[Electroacupuncture protects the brain against acute ischemic injury via up-regulation of delta-opioid receptor in rats].
OBJECTIVE
To explore the effect of delta-opioid receptor (DOR) in electroacupuncture (EA) protecting the brain against acute ischemic injury.


METHODS
Fifty-one rats were randomly divided into sham ischemia group, ischemia group, sham EA group, EA group, and EA+DOR antagonist (naltrindole) group. Transient focal cerebral ischemia (1 hour) was induced in rat brain by middle cerebral artery occlusion (MCAO) method. EA was applied on Shuigou (GV 26) and Neiguan (PC 6) for 30 min, starting immediately after the onset of reperfusion. Neurological deficit scores and volume of cerebral infarction were detected after 24-hour reperfusion. Other 12 rats were randomly divided into sham ischemia group, ischemia group, EA group and EA + naltrindole group. DOR protein expressions were assessed by Western blotting after 24-hour reperfusion.


RESULTS
In comparison with the ischemia group and sham EA group, EA significantly reduced ischemic infarction and neurological deficits (P<0.05); EA significantly increased the expression of 60 kD DOR protein (P<0.05) and tended to increase that of 36 kD DOR protein (P>0.05). When naltrindole was combined with EA, the naltrindole completely abolished the EA-induced protection in ischemic infarction and neurological deficits, and also arrested the expression of DOR.


CONCLUSIONS
EA can up-regulate DOR expression and protect the brain from ischemia-reperfusion injury.
Tian
Xue-song
XS
National Key Laboratory of Medical Neurobiology, Department of Integrative Medicine, Shanghai Medical College, Fudan University, Shanghai 200032, China.
Zhou
Fei
F
Yang
Ru
R
Xia
Ying
Y
Wu
Gen-chen
GC
Guo
Jing-chun
JC
D000818:Animals; D015671:Electroacupuncture; D020244:Infarction, Middle Cerebral Artery / Q000628:therapy*; D008297:Male; D011897:Random Allocation; D051381:Rats; D017207:Rats, Sprague-Dawley; D017465:Receptors, Opioid, delta / Q000378:metabolism*; D015427:Reperfusion Injury / Q000517:prevention & control*; D015854:Up-Regulation
D017465:Receptors, Opioid, delta