N performed either 40 minutes or 24 h later, to evaluate STM or LTM respectively. The number of crossings were significantly lower in the second session only for those animals which were exposed for 5 minutes in the first session (* p,0.05, at 40 minutes; *** p,0.001 at 24 h; Mann-Whitney test) (Figure 1B). The total number of crossings for rats exposed for just 1 Doramapimod Doramapimod web minute to the OF did not show any significant decrease when evaluated either 40 minutes or 24 h later (Figure 1B). These results showed that a 5 minutes OF session led to both STM and LTM formation and expression, while a 1 minute session did not. Then, WB analysis of NMDAR subunits was carried out in hippocampal protein extracts of those rats exposed only once to the OF for 5 minutes (Figure 1C) and sacrificed at three different times: immediately after the OF session (59?9), 30 minutes (59?309) or 70 minutes (59?09) later (Figure 1C). WB analysis was also carried out in a fourth group corresponding to rats exposed once to the OF for 1 minute and sacrificed 70 minutes later (19?09).Figure 1. NMDAR subunits changes after OF habituation. A. Habituation to the OF of rats exposed to a 5 minutes OF session (n = 16). Graphs show number of crossings (left panel) and rearingsNMDAR Subunits Change after OF Exposure and LTP(right panel) per minute (bars indicates median with interquartile ranges). Crossings decreased significantly after 3 minutes, while rearings were only significantly decreased in the fifth minute. *** p,0.0001, ** p,0.01 by Friedman test followed by Dunn’s Multiple Comparison Test. B. Total crossings from rats exposed to the OF for 1 or 5 minutes (Training) and tested for STM 40 minutes later (n = 12) or LTM 24 h later (n = 16). There were significant differences in total number of crossings in the second session compared to the first, only in rats which spent 5 minutes in the OF in the training session, for STM (* p,0.05) as well as for LTM (*** p,0.0001) (Mann Whitney test). C. NMDAR subunits in the hippocampus of rats after OF exposure. Four groups of rats were analyzed: rats as in A, which were sacrificed at 0, 30 and 70 minutes after the task (59-09, 59?09 and 59?09 groups); and rats exposed for 1 minute to the OF, sacrificed 70 minutes later (19?09 group). WB analysis showed about a one fold increase in GluN1 and GluN2A level for 59?09 group, in 3 independent experiments (* p,0.05, ONE WAY ANOVA, Newman-Keuls Multiple Comparison Post-Test). Insert on top: representative WB bands for GluN1, GluN2A and GluN2B NMDAR subunits and GAPDH (internal control). D. NMDAR subunits analysis in the hippocampus of rats after two OF sessions. 4 groups of rats were analyzed: rats exposed to the OF 5 minutes and sacrificed immediately (59-09), 70 minutes (59?09), 24 h later (59?4 h), or tested in the OF and sacrificed 70 minutes later (709 postest-TE). * p,0.05 ONE WAY ANOVA, Dunnett’s Post-Test. Insert on top: representative WB bands for GluN1 and GluN2A NMDAR subunits and GAPDH (internal control). doi:10.1371/journal.pone.0055244.gBoth GluN1 and GluN2A protein levels were significantly higher (about two fold) 70 minutes after 5 minutes in the OF (59?709), compared to 59-09, 59?09 and 19?09 groups, while GluN2B level did not show any significant modification (Figure 1C). There were not significant differences in NMDAR subunits between 5909 and 19?09 groups. This result showing that there were no changes in the subunits of rats exposed only 1 minute to the OF (19?09), suggests t.N performed either 40 minutes or 24 h later, to evaluate STM or LTM respectively. The number of crossings were significantly lower in the second session only for those animals which were exposed for 5 minutes in the first session (* p,0.05, at 40 minutes; *** p,0.001 at 24 h; Mann-Whitney test) (Figure 1B). The total number of crossings for rats exposed for just 1 minute to the OF did not show any significant decrease when evaluated either 40 minutes or 24 h later (Figure 1B). These results showed that a 5 minutes OF session led to both STM and LTM formation and expression, while a 1 minute session did not. Then, WB analysis of NMDAR subunits was carried out in hippocampal protein extracts of those rats exposed only once to the OF for 5 minutes (Figure 1C) and sacrificed at three different times: immediately after the OF session (59?9), 30 minutes (59?309) or 70 minutes (59?09) later (Figure 1C). WB analysis was also carried out in a fourth group corresponding to rats exposed once to the OF for 1 minute and sacrificed 70 minutes later (19?09).Figure 1. NMDAR subunits changes after OF habituation. A. Habituation to the OF of rats exposed to a 5 minutes OF session (n = 16). Graphs show number of crossings (left panel) and rearingsNMDAR Subunits Change after OF Exposure and LTP(right panel) per minute (bars indicates median with interquartile ranges). Crossings decreased significantly after 3 minutes, while rearings were only significantly decreased in the fifth minute. *** p,0.0001, ** p,0.01 by Friedman test followed by Dunn’s Multiple Comparison Test. B. Total crossings from rats exposed to the OF for 1 or 5 minutes (Training) and tested for STM 40 minutes later (n = 12) or LTM 24 h later (n = 16). There were significant differences in total number of crossings in the second session compared to the first, only in rats which spent 5 minutes in the OF in the training session, for STM (* p,0.05) as well as for LTM (*** p,0.0001) (Mann Whitney test). C. NMDAR subunits in the hippocampus of rats after OF exposure. Four groups of rats were analyzed: rats as in A, which were sacrificed at 0, 30 and 70 minutes after the task (59-09, 59?09 and 59?09 groups); and rats exposed for 1 minute to the OF, sacrificed 70 minutes later (19?09 group). WB analysis showed about a one fold increase in GluN1 and GluN2A level for 59?09 group, in 3 independent experiments (* p,0.05, ONE WAY ANOVA, Newman-Keuls Multiple Comparison Post-Test). Insert on top: representative WB bands for GluN1, GluN2A and GluN2B NMDAR subunits and GAPDH (internal control). D. NMDAR subunits analysis in the hippocampus of rats after two OF sessions. 4 groups of rats were analyzed: rats exposed to the OF 5 minutes and sacrificed immediately (59-09), 70 minutes (59?09), 24 h later (59?4 h), or tested in the OF and sacrificed 70 minutes later (709 postest-TE). * p,0.05 ONE WAY ANOVA, Dunnett’s Post-Test. Insert on top: representative WB bands for GluN1 and GluN2A NMDAR subunits and GAPDH (internal control). doi:10.1371/journal.pone.0055244.gBoth GluN1 and GluN2A protein levels were significantly higher (about two fold) 70 minutes after 5 minutes in the OF (59?709), compared to 59-09, 59?09 and 19?09 groups, while GluN2B level did not show any significant modification (Figure 1C). There were not significant differences in NMDAR subunits between 5909 and 19?09 groups. This result showing that there were no changes in the subunits of rats exposed only 1 minute to the OF (19?09), suggests t.
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