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Ribeiro R, Silva EG, Moreira FC, Gomes GF, Cussat GR, Silva BSR, da Silva MCM, de Barros Fernandes H, de Sena Oliveira C, de Oliveira Guarnieri L, Lopes V, Ferreira CN, de Faria AMC, Maioli TU, Ribeiro FM, de Miranda AS, Moraes GSP, de Oliveira ACP, Vieira LB. Chronic hyperpalatable diet induces impairment of hippocampal-dependent memories and alters glutamatergic and fractalkine axis signaling. Sci Rep 2023; 13:16358. [PMID: 37773430 PMCID: PMC10541447 DOI: 10.1038/s41598-023-42955-9] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 09/16/2023] [Indexed: 10/01/2023] Open
Abstract
Chronic consumption of hyperpalatable and hypercaloric foods has been pointed out as a factor associated with cognitive decline and memory impairment in obesity. In this context, the integration between peripheral and central inflammation may play a significant role in the negative effects of an obesogenic environment on memory. However, little is known about how obesity-related peripheral inflammation affects specific neurotransmission systems involved with memory regulation. Here, we test the hypothesis that chronic exposure to a highly palatable diet may cause neuroinflammation, glutamatergic dysfunction, and memory impairment. For that, we exposed C57BL/6J mice to a high sugar and butter diet (HSB) for 12 weeks, and we investigated its effects on behavior, glial reactivity, blood-brain barrier permeability, pro-inflammatory features, glutamatergic alterations, plasticity, and fractalkine-CX3CR1 axis. Our results revealed that HSB diet induced a decrease in memory reconsolidation and extinction, as well as an increase in hippocampal glutamate levels. Although our data indicated a peripheral pro-inflammatory profile, we did not observe hippocampal neuroinflammatory features. Furthermore, we also observed that the HSB diet increased hippocampal fractalkine levels, a key chemokine associated with neuroprotection and inflammatory regulation. Then, we hypothesized that the elevation on glutamate levels may saturate synaptic communication, partially limiting plasticity, whereas fractalkine levels increase as a strategy to decrease glutamatergic damage.
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Affiliation(s)
- Roberta Ribeiro
- Department of Pharmacology, ICB, Federal University of Minas Gerais, Ave. Antonio Carlos 6627, Belo Horizonte, MG, CEP: 31270-901, Brazil
| | - Emanuele Guimarães Silva
- Department of Immunology and Biochemistry, ICB, University of Minas Gerais, Belo Horizonte, Brazil
| | - Felipe Caixeta Moreira
- Department of Immunology and Biochemistry, ICB, University of Minas Gerais, Belo Horizonte, Brazil
| | - Giovanni Freitas Gomes
- Center of Research in Inflammatory Diseases, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Gabriela Reis Cussat
- Department of Pharmacology, ICB, Federal University of Minas Gerais, Ave. Antonio Carlos 6627, Belo Horizonte, MG, CEP: 31270-901, Brazil
| | - Barbara Stehling Ramos Silva
- Department of Pharmacology, ICB, Federal University of Minas Gerais, Ave. Antonio Carlos 6627, Belo Horizonte, MG, CEP: 31270-901, Brazil
| | - Maria Carolina Machado da Silva
- Department of Pharmacology, ICB, Federal University of Minas Gerais, Ave. Antonio Carlos 6627, Belo Horizonte, MG, CEP: 31270-901, Brazil
| | | | - Carolina de Sena Oliveira
- Department of Pharmacology, ICB, Federal University of Minas Gerais, Ave. Antonio Carlos 6627, Belo Horizonte, MG, CEP: 31270-901, Brazil
| | | | - Victoria Lopes
- Colégio Técnico, University of Minas Gerais, Belo Horizonte, Brazil
| | | | | | - Tatiani Uceli Maioli
- Department of Immunology and Biochemistry, ICB, University of Minas Gerais, Belo Horizonte, Brazil
| | - Fabíola Mara Ribeiro
- Department of Immunology and Biochemistry, ICB, University of Minas Gerais, Belo Horizonte, Brazil
| | | | | | | | - Luciene Bruno Vieira
- Department of Pharmacology, ICB, Federal University of Minas Gerais, Ave. Antonio Carlos 6627, Belo Horizonte, MG, CEP: 31270-901, Brazil.
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