The impact of fasting on resting state brain networks in mice

Abstract : Fasting is known to infuence learning and memory in mice and alter the neural networks that subserve these cognitive functions. We used high-resolution functional MRI to study the impact of fasting on resting-state functional connectivity in mice following 12h of fasting. The cortex and subcortex were parcellated into 52 subregions and functional connectivity was measured between each pair of subregions in groups of fasted and non-fasted mice. Functional connectivity was globally increased in the fasted group compared to the non-fasted group, with the most signifcant increases evident between the hippocampus (bilateral), retrosplenial cortex (left), visual cortex (left) and auditory cortex (left). Functional brain networks in the non-fasted group comprised fve segregated modules of strongly interconnected subregions, whereas the fasted group comprised only three modules. The amplitude of low frequency fuctuations (ALFF) was decreased in the ventromedial hypothalamus in the fasted group. Correlation in gamma oscillations derived from local feld potentials was increased between the left visual and retrosplenial cortices in the fasted group and the power of gamma oscillations was reduced in the ventromedial hypothalamus. These results indicate that fasting induces profound changes in functional connectivity, most likely resulting from altered coupling of neuronal gamma oscillations.
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Tomokazu Tsurugizawa, Boucif Djemai, Andrew Zalesky. The impact of fasting on resting state brain networks in mice. Scientific Reports, Nature Publishing Group, 2019, 9 (1), pp.2976. ⟨10.1038/s41598-019-39851-6⟩. ⟨cea-02076873⟩

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