Objectives: We aim to determine the effects of Botulinum toxin type A (BTX-A) on neuropathic pain behavior and the expression of P2X(3) receptor in dorsal root ganglion (DRG) in rats with neuropathic pain induced by L5 ventral root transection (L5 VRT).
Methods: Neuropathic pain was induced by L5 VRT in male Sprague-Dawley rats. Either saline or BTX-A was administered to the plantar surface. Behavioral tests were conducted preoperatively and at predefined postoperative days. The expression of P2X(3) receptors in DRG neurons was detected by immunoreactivity at postoperative days 3, 7, 14, and 21.
Results: The number of positive P2X(3) neurons in the ipsilateral L5 DRG increased significantly after L5 VRT (P<0.001). This increase persisted for at least 3 weeks after the operation. No significant changes in P2X(3) expression were detected in the contralateral L5, or in the L4 DRGs bilaterally. Subcutaneous administration of BTX-A, performed on the left hindpaw at days 4, 8, or 16 post VRT surgery, significantly reduced mechanical allodynia bilaterally and inhibited P2X(3) over-expression induced by L5 VRT.
Conclusions: L5 VRT led to over-expression of P2X(3) receptors in the L5 DRG and bilateral mechanical allodynia in rats. Subcutaneous injection of BTX-A significantly reversed the neuropathic pain behavior and the over-expression of P2X(3) receptor in nociceptive neurons. These data not only show over-expression of purinergic receptors in the VRT model of neuropathic pain but also reveal a novel mechanism of botulinum toxin action on nociceptive neurons.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1111/j.1526-4637.2011.01182.x | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Immunotherapy-Resistant Neuropathic Pain and Fatigue Predict Quality-of-Life in Contactin-Associated Protein-Like 2 Antibody Disease.
Ann Neurol
January 2025
Department of Neurology, Mayo Clinic, Jacksonville, Florida, USA.
The long-term clinical outcomes and associated prognostic factors in contactin-associated protein-like 2 (CASPR2)-antibody diseases are unknown. A total of 75 participants with CASPR2 antibodies were longitudinally assessed for disability, quality-of-life, and chronic pain. Although most symptoms improved within 6 months of treatment, neuropathic pain and fatigue were the most immunotherapy refractory, and persisted for up to 6 years.
View Article and Find Full Text PDFIntraoperative sensitization in trigeminal region caused by postherpetic neuralgia: a case report.
J Med Case Rep
January 2025
Department of Pain, The Third Xiangya Hospital and Institute of Pain Medicine, Central South University, Changsha, China.
Background: Interventional therapy of trigeminal neuropathic pain has been well documented; however, intraoperative monitoring and management of pain hypersensitivity remains barely reported, which may pose a great challenge for pain physicians as well as anesthesiologists.
Case Presentation: A 77-year-old Han Chinese male, who suffered from severe craniofacial postherpetic neuralgia, underwent pulsed radiofrequency of trigeminal ganglion in the authors' department twice. The authors successfully placed a radiofrequency needle through the foramen ovale during the first procedure with local anesthesia and intravenous sedation (dexmedetomidine).
Identification of Potential Intervention Targets Involved in Prior Exercise that Attenuates Peripheral Neuropathic Pain by Integrating Transcriptome and Whole-genome Bisulfite Sequencing Analyses.
Mol Neurobiol
January 2025
The Second School of Clinical Medical College, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, China.
Changes in DNA methylation and subsequent alterations in gene expression have opened a new direction in research related to the pathogenesis of peripheral neuropathic pain (PNP). This study aimed to reveal epigenetic perturbations underlying DNA methylation in the dorsal root ganglion (DRG) of rats with peripheral nerve injury in response to prior exercise and identify potential target genes involved. Male Sprague-Dawley rats were divided into three groups, namely, chronic constriction injury (CCI) of the sciatic nerve, CCI with prior 6-week swimming training (CCI_Ex), and sham operated (Sham).
View Article and Find Full Text PDFRole of stereotactic radiosurgery for intracranial epidermoid tumors: a systematic review to assess its safety, efficacy, and complication profile.
J Neurooncol
January 2025
University of Virginia, Charlottesville, VA, USA.
Background: Even a gross total resection of a benign epidermoid tumor (ET) carries a high risk of recurrence. The management strategy mostly involves redo surgical excision but at a significant cost of morbidity and mortality. The role of adjuvant radiation therapies in this scenario is still undefined.
View Article and Find Full Text PDF[Impact of dronabinol shortage on a population of chronic pain patients: A retrospective observational study].
Therapie
January 2025
Service de pharmacie clinique, pôle 8 cancérologie et spécialités médicales, centre hospitalier de Valenciennes, 59300 Valenciennes, France.
Objective: A supply shortage of dronabinol occurred between December 2023 and February 2024, forcing chronic pain patients to discontinue this treatment. We assessed the impact of this shortage on patients in our hospital.
Method: A retrospective observational study of patients treated with dronabinol was conducted.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!