• Anesthesia and analgesia · Jul 2018

    Comparative Study

    Thermal A-δ Nociceptors, Identified by Transcriptomics, Express Higher Levels of Anesthesia-Sensitive Receptors Than Thermal C-Fibers and Are More Suppressible by Low-Dose Isoflurane.

    • Stephen J Raithel, Matthew R Sapio, Michael J Iadarola, and Andrew J Mannes.
    • From the Department of Perioperative Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland.
    • Anesth. Analg. 2018 Jul 1; 127 (1): 263-266.

    AbstractWe investigated the effect of isoflurane on 2 main types of thermal nociceptors: A-δ and C-fibers. Surprisingly, 1% inhaled isoflurane led to a hyperalgesic response to C-fiber thermal stimulation, whereas responses to A-δ thermal stimulation were blunted. We explored the hypothesis that differences in withdrawal behavior are mediated by differential expression of isoflurane-sensitive proteins between these types of thermal nociceptors. Multiple transcriptomic databases of peripheral neurons were integrated to reveal that isoflurane-susceptible proteins Htr3a, Kcna2, and Scn8a were enriched in thermosensitive A-δ neurons. This exploratory analysis highlights the differing role that volatile anesthetics might have on nociceptors in the peripheral nervous system.

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