The Korean Journal of Pain

The Korean Pain Society (대한통증학회)
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Therapeutic Effect of Epidurally Administered Lipo-Prostaglandin E1 Agonist in a Rat Spinal Stenosis Model

  • Park, Sang Hyun (Department of Anesthesiology and Pain Medicine, Jeju National University Hospital) ;
  • Lee, Pyung Bok (Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital) ;
  • Choe, Ghee Young (Department of Pathology, Seoul National University Bundang Hospital) ;
  • Moon, Jee Yeon (Department of Anesthesiology and Pain Medicine, Seoul National University Hospital) ;
  • Nahm, Francis Sahngun (Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital) ;
  • Kim, Yong Chul (Department of Anesthesiology and Pain Medicine, Seoul National University School of Medicine)
  • Received : 2014.04.24
  • Accepted : 2014.06.10
  • Published : 2014.07.01
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Abstract

Background: A lipo-prostaglandin E1 agonist is effective for the treatment of neurological symptoms of spinal stenosis when administered by an oral or intravenous route. we would like to reveal the therapeutic effect of an epidural injection of lipo-prostaglandin E1 on hyperalgesia in foraminal stenosis. Methods: A total of 40 male Sprague-Dawley rats were included. A small stainless steel rod was inserted into the L5/L6 intervertebral foramen to produce intervertebral foraminal stenosis and chronic compression of the dorsal root ganglia (DRG). The rats were divided into three groups: epidural PGE1 (EP) (n = 15), saline (n = 15), and control (n = 10). In the EP group, $0.15{\mu}g{\cdot}kg-1$ of a lipo-PGE1 agonist was injected daily via an epidural catheter for 10 days from postoperative day 3. In the saline group, saline was injected. Behavioral tests for mechanical hyperalgesia were performed for 3 weeks. Then, the target DRG was analyzed for the degree of chromatolysis, chronic inflammation, and fibrosis in light microscopic images. Results: From the fifth day after lipo-PGE1 agonist injection, the EP group showed significant recovery from mechanical hyperalgesia, which was maintained for 3 weeks (P < 0.05). Microscopic analysis showed much less chromatolysis in the EP group than in the saline or control groups. Conclusions: An epidurally administered lipo-PGE1 agonist relieved neuropathic pain, such as mechanical hyperalgesia, in a rat foraminal stenosis model, with decreasing chromatolysis in target DRG. We suggest that epidurally administered lipo-PGE1 may be a useful therapeutic candidate for patients with spinal stenosis.

Keywords

References

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