Osmolality-induced tuning of action potentials in trigeminal ganglion neurons.

Osmolality-induced tuning of action potentials in trigeminal ganglion neurons.
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DOI:
10.1016/j.neulet.2009.01.022
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发表时间:
2009-03-06
影响因子:
2.5
通讯作者:
Liu L
Liu L
中科院分区:
医学4区
文献类型:
--
作者:
Chen L;Liu C;Liu L

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本研究探讨了异质性对培养三叉神经节(TG)神经元动作电位(AP)的影响。我们证明,低渗和高渗处理都能增加诱发的AP的数量。瞬时受体电位香草酸受体(TRPV4)激动剂可增加−/−小鼠AP数目,但仅阻断低张反应。此外,抑制PKC可减弱低张引起的升高,而拮抗PKA则可减弱高张反应。我们的结论是,各向同性增加了伤害性感受器的兴奋性,这可能与各向同性诱导的伤害性有关。低张和高张引起的AP增加是通过不同的受体和细胞内信号通路介导的。
The present study explored the effect of anisotonicity on action potential (AP) in cultured trigeminal ganglion (TG) neurons. We demonstrate that the number of evoked APs was increased by both hypo- and hypertonic treatment. Transient Receptor Potential Vanilloid 4 receptor (TRPV4) activator increased the number of APs, but only hypotonic-response was markedly blocked in TRPV4−/− mice. Additionally, inhibition of PKC attenuated hypotonicity-induced increase, whereas antagonism of PKA attenuated hypertonicity-response. We conclude that anisotonicity increases excitability of nociceptors, which might be involved in anisotonicity-induced nociception. The increase of APs by hypo- and hypertonicity is mediated through different receptor and intracellular signaling pathways.
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