​Learning-induced gene expression in thehippocampus reveals a role of neuron – astrocyte metabolic coupling in long term memory

by Tadi M., Allaman I., Lengacher S., Grenningloh G., Magistretti P.J.
Year: 2015 ISSN: DOI: 10.1371/journal.pone.0141568

Bibliography

​Learning-induced gene expression in thehippocampus reveals a role of neuron – astrocyte metabolic coupling in long term memory 
Tadi M., Allaman I., Lengacher S., Grenningloh G., Magistretti P.J. 
PLoS One, Volume 10, Issue 10, 29 October 2015, Article number e0141568

Abstract

Pub_LIG_2015​We examined the expression of genes related to brain energy metabolism and particularly those encoding glia (astrocyte)-specific functions in the dorsal hippocampus subsequent to learning. Context-dependent avoidance behavior was tested in mice using the step-through Inhibitory Avoidance (IA) paradigm. Animals were sacrificed 3, 9, 24, or 72 hours after training or 3 hours after retention testing. The quantitative determination of mRNA levels revealed learning-induced changes in the expression of genes thought to be involved in astrocyte-neuron metabolic coupling in a time dependent manner. Twenty four hours following IA training, an enhanced gene expression was seen, particularly for genes encoding monocarboxylate transporters 1 and 4 (MCT1, MCT4), alpha2 subunit of the Na/K-ATPase and glucose transporter type 1. To assess the functional role for one of these genes in learning, we studied MCT1 deficient mice and found that they exhibit impaired memory in the inhibitory avoidance task. Together, these observations indicate that neuron-glia metabolic coupling undergoes metabolic adaptations following learning as indicated by the change in expression of key metabolic genes.

Keywords

Avoidance behavior Brain Mapping Controlled study Energy metabolism Gene Gene Expression Glut1 gene