH was stimulated by diferric transferrin. However, ferricyanide reductase and transferrin-stimulated NADH oxidase activities were apparently not linked to release of iron from transferrin. Our results, together with theoretical considerations, show that the ability (or inability) of intact cells or isolated plasma membranes to facilitate the transfer of iron from transferrin to strong diferric iron chelators does not allow interferences about the existence of an iron reduction step as part of the process of cellular uptake of iron from transferrin.
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DOI: --
发表时间: 1980
期刊:
影响因子: --
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