Objective To explore the possible mechanism of GABA B receptor subunit and epileptogenesis in absence seizure animal model Methods AY 9944 absence seizure model is developed by abdomenal injection of a cholesterol biosynthesis inhibitor Ay 9944 to neonatal Lon Evan hooded rats In situ hybridization is applied to detect GABA B receptor subunit GBR1b pan mRNA in rat brain of absence seizure Result There is increased hybridization signal in cortex, hippocampus and thalamus, especially in cortex (361?48 nCi/g) and hippocampus CA1 region (327?83 nCi/g)( P value 0 020 and 0 027 respectively) Conclusion The result of this study support the hypothesis that GABA B receptor subunit may be involved and induce seizures in absence epilepsy The finding of subunit change may direct the screen of new antiepileptic drug This finding deserves further study

Objective To investigate the gene expression pattern of metabotropic glutamate receptor- Ⅰ ( mGluR-Ⅰ ), D-p-hydroxyphenylglycine (DHPG) -induced rat hippocampal slice epileptic seizure model. Methods In vitro rat hippocampal sclice was continously perfused with artificial cerebrospinal fluid containing 50 μmol DHPG, and epileptic seizure model was established (DHPG group, n = 3). cDNA microarray chip was applied to explore the gene expression pattern in DHPG group, the differentially expressed genes were screened in comparison with control group ( n = 3), and functional classification analysis was conducted. Results There were 206 up-regulated genes and 489 down-regulated genes, among which 67 up-regulated genes and 86 down-regulated genes differentially expressed by 1.5 fold, 6 up-regulated genes differentially expressed by more than 2.0 folds, and 25 down-regulated genes differentially expressed by less than 0.5 fold. Functional classification analysis revealed that differentially expressed gene function involved in protein binding (19 genes), molecular function, calcium ion binding and nucleotide binding. Conclusion Epileptic seizure and roles of mGluR-Ⅰ agonist may be related to various genes, which is a complicated process. This experiment provides evidences for further researches.