Sunday, September 15, 2013
hence the ability of the drug to penetrate into granulomas and the half-life of
It would appear that increases in EAAC1 protein levels are observed enzalutamide in both individuals with epilepsy or in animal types of epilepsy, however two groups have observed no differences. Even though mice genetically deleted of EAAC1 do not seem to express any overt behavioral symptoms of seizures, chronic intraventricular administration of oligonucleotides that knock down expression of EAAC1 cause a seizure phenotype that initially requires facial twitches and snowy but progresses to tonic forepaw extension and clonic seizures. The consequence of DHPG on EAAC1 protein levels were three to five fold greater in animals after SE than in sham controls. We don't think that this is due to a generalized increase in translation nor to an increase in DHPG mediated signaling for many different reasons.
First, the effects of DHPG on complete protein levels were identical in both groups of animals. Second, the effects of DHPG on GluR2/3 levels were not somewhat different in the two categories of animals. Finally, the DHPG induced increases in the levels of phospho eIF 4E were comparable in both groups of animals. In fact, the levels of EAAC1 mRNA increase to a better extent in both a cell Lymph node body portion and in synaptoneurosomes than do the levels of other dendritically focused mRNAs, including calmodulin kinase II and GluR2. Consequently, the easiest explanation is that seizures improve EAAC1 mRNA and this supports increased capacity for licensed translation.
Given that seizures are associated with an increase in extra-cellular glutamate in microdialysis studies and that mGluR1 or mGluR5 antagonists attenuate pilocarpine induced seizures and cell death, it seems highly likely that these receptors are activated during seizures. The truth is, it is significantly Evacetrapib surprising that seizures didn't seem to substantially improve EAAC1 protein levels in stratum radiatum of hippocampus. At this time, it is not obvious why EAAC1 protein levels don't increase in this region. It's possible that export and licensed interpretation takes longer compared to 3h found in the current study, this was not examined. It's also possible that the structure of mGluR activation that does occur in seizures may be different than that observed with DHPG in synaptoneurosomes, continuous activation of the group I mGluRs may have to encourage translation as big as that observed by western blot in current study. It'll be interesting to determine if a non carried, group I mGluR agonist increases translation of EAAC1 in vivo. We did attempt to determine if the DHPG induced increases in EAAC1 were associated with increases in dependent glutamate transportation in synaptoneurosomes, but did not find a huge difference also using dihydrokainate to selectively block GLT 1.
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