首页> 美国卫生研究院文献>The Journal of Neuroscience >Differential properties of tetrodotoxin-sensitive and tetrodotoxin- resistant sodium channels in rat dorsal root ganglion neurons
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Differential properties of tetrodotoxin-sensitive and tetrodotoxin- resistant sodium channels in rat dorsal root ganglion neurons

机译:大鼠背根神经节神经元中河豚毒素敏感性和河豚毒素抵抗性钠通道的差异性

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摘要

TTX-sensitive (TTX-S) and TTX-resistant (TTX-R) sodium channel currents were analyzed in acutely dissociated dorsal root ganglion (DRG) neurons isolated from 3–12-d-old and adult rats. Currents were recorded using the whole-cell patch-clamp technique. TTX-R current was more likely to be present in younger animals (3–7 d), whereas TTX-S current was more common in older animals (7–10 d), although TTX-R current was recorded from adult rat DRG neurons. The TTX-R and TTX-S currents differed in their steady-state inactivation, with 50% inactivation voltage at -40 +/- 5 mV (n = 10) for TTX-R currents and -70 +/- 4 mV (n = 10) for TTX- S currents. These current types also differed in their activation kinetics, with 50% activation values of -15 +/- 5 mV (n = 5) for TTX-R currents and -26 +/- 6 mV (n = 5) for TTX-S currents. The interactions of TTX-R and TTX-S channels with various pharmacological agents and divalent cations were studied. The Kd values for TTX-S and TTX-R currents were estimated to be 0.3 nM and 100 microM for TTX, 0.5 nM and 10 microM for saxitoxin, and 50 microM and 200 microM for lidocaine, respectively. TTX-S channels did not exhibit a marked use-dependent block by lidocaine, whereas lidocaine significantly decreased TTX-R current in a use-dependent manner at frequencies ranging from 1 to 33.3 Hz. Several external divalent cations exerted different effects on these current types.(ABSTRACT TRUNCATED AT 250 WORDS)
机译:在从3-12岁的成年大鼠和成年大鼠中分离出的急性解离的背根神经节(DRG)神经元中,分析了TTX敏感(TTX-S)和TTX抵抗(TTX-R)钠通道电流。使用全细胞膜片钳技术记录电流。尽管从成年大鼠DRG神经元记录了TTX-R电流,但幼小的动物(3-7 d)中更可能存在TTX-R电流,而在较老的动物(7-10 d)中更常见。 。 TTX-R和TTX-S电流的稳态失活有所不同,对于TTX-R电流,在-40 +/- 5 mV(n = 10)时有50%的失活电压,而-70 +/- 4 mV(n = 10)用于TTX- S电流。这些电流类型的激活动力学也有所不同,TTX-R电流的50%激活值为-15 +/- 5 mV(n = 5),TTX-S的激活值为-26 +/- 6 mV(n = 5)潮流。研究了TTX-R和TTX-S通道与各种药理剂和二价阳离子的相互作用。估计TTX-S和TTX-R电流的Kd值分别为:TTX为0.3 nM和100 microM,毒毒素为0.5 nM和10 microM,利多卡因为50 microM和200 microM。 TTX-S通道未显示利多卡因对使用的依赖性明显阻断,而利多卡因在1至33.3 Hz的频率下以使用依赖的方式显着降低了TTX-R电流。几种外部二价阳离子对这些电流类型产生不同的影响。(摘要截短为250字)

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