Spinal Serotonergic and Opioid Receptors Are Involved in Electroacupuncture-Induced Antinociception at Different Frequencies on ZuSanLi (ST 36) Acupoint
Pretreatment with 5,7-DHT influences EAc-induced antinociception in different frequencies on the 1st (a, b, c) and 7th (d, e, f) days. (a), (d): 1 mA, 2 Hz EAc; (b), (e): 1 mA, 10 Hz EAc; (c), (f): 1 mA, 100 Hz EAc; : initiation point of EAc except sham group. ○: sham group. : ACSF (artificial CSF). ▲: 5, 7-DHT (5,7-dihydroxy tryptamine, serotonin neurotoxin, 100 μg/10 μL, i.t.). Data are shown as mean ± S.E. , , and compared to the ACSF group ().