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Ca++/CaMKII switches nociceptor-sensitizing stimuli into desensitizing stimuli

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons50297

Hucho,  T.
Signal Transduction in Mental Retardation and Pain (Tim Hucho), Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50579

Suckow,  V.
Signal Transduction in Mental Retardation and Pain (Tim Hucho), Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons50501

Ropers,  H.-H.
Dept. of Human Molecular Genetics (Head: Hans-Hilger Ropers), Max Planck Institute for Molecular Genetics, Max Planck Society;

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Hucho.pdf
(Publisher version), 820KB

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Citation

Hucho, T., Suckow, V., Joseph, E. K., Kuhn, J., Schmoranzer, J., Dina, O. A., et al. (2012). Ca++/CaMKII switches nociceptor-sensitizing stimuli into desensitizing stimuli. Journal of Neurochemistry: official journal of the International Society for Neurochemistry, 123(4), 589-601. doi:10.1111/j.1471-4159.2012.07920.x.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-EC70-1
Abstract
Many extracellular factors sensitize nociceptors. Often they act simultaneously and/or sequentially on nociceptive neurons. We investigated if stimulation of the protein kinase C epsilon (PKCepsilon) signaling pathway influences the signaling of a subsequent sensitizing stimulus. Central in activation of PKCs is their transient translocation to cellular membranes. We found in cultured nociceptive neurons that only a first stimulation of the PKCepsilon signaling pathway resulted in PKCepsilon translocation. We identified a novel inhibitory cascade to branch off upstream of PKCepsilon, but downstream of Epac via IP3-induced calcium release. This signaling branch actively inhibited subsequent translocation and even attenuated ongoing translocation. A second 'sensitizing' stimulus was rerouted from the sensitizing to the inhibitory branch of the signaling cascade. Central for the rerouting was cytoplasmic calcium increase and CaMKII activation. Accordingly, in behavioral experiments, activation of calcium stores switched sensitizing substances into desensitizing substances in a CaMKII-dependent manner. This mechanism was also observed by in vivo C-fiber electrophysiology corroborating the peripheral location of the switch. Thus, we conclude that the net effect of signaling in nociceptors is defined by the context of the individual cell's signaling history.