Anionic mechanisms of zinc uptake across the human red cell membrane.

Anionic mechanisms of zinc uptake across the human red cell membrane.
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穿过人类红细胞膜的锌摄取的阴离子机制。

DOI:
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发表时间:
1990
期刊:
Journal of Physiology
影响因子:
--
通讯作者:
T. Simons
T. Simons
中科院分区:
--
文献类型:
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作者:
V. Kalfakakou;T. Simons

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1.锌通过两种机制被人体红细胞吸收,这取决于阴离子的存在。其中之一需要碳酸氢根离子,被4,4 '-二异硫氰酸基芪-2,2'-二磺酸(DIDS)抑制,并似乎被阴离子交换剂催化。第二个发生在硫氰酸根或水杨酸根离子的存在下,并可能代表与Zn 2+的中性络合物的运输。2.在pH 7.4和37 ℃(+/-S.D.)下,存在5 mM-碳酸氢盐时,通过阴离子交换剂摄取Zn 2+的初始速率为64 +/-13 mumol(10(13)个细胞x h)-1 microM-1外部Zn 2+。这约为阴离子交换剂吸收Pb 2+的相应速率的1/250。3.迁移随Zn 2+浓度、HCO 3-浓度和pH的变化表明,迁移的物种可能是ZnCO 3Cl-或Zn(HCO 3)Cl·OH-。4.通过上述两种途径均未观察到锌外排。这一观察结果表明,细胞内游离Zn 2+浓度低于3 nM。
1. Zinc is taken up into human red cells by two mechanisms that depend upon the presence of anions. One of these requires bicarbonate ions, is inhibited by 4,4'‐diisothiocyanatostilbene‐2,2'‐disulphonic acid (DIDS) and appears to be catalysed by the anion exchanger. The second occurs in the presence of thiocyanate or salicylate ions and may represent transport of a neutral complex with Zn2+. 2. The initial rate of Zn2+ uptake via the anion exchanger is 64 +/‐ 13 mumol (10(13) cells x h)‐1 microM‐1 external Zn2+, in the presence of 5 mM‐bicarbonate at pH 7.4 and 37 degrees C (+/‐ S.D.). This is about 1/250 of the corresponding rate of Pb2+ uptake by the anion exchanger. 3. The variation of transport with Zn2+ concentration, HCO3‐ concentration and pH suggests that the transported species may be ZnCO3Cl‐ or Zn(HCO3)Cl.OH‐. 4. Zinc efflux could not be observed by either of the above routes. This observation suggests that the intracellular free Zn2+ concentration is below 3 nM.
离体大鼠肝细胞对锌的吸收。
DOI: 10.1016/0005-2736(81)90099-7
发表时间: 1981
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Stacey,NH;Klaassen,CD
通讯作者: Klaassen,CD
肝细胞对锌的吸收和代谢。
DOI: --
发表时间: 1986
期刊: Federation proceedings
影响因子: --
作者:
Pattison,SE;Cousins,RJ
通讯作者: Cousins,RJ
通过核磁共振波谱研究可滴定阴离子的红细胞膜转运的 pH 依赖性。
DOI: --
发表时间: 1988
期刊: The Journal of biological chemistry
影响因子: --
作者:
Labotka,RJ;Omachi,A
通讯作者: Omachi,A