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The role of dorsal root ganglia alpha-7 nicotinic acetylcholine receptor in complete Freund’s adjuvant-induced chronic inflammatory pain

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Abstract

Background

Alpha-7 nicotinic acetylcholine receptor (α7 nAChR) was reported to have a critical role in the regulation of pain sensitivity and neuroinflammation. However, the expression level of α7 nAChR in dorsal root ganglion (DRG) and the underlying neuroinflammatory mechanisms associated with hyperalgesia are still unknown.

Methods

In the present study, the expression and mechanism of α7 nAChR in chronic inflammatory pain was investigated using a complete Freund’s adjuvant (CFA)-induced chronic inflammatory pain model. Subsequently, a series of assays including immunohistochemistry, western blotting, and quantitative real-time polymerase chain reaction (qRT-PCR) were performed.

Results

α7 nAChR was mostly colocalized with NeuN in DRG and upregulated after CFA injection. Microinjection of α7 nAChR siRNA into ipsilateral L4/5 DRGs aggravated the CFA-induced pain hypersensitivity. Intrathecal α7 nAChR agonist GTS-21 attenuated the development of CFA-induced mechanical and temperature-related pain hypersensitivities. In neuronal the SH-SY5Y cell line, the knockdown of α7 nAChRs triggered the upregulation of TRAF6 and NF-κB under CFA-induced inflammatory conditions, while agitation of α7 nAChR suppressed the TRAF6/NF-κB activation. α7 nAChR siRNA also exacerbated the secretion of pro-inflammatory mediators from LPS-induced SH-SY5Y cells. Conversely, α7 nAChR-specific agonist GTS-21 diminished the release of interleukin-1beta (IL-1β), IL-6, IL-8, and tumor necrosis factor-α (TNFα) in SH-SY5Y cells under inflammatory conditions. Mechanistically, the modulation of pain sensitivity and neuroinflammatory action of α7 nAChR may be mediated by the TRAF6/NF-κB signaling pathway.

Conclusions

The findings of this study suggest that α7 nAChR may be potentially utilized as a therapeutic target for therapeutics of chronic inflammatory pain.

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Funding

This study was supported by the National Natural Science Foundation of China (No. 81401576); Shanghai Municipal Commission of Health and Family Planning, China (No. 20164Y0263). The authors would like to express their gratitude to EditSprings (https://www.editsprings.com/) for the expert linguistic services provided.

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Contributions

(I) Conception and design: XZ, LH; (II) Administrative support: JL, LH; (III) Provision of study materials or patients: all authors; (IV) Collection and assembly of data: all authors; (V) Data analysis and interpretation: all authors; (VI) Manuscript writing: all authors; (VII) Final approval of manuscript: all authors.

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Correspondence to Jianhai Zhang or Lina Huang.

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The authors have no conflicts of interest to declare.

Ethical statement

The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. The animal experiments were approved by the Laboratory Animal Ethics Committee of International Peace Maternity & Child Health Hospital (Shanghai, China).

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10787_2021_873_MOESM1_ESM.tif

Supplementary file1 Supplementary Fig. 1. Effect of intrathecal α7 nAChR agonist GTS-21 on basal responses on the contralateral side. A–C Effect of intrathecal vehicle or 20,000 nM/mice GTS-21 on paw withdrawal frequencies to mechanical stimulation, paw withdrawal latencies to heat, and cold stimuli on 3 day post-CFA injection or sham surgery. n = 6 mice/group. Two-way analysis of variance (ANOVA) followed by Bonferroni post hoc test. D–F Dose-dependent effect of intrathecal GTS-21 or vehicle on paw withdrawal frequency to mechanical stimuli and paw withdrawal latencies to heat and cold stimuli on day 3 post-CFA injection. n = 6 mice/group. Two-way analysis of variance (ANOVA) followed by Bonferroni post hoc test (TIF 1295 kb)

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Zhang, X., Xu, F., Wang, L. et al. The role of dorsal root ganglia alpha-7 nicotinic acetylcholine receptor in complete Freund’s adjuvant-induced chronic inflammatory pain. Inflammopharmacol 29, 1487–1501 (2021). https://doi.org/10.1007/s10787-021-00873-0

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