Effect of a chloride channel blocker on bullfrog corneal epithelium.

Effect of a chloride channel blocker on bullfrog corneal epithelium.
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氯离子通道阻滞剂对牛蛙角膜上皮的影响。

DOI:
10.1152/ajpcell.1988.254.4.c519
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发表时间:
1988
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Zadunaisky,JA
Zadunaisky,JA
中科院分区:
--
文献类型:
--
作者:
Scheide,JI;Zadunaisky,JA

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用微电极技术研究了氯离子通道阻断剂二苯胺-2-羧酸盐(DPC)对牛蛙角膜上皮细胞的作用。在泪液侧灌注2 × 10(-4)M DPC导致角膜跨上皮电位差(TEP)降低44%,角膜电导降低9%。角膜上皮细胞超极化7.2 +/- 1.5 mV,顶端部分电阻增加35%(n = 8个组织)。基底外侧电位差去极化5.5 +/- 1.8 mV。随着DPC暴露时间的延长,相对顶端电导降低29%,而基底外侧膜的相对变化增加56%,表明DPC抑制作用于顶端细胞膜。DPC处理的角膜可以用异丙肾上腺素(10(-6)M)刺激,表明DPC抑制可以用氯离子电导的刺激来逆转。DPC的抑制作用依赖于基底外侧氯。胞内氯离子活性随着DPC的增加而增加,表明基底外侧氯离子进入机制的完整性没有改变。DPC的抑制作用是由于减少顶端氯电导。
The effect of the chloride channel blocker, diphenylamine-2-carboxylate (DPC), was investigated on the bullfrog cornea epithelium using microelectrodes. Perfusion of 2 X 10(-4) M DPC on the tear side resulted in a 44% reduction of the corneal transepithelial potential difference (TEP) and a 9% reduction in corneal conductance. The cornea epithelial cells hyperpolarized 7.2 +/- 1.5 mV, and the apical fractional resistance increased 35% (n = 8 tissues). The basolateral potential difference depolarized 5.5 +/- 1.8 mV. The relative apical conductance decreased 29%, whereas relative changes of basolateral membranes increased 56% with prolonged DPC exposure, indicating that the DPC inhibition was acting at the apical cell membrane. DPC-treated corneas could be stimulated with isoproterenol (10(-6) M), indicating that the DPC inhibition could be reversed with the stimulation of chloride conductance. The DPC inhibitory effect was dependent on basolateral chloride. Intracellular chloride activity increases with DPC, indicating that the integrity of the basolateral chloride entry mechanism was not altered. The DPC inhibitory action was due to a reduction in apical chloride conductance.
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