The cumulative analgesic effect of repeated electroacupuncture involves synaptic remodeling in the hippocampal CA3 region.

Abstract:

:In the present study, we examined the analgesic effect of repeated electroacupuncture at bilateral Zusanli (ST36) and Yanglingquan (GB34) once a day for 14 consecutive days in a rat model of chronic sciatic nerve constriction injury-induced neuropathic pain. In addition, concomitant changes in calcium/calmodulin-dependent protein kinase II expression and synaptic ultrastructure of neurons in the hippocampal CA3 region were examined. The thermal pain threshold (paw withdrawal latency) was increased significantly in both groups at 2 weeks after electroacupuncture intervention compared with 2 days of electroacupuncture. In ovariectomized rats with chronic constriction injury, the analgesic effect was significantly reduced. Electroacupuncture for 2 weeks significantly diminished the injury-induced increase in synaptic cleft width and thinning of the postsynaptic density, and it significantly suppressed the down-regulation of intracellular calcium/calmodulin-dependent protein kinase II expression in the hippocampal CA3 region. Repeated electroacupuncture intervention had a cumulative analgesic effect on injury-induced neuropathic pain reactions, and it led to synaptic remodeling of hippocampal neurons and upregulated calcium/calmodulin-dependent protein kinase II expression in the hippocampal CA3 region.

journal_name

Neural Regen Res

authors

Xu Q,Liu T,Chen S,Gao Y,Wang J,Qiao L,Liu J

doi

10.3969/j.issn.1673-5374.2012.18.003

subject

Has Abstract

pub_date

2012-06-25 00:00:00

pages

1378-85

issue

18

eissn

1673-5374

issn

1876-7958

pii

NRR-7-1378

journal_volume

7

pub_type

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