Abstract:
BACKGROUND:Acupuncture has been widely used for alleviating pain. However, its mechanisms remain largely enigmatic. OBJECTIVE:In the present study, we focused on whether the analgesic effect of electroacupuncture is related to its regulation on adenosine and substance P expression. METHODS:We established chronic inflammatory pain model in rats through a single injection of Complete Freund's Adjuvant, and then we treated animals using daily electroacupuncture. We applied seven bilateral sessions of electroacupuncture (ST36 and BL60, 0.5 to 1.5 mA, initial strength of 0.5 mA, increased by 0.5 mA every 10 minutes, for 30 minutes per session, one section per day) to Complete Freund's Adjuvant rats for seven days. The analgesic effect of electroacupuncture was evaluated by measuring paw withdrawal threshold in rats that received mechanical and thermal stimulation. RESULTS:Daily electroacupuncture stimulation effectively increased paw withdrawal threshold in Complete Freund's Adjuvant rats. Electroacupuncture increased the adenosine level in zusanli. A further study showed that electroacupuncture could decrease substance P, neurokinin-1 receptor, tumor necrosis factor-alpha, interleukin-1β, interleukin-6 and CD68 levels in dorsal root ganglion. Interestingly, direct injection of adenosine A1 or substance P receptor antagonists, or dorsal nerve root transection could significantly impair electroacupuncture induced analgesic actions in Complete Freund's Adjuvant rats could and reduce the levels of substance P, neurokinin-1 receptor, tumor necrosis factor-alpha, interleukin-1β, interleukin-6 and CD68. Finally, we confirmed that direct injection of adenosine A1 receptor agonist replicated the analgesic effect of electroacupuncture. CONCLUSION:Our results indicate regulation of adenosine-mediated substance P secretion. Substance P-mediated pathway may be involved in the analgesia process by electroacupuncture in rats.
journal_name
Arq Neuropsiquiatrjournal_title
Arquivos de neuro-psiquiatriaauthors
Zhang RY,Zhu BF,Wang LK,Song Y,Zhao JG,Guo Y,Zhao L,Chen Sdoi
10.1590/0004-282X20200078subject
Has Abstractpub_date
2020-10-01 00:00:00pages
617-623issue
10eissn
0004-282Xissn
1678-4227pii
S0004-282X2020001000617journal_volume
78pub_type
杂志文章abstract::Twenty seven patients with migraine without aura were investigated. The age was between 12 and 54 years; 5 were men and 22 women. The diagnosis of migraine was made according to the classification proposed by the International Headache Society. The method of visual evoked potential was performed with pattern reversal ...
journal_title:Arquivos de neuro-psiquiatria
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journal_title:Arquivos de neuro-psiquiatria
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