Measurement of the cytosolic sodium ion concentration in rat brain synaptosomes by a fluorescence method.

Measurement of the cytosolic sodium ion concentration in rat brain synaptosomes by a fluorescence method.
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荧光法测定大鼠脑突触体中胞质钠离子浓度。

DOI:
10.1016/0005-2736(88)90198-8
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发表时间:
1988
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Nachshen,DA
Nachshen,DA
中科院分区:
--
文献类型:
--
作者:
Kongsamut,S;Nachshen,DA

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描述了一种测量完整突触体胞浆Na+浓度的方法。该方法利用了可以加载到胞质溶胶中的pH敏感染料(BCECF)和可以跨突触体膜将Na+交换为H+的相对特异性离子载体(莫能菌素)。通过设置条件使得H+跨膜没有电化学电势差(没有膜电势并且pH i= pH o),只有当Na+存在浓度差时,离子载体的添加才会诱导H+通量。因此,当没有荧光变化(没有胞质pH变化)时,细胞外[Na+]等于突触体内[Na+]。突触体内[Na+]浓度测定为7±3 mM(n= 5;平均值±SE)。用这种荧光方法获得的结果进行了比较,通过原子吸收光谱法获得的估计。该方法的局限性和应用进行了讨论。
A method for the measurement of the cytosolic Na+ concentration in intact synaptosomes is described. This method makes use of a pH sensitive dye (BCECF) that can be loaded into the cytosol and a relatively specific ionophore (monensin) that can exchange Na+ for H+ across the synaptosomal membrane. By setting conditions such that there is no electrochemical potential difference for H+ across the membrane (no membrane potential and pH i= pH o), addition of ionophore would induce a H+ flux only if there is a concentration difference for Na+. Thus, when there is no fluorescence change (no cytosolic pH change) extracellular [Na+] equals intrasynaptosomal [Na+. The intrasynaptosomal [Na+] concentration was determined to be 7±3 mM (n= 5; mean±SE). The results obtained with this fluorescence method are compared with estimates obtained by atomic absorption spectrometry. Limitations and applications of the method are discussed.
细胞间基质的化学和分子生物学
DOI: --
发表时间: 1970
期刊:
影响因子: --
作者:
E. Balazs
通讯作者: E. Balazs
DOI: --
发表时间: 1973
期刊:
影响因子: --
作者:
U. Bachrach
通讯作者: U. Bachrach