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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Jeong, Hyo-jin Mitchell, Vanessa A. Vaughan, Christopher W. |
| Description | Author Affiliation: Jeong HJ ( Pain Management Research Institute, Kolling Institute of Medical Research, Northern Clinical School, University of Sydney at Royal North Shore Hospital, NSW, Australia. hyo.jeong@sydney.edu.au) |
| Abstract | BACKGROUND AND PURPOSE: 5-HT receptor agonists have variable nociceptive effects within the spinal cord. While there is some evidence for 5-HT(1A) spinally-mediated analgesia, the role of other 5-HT(1) receptor subtypes remains unclear. In the present study, we examined the spinal actions of a range of 5-HT(1) agonists, including sumatriptan, on acute pain, plus their effect on afferent-evoked synaptic transmission onto superficial dorsal horn neurons. EXPERIMENTAL APPROACH: For in vivo experiments, 5-HT agonists were injected via chronically implanted spinal catheters to examine their effects in acute mechanical and thermal pain assays using a paw pressure analgesymeter and a Hargreave's device. For in vitro experiments, whole-cell patch-clamp recordings of primary afferent-evoked glutamatergic EPSC were made from lamina II neurons in rat lumbar spinal slices. KEY RESULTS: Intrathecal (i.t.) delivery of the 5-HT(1A) agonist R ± 8-OH-DPAT (30-300 nmol) produced a dose-dependent thermal, but not mechanical, analgesia. Sumatriptan and the 5-HT(1B), 5-HT(1D), 5-HT(1F) agonists CP93129, PNU109291 and LY344864 (100 nmol) had no effect on either acute pain assay. R ± 8-OH-DPAT (1 µM) and sumatriptan (3 µM) both reduced the amplitude of the evoked EPSC. In contrast, CP93129, PNU109291 and LY344864 (0.3-3 µM) had no effect on the evoked EPSC. The actions of both R ± 8-OH-DPAT and sumatriptan were abolished by the 5-HT(1A) antagonist WAY100635 (3 µM). CONCLUSIONS AND IMPLICATIONS: These findings indicate that the 5-HT(1A) receptor subtype predominantly mediates the acute antinociceptive and cellular actions of 5-HT(1) ligands within the rat superficial dorsal horn. |
| ISSN | 00071188 |
| e-ISSN | 14765381 |
| Journal | British Journal of Pharmacology |
| Issue Number | 6 |
| Volume Number | 165 |
| Language | English |
| Publisher | Wiley Online Library(on behalf of The British Pharmacological Society) |
| Publisher Date | 2012-03-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Open |
| Subject Keyword | Acute Pain Physiopathology Posterior Horn Cells Physiology Receptors, Serotonin, 5-HT1 Synaptic Transmission Drug Therapy Analgesics Pharmacology Therapeutic Use Animals Drug Effects Rats, Sprague-Dawley Serotonin Receptor Agonists Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Pharmacology |
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