Evidence for a role of protein kinase C in the sustained activation of rat dorsal horn neurons evoked by cutaneous mustard oil application.
The intracellular mechanisms involved in the sensitisation of spinal dorsal horn neurons brought about by sustained or repeated nociceptive inputs are unknown. The present experiments addressed any role of protein kinase (PKC) in sustained nociceptive responses of rat dorsal horn neurons by: (i) ionophoretic administration of PKC inhibitors whilst recording activity evoked by repeated cutaneous application of mustard oil; and (ii) assessing subcellular translocation of PKC evoked in spinal cord by cutaneous application of mustard oil. Both marked attenuation of mustard oil-induced neuronal activity by PKC inhibitors and selective translocation of PKC in spinal cord tissue ipsilateral to mustard oil application strongly supported a critical role of PKC in sustained nociceptive responses to mustard oil.
Munro
F E
FE
Department of Preclinical Veterinary Sciences, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Summerhall, UK.
Fleetwood-Walker
S M
SM
Mitchell
R
R
D000279:Administration, Cutaneous; D000818:Animals; D001665:Binding Sites / Q000187:drug effects; D002462:Cell Membrane / Q000378:metabolism; D003600:Cytosol / Q000378:metabolism; D008297:Male; D009149:Mustard Plant; D009474:Neurons / Q000187:drug effects* / Q000502:physiology; D015240:Phorbol 12,13-Dibutyrate / Q000378:metabolism; D010936:Plant Extracts / Q000494:pharmacology*; D010938:Plant Oils; D011493:Protein Kinase C / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D013116:Spinal Cord / Q000166:cytology / Q000187:drug effects* / Q000502:physiology
D010936:Plant Extracts; D010938:Plant Oils; D015240:Phorbol 12,13-Dibutyrate; D011493:Protein Kinase C; C027793:mustard oil