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Rezende GHS, Guidine PAM, Medeiros DDC, Moraes-Santos T, Mello LE, Moraes MFD. Protein-caloric dietary restriction inhibits mossy fiber sprouting in the pilocarpine model of TLE without significantly altering seizure phenotype. Epilepsy Res 2015; 117:85-9. [PMID: 26432758 DOI: 10.1016/j.eplepsyres.2015.08.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 02/18/2015] [Accepted: 08/12/2015] [Indexed: 10/23/2022]
Abstract
Given the known effects of undernutrition over protein synthesis, we promoted neonatal undernutrition to evaluate its effect over the neuroplasticity induced by the pilocarpine model of epilepsy and also over spontaneous seizure expression. A well-nourished group (WN), fed ad libitum rat chow diet, and an undernourished group (UN), fed 60% of the amount of diet consumed by a WN group, were submitted to status epilepticus (SE) through pilocarpine injection at 45 days of age. Thereafter, animals were behaviorally monitored for 6h daily to quantify seizures. On the 120th day, electroencephalography (EEG) was recorded and rats were sacrificed to measure proteins and glutamate release from hippocampus. Neo-Timm staining was used to detect mossy fiber sprouting. The results indicate no statistical difference in the latency for the first spontaneous recurrent seizure (SRS), in the number of daily SRS, or in EEG epileptiform activity duration between groups. However, PILO promoted more K(+)-stimulated glutamate release in the hippocampus slices from WN animals when compared to the UN group. It was also found a lower degree of mossy fibers sprouting in UN group. Data from this work, thus, indicate that the decreased neuroplasticity as currently measured does not directly impact on the manifestation of spontaneous seizures.
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Affiliation(s)
- Gustavo Henrique Souza Rezende
- Núcleo de Neurociências (NNC), Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais CEP 31270-901, Brasil; Centro de Tecnologia e Pesquisa em Magneto-Ressonância, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, CEP 31270-901, Brasil
| | - Patrícia Alves Maia Guidine
- Núcleo de Neurociências (NNC), Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais CEP 31270-901, Brasil; Centro de Tecnologia e Pesquisa em Magneto-Ressonância, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, CEP 31270-901, Brasil
| | - Daniel de Castro Medeiros
- Núcleo de Neurociências (NNC), Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais CEP 31270-901, Brasil; Centro de Tecnologia e Pesquisa em Magneto-Ressonância, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, CEP 31270-901, Brasil
| | - Tasso Moraes-Santos
- Centro de Tecnologia e Pesquisa em Magneto-Ressonância, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, CEP 31270-901, Brasil
| | - Luiz Eugênio Mello
- Departamento de Fisiologia, Universidade Federal de São Paulo, Rua Botucatu 862, 04023-062, São Paulo, São Paulo, Brazil
| | - Márcio Flávio Dutra Moraes
- Núcleo de Neurociências (NNC), Departamento de Fisiologia e Biofísica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais CEP 31270-901, Brasil; Centro de Tecnologia e Pesquisa em Magneto-Ressonância, Escola de Engenharia, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, CEP 31270-901, Brasil.
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Time-dependent changes in learning ability and induction of long-term potentiation in the lithium-pilocarpine-induced epileptic mouse model. Epilepsy Behav 2010; 17:448-54. [PMID: 20332069 DOI: 10.1016/j.yebeh.2010.02.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 02/12/2010] [Accepted: 02/13/2010] [Indexed: 11/23/2022]
Abstract
To explore the mechanism underlying the development of learning deficits in patients with epilepsy, we generated a mouse model for temporal lobe epilepsy by intraperitoneally injecting mice with pilocarpine with lithium chloride, and investigated time-dependent changes in both contextual fear memory of those model mice and long-term potentiation (LTP) in hippocampal CA1 neurons 1 day, 2 weeks, and 6 weeks after the onset of status epilepticus (SE). Fear memory formation did not change 1 day and 2 weeks after the onset of SE, but was significantly reduced after 6 weeks. Induction of LTP was enhanced 1 day after the onset of SE, but returned to the normal level 2 weeks later, and was almost completely attenuated after 6 weeks. The enhancement of LTP was accompanied by an increase in output responses of excitatory postsynaptic potentials, whereas suppression of LTP was accompanied by alteration of the ratio of paired pulse facilitation. These results indicate that time-dependent changes of LTP induction have a causal role in the development of learning deficits of epilepsy patients.
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Queiroz C, Mello L. Protein tyrosine kinase inhibitors modify kainic acid-induced epileptiform activity and mossy fiber sprouting but do not protect against limbic cell death. Braz J Med Biol Res 2008; 41:403-10. [DOI: 10.1590/s0100-879x2008000500009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2007] [Accepted: 05/05/2008] [Indexed: 11/21/2022] Open
Affiliation(s)
| | - L.E. Mello
- Universidade Federal de São Paulo, Brasil
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