Cited by 59Pain Mechanisms and TreatmentsPain Management and TreatmentSpinal Cord Injury Research

Monoaminergic descending pathways contribute to modulation of neuropathic pain by increasing-intensity treadmill exercise after peripheral nerve injury

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Lopez-Alvarez, Victor M., Puigdomenech, Maria, Navarro, Xavier, Cobianchi, Stefano·2018·Experimental Neurology

Abstract

This study characterizes the impact of increasing-intensity treadmill exercise (iTR) on noradrenergic (NE) and serotonergic (5HT) modulation of neuropathic pain. Following sciatic nerve transection and repair (SNTR) rats developed significant mechanical and thermal hyperalgesia that was partially prevented by iTR performed during the first 2weeks after injury. Marked decrease in the expression of 5HT 2A and α 1A and β-, but not α 2A adrenergic receptors in the spinal cord dorsal horn was associated to SNTR and recovered by iTR, particularly in lamina II. iTR significantly increased 5HT 2A in periaqueductal grey (PAG), raphe magnus (RM) and dorsal raphe nucleus (DRN), with a pattern suggesting reorganization of serotonergic excitatory interconnections between PAG and DRN. iTR also increased the expression of α 1A in locus coeruleus (LC) and DRN, and β 2 in LC, indicating that exercise enhanced activity of NE neurons, likely by activating autologous projections from DRN and PAG. iTR hypoalgesia was antagonized by blockade of β 2 and 5HT 2A receptors with administration of butoxamine and ketanserin. The neurotoxin DSP4 was injected to induce depletion of NE projections from LC before starting iTR. DSP4 treatment worsened mechanical hyperalgesia, but iTR hypoalgesia was similarly produced. Moreover, 5HT 2A expression in LC further increased after DSP4 injection, all these results suggesting an intrinsic regulation of 5HT and NE activity between PAG, DRN and LC neurons activated by iTR. Finally, iTR significantly reduced microglial reactivity in LC and increased non-microglial BDNF expression, an effect that was reverted by butoxamine, implicating BDNF regulation in central 5HT/NE actions on neuropathic pain.

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Crossref · 10.1016/j.expneurol.2017.10.007

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  • G-protein-coupled receptor and MAPK- and IP3K-mediated signaling pathways regulate NA-dependent expression of the gene encoding BDNF.

    “The G-protein-coupled receptor and MAPK- and IP3K-mediated signaling pathways are indicated as those regulating the NA-dependent expression of the gene encoding BDNF [199,200].”

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Authors
Lopez-Alvarez, V. M., Puigdomenech, M., Navarro, X., & Cobianchi, S.
Affiliations
Universitat Autònoma de Barcelona (ES)
Corresponding author
Cobianchi, Stefano
Venue
Experimental Neurology
Publisher
Elsevier BV
Published
2018-01
Volume
299
Issue
Pt A
Pages
42-55
ISSN
0014-4886 (ISSN-L)
OpenAlex
W2762836585
Cited by
59
References
55
Citations by year
2026: 2 · 2025: 8 · 2024: 8 · 2023: 10 · 2022: 7 · 2021: 6 · 2020: 8 · 2019: 6 · 2018: 4
FWCI
3.64
Type
journal article
Language
en
Open access
Locations
  • Experimental Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Dipòsit Digital de Documents de la UAB (Universitat Autònoma de Barcelona) (submittedVersion, cc-by-nc-nd)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-nd)
Topics
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Health Sciences › Medicine › Anesthesiology and Pain Medicine › Pain Management and Treatment
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Spinal Cord Injury Research
Keywords
neuropathic pain, treadmill exercise, sciatic nerve transection, adrenergic receptors, 5-HT2A receptor, alpha1A-adrenergic receptor, beta2-adrenergic receptor, locus coeruleus, periaqueductal gray, dorsal raphe nucleus, microglial activation, brain-derived neurotrophic factor, butoxamine, ketanserin, DSP-4, hyperalgesia, descending pain modulation
MeSH terms
Animals, Female, Hyperalgesia, Neuralgia, Norepinephrine, Pain Measurement, Periaqueductal Gray, Physical Conditioning, Animal, Raphe Nuclei, Serotonin, Serotonin Antagonists, Biogenic Monoamines, Signal Transduction, Rats, Sprague-Dawley, Sciatic Neuropathy, Receptor, Serotonin, 5-HT2A, Rats, Adrenergic beta-2 Receptor Antagonists, Peripheral Nerve Injuries

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