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细胞外钠离子对红细胞钠泵的影响。

The influence of external sodium ions on the sodium pump in erythrocytes.

作者信息

Priestland R N, Whittam R

出版信息

Biochem J. 1968 Sep;109(3):369-74. doi: 10.1042/bj1090369.

Abstract
  1. A study has been made of the interaction between Na(+) and K(+) on the adenosine triphosphatase activity of erythrocyte ;ghosts', and on the K(+) influx and Na(+) efflux of intact erythrocytes. The adenosine triphosphatase activity and the ion movements were greater at a low external K(+) concentration in the absence of Na(+) than they were in the presence of 150mm-Na(+). The inhibition by external Na(+) of K(+) influx had an inhibitory constant of 5-10mm. 2. Activation by K(+) of kidney microsomal adenosine triphosphatase was retarded by Na(+), and activation by Na(+) was retarded by K(+). Fragmented erythrocyte membranes behaved similarly. 3. These observations suggest that there is competition between Na(+) and K(+) at the K(+)-sensitive site of the membrane.
摘要
  1. 已经对钠(Na⁺)和钾(K⁺)之间的相互作用进行了研究,该相互作用涉及红细胞“血影”的三磷酸腺苷酶活性,以及完整红细胞的钾离子内流和钠离子外流。在不存在钠离子的情况下,低细胞外钾离子浓度时的三磷酸腺苷酶活性和离子运动比在存在150mmol/L钠离子时更高。细胞外钠离子对钾离子内流的抑制作用,其抑制常数为5 - 10mmol/L。2. 钾离子对肾微粒体三磷酸腺苷酶的激活作用受到钠离子的抑制,而钠离子的激活作用受到钾离子的抑制。破碎的红细胞膜表现出类似情况。3. 这些观察结果表明,在膜的钾离子敏感位点上,钠离子和钾离子之间存在竞争。

相似文献

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The stoicheiometry of the sodium pump.钠泵的化学计量学。
J Physiol. 1967 Sep;192(1):217-35. doi: 10.1113/jphysiol.1967.sp008297.

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Sodium and potassium movements in human red cells.人体红细胞中钠和钾的运动
J Physiol. 1956 Nov 28;134(2):278-310. doi: 10.1113/jphysiol.1956.sp005643.
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The sensitivity of the sodium pump to external sodium.钠泵对细胞外钠离子的敏感性。
J Physiol. 1967 Sep;192(1):175-88. doi: 10.1113/jphysiol.1967.sp008295.

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