miRNA-711 Binds and Activates TRPA1 Extracellularly to Evoke Acute and Chronic Pruritus.

miRNA-711 Binds and Activates TRPA1 Extracellularly to Evoke Acute and Chronic Pruritus.
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DOI:
10.1016/j.neuron.2018.06.039
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发表时间:
2018-08-08
期刊:
影响因子:
16.2
通讯作者:
Ji RR
Ji RR
中科院分区:
医学1区
文献类型:
--
作者:
Han Q;Liu D;Convertino M;Wang Z;Jiang C;Kim YH;Luo X;Zhang X;Nackley A;Dokholyan NV;Ji RR

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越来越多的证据表明,细胞外miRNA可能是疾病的生物标志物,但细胞外miRNA的生理相关性尚不清楚。我们发现,皮内注射miR-711在幼稚小鼠身上引起TRPA1依赖性瘙痒(抓挠)而不痛(擦拭)。细胞外灌流miR-711通过核心序列GGGACCC在表达TRPA1的异源细胞和本地感觉神经元上诱导TRPA1电流。计算机模拟表明,核心序列与TRPA1胞外S5-S6环上的几个残基结合,这对miR-711激活TRPA1是关键的,但不是异硫氰酸烯丙基酯。皮内接种人Myla细胞会导致免疫缺陷小鼠的淋巴瘤和慢性瘙痒,并与癌细胞分泌的血清miR-711水平增加有关。淋巴瘤引起的慢性瘙痒可被miR-711抑制剂和一种阻断miR-711/TRPA1相互作用的封闭肽抑制。我们的发现证明了细胞外裸露miRNAs作为瘙痒介质和离子通道调节器的非常规生理作用。
Increasing evidence suggests that extracellular miRNAs may serve as biomarkers of diseases, but the physiological relevance of extracellular miRNA is unclear. We find that intradermal cheek injection of miR-711 induces TRPA1-depedent itch (scratching) without pain (wiping) in naïve mice. Extracellular perfusion of miR-711 induces TRPA1 currents in both Trpa1-expressing heterologous cells and native sensory neurons through the core sequence GGGACCC. Computer simulations reveal that the core sequence binds several residues at the extracellular S5-S6 loop of TRPA1, which are critical for TRPA1 activation by miR-711 but not allyl isothiocyanate. Intradermal inoculation of human Myla cells induces lymphoma and chronic itch in immune- deficient mice, associated with increased serum levels of miR-711, secreted from cancer cells. Lymphoma-induced chronic itch is suppressed by miR-711 inhibitor and a blocking peptide that disrupts the miR-711/TRPA1 interaction. Our findings demonstrated an unconventional physiological role of extracellular naked miRNAs as itch mediators and ion channel modulators.
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