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.
复制标题
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
复制
发表时间:
1988
期刊:
影响因子:
--
通讯作者:
Nachshen,DA
中科院分区:
文献类型:
--
作者:
Kongsamut,S;Nachshen,DA
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.
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