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Journal of visualized experiments : JoVE2018; (139); 58023; doi: 10.3791/58023

Nerve Stimulator-guided Injection of Autologous Stem Cells Near the Equine Left Recurrent Laryngeal Nerve.

Abstract: Recurrent laryngeal neuropathy (RLN) commonly affects horses and is characterized by abnormal respiratory sounds and exercise intolerance. The recurrent laryngeal nerve shows lesions of demyelination. The benefit of applying stem cells to demyelinated nerves has been demonstrated in various animal models. The aim of the study was to test the feasibility and safety of a peri-neuronal injection of autologous muscle-derived mesenchymal stem cells to the left recurrent laryngeal nerve in healthy horses by using an electrical nerve stimulator. Muscle-derived stems cell are obtained from five healthy Standardbred horses by sampling 20 mg of muscle tissue with a semi-automatic 14 G biopsy needle from the triceps muscle. Movements of the larynx are monitored via upper-airway video endoscopy. The left recurrent laryngeal nerve is approached with an insulated nerve block needle. Nerve stimulation is applied, starting at 2 mA, and the successful abduction of the left arytenoid is monitored. The stimulation intensity is reduced progressively. When a loss of the motor response is observed at 0.5 mA, 10 autologous muscle-derived stem cells are injected. Two examiners, who are blinded to the time point, score the laryngeal function of the horses prior to the treatment and at day 1, day 7, and day 28 after the injection of the cells. In a sixth horse, 1 mL of 2% lidocaine is injected to further confirm the correct positioning of the needle. This leads to a temporary paralysis of the left arytenoid cartilage. This study proves that the recurrent laryngeal nerve can be approached with the help of an electrical nerve stimulator and that the electrical stimulation of the nerve is well tolerated by the horses. No modification of the laryngeal function was observed in any of the horses after the injection of the stem cells. Further studies should be conducted to describe the effects of a peri-neuronal injection of autologous muscle-derived mesenchymal stem cells to horses suffering from RLN.
Publication Date: 2018-09-26 PubMed ID: 30320737PubMed Central: PMC6235316DOI: 10.3791/58023Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't
  • Video-Audio Media

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research investigated the feasibility and safety of using a nerve stimulator-guided injection of stem cells directly to a nerve in horses, which is a proposed treatment for a common equine neurological disorder.

Research Objectives

  • The central aim of this study was to explore the feasibility and safety of injecting autologous muscle-derived mesenchymal stem cells into the left recurrent laryngeal nerve in healthy horses. The researchers delivered these cells using an electrical nerve stimulator to guide the nerve’s approach.
  • The intent behind the use of stem cells was to leverage their potential in aiding the recovery of demyelinated nerves, as demonstrated in other animal models.

Methods

  • Stem cells were sourced from the muscle tissues of five healthy Standardbred horses. These tissues were sampled using a semi-automatic biopsy needle.
  • The researchers then monitored the movements of the horses’ larynx using upper-airway video endoscopy.
  • They approached the left recurrent laryngeal nerve with an insulated nerve block needle, applying nerve stimulation that began at 2 mA.
  • Upon observing a successful abduction of the left arytenoid (part of the larynx), they gradually reduced the stimulation intensity until a loss of motor response was noticed at 0.5 mA, at which point they injected the stem cells.

Results

  • After the procedure, two independent examiners, who lacked knowledge about the timepoint of the treatment, evaluated the laryngeal function of the horses. Assessments occurred before the treatment, as well as 1, 7, and 28 days after the stem cell injection.
  • The study found that using an electrical nerve stimulator to approach the recurrent laryngeal nerve is doable and that the electrical stimulation of the nerve is well tolerated by the horses.
  • No changes in laryngeal function were observed in any of the horses after the stem cell injection.

Further Investigation

  • The researchers suggest that more studies should be performed to understand the impact of injecting autologous muscle-derived mesenchymal stem cells in horses affected by Recurrent laryngeal neuropathy (RLN).
  • As a control, one additional horse received an injection of lidocaine which temporarily paralyzed the left arytenoid cartilage, further affirming the proper positioning of the injection needle.

Cite This Article

APA
Sandersen C, Ceusters J, Fourez A, Tosi I, Graide H, Lejeune JP, Serteyn D. (2018). Nerve Stimulator-guided Injection of Autologous Stem Cells Near the Equine Left Recurrent Laryngeal Nerve. J Vis Exp(139), 58023. https://doi.org/10.3791/58023

Publication

ISSN: 1940-087X
NlmUniqueID: 101313252
Country: United States
Language: English
Issue: 139
PII: 58023

Researcher Affiliations

Sandersen, Charlotte
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege; charlotte.sandersen@uliege.be.
Ceusters, Justine
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege.
Fourez, Alexia
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege.
Tosi, Irene
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege.
Graide, Helene
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege.
Lejeune, Jean-Philippe
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege; Mont-le-Soie Equine Research Centre.
Serteyn, Didier
  • Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Liege; Mont-le-Soie Equine Research Centre.

MeSH Terms

  • Animals
  • Electric Stimulation / instrumentation
  • Electric Stimulation / methods
  • Horse Diseases / pathology
  • Horse Diseases / physiopathology
  • Horses
  • Injections / methods
  • Injections / veterinary
  • Larynx / physiopathology
  • Neurosurgical Procedures / methods
  • Neurosurgical Procedures / veterinary
  • Recurrent Laryngeal Nerve / pathology
  • Recurrent Laryngeal Nerve / physiopathology
  • Stem Cell Transplantation / methods
  • Stem Cell Transplantation / veterinary
  • Stem Cells

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Citations

This article has been cited 1 times.
  1. Cequier A, Sanz C, Rodellar C, Barrachina L. The Usefulness of Mesenchymal Stem Cells beyond the Musculoskeletal System in Horses. Animals (Basel) 2021 Mar 25;11(4).
    doi: 10.3390/ani11040931pubmed: 33805967google scholar: lookup