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Journal Article
Research Support, Non-U.S. Gov't
Dietary magnesium deficiency impairs hippocampus-dependent memories without changes in the spine density and morphology of hippocampal neurons in mice.
Brain Research Bulletin 2019 January
Magnesium (Mg2+ ) is an essential mineral for maintaining biological functions. One major action of Mg2+ in the brain is modulating the voltage-dependent blockade of N-methyl-d-aspartate type glutamate receptors, thereby controlling their opening, which is crucial for synaptic plasticity. Therefore, Mg2+ has been shown to play critical roles in learning and memory, and synaptic plasticity. However, the effects of dietary Mg2+ deficiency (MgD) on learning and memory and the morphology of neurons contributing to memory performance have not been examined in depth. Here, we show that MgD impairs hippocampus-dependent memories in mice. Mice fed an MgD diet showed deficits in hippocampus-dependent contextual fear, spatial and social recognition memories, although they showed normal amygdala- and insular cortex-dependent conditioned taste aversion memory, locomotor activity, and emotional behaviors such as anxiety-related and social behaviors. However, MgD mice showed normal spine density and morphology of hippocampal neurons. These findings suggest that MgD impairs hippocampus-dependent memory without affecting the morphology of hippocampal neurons.
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