RÉSUMÉ
Objective To observe the effects of estrogen on behavior and 5-HT in periaqueductal gray (PAG)in migraine model rats. Methods Tewnty-four ovariectomized Wistar rats were divided randomly into four groups:control group (Group A),migraine group(Group B),low dose estradiol-treated ovariectomized group(Group C),high dose etradiol-treated ovariectomized group(Group D).After 1 week,the rats in Group B,C and D were injected with nitroglycerine 10 mg?kg-1 subcutaneously to make migraine rat models,the rats in Group A were given peanut oil alike,and the behavior changes were observed.2 h after injection,the rats were killed and the midbrains were separated and then 5-HT immunohistochemical staining was performed.Results Behavior: compared with Group B,the degrees of red-calws,red-ears and red-tail rats in Group D relieved obviously,the times of climbing hutch and scratching head were much fewer,while the rats in group C showed no significant difference;Immunohistochemical staining:compared with Group A,the 5-HT-positive neurons expression in PAG of Group B and C were more obviously(P