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美西螈肾脏近端小管中的双离子电位。

Biionic potentials in the proximal tubule of Necturus kidney.

作者信息

Anagnostopoulos T

出版信息

J Physiol. 1973 Sep;233(2):375-94. doi: 10.1113/jphysiol.1973.sp010313.

Abstract
  1. Biionic potentials were studied in the proximal tubule of the doubly perfused Necturus kidney and subsequently analysed by means of an equivalent electrical circuit.2. Luminal membrane resistance was found to be at least 3 times greater than peritubular membrane resistance.3. Potassium contribution to peritubular membrane conductance amounts to at least 75%. Replacement of chloride in peritubular circulation by benzene sulphonate or acetyl glycinate hyperpolarized peritubular membrane.4. The peritubular membrane is more permeable to choline than to sodium. Indirect evidence suggests that the opposite may apply at the luminal border.5. The shunt pathway discriminates poorly, if at all, between sodium, potassium and choline, in short term experiments.6. Chloride permeability across the shunt pathway is about three times as great as combined cationic permeabilities.
摘要
  1. 研究了双灌注美西螈肾脏近端小管中的生物离子电位,随后通过等效电路进行分析。

  2. 发现管腔膜电阻至少比肾小管周围膜电阻大3倍。

  3. 钾对肾小管周围膜电导的贡献至少达75%。用苯磺酸盐或乙酰甘氨酸替代肾小管周围循环中的氯会使肾小管周围膜超极化。

  4. 肾小管周围膜对胆碱的通透性比对钠的通透性更高。间接证据表明,在管腔边界可能情况相反。

  5. 在短期实验中,分流途径对钠、钾和胆碱的区分能力很差,甚至根本无法区分。

  6. 氯通过分流途径的通透性约为阳离子总通透性的三倍。

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Chloride transport in the renal proximal tubule.肾近端小管中的氯离子转运。
Pflugers Arch. 2004 Sep;448(6):561-70. doi: 10.1007/s00424-004-1309-y. Epub 2004 Jul 16.

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