Animals were individually placed in the central platform facing an open arm and observed for 5 min. Two observers blinded to treatments recorded the number of entries

and the time spent in the open arms as measurements of anxiety-related behavior (Walf and Frye, 2007). Rats (60-day old) were placed on a 5.0 cm-high, 8.0 cm-wide platform located in the left side of a 50 cm × 25 cm × 25 cm inhibitory avoidance task apparatus, with floor composed by a series of parallel bronze bars 1.0 cm apart. In the training session, the latency to step down from the platform to the grid with all four paws was measured; immediately after stepping down onto the grid animals received a 0.4 mA, 1.0-s scrambled foot shock. The test session was performed 1.5 h (short-term

memory) and 24 h (long-term memory) after training and procedures were the same, except that the foot shock HDAC inhibitor was omitted. Differences between training and test latencies to step down were taken as an index of memory. For glutamate uptake, western blot data and immunohistochemistry, the results were expressed as mean ± standard deviation, and statistical analysis was performed by one-way ANOVA followed by Tukey’s test as post-hoc. For elevated plus maze task, the results were expressed as mean ± standard deviation and the Student’s t test was applied. For inhibitory avoidance click here task, the results were expressed as median ± interquartile for range and Wilcoxon test was used for analysis within groups. For statistical significance, the value of P < 0.05 was adopted. The statistical analysis was performed using SPSS 15.0 software. Fig.

1 shows that the glutamate uptake by hippocampal slices obtained 12 h after kainate-induced seizures showed a trend to be higher (P = 0.082), and those obtained 24 h after seizures decreased 20%, when compared to control group. Glutamate uptake by hippocampal slices was not affected by seizures after 48 h. The immunocontent of astrocytic glutamate transporters (GLAST and GLT-1) and of neuronal glutamate transporter (EAAC1) was determined in the whole hippocampus obtained 12, 24, 48, 72 h and 60 days after seizures ( Fig. 2). GLT-1 increased (37%) in hippocampi obtained 12 h after the seizures period, followed by a decrease (20%) at 24 h ( Fig. 2A). GLT-1 showed no alterations after 48 h. The immunocontent of GLAST increased around 2 fold in hippocampi obtained from KA group only up to 48 h after seizures ( Fig. 2B). The immunocontent of the neuronal EAAC1 glutamate transporter was not affected by KA-induced ( Fig. 2C). We next investigated the long-term modifications of the density of glutamate transporters in the hippocampus; in 60-day-old rats the GLT-1 and GLAST immunocontent increased, and the EAAC1 immunocontent decreased, compared with younger animals.