Hyperpolarization-activated cyclic nucleotide-gated 2 (HCN2) ion channels drive pain in mouse models of diabetic neuropathy.

Hyperpolarization-activated cyclic nucleotide-gated 2 (HCN2) ion channels drive pain in mouse models of diabetic neuropathy.
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DOI:
10.1126/scitranslmed.aam6072
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发表时间:
2017-09-27
影响因子:
17.1
通讯作者:
McNaughton PA
McNaughton PA
中科院分区:
医学1区
文献类型:
--
作者:
Tsantoulas C;Laínez S;Wong S;Mehta I;Vilar B;McNaughton PA

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糖尿病患者经常遭受持续疼痛,目前可用的止痛药治疗效果不佳。在这里,我们使用1型和2型糖尿病小鼠模型来研究超极化激活的环核苷酸门控2(HCN 2)离子通道作为糖尿病疼痛驱动因素的可能作用。阻断或基因删除小伤害性神经元中的HCN 2通道抑制了糖尿病相关的机械异常性疼痛,并阻止了小鼠脊髓中二级神经元的神经元激活。此外,我们发现,细胞内的环磷酸腺苷(cAMP),一个积极的HCN 2调节剂,增加了在疼痛的糖尿病动物模型的躯体感觉神经元。我们认为细胞内cAMP的增加通过促进HCN2的激活从而促进初级伤害性神经纤维的重复放电来驱动糖尿病相关疼痛。我们的研究结果表明,HCN 2可能是治疗疼痛性糖尿病神经病变的镇痛靶点。
Diabetic patients frequently suffer from continuous pain that is poorly treated by currently available analgesics. Here we used mouse models of Type 1 and Type 2 diabetes to investigate a possible role for the hyperpolarization-activated cyclic nucleotide–gated 2 (HCN2) ion channels as drivers of diabetic pain. Blocking or genetically deleting HCN2 channels in small nociceptive neurons suppressed diabetes-associated mechanical allodynia and prevented neuronal activation of second-order neurons in the spinal cord in mice. In addition, we found that intracellular cyclic adenosine monophosphate (cAMP), a positive HCN2 modulator, is increased in somatosensory neurons in an animal model of painful diabetes. We propose that the increased intracellular cAMP drives diabetes-associated pain by facilitating HCN2 activation and consequently promoting repetitive firing in primary nociceptive nerve fibers. Our results suggest that HCN2 may be an analgesic target in the treatment of painful diabetic neuropathy.
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