Activation of potassium ion transport in mitochondria by cadmium ion.

Activation of potassium ion transport in mitochondria by cadmium ion.
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镉离子激活线粒体中钾离子的转运。

DOI:
10.1111/j.1432-1033.1984.tb08513.x
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发表时间:
1984
期刊:
European journal of biochemistry
影响因子:
--
通讯作者:
Sanadi,DR
Sanadi,DR
中科院分区:
--
文献类型:
--
作者:
Rasheed,BK;Diwan,JJ;Sanadi,DR

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低水平的Cd 2+(1-5 μM)会导致线粒体迅速肿胀,这是呼吸依赖性和解偶联剂敏感性的。没有明显的阳离子需求,因为肿胀发生在仅含有蔗糖和呼吸基质的介质中。肿胀被钌红抑制,表明Cd 2+的这种作用需要其进入线粒体。在含有9 mM K+的培养基中,加入Cd 2+沿着钌红使K+内流速率增加3倍。在存在K+、Rb+或Li+但不存在Na+的情况下,加入Cd 2+首先产生H+流出到介质中,然后排出pH梯度或解偶联。只有后者的效果被钌红抑制,表明流出和流入的H+是独立的反应。H+流出似乎是对诱导的K+进入的逆向反应。它被Cd 2+激活的作用类似于对氯汞苯磺酸盐的已知作用。H+内流或解偶联似乎是由于Cd 2+与某些面向基质的膜位点(可能是偶联因子B上的二巯基)结合所致,并可能与Cd 2+诱导肿胀相关的表观渗透性变化有关。
Low levels of Cd2+(1–5 μM) produce rapid swelling of mitochondria, which is respiration‐dependent and uncoupler‐sensitive. No cation requirement is apparent, since the swelling occurs in a medium containing only sucrose and the respiratory substrate. The swelling is inhibited by ruthenium red, suggesting that this effect of Cd2+requires its entry into mitochondria. In medium containing 9 mM K+, addition of Cd2+along with ruthenium red increases the rate of K+influx threefold. In the presence of K+, Rb+or Li+, but not of Na+, addition of Cd2+produces first efflux of H+into the medium followed by discharge of the pH gradient or uncoupling. Only the latter effect is inhibited by ruthenium red, showing that the efflux and influx of H+are independent reactions. The H+efflux appears to be an antiport response to the induced K+entry. Its activation by Cd2+is similar to the known effect ofp‐chloromercuriphenyl sulfonate. The H+influx or uncoupling appears to result from binding of Cd2+to some matrix‐facing membrane site, perhaps the dithiol group on coupling factor B, and may relate to apparent permeability changes associated with Cd2+‐induced swelling.
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