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Alves SS, de Oliveira JAC, Lazarini-Lopes W, Servilha-Menezes G, Grigório-de-Sant'Ana M, Del Vecchio F, Mazzei RF, Sousa Almeida S, da Silva Junior RMP, Garcia-Cairasco N. Audiogenic Seizures in the Streptozotocin-Induced Rat Alzheimer's Disease Model. J Alzheimers Dis 2023:JAD230153. [PMID: 37393501 DOI: 10.3233/jad-230153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/03/2023]
Abstract
BACKGROUND Alzheimer's disease (AD) is a neurodegenerative and progressive disorder with no cure and constant failures in clinical trials. The main AD hallmarks are amyloid-β (Aβ) plaques, neurofibrillary tangles, and neurodegeneration. However, many other events have been implicated in AD pathogenesis. Epilepsy is a common comorbidity of AD and there is important evidence indicating a bidirectional link between these two disorders. Some studies suggest that disturbed insulin signaling might play an important role in this connection. OBJECTIVE To understand the effects of neuronal insulin resistance in the AD-epilepsy link. METHODS We submitted the streptozotocin (STZ) induced rat AD Model (icv-STZ AD) to an acute acoustic stimulus (AS), a known trigger of seizures. We also assessed animals' performance in the memory test, the Morris water maze and the neuronal activity (c-Fos protein) induced by a single audiogenic seizure in regions that express high levels of insulin receptors. RESULTS We identified significant memory impairment and seizures in 71.43% of all icv-STZ/AS rats, in contrast to 22.22% of the vehicle group. After seizures, icv-STZ/AS rats presented higher number of c-Fos immunopositive cells in hippocampal, cortical, and hypothalamic regions. CONCLUSION STZ may facilitate seizure generation and propagation by impairment of neuronal function, especially in regions that express high levels of insulin receptors. The data presented here indicate that the icv-STZ AD model might have implications not only for AD, but also for epilepsy. Finally, impaired insulin signaling might be one of the mechanisms by which AD presents a bidirectional connection to epilepsy.
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Affiliation(s)
- Suélen Santos Alves
- Department of Neurosciences and Behavioral Sciences, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), São Paulo, Brazil
| | | | - Willian Lazarini-Lopes
- Department of Pharmacology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), São Paulo, Brazil
| | - Gabriel Servilha-Menezes
- Department of Physiology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), São Paulo, Brazil
| | | | - Flavio Del Vecchio
- Department of Physiology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), São Paulo, Brazil
| | - Rodrigo Focosi Mazzei
- Department of Psychology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto - University of São Paulo (FFCLRP-USP), São Paulo, Brazil
| | - Sebastião Sousa Almeida
- Department of Psychology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto - University of São Paulo (FFCLRP-USP), São Paulo, Brazil
| | | | - Norberto Garcia-Cairasco
- Department of Neurosciences and Behavioral Sciences, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), São Paulo, Brazil
- Department of Physiology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), São Paulo, Brazil
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Alves SS, da Silva Junior RMP, Delfino-Pereira P, Pereira MGAG, Vasconcelos I, Schwaemmle H, Mazzei RF, Carlos ML, Espreafico EM, Tedesco AC, Sebollela A, Almeida SS, de Oliveira JAC, Garcia-Cairasco N. A Genetic Model of Epilepsy with a Partial Alzheimer's Disease-Like Phenotype and Central Insulin Resistance. Mol Neurobiol 2022; 59:3721-3737. [PMID: 35378696 DOI: 10.1007/s12035-022-02810-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 03/22/2022] [Indexed: 12/20/2022]
Abstract
Studies have suggested an important connection between epilepsy and Alzheimer's disease (AD), mostly due to the high number of patients diagnosed with AD who develop epileptic seizures later on. However, this link is not well understood. Previous studies from our group have identified memory impairment and metabolic abnormalities in the Wistar audiogenic rat (WAR) strain, a genetic model of epilepsy. Our goal was to investigate AD behavioral and molecular alterations, including brain insulin resistance, in naïve (seizure-free) animals of the WAR strain. We used the Morris water maze (MWM) test to evaluate spatial learning and memory performance and hippocampal tissue to verify possible molecular and immunohistochemical alterations. WARs presented worse performance in the MWM test (p < 0.0001), higher levels of hyperphosphorylated tau (S396) (p < 0.0001) and phosphorylated glycogen synthase kinase 3 (S21/9) (p < 0.05), and lower insulin receptor levels (p < 0.05). Conversely, WARs and Wistar controls present progressive increase in amyloid fibrils (p < 0.0001) and low levels of soluble amyloid-β. Interestingly, the detected alterations were age-dependent, reaching larger differences in aged than in young adult animals. In summary, the present study provides evidence of a partial AD-like phenotype, including altered regulation of insulin signaling, in a genetic model of epilepsy. Together, these data contribute to the understanding of the connection between epilepsy and AD as comorbidities. Moreover, since both tau hyperphosphorylation and altered insulin signaling have already been reported in epilepsy and AD, these two events should be considered as important components in the interconnection between epilepsy and AD pathogenesis and, therefore, potential therapeutic targets in this field.
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Affiliation(s)
- Suélen Santos Alves
- Department of Neurosciences and Behavioral Sciences, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil
| | | | - Polianna Delfino-Pereira
- Department of Neurosciences and Behavioral Sciences, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil
| | | | - Israel Vasconcelos
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil
| | - Hanna Schwaemmle
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil
| | - Rodrigo Focosi Mazzei
- Department of Psychology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo (FFCLRP-USP), Ribeirao Preto, Brazil
| | - Maiko Luiz Carlos
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo (FFCLRP-USP), Ribeirao Preto, Brazil
| | - Enilza Maria Espreafico
- Department of Cell and Molecular Biology and Pathogenic Bioagents, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil
| | - Antônio Claudio Tedesco
- Department of Chemistry, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo (FFCLRP-USP), Ribeirao Preto, Brazil
| | - Adriano Sebollela
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil
| | - Sebastião Sousa Almeida
- Department of Psychology, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, University of São Paulo (FFCLRP-USP), Ribeirao Preto, Brazil
| | - José Antônio Cortes de Oliveira
- Department of Physiology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Av. Dos Bandeirantes 3900, Ribeirao Preto, SP, 14049-900, Brazil
| | - Norberto Garcia-Cairasco
- Department of Neurosciences and Behavioral Sciences, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Ribeirao Preto, Brazil.
- Department of Physiology, Ribeirão Preto Medical School - University of São Paulo (FMRP-USP), Av. Dos Bandeirantes 3900, Ribeirao Preto, SP, 14049-900, Brazil.
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Mazzei RF, Batista CL, Antonelli-Ponti M, Fukusima SS, Silva JAD. Cognitive Abilities, Debt, Roads and their Impact on Deaths in Traffic in Brazil. Psic : Teor e Pesq 2021. [DOI: 10.1590/0102.3772e3755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Abstract Deaths in traffic represent a global and multicausal problem. We verified, through a linear regression model, that cognitive abilities (CA) and population indebtedness (PI) predict, together, 56% of the variation of death rates in the traffic (DT) of the twenty-seven states of Brazil. CA’s are related to a greater control of the attention and, possibly, to a greater compliance with norms for preventing traffic accidents, has a greater impact than PI on DT, since PI associates to only one deficit of people's attention resources. The decrease of PI and the improvement of CA can decrease DT.
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