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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Yu, Jianbo Zhao, Cong Luo, Xiaoqin |
| Description | Author Affiliation: Yu J ( Department of Anesthesiology, Tianjin Nankai Hospital, Tianjin Medical University, Sanwei Road 122, Nankai District, Tianjin, People's Republic of China 300100. yujianbo11@126.com) |
| Abstract | BACKGROUND: Electroacupuncture (EA), as a traditional clinical method, is widely accepted in pain clinics, but the analgesic effect of EA has not been fully demonstrated. In the present study, we investigated the effect of EA on chronic pain and expression of P2X3 receptors in the spinal cord of rats with chronic constriction injury (CCI). METHODS: The study was conducted in 2 parts. In part 1, Sprague Dawley rats were divided into 6 groups (n = 10): sham-CCI, CCI, LEA; CCI + 2 Hz EA at acupoints), HEA; CCI + 15 Hz EA at acupoints), NA-LEA (CCI + 2 Hz EA at nonacupoints), and NA-HEA (CCI + 15 Hz EA at nonacupoints). EA treatment was performed once a day on days 4 to 9 after CCI. Nociception was assessed using von Frey filaments and a hotplate apparatus. The protein and the messenger RNA (mRNA) levels of P2X3 receptors in the spinal cord were assayed by Western blotting and real-time polymerase chain reaction, respectively. In part 2, rats were divided into 5 groups (n = 10): sham-CCI, CCI, EA (CCI + EA at acupoints), NA-EA (CCI + EA at nonacupoints), and U0126 (CCI + intrathecal injection of U0126). EA treatment was conducted similar to part 1. Rats were given 5 µg U0126 in the U0126 group and 5% dimethyl sulfoxide intrathecally. Ten microliters was used as a vehicle for the other 4 groups twice a day on days 4 to 9 after CCI. Extracellular signal-regulated kinase 1/2 (ERK1/2) and ERK1/2 phosphorylation in the spinal cord were also assayed by Western blotting. RESULTS: EA treatment exhibited significant antinociceptive effects and reduced the CCI-induced increase of both protein and mRNA expression of P2X3 receptors in the spinal cord. Furthermore, 2 Hz EA had a better analgesic effect than 15 Hz EA, and the protein and mRNA level of P2X3 receptor in spinal cord were lower in rats treated with 2 Hz EA at acupoints than 15 Hz EA at acupoints. Either EA at acupoints or intrathecal injection of U0126 relieved allodynia and hyperalgesia and reduced the expression of P2X3 receptors and ERK1/2 phosphorylation in the spinal cord. CONCLUSIONS: The data demonstrated that EA alleviates neuropathic pain behavior, at least in part, by reducing P2X3 receptor expression in spinal cord via the ERK1/2 signaling pathway. Low frequency EA has a better analgesic effect than high frequency HEA on neuropathic pain. |
| File Format | HTM / HTML |
| ISSN | 00032999 |
| Issue Number | 1 |
| Volume Number | 116 |
| e-ISSN | 15267598 |
| Journal | Anesthesia & Analgesia |
| Language | English |
| Publisher | Lippincott Williams & Wilkins |
| Publisher Date | 2013-01-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Anesthesiology Constriction, Pathologic Physiopathology Electroacupuncture Mitogen-activated Protein Kinase 1 Physiology Mitogen-activated Protein Kinase 3 Receptors, Purinergic P2x3 Signal Transduction Spinal Cord Animals Behavior, Animal Blotting, Western Butadienes Administration & Dosage Pharmacology Enzyme Inhibitors Hot Temperature Injections, Spinal Male Biosynthesis Genetics Nitriles Pain Measurement Methods Physical Stimulation Rna, Messenger Rats Rats, Sprague-dawley Real-time Polymerase Chain Reaction Sciatic Neuropathy Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Anesthesiology and Pain Medicine |
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