Intracellular pH regulation in the embryonic chicken lens epithelium.

Intracellular pH regulation in the embryonic chicken lens epithelium.
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胚胎鸡晶状体上皮细胞内 pH 调节。

DOI:
10.1113/jphysiol.1990.sp018339
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发表时间:
1990
期刊:
The Journal of physiology
影响因子:
--
通讯作者:
Bassnett,S
Bassnett,S
中科院分区:
--
文献类型:
--
作者:
Bassnett,S

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1. 使用荧光 pH 探针羧基-seminaphthorhodaflor-1 (Snarf-1) 通过发射比技术测量胚胎晶状体上皮的细胞内 pH (pHi)。 2. 在含有 HCO3- 的人工房水 (AAH) 中,pHi 为 7.45,该值比沐浴介质 (pH = 7.3) 的碱性更强。在不含 HCO3 的 AAH 中,pHi 为 7.29。 3.乙酰唑胺是一种碳酸酐酶抑制剂,对静息pHi没有影响。 4. pHi 可以通过改变 HEPES 缓冲 AAH 的外部 pH (pHo)、添加或去除 CO2-HCO3-、或通过灌注弱碱 NH4Cl 和普鲁卡因来进行实验操作。 5. 撤除 5 mM 普鲁卡因引起的 pHi 变化用于计算内在细胞质缓冲能力 (beta i) 的值为 16.5 mM。 6. 添加阿米洛利 (1 mM) 或用低 Na+ AAH 溶液处理导致暴露 10 分钟后 pHi 下降 0.23。此外,这些治疗抑制了 NH4(+) 引起的酸中毒的 pHi 恢复。这些观察结果与阿米洛利敏感的 N(+)-H+ 反向转运的存在一致。 7. 添加 50 microM-莫能菌素形式的外源反向转运活性导致 pHi 增加 0.24。 8. 在含 HCO3(-) 的培养基中,用葡萄糖酸盐或异硫磺酸盐替代 Cl- 会导致 pHi 立即、可逆升高,而这种升高可被 2 mM-4-乙酰氨基-4'-异硫氰酸基-芪-2,2'-二磺酸 (SITS) 完全抑制。这表明该组织中存在 Cl(-)-HCO3-交换。 9. 在不含 HCO3(-) 的条件下,用葡萄糖酸盐或异硫酸盐替代 Cl- 会导致轻微的短暂酸化,5 分钟后,会发生大规模的持续碱化。 pHi 的延迟增加可以被 1 mM-阿米洛利 完全阻断,并且可能反映了 Na(+)-H+ 反向转运蛋白的体积敏感刺激,因为细胞体积(通过细胞高度测量估计)在此期间显着减少。
1. The intracellular pH (pHi) of embryonic lens epithelia was measured by the emission ratio technique using the fluorescent pH probe carboxy‐seminaphthorhodafluor‐1 (Snarf‐1). 2. In artificial aqueous humour solutions (AAH) containing HCO3‐, pHi was 7.45, a value more alkaline than that of the bathing medium (pH = 7.3). In HCO3‐ ‐free AAH, pHi was 7.29. 3. Acetazolamide, an inhibitor of carbonic anhydrase, had no effect on resting pHi. 4. The pHi could be manipulated experimentally by changing the external pH (pHo) of HEPES‐buffered AAH, the addition or withdrawal of CO2‐HCO3‐, or by perfusion with the weak bases NH4Cl and procaine. 5. The pHi change induced by withdrawal of 5 mM‐procaine was used to calculate a value for the intrinsic cytoplasmic buffering capacity (beta i) of 16.5 mM. 6. The addition of amiloride (1 mM) or treatment with low‐Na+ AAH solutions led to a decrease in pHi of 0.23 over the 10 min exposure. In addition, these treatments inhibited pHi recovery from NH4(+)‐induced acidosis. These observations are consistent with the presence of amiloride‐sensitive N(+)‐H+ antiport. 7. Addition of exogenous antiport activity in the form of 50 microM‐monensin caused an increase in pHi of 0.24. 8. In HCO3(‐)‐containing media, replacing Cl‐ by gluconate or isothionate led to an immediate, reversible increase in pHi which could be completely inhibited by 2 mM‐4‐acetamido‐4'‐isothiocyanato‐stillbene‐2,2'‐disulphonic acid (SITS). This indicates the presence of Cl(‐)‐HCO3‐ exchange in this tissue. 9. Under HCO3(‐)‐free conditions, replacement of Cl‐ by gluconate or isothionate caused a small transient acidification followed, 5 min later, by a large sustained alkalinization. The delayed increase in pHi could be completely blocked by 1 mM‐amiloride and may reflect volume‐sensitive stimulation of the Na(+)‐H+ antiporter as cell volume (estimated by cell height measurements) was shown to decrease significantly during this period.
DOI: 10.1083/jcb.86.2.576
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影响因子: --
作者:
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