The contribution of a Ca(2+)-activated Cl(-) conductance to amino-acid-induced inward current responses of ciliated olfactory neurons of the rainbow trout.

The contribution of a Ca(2+)-activated Cl(-) conductance to amino-acid-induced inward current responses of ciliated olfactory neurons of the rainbow trout.
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Ca(2)激活的Cl(-)电导对氨基酸诱导的虹鳟纤毛嗅神经元内向电流反应的贡献。

DOI:
10.1242/jeb.203.2.253
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发表时间:
2000
期刊:
The Journal of experimental biology
影响因子:
--
通讯作者:
N. Suzuki
N. Suzuki
中科院分区:
--
文献类型:
--
作者:
K. Sato;N. Suzuki

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目的:研究氨基酸诱导虹鳟纤毛嗅觉受体神经元(ORN)的内向电流(Oncorhynchusmykiss)的ORN包括一个Ca(2+)激活的Cl(-)电导,我们首先研究了ORN对氨基酸混合物反应的反转电位变化和电流/电压关系(l-丙氨酸、l-精氨酸、l-谷氨酸和l-正缬氨酸;均为10 mmol l(-)(1))与灌注和记录移液管溶液中不同浓度的Na(+)和Cl(-)。我们还研究了六种不同的Cl(-)通道阻断剂的影响,使用传统的全细胞电压钳技术的反应的ORN。使用双管微量移液器和压力喷射系统将氨基酸混合物和一种阻断剂局部应用于ORN的纤毛。反转电位的预期变化表明Ca(2+)激活的Cl(-)电导的贡献,根据外部和内部Na(+)和Cl(-)浓度,在正方向和负方向上发生。在0.5 mmol l(-)(1)浓度下,硝氟灭酸、氟灭酸、NPPB [5-硝基-2-(3-苯基丙基氨基)-苯甲酸酯]和DCDPC(3 ',5-二氯二苯胺-2-羧酸酯)可逆地阻断大多数ORN中氨基酸诱导的内向电流和背景活性。对于用标准林格氏溶液外部灌注的ORN,这些阻断剂的有效性从77%至91%不等。SITS(4-乙酰氨基-4 '-异硫氰酸基二苯乙烯-2,2'-二磺酸盐)在5.0 mmol l(-)(1)时不可逆地抑制生理反应(100%抑制),而DIDS(4,4 '-二异硫氰酸基二苯乙烯-2,2'-二磺酸盐)在5.0 mmol l(-)(1)时具有最小的抑制作用(45%)。尼氟灭酸诱导50%抑制(IC(50))的剂量为70 μ mol l(-)(1),该剂量专门针对Ca(2+)激活的Cl(-)通道的电流成分测定。我们的研究结果表明,这些阻断剂对Ca(2+)激活的Cl(-)通道没有特异性,并且这些通道的密度在各个ORN之间存在差异。我们的研究结果还表明,Ca(2+)激活的Cl(-)电导在嗅觉传导中起着重要作用,并允许鱼类适应各种离子环境。
To determine whether amino-acid-induced inward currents of ciliated olfactory receptor neurons (ORNs) in rainbow trout (Oncorhynchus mykiss) include a Ca(2+)-activated Cl(-) conductance, we first studied changes in reversal potential and the current/voltage relationships of the responses of ORNs to an amino acid mixture (l-alanine, l-arginine, l-glutamate and l-norvaline; all 10 mmol l(-)(1)) with different concentrations of Na(+) and Cl(-) in the perfusion and recording pipette solutions. We also examined the effects of six different Cl(-) channel blockers on the responses of ORNs using a conventional whole-cell voltage-clamp technique. The amino acid mixture and one blocker were applied focally to the cilia of ORNs using a double-barrelled micropipette and a pressure ejection system. The expected shifts in reversal potential, indicating the contribution of the Ca(2+)-activated Cl(-) conductance, occurred in both positive and negative directions depending on the external and internal Na(+) and Cl(-) concentrations. Niflumic acid, flufenamic acid, NPPB [5-nitro-2-(3-phenylpropylamino)-benzonate] and DCDPC (3', 5-dichlorodiphenylamine-2-carboxylate), at 0.5 mmol l(-)(1), reversibly blocked both the amino-acid-induced inward currents and the background activity in most ORNs. The effectiveness of these blocking agents varied from 77 to 91 % for ORNs perfused externally with standard Ringer's solution. SITS (4-acetamido-4'-isothiocyanatostilbene-2,2'-disulphonate), at 5.0 mmol l(-)(1), irreversibly inhibited the physiological response (100 % inhibition), whereas DIDS (4,4'-diisothiocyanatostilbene-2, 2'-disulphonate), at 5.0 mmol l(-)(1), had the smallest effect (45 %) of the inhibitors tested. The dose of niflumic acid inducing 50 % inhibition (IC(50)), determined specifically for the current component of the Ca(2+)-activated Cl(-) channels, was 70 micromol l(-)(1). Our results suggest that these blockers are not specific for Ca(2+)-activated Cl(-) channels and that the density of these channels varies between individual ORNs. Our results also show that the Ca(2+)-activated Cl(-) conductance plays an important role in olfactory transduction and allows fishes to adapt to various ionic environments.
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