Chronic vitamin D3 treatment protects against neurotoxicity by glutamate in association with upregulation of vitamin D receptor mRNA expression in cultured rat cortical neurons

Journal of Neuroscience Research
Hideo TaniuraYukio Yoneda

Abstract

The vitamin D receptor (VDR) is believed to mediate different biologic actions of vitamin D3, an active metabolite of vitamin D, through regulation of gene expression after binding to specific DNA-response element (VDRE) on target genes. To further understand roles of both vitamin D3 and VDR in the central nervous system, we examined VDRE binding in nuclear extracts prepared from discrete rat brain regions and cultured rat cortical neurons by electrophoretic mobility shift assay. The highest activity of VDRE binding was found in the cerebellum among other brain regions examined, but sequence specific by taking into consideration the efficient competition with excess unlabeled VDRE but not with mutated VDRE. On in situ hybridization analysis, cells stained for VDR mRNA were abundant in neuron-enriched areas of cerebral cortex, hippocampus and cerebellar cortex in the mouse brain. Chronic treatment of vitamin D3 increased the expression of microtubule-associated protein-2, growth-associated protein-43 and synapsin-1 in cultured rat cortical neurons, suggesting a trophic role of vitamin D3 in differentiation and maturation of neurons. Neuronal cell death by brief glutamate exposure was significantly protected in cultured cortical ...Continue Reading

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