Modulation of frontal cortex NDRG1 and the effects on myelination, ethanol sensitivity, and ethanol consumption

Virginia Commonwealth University, Richmond VA

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Abstract

Project Summary This project aims to study and better define a potential biological pathway which multiple pieces of evidence have suggested plays a role in behavioral responses to ethanol. This pathway is centered around N-myc downstream-regulated gene 1 (NDGR1), whose expression in the prefrontal cortex (PFC) has been linked the acute ethanol sensitivity phenotype, loss of righting reflex (LORR) duration. Mutations in NDRG1 in humans are the cause of Charcot-Marie-Tooth disease type 4D (CMT4D), a disease that severely affects peripheral myelination by inhibiting the function of Schwann Cells. In the CNS, NDRG1 expression has been shown to be a key network regulator of multiple myelin-related genes in the PFC, particularly in the presence of ethanol. Multiple studies have found that NDRG1 expression levels and sub-cellular localization varies substantially between cell-types throughout the body. Additionally, there is a large amount of evidence to suggest that phosphorylation of the protein alters its physiological function within the cell. Using a time course and dose response study, we will investigate the regulation of NDRG1 by ethanol and ethanol?s effects on the level of mRNA expression, protein abundance, protein phosphorylation, and protein localization within oligodendrocytes and pyramidal neurons of the PFC of mice after acute doses of ethanol and after a voluntary consumption drinking study. Additionally, we will develop, validate, and use viral vectors for cell-type specific overexpression NDRG1 in either oligodendrocytes or neurons within the PFC of mice. We will then study the effect of overexpression of this transcript on LORR duration and ethanol consumption and preference by providing voluntary ethanol access via an intermittent access drinking model. Finally, we will investigate the effect of overexpression of this transcript on basal myelin-related gene expression within the PFC and the overall transcriptome of the PFC.