Extracellular microRNAs activate nociceptor neurons to elicit pain via TLR7 and TRPA1.
Extracellular microRNAs activate nociceptor neurons to elicit pain via TLR7 and TRPA1.
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DOI:
10.1016/j.neuron.2014.02.011
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发表时间:
2014-04-02
期刊:
影响因子:
16.2
通讯作者:
Ji RR
中科院分区:
文献类型:
--
作者:
Park CK;Xu ZZ;Berta T;Han Q;Chen G;Liu XJ;Ji RR
Intracellular microRNAs (miRNAs) are key regulators of gene expression. The role of extracellular miRNAs in neuronal activation and sensory behaviors are unknown. Here we report an unconventional role of extracellular miRNAs for rapid excitation of nociceptor neurons via toll-like receptor-7 (TLR7) and its coupling to TRPA1 ion channel. miRNA-let-7b induces rapid inward currents and action potentials in dorsal root ganglion (DRG) neurons. These responses require the GUUGUGU motif, only occur in neurons co-expressing TLR7 and TRPA1, and are abolished in mice lacking Tlr7 or Trpa1. Furthermore, let-7b induces TLR7/TRPA1-dependent single channel activities in DRG neurons and HEK293 cells over-expressing TLR7/TRPA1. Intraplantar injection of let-7b elicits rapid spontaneous pain via TLR7 and TRPA1. Finally, let-7b can be released from DRG neurons by neuronal activation, and let-7b inhibitor reduces formalin-induced TRPA1 currents and spontaneous pain. Thus, secreted extracellular miRNAs may serve as novelpain mediatorsvia activating TLR7 /TRPA1in nociceptor neurons.
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影响因子:
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影响因子:
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作者:
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DOI:
10.1073/pnas.1209414109
发表时间:
2012-07-31
影响因子:
11.1
作者:
Fabbri, Muller;Paone, Alessio;Croce, Carlo M.
通讯作者:
Croce, Carlo M.