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| Content Provider | PubMed Central |
|---|---|
| Author | Mazzuferi, Manuela Palma, Eleonora Martinello, Katiuscia Francesca, Maiolino Cristina, Roseti Fucile, Sergio Fabene, Paolo F. Schio, Federica Pellitteri, Michele Sperk, Guenther Miledi, Ricardo Eusebi, Fabrizio Michele, Simonato |
| Abstract | Refractory temporal lobe epilepsy (TLE) is associated with a dysfunction of inhibitory signaling mediated by GABAA receptors. In particular, the use-dependent decrease (run-down) of the currents (IGABA) evoked by the repetitive activation of GABAA receptors is markedly enhanced in hippocampal and cortical neurons of TLE patients. Understanding the role of IGABA run-down in the disease, and its mechanisms, may allow development of medical alternatives to surgical resection, but such mechanistic insights are difficult to pursue in surgical human tissue. Therefore, we have used an animal model (pilocarpine-treated rats) to identify when and where the increase in IGABA run-down occurs in the natural history of epilepsy. We found: (i) that the increased run-down occurs in the hippocampus at the time of the first spontaneous seizure (i.e., when the diagnosis of epilepsy is made), and then extends to the neocortex and remains constant in the course of the disease; (ii) that the phenomenon is strictly correlated with the occurrence of spontaneous seizures, because it is not observed in animals that do not become epileptic. Furthermore, initial exploration of the molecular mechanism disclosed a relative increase in α4-, relative to α1-containing GABAA receptors, occurring at the same time when the increased run-down appears, suggesting that alterations in the molecular composition of the GABA receptors may be responsible for the occurrence of the increased run-down. These observations disclose research opportunities in the field of epileptogenesis that may lead to a better understanding of the mechanism whereby a previously normal tissue becomes epileptic. |
| Related Links | http://dx.doi.org/10.1073/pnas.0914710107 |
| Ending Page | 3185 |
| Page Count | 6 |
| Starting Page | 3180 |
| File Format | |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 107 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2010-02-16 |
| Access Restriction | Open |
| Rights Holder | National Academy of Sciences |
| Subject Keyword | General Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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