Objective To studay the adverse effect of cypermethrine(CP)on sex hormones level in the serum in female rats. Methods Fifty female SD rats(90-110g)were randomly divided into 5 groups,negative control(earthnut oil),3 CP treatment groups(20,40 and 80mg/kg body)and positive control(E_2:100?g/kg body).A 28-day oral test was performed according to the procedure recommended by OECD.Results Compared with the negative group,the level of FSH,LH and P in the serum of rats significantly decreased with the increase of cypermethrine dose(P

AIM: To explore the neuroprotective action of progesterone(PROG), which has been proved to be a "neuroactive steroid". METHODS: The model of focal cerebral ischemia was established in rats by reverserble inserting a nylon thread with a diameter of 0.2 mm into the anterior cerebral artery through the internal carotid artery. The effect of PROG was assessed by determining water,sodium, potassium, and calcium contents in striatum of rats subjected to 2 h ischemia followed by 22 h reperfusion. RESULTS: The water,sodium,and calcium contents of middle cerebral artery occlusion(MCAO) striatum were obviously higher,the potassium content was obviously lower than those of non-MCAO striatum in I/R and DMSO groups,but there was no significant difference between these two groups.Compared with the result in I/R and DMSO groups , water, sodium and calcium contents significantly decreased, but potassium(P0.05). CONCLUSION: Treatment with PROG can significantly reduce the striatal injury of rats with cerebral ischmia-reperfusion.