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The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord

A cGMP signaling cascade composed of C-type natriuretic peptide, the guanylyl cyclase receptor Npr2 and cGMP-dependent protein kinase I (cGKI) controls the bifurcation of sensory axons upon entering the spinal cord during embryonic development. However, the impact of axon bifurcation on sensory proc...

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Autores principales: Tröster, Philip, Haseleu, Julia, Petersen, Jonas, Drees, Oliver, Schmidtko, Achim, Schwaller, Frederick, Lewin, Gary R., Ter-Avetisyan, Gohar, Winter, York, Peters, Stefanie, Feil, Susanne, Feil, Robert, Rathjen, Fritz G., Schmidt, Hannes
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5809486/
https://www.ncbi.nlm.nih.gov/pubmed/29472841
http://dx.doi.org/10.3389/fnmol.2018.00019
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author Tröster, Philip
Haseleu, Julia
Petersen, Jonas
Drees, Oliver
Schmidtko, Achim
Schwaller, Frederick
Lewin, Gary R.
Ter-Avetisyan, Gohar
Winter, York
Peters, Stefanie
Feil, Susanne
Feil, Robert
Rathjen, Fritz G.
Schmidt, Hannes
author_facet Tröster, Philip
Haseleu, Julia
Petersen, Jonas
Drees, Oliver
Schmidtko, Achim
Schwaller, Frederick
Lewin, Gary R.
Ter-Avetisyan, Gohar
Winter, York
Peters, Stefanie
Feil, Susanne
Feil, Robert
Rathjen, Fritz G.
Schmidt, Hannes
author_sort Tröster, Philip
collection PubMed
description A cGMP signaling cascade composed of C-type natriuretic peptide, the guanylyl cyclase receptor Npr2 and cGMP-dependent protein kinase I (cGKI) controls the bifurcation of sensory axons upon entering the spinal cord during embryonic development. However, the impact of axon bifurcation on sensory processing in adulthood remains poorly understood. To investigate the functional consequences of impaired axon bifurcation during adult stages we generated conditional mouse mutants of Npr2 and cGKI (Npr2(fl/fl);Wnt1(Cre) and cGKI(KO/fl);Wnt1(Cre)) that lack sensory axon bifurcation in the absence of additional phenotypes observed in the global knockout mice. Cholera toxin labeling in digits of the hind paw demonstrated an altered shape of sensory neuron termination fields in the spinal cord of conditional Npr2 mouse mutants. Behavioral testing of both sexes indicated that noxious heat sensation and nociception induced by chemical irritants are impaired in the mutants, whereas responses to cold sensation, mechanical stimulation, and motor coordination are not affected. Recordings from C-fiber nociceptors in the hind limb skin showed that Npr2 function was not required to maintain normal heat sensitivity of peripheral nociceptors. Thus, the altered behavioral responses to noxious heat found in Npr2(fl/fl);Wnt1(Cre) mice is not due to an impaired C-fiber function. Overall, these data point to a critical role of axonal bifurcation for the processing of pain induced by heat or chemical stimuli.
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spelling pubmed-58094862018-02-22 The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord Tröster, Philip Haseleu, Julia Petersen, Jonas Drees, Oliver Schmidtko, Achim Schwaller, Frederick Lewin, Gary R. Ter-Avetisyan, Gohar Winter, York Peters, Stefanie Feil, Susanne Feil, Robert Rathjen, Fritz G. Schmidt, Hannes Front Mol Neurosci Neuroscience A cGMP signaling cascade composed of C-type natriuretic peptide, the guanylyl cyclase receptor Npr2 and cGMP-dependent protein kinase I (cGKI) controls the bifurcation of sensory axons upon entering the spinal cord during embryonic development. However, the impact of axon bifurcation on sensory processing in adulthood remains poorly understood. To investigate the functional consequences of impaired axon bifurcation during adult stages we generated conditional mouse mutants of Npr2 and cGKI (Npr2(fl/fl);Wnt1(Cre) and cGKI(KO/fl);Wnt1(Cre)) that lack sensory axon bifurcation in the absence of additional phenotypes observed in the global knockout mice. Cholera toxin labeling in digits of the hind paw demonstrated an altered shape of sensory neuron termination fields in the spinal cord of conditional Npr2 mouse mutants. Behavioral testing of both sexes indicated that noxious heat sensation and nociception induced by chemical irritants are impaired in the mutants, whereas responses to cold sensation, mechanical stimulation, and motor coordination are not affected. Recordings from C-fiber nociceptors in the hind limb skin showed that Npr2 function was not required to maintain normal heat sensitivity of peripheral nociceptors. Thus, the altered behavioral responses to noxious heat found in Npr2(fl/fl);Wnt1(Cre) mice is not due to an impaired C-fiber function. Overall, these data point to a critical role of axonal bifurcation for the processing of pain induced by heat or chemical stimuli. Frontiers Media S.A. 2018-02-08 /pmc/articles/PMC5809486/ /pubmed/29472841 http://dx.doi.org/10.3389/fnmol.2018.00019 Text en Copyright © 2018 Tröster, Haseleu, Petersen, Drees, Schmidtko, Schwaller, Lewin, Ter-Avetisyan, Winter, Peters, Feil, Feil, Rathjen and Schmidt. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Tröster, Philip
Haseleu, Julia
Petersen, Jonas
Drees, Oliver
Schmidtko, Achim
Schwaller, Frederick
Lewin, Gary R.
Ter-Avetisyan, Gohar
Winter, York
Peters, Stefanie
Feil, Susanne
Feil, Robert
Rathjen, Fritz G.
Schmidt, Hannes
The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord
title The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord
title_full The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord
title_fullStr The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord
title_full_unstemmed The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord
title_short The Absence of Sensory Axon Bifurcation Affects Nociception and Termination Fields of Afferents in the Spinal Cord
title_sort absence of sensory axon bifurcation affects nociception and termination fields of afferents in the spinal cord
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5809486/
https://www.ncbi.nlm.nih.gov/pubmed/29472841
http://dx.doi.org/10.3389/fnmol.2018.00019
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