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Scandinavian Journal of Pain

Official Journal of the Scandinavian Association for the Study of Pain

Editor-in-Chief: Werner, Mads


CiteScore 2018: 0.85

SCImago Journal Rank (SJR) 2018: 0.494
Source Normalized Impact per Paper (SNIP) 2018: 0.427

Online
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1877-8879
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Volume 16, Issue 1

Issues

Effect of intrathecal glucocorticoids on the central glucocorticoid receptor in a rat nerve ligation model

Mienke Rijsdijk / Nilesh M. Agalave / Albert J.M. van Wijck / Cornelis J. Kalkman / Roshni Ramachandran / Azar Baharpoor / Camilla I. Svensson / Tony L. Yaksh
Published Online: 2017-07-01 | DOI: https://doi.org/10.1016/j.sjpain.2016.12.008

Abstract

Background and aims

Despite widespread use, the efficacy of neuraxial glucocorticoids for neuropathic painis subject to debate. Since most glucocorticoid actions are mediated through its receptor, we explored the effects of intrathecal methylprednisolone acetate (MPA) on total glucocorticoid receptor (tGR) levels and activation of the glucocorticoid receptor (phosphorylated state = pGR) within the spinal dorsal horn (SDH) and dorsal root ganglion (DRG) in a spinal nerve ligation (SNL) model in rats.

Methods

Rats received unilateral ligation of the L5/L6 spinal nerves and were treated with two intrathecal doses of either 400 μg MPA or 0.9% saline with a 72-h interval. Plantar tactile thresholds were measured over time. Seven days after drug treatment, DRG and SDH were harvested to assess tGR and pGR levels using immunohistochemistry and qPCR.

Results

Allodynia, defined by lowered tactile withdrawal thresholds after SNL, was unaltered by intrathecal MPA. In saline controls, mRNA levels of tGR did not change after SNL in the DRGs or SDH. tGR and pGR protein levels in the SDH however, significantly increased on the ipsilateral side of SNL compared to the contralateral side and to naïve tissue. When treating rats with MPA, tGR mRNA levels were significantly reduced in the SDH compared to saline controls. tGR and pGR protein levels, however were not significantly lower compared to saline controls.

Conclusions

In intrathecal MPA treated rats, tGR mRNA levels decreased after SNL. However this did not result in lower tGR and pGR protein levels compared to saline controls, and did not decrease ligation-induced mechanical hypersensitivity.

Implications

Intrathecal MPA treatment after SNL did not result in lower tGR and pGR levels within the SDH and DRG compared to saline controls. In present study we did not differentiate between the various isoforms of the GR which might clarify this finding.

Keywords: Intrathecal; Methylprednisolone acetate; Spinal nerve ligation; Mechanical allodynia; Glucocorticoid receptor; Rats

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About the article

Pain Clinic, Department of Anesthesiology, University Medical Center Utrecht, Heidelberglaan 100, 3584 CX, Utrecht, The Netherlands.


Received: 2016-04-03

Revised: 2016-12-30

Accepted: 2016-12-31

Published Online: 2017-07-01

Published in Print: 2017-07-01


Conflict of interest: None.

Authors’ contribution: M. Rijsdijk performed the research, R. Ramachandran, N.M. Agalave and A. Baharpoor participated in data collection, M Rijsdijk, T.L. Yaksh and C.I. Svensson designed the research study, C.I. Svensson, C.J. Kalkman and T.L. Yaksh contributed essential reagents and tools, M. Rijsdijk, C.I. Svensson, A.J.M. van Wijck, C.J. Kalkman and T.L. Yaksh analyzed the data, M. Rijsdijk wrote the paper and C.I. Svensson, A.J.M. van Wijck, C.J. Kalkman, R. Ramachandran, N.M. Agalave and T.L. Yaksh revised the manuscript. All authors approved the final manuscript.


Citation Information: Scandinavian Journal of Pain, Volume 16, Issue 1, Pages 1–9, ISSN (Online) 1877-8879, ISSN (Print) 1877-8860, DOI: https://doi.org/10.1016/j.sjpain.2016.12.008.

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