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Pain. 2015 Apr;156(4):656-65. doi: 10.1097/j.pain.0000000000000092.

Selective keratinocyte stimulation is sufficient to evoke nociception in mice.

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Departments of aNeurosurgery bBiological Chemistry cNeuroscience dNeurosurgery Pain Research Institute eCenter for Sensory Biology fDepartment of Anesthesiology and Critical Care Medicine gHoward Hughes Medical Institute, Johns Hopkins School of Medicine, Baltimore, MD, USA hDepartment of Biology, University of Virginia, Charlottesville, VA, USA.


The skin epidermis is densely innervated by peripheral sensory nerve endings. Nociceptive neurons, whose terminals are in close contact with epidermal keratinocytes, can be activated directly by noxious physical and chemical stimuli to trigger pain. However, whether keratinocytes can signal acutely to sensory nerve terminals to initiate pain in vivo remains unclear. Here, using the keratin 5 promoter to selectively express the capsaicin receptor TRPV1 in keratinocytes of TRPV1-knockout mice, we achieved specific stimulation of keratinocytes with capsaicin. Using this approach, we found that keratinocyte stimulation was sufficient to induce strong expression of the neuronal activation marker, c-fos, in laminae I and II of the ipsilateral spinal cord dorsal horn and to evoke acute paw-licking nocifensive behavior and conditioned place aversion. These data provide direct evidence that keratinocyte stimulation is sufficient to evoke acute nociception-related responses.

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