Anion permeabilities of the isolated perfused rabbit proximal tubule.

Anion permeabilities of the isolated perfused rabbit proximal tubule.
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离体灌注兔近端小管的阴离子渗透率。

DOI:
10.1152/ajprenal.1982.242.4.f395
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发表时间:
1982
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Yee,VJ
Yee,VJ
中科院分区:
--
文献类型:
--
作者:
Warnock,DG;Yee,VJ

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采用电生理和同位素技术研究兔离体近端小管(S2段)的阴离子通透性。通过电生理学而不是解剖学标准,将小管区分为对氯和钠有选择性的群体。在抑制主动钠转运的条件下对这些小管进行了研究。氯离子选择管的氯离子渗透系数为5.5+/-0.6×10(-5)cm/S(n=19),钠选择管的渗透系数为3.2+/-0.6×10(-5)cm/S(n=15)。异硫酸盐的渗透系数为1.1+/-0.2×10(-5)cm/S(n=23),不受钠和氯选择性的影响。氧阴离子渗透性(碳酸氢盐、异硫酸盐和甜蜜素)相对于氯离子的变化是由氯离子渗透性本身的变化引起的,而不是氧阴离子渗透性的任何变化。碳酸氢盐和异硫酸盐渗透率之间的一致关系使碳酸氢根离子的渗透率估计为1.3×10(-5)cm/S。离子选择性的机制对于两种类型的小管似乎是不同的。氯离子选择的小管似乎有相对较小的路径,不包含固定电荷位置。相反,钠选择性小管可能有包含固定负电荷位的渗透路径。
Electrophysiologic and isotopic techniques were used to characterize the anion permeabilities of isolated perfused rabbit proximal tubules (S2 segments). Tubules were differentiated into chloride- and sodium-selective populations by electrophysiologic rather than by anatomic criteria. The tubules were studied under conditions that inhibited active sodium transport. The isotopic chloride permeability coefficient was 5.5 +/- 0.6 X 10(-5) cm/s (n = 19) for chloride-selective tubules and 3.2 +/- 0.6 X 10(-5) cm/s (n = 15) for sodium-selective tubules. The isethionate permeability coefficient was 1.1 +/- 0.2 X 10(-5) cm/s (n = 23) and did not vary with sodium or chloride selectivity. The variation of oxyanion permeability (bicarbonate, isethionate, and cyclamate) relative to chloride resulted from changes in chloride permeability, per se, rather than any change in the oxyanion permeability. A consistent relation between bicarbonate and isethionate permeability permitted the permeability of bicarbonate ion to be estimated at 1.3 X 10(-5) cm/s. The mechanism of ion selectivity appears to be different for the two populations of tubules. Chloride-selective tubules appear to hve relatively small pathways that do not contain fixed-charge sites. In contrast, sodium-selective tubules may have permeation pathways that contain fixed negative-charge sites.
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