مجله علمی پژوهشی دانشگاه علوم پزشکی شهید صدوقی یزد
سال:1395 | دوره:24 | شماره:7 |تعداد مقالات:11

Introduction: Alzheimer’s disease is one of the most prevalent brain neurodegenerative diseases and the most common cognitive deficits are memory dysfunction and spatial perception impairment. Progesterone has a neorostroid action in hippocampal neurogenesis, synaptic stability and spatial learning and memory and has antioxidant effect. Since oxidative stress is involved in the pathogenesis of Alzheimer's disease, and conflicting results were reported about the effects of progesterone on therefore in Alzheimer’s, the present study investigated the effect of microinjection of three doses of progesterone on the process of spatial memory and lipid peroxidation and total peroxidation in the hippocampus in the experimental model of AD.Methods: 42 adult male Wistar rats weighting 250±50 g were randomly divided into six main groups (n=7): control group, sham group, Alzheimer’s model (intracerebroventricular injection of streptozotocin), Alzheimer model+progesterone (0.5, 1.5, 2µg/kg). 2 weeks after injection of streptozotocin (3 mg/kg), Alzheimer's was induced then progesterone injected in different doses. After termination of behavioral testing days, the hippocampus was removed to measure the levels of oxidative stress parameter to measure levels of oxidative stress parameters. Statistical analysis was performed using analysis of variance (ANOVA).Results: Results showed that intraventricular injection of STZ decreased spatial memory in comparison to control group (P<0.001). Administration progesterone significantly improved spatial memory in experimental models of Alzheimer's rats (P<0.001). MDA and SOD in all doses of progesterone showed a significant reduction compared to the AD animals (P<0.001).Conclusion: Progesterone can prevent a decrease in spatial learning and memory by reducing oxidative stress in the hippocampus of rats with Alzheimer's.

Introduction: Epilepsy is one of the most common neurological disorders that affect on many aspects of people's lives. Multiple treatment methods were used for epileptic patients. Recently, treatment effects of medicinal plants on epilepsy have been investigated. In attention to components of Origanum vulgare and the usage of it in traditional medicine as an anti- convulsion herb, this study was carried out to assess the anti- convulsive effects of Origanumvulgare extract on chemical kindling model of epilepsy.Methods: The present experimental study has been carried out on 40 male mice that they have been chosen randomly and divided into 5 equal experimental groups, including one control group received only Pentylenetetrazole (PTZ), one sham group received distilled water and three experimental groups that 30 minutes before PTZ injection received equeous extract of Origanumvulgare in doses of 400, 600 and 800 mg/kg of body weight via gavage tube. Chemical kindling was performed on all of them for 12 times intraperitoneal injection of 45 mg/kg of body weight of PTZ at every 48 hours. Data analyses were carried out by one way ANOVA and Tukey post- hoc test.Results: Data analysis showed that administration of Origanum vulgare extract has a significant effect on chemical kindling. It decreased the progress of seizure stages significantly (P˂0.05) and increased latency time for onset of seizure considerably (P˂0.05), but it had no significant effect on seizure duration.Conclusion: The results obtained from the present study showed aqueous extract of Origanum vulgare plant had anti convulsant effect on chemical kindling. Thus, it may be useful for epilepsy treatment.