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| Content Provider | Springer Nature Link |
|---|---|
| Author | Fukuhara, Kayoko Ishikawa, Kozo Yasuda, Seiko Kishishita, Yusuke Kim, Hae Kyu Kakeda, Takahiro Yamamoto, Misa rii, Takafumi Ishikawa, Toshizo |
| Copyright Year | 2011 |
| Abstract | Neuropathic pain concurrent with mood disorder from peripheral nerve injury is a serious clinical problem that significantly affects quality of life. Recent studies have suggested that a lack of brain-derived neurotrophic factor (BDNF) in the limbic system may cause this pain–emotion. BDNF is induced in cultured neurons by 4-methylcatechol (4-MC), but the role of 4-MC-induced BDNF in pain–emotion is poorly understood. Thus, we assessed the possible involvement of BDNF in brain in depression-like behavior during chronic pain following peripheral nerve injury. In addition, we examined whether intracerebroventricular (i.c.v.) 4-MC prevents chronic pain in rats and produces an antidepressant effect. Sprague–Dawley rats implanted intracerebroventricularly with a PE-10 tube were subjected to chronic constriction injury (CCI). Pain was assessed by a reduction in paw withdrawal latency (PWL) to heat stimuli after CCI. We also used a forced swimming testing (FST; time of immobility, in seconds) from day 14 to day 21 after CCI. Modulation of pain and emotional behavior was performed by injection of PD0325901 (a MEK1/2 inhibitor). 4-MC (100 nM) was continuously administered i.c.v. for 3 days during the period from day 14 to day 21 after CCI. To block analgesic and antidepressant effects, anti-BDNF antibody or K252a (a TrkB receptor inhibitor) was injected in combination with 4-MC. Naloxone was also coadministered to confirm the analgesic effect of 4-MC. During the chronic stage after CCI, the rats showed a sustained decrease in PWL (thermal hyperalgesia) associated with extension of the time of immobility (depression-like behavior). PD0325901 significantly reduced the decrease in PWL and the increased time of immobility after CCI. The decreased PWL and increased time of immobility were also reduced by 4-MC and by treatment with an ERK1/2 inhibitor. These effects of 4-MC i.c.v. were reversed by anti-BDNF and K252a. The analgesic effect of 4-MC i.c.v. was also antagonized by naloxone. Based on these results, we suggest that a lack of BDNF and activation of ERK1/2 in the pain–emotion network in the CNS may be involved in depression-like behavior during chronic pain. 4-MC i.c.v. ameliorates chronic pain and depression-like behavior by producing of BDNF and normalization of ERK1/2 activation. Therefore, enhancement of BDNF may be a new treatment strategy for chronic pain associated with depression. |
| Starting Page | 971 |
| Ending Page | 977 |
| Page Count | 7 |
| File Format | |
| ISSN | 02724340 |
| Journal | Cellular and Molecular Neurobiology |
| Volume Number | 32 |
| Issue Number | 6 |
| e-ISSN | 15736830 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2011-12-25 |
| Publisher Place | Boston |
| Access Restriction | Subscribed |
| Subject Keyword | CCI Neuropathic pain Mood disorder BDNF 4-Methylcatechol ERK1/2 Neurosciences Neurobiology Cell Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Medicine Cellular and Molecular Neuroscience |
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