Olfactory neurons exhibit heterogeneity in depolarization-induced calcium changes.

Olfactory neurons exhibit heterogeneity in depolarization-induced calcium changes.
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嗅觉神经元在去极化诱导的钙变化中表现出异质性。

DOI:
10.1152/ajpcell.1990.258.6.c1051
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发表时间:
1990
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
Teeter,JH
Teeter,JH
中科院分区:
--
文献类型:
--
作者:
Restrepo,D;Teeter,JH

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通过木瓜蛋白酶短暂(15 分钟)处理,分离斑点叉尾鮰的嗅觉神经元。与 fura-2 乙酰氧基甲酯 (fura-2/AM) 孵育 1 小时后,发现分离的嗅觉受体细胞将 fura-2/AM 水解为 fura-2 游离酸,而没有检测到痕量的水解中间产物。使用 fura-2 在单细胞中测量的细胞内钙覆盖范围很广(从小于 2 到 100 nM,中位数为 17.6 nM,n = 140 个细胞)。百分之二十一的细胞对钾诱导的去极化做出反应,通过细胞外钙流入介导的细胞内钙增加。 L 型钙通道拮抗剂尼莫地平抑制由膜去极化引发的细胞内钙的增加,并阻断显示 L 型钙电流特征的小单一钡电流(在 55 mM BaCl2 中单一电导为 29 +/- 5 pS,Ba2+ 相对于 Na+ 和 K+ 具有高选择性),这些电流是从贴片吸管尖端的唑克汀双层记录的,其中分离了嗅纤毛膜囊泡已被纳入。人们发现嗅觉神经元对膜去极化的反应在功能上存在异质性,可以分为三组:一组细胞内钙的增加是快速且短暂的,另一组细胞中钙增加缓慢,第三组细胞中去极化不会引起细胞内钙的变化。
Olfactory neurons from the channel catfish, Ictalurus punctatus, were isolated by a brief (15 min) treatment with papain. After incubation with fura-2 acetoxymethyl ester (fura-2/AM) for 1 h, the isolated olfactory receptor cells are found to hydrolyze fura-2/AM to fura-2 free acid without detectable traces of intermediate products of hydrolysis. Intracellular calcium measured with fura-2 in single cells covers a wide range (from less than 2 to 100 nM with a median of 17.6 nM, n = 140 cells). Twenty-one percent of the cells respond to potassium-induced depolarization with an increase in intracellular calcium mediated by influx of extracellular calcium. The L-type calcium channel antagonist nimodipine inhibits the increase in intracellular calcium triggered by membrane depolarization and blocks small unitary barium currents displaying the characteristics of L-type calcium currents (unitary conductance of 29 +/- 5 pS in 55 mM BaCl2 and high selectivity for Ba2+ over Na+ and K+) recorded from azolectin bilayers at the tip of patch pipettes into which isolated olfactory cilia membrane vesicles had been incorporated. Olfactory neurons are found to be functionally heterogeneous in their response to membrane depolarization and can be separated into three groups: one in which the increase in intracellular calcium is rapid and transient, another in which calcium increases slowly, and a third group of cells in which depolarization causes no change in intracellular calcium.
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