Potential link between the RagA-mTOR-p70S6K axis and depressive-behaviors during bacterial liposaccharide challenge.
J Neuroinflammation
; 16(1): 211, 2019 Nov 11.
Article
en En
| MEDLINE
| ID: mdl-31711501
ABSTRACT
BACKGROUND:
Bacterial infection is a potential risk factor for depression. However, little is known about the mechanistic link between bacterial endotoxin and depressive-like behaviors. The aim of the present study was to clarify whether liposaccharide (LPS) could induce depressive-like behaviors in mice via sequentially activating small GTPase RagA, mammalian target of rapamycin (mTOR), and p70S6K.METHODS:
C57BL/6 N mice were treated with 0.83 mg/kg LPS by intraperitoneal injection for 24 h. The animals were assessed for depressive-like behaviors by forced swim test and tail suspension test. The expression levels of RagA, mTOR, and p70S6K were determined in mice, primary cortical neurons, neural stem cells, and PC12 cells.RESULTS:
LPS effectively induced depressive-like behaviors in mice. Biochemical examination revealed that LPS not only upregulated RagA expression but also activated mTOR/p70S6K pathway in mouse brains. LPS challenge also achieved a similar effect in primary cortical neurons, neural stem cells, and PC12 cells. Following the silencing of RagA expression with specific siRNA, LPS failed to induce mTORC1 translocation to the lysosomal membranes in PC12 cells. These results suggested that LPS might sequentially upregulate RagA and activate mTOR and p70S6K pathways in mice and neural stem cells.CONCLUSIONS:
This study for the first time demonstrated that LPS might induce depressive-like behaviors in mice via the upregulation of RagA and subsequent activation of mTOR/p70S6K pathway. Such information may highlight the RagA-mTOR-p70S6K signaling cascade as a novel therapeutic target for the development of new anti-depressant therapeutics.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Transducción de Señal
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Lipopolisacáridos
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Proteínas de Unión al GTP Monoméricas
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Proteínas Quinasas S6 Ribosómicas 70-kDa
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Depresión
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Serina-Treonina Quinasas TOR
Tipo de estudio:
Risk_factors_studies
Límite:
Animals
Idioma:
En
Año:
2019
Tipo del documento:
Article