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Expression of activating transcription factor 3 (ATF3) in uninjured dorsal root ganglion neurons in a lower trunk avulsion pain model in rats

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Abstract

Purpose

Clinically, neuropathic pain is frequent and intense following brachial plexus injury. It is thought that brachial plexus pain is not generated by avulsed roots, but rather by non-avulsed roots, since the avulsed root could not possibly transmit action potentials to central nerves. The aim of this study was to evaluate pain behavior and activation of sensory neurons in a brachial plexus avulsion (BPA) model in rats.

Methods

Fifteen male Wistar rats were used. In the BPA group, the C8–T1 roots were avulsed from the spinal cord with forceps at the lower trunk level (n = 5). In the naïve group, rats did not receive any procedures (n = 5). In the sham-operated group, the lower trunk was simply exposed (n = 5). Mechanical hyperalgesia of forelimbs corresponding to C6 and C7 dermatomes was measured using von Frey filaments every third day for 3 weeks. Activation of DRG neurons was immunohistochemically examined using anti-ATF3 (a marker for neuron activation) antibodies 21 days after surgery. Von Frey and immunohistochemical data between groups were analyzed using a Kruskal–Wallis test, followed by Mann–Whitney U tests. Bonferroni corrections were performed.

Results

Animals in the BPA group displayed significant mechanical hyperalgesia at the dermatome innervated by uninjured nerves continuing through day 21 compared with animals in the sham-operated group. ATF3-immunoreactive small and large DRG neurons were significantly activated in the BPA group (10.6 ± 9.5 and 5.2 ± 4.1 %, 39.7 ± 6.7 and 25.2 ± 10.3 %, 78.0 ± 9.1 and 53.7 ± 29.3 %) compared with the sham-operated group (0.7 ± 0.9 and 0 ± 0 %, 2.8 ± 2.0 and 1.0 ± 2.0 %, 3.9 ± 2.7 and 8.6 ± 10.1 %) at every level of C5, 6, and 7. In the naïve group, no DRG neurons were activated. ATF3-immunoreactive small and large DRG neurons were significantly activated at the level of C7 compared with C6 and C5, and significantly activated at the level of C6 compared with C5 in the BPA group.

Conclusions

Expression of ATF3 in uninjured DRG neurons may contribute to pain following brachial plexus avulsion injury. Consequently, spared spinal sensory nerves may represent therapeutic targets for treatment of this pain.

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Authors and Affiliations

  1. Department of Orthopaedic Surgery, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba, 260-8670, Japan

    Yusuke Matsuura, Seiji Ohtori, Nahoko Iwakura, Takane Suzuki, Kazuki Kuniyoshi & Kazuhisa Takahashi

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  1. Yusuke Matsuura
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  2. Seiji Ohtori
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  3. Nahoko Iwakura
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  4. Takane Suzuki
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  5. Kazuki Kuniyoshi
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  6. Kazuhisa Takahashi
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Correspondence to Yusuke Matsuura.

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Matsuura, Y., Ohtori, S., Iwakura, N. et al. Expression of activating transcription factor 3 (ATF3) in uninjured dorsal root ganglion neurons in a lower trunk avulsion pain model in rats. Eur Spine J 22, 1794–1799 (2013). https://doi.org/10.1007/s00586-013-2733-5

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  • DOI: https://doi.org/10.1007/s00586-013-2733-5

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