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Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats

Brain-derived neurotrophic factor (BDNF) signaling through its cognate receptor, TrkB, is a well-known promoter of synaptic plasticity at nociceptive synapses in the dorsal horn of the spinal cord. Existing evidence suggests that BDNF/TrkB signaling in neuropathic pain is sex dependent. We tested th...

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Autores principales: Moy, Jamie K., Szabo-Pardi, Thomas, Tillu, Dipti V., Megat, Salim, Pradhan, Grishma, Kume, Moeno, Asiedu, Marina N., Burton, Michael D., Dussor, Gregory, Price, Theodore J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6550116/
https://www.ncbi.nlm.nih.gov/pubmed/31194015
http://dx.doi.org/10.1016/j.ynpai.2018.10.001
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author Moy, Jamie K.
Szabo-Pardi, Thomas
Tillu, Dipti V.
Megat, Salim
Pradhan, Grishma
Kume, Moeno
Asiedu, Marina N.
Burton, Michael D.
Dussor, Gregory
Price, Theodore J.
author_facet Moy, Jamie K.
Szabo-Pardi, Thomas
Tillu, Dipti V.
Megat, Salim
Pradhan, Grishma
Kume, Moeno
Asiedu, Marina N.
Burton, Michael D.
Dussor, Gregory
Price, Theodore J.
author_sort Moy, Jamie K.
collection PubMed
description Brain-derived neurotrophic factor (BDNF) signaling through its cognate receptor, TrkB, is a well-known promoter of synaptic plasticity at nociceptive synapses in the dorsal horn of the spinal cord. Existing evidence suggests that BDNF/TrkB signaling in neuropathic pain is sex dependent. We tested the hypothesis that the effects of BDNF/TrkB signaling in hyperalgesic priming might also be sexually dimorphic. Using the incision postsurgical pain model in male mice, we show that BDNF sequestration with TrkB-Fc administered at the time of surgery blocks the initiation and maintenance of hyperalgesic priming. However, when BDNF signaling was blocked prior to the precipitation of hyperalgesic priming with prostaglandin E(2) (PGE(2)), priming was not reversed. This result is in contrast to our findings in male mice with interleukin-6 (IL6) as the priming stimulus where TrkB-Fc was effective in reversing the maintenance of hyperalgesic priming. Furthermore, in IL6-induced hyperalgesic priming, the BDNF sequestering agent, TrkB-fc, was effective in reversing the maintenance of hyperalgesic priming in male mice; however, when this experiment was conducted in female mice, we did not observe any effect of TrkB-fc. This markedly sexual dimorphic effect in mice is consistent with recent studies showing a similar effect in neuropathic pain models. We tested whether the sexual dimorphic role for BDNF was consistent across species. Importantly, we find that this sexual dimorphism does not occur in rats where TrkB-fc reverses hyperalgesic priming fully in both sexes. Finally, to determine the source of BDNF in hyperalgesic priming in mice, we used transgenic mice (Cx3cr1(CreER) × Bdnf(flx/flx) mice) with BDNF eliminated from microglia. From these experiments we conclude that BDNF from microglia does not contribute to hyperalgesic priming and that the key source of BDNF for hyperalgesic priming is likely nociceptors in the dorsal root ganglion. These experiments demonstrate the importance of testing mechanistic hypotheses in both sexes in multiple species to gain insight into complex biology underlying chronic pain.
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spelling pubmed-65501162019-06-11 Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats Moy, Jamie K. Szabo-Pardi, Thomas Tillu, Dipti V. Megat, Salim Pradhan, Grishma Kume, Moeno Asiedu, Marina N. Burton, Michael D. Dussor, Gregory Price, Theodore J. Neurobiol Pain Original Research Article Brain-derived neurotrophic factor (BDNF) signaling through its cognate receptor, TrkB, is a well-known promoter of synaptic plasticity at nociceptive synapses in the dorsal horn of the spinal cord. Existing evidence suggests that BDNF/TrkB signaling in neuropathic pain is sex dependent. We tested the hypothesis that the effects of BDNF/TrkB signaling in hyperalgesic priming might also be sexually dimorphic. Using the incision postsurgical pain model in male mice, we show that BDNF sequestration with TrkB-Fc administered at the time of surgery blocks the initiation and maintenance of hyperalgesic priming. However, when BDNF signaling was blocked prior to the precipitation of hyperalgesic priming with prostaglandin E(2) (PGE(2)), priming was not reversed. This result is in contrast to our findings in male mice with interleukin-6 (IL6) as the priming stimulus where TrkB-Fc was effective in reversing the maintenance of hyperalgesic priming. Furthermore, in IL6-induced hyperalgesic priming, the BDNF sequestering agent, TrkB-fc, was effective in reversing the maintenance of hyperalgesic priming in male mice; however, when this experiment was conducted in female mice, we did not observe any effect of TrkB-fc. This markedly sexual dimorphic effect in mice is consistent with recent studies showing a similar effect in neuropathic pain models. We tested whether the sexual dimorphic role for BDNF was consistent across species. Importantly, we find that this sexual dimorphism does not occur in rats where TrkB-fc reverses hyperalgesic priming fully in both sexes. Finally, to determine the source of BDNF in hyperalgesic priming in mice, we used transgenic mice (Cx3cr1(CreER) × Bdnf(flx/flx) mice) with BDNF eliminated from microglia. From these experiments we conclude that BDNF from microglia does not contribute to hyperalgesic priming and that the key source of BDNF for hyperalgesic priming is likely nociceptors in the dorsal root ganglion. These experiments demonstrate the importance of testing mechanistic hypotheses in both sexes in multiple species to gain insight into complex biology underlying chronic pain. Elsevier 2018-10-19 /pmc/articles/PMC6550116/ /pubmed/31194015 http://dx.doi.org/10.1016/j.ynpai.2018.10.001 Text en © 2018 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Original Research Article
Moy, Jamie K.
Szabo-Pardi, Thomas
Tillu, Dipti V.
Megat, Salim
Pradhan, Grishma
Kume, Moeno
Asiedu, Marina N.
Burton, Michael D.
Dussor, Gregory
Price, Theodore J.
Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats
title Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats
title_full Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats
title_fullStr Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats
title_full_unstemmed Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats
title_short Temporal and sex differences in the role of BDNF/TrkB signaling in hyperalgesic priming in mice and rats
title_sort temporal and sex differences in the role of bdnf/trkb signaling in hyperalgesic priming in mice and rats
topic Original Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6550116/
https://www.ncbi.nlm.nih.gov/pubmed/31194015
http://dx.doi.org/10.1016/j.ynpai.2018.10.001
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