Paper Information

Journal:   IRANIAN JOURNAL OF PHARMACEUTICAL RESEARCH (IJPR)   2014 , Volume 13 , Number 3; Page(s) 987 To 993.
 
Paper: 

A POSSIBLE NON-GENOMIC EPILEPTOGENIC PROPERTIES OF ESTRADIOL ATTENUATED BY MK801 AND DNQX IN AMYGDALA KINDLED RATS

 
 
Author(s):  SABERI MEHDI*, SABERI FATEMEH, VESALI MAHMOUD ROSHANAK
 
* DEPARTMENT OF PHARMACOLOGY AND TOXICOLOGY, APPLIED NEUROSCIENCE RESEARCH CENTER, FACULTY OF MEDICINE, BAQIYATALLAH UNIVERSITY OF MEDICAL SCIENCES, TEHRAN, IRAN
 
Abstract: 

Although the epileptogenic properties of estrogens have been widely demonstrated in several models and species, the mechanism (s) by which estrogens can acutely change seizure parameters including after discharge and seizure durationremains to be determined. In the present study, we examined the role of NMDA (N-methyl-D-aspartate), non-NMDA andestrogen receptors in estradiol benzoate (EB) effects on kindled seizure parameters.
Different groups of fully kindled male rats received either EB (30
mg /Kg); EB plus MK801 (2 mg/Kg, as NMDA antagonist); DNQX (7.5 mg/Kg); tamoxifen (TAM, 0.1 mg/Kg, as non- NMDA antagonist) or intra-amygdala injection of anisomycine (30 mmol/mL, a protein synthesis inhibitor). Kindled seizure parameters including after discharge duration (ADD) and stage 5 duration (S5D) were determined at 0.25 and 3 h post sesame oil (EB solvent) or EB treatment.
While pretreatment with either MK801 or DNQX could block the ADD prolongation induced by EB at 0.25 h, they had no effect on S5D prolongation at 3 h. Moreover, application of anisomycine or TAM had no effect on estradiol induced ADD and S5D prolongation. These results indicate that both NMDA and non-NMDA receptors could be involved in EB induced ADD prolongation. The observed short termnon-estrogenic receptor or protein synthesis dependent effects of EB may provide a non-genomic mechanism for the stimulatory effects of the steroid on seizure activity.

 
Keyword(s): MALE RATS, AMYGDALAKINDLING, SEIZURE, ESTRADIOL BENZOATE, MK801, DNQX
 
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