Chloride transport and intracellular chloride activity in the presence of theophylline in Amphiuma small intestine.

Chloride transport and intracellular chloride activity in the presence of theophylline in Amphiuma small intestine.
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Amphiuma 小肠中茶碱存在下的氯离子转运和细胞内氯离子活性。

DOI:
10.1113/jphysiol.1981.sp013987
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发表时间:
1981
期刊:
The Journal of physiology
影响因子:
--
通讯作者:
White,JF
White,JF
中科院分区:
--
文献类型:
--
作者:
White,JF

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1.在短路条件下,在含有Cl-和HCO 3-的培养基中孵育的Amphiuma十二指肠的分离剥离段中,同时测量了22 Na和36 Cl的双向示踪剂通量。2.茶碱(10 mM)增加了短路电流(Isc),消除了净Cl-吸收,并将残余通量提高了50%以上。3.随后加入乙酰唑胺降低了Isc并减少了残余通量。4.使用双管Cl-特异性微电极,在存在茶碱的情况下,Cl-的细胞内活性平均为27.1 mM,与Cl-的活性蓄积一致。5.茶碱使绒毛上皮细胞粘膜平均去极化6.9mV。6.研究结果表明,茶碱对Cl-吸收的抑制作用并不是完全抑制粘膜Cl-吸收的结果,并提供了茶碱增强HCO 3-分泌的证据。
1. Simultaneous bidirectional tracer fluxes of 22Na and 36Cl were measured under short‐circuited conditions in isolated stripped segments of Amphiuma duodenum incubated in media containing Cl‐ and HCO3‐. 2. Theophylline (10 mM) increased the short‐circuit current (Isc), eliminated net Cl‐ absorption and elevated the residual flux by more than 50%. 3. Subsequent addition to acetazolamide lowered the Isc and reduced the residual flux. 4. Using double‐barreled Cl‐ specific micro‐electrodes the intracellular activity of Cl‐ averaged 27.1 mM in the presence of theophylline, consistent with active accumulation of Cl‐. 5. Theophylline depolarized the mucosal membrane of villus epithelial cells by an average of 6.9 mV. 6. The findings indicate that the inhibition of Cl‐ absorption by theophylline does not result from complete inhibition of mucosal Cl‐ uptake and provide evidence that HCO3‐ secretion is enhanced by theophylline.
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