Lithium treatment arrests the development of neurofibrillary tangles in mutant tau transgenic mice with advanced neurofibrillary pathology

Journal of Alzheimer's Disease : JAD
Karelle LeroyJean-Pierre Brion

Abstract

Neurofibrillary tangles (NFTs) made of phosphorylated tau proteins are a key lesion of Alzheimer's disease and other neurodegenerative diseases, and previous studies have indicated that lithium can decrease tau phosphorylation in tau transgenic models. In this study, we have reassessed the effectiveness of treatment per os with lithium on the prevention, the arrest, or the reversal of NFT development in a tau transgenic line (Tg30tau) developing severe neurofibrillary pathology in the brain and the spinal cord. Wild-type and Tgtau30 mice were treated per os with lithium carbonate or with natrium carbonate by chronic chow feeding for 8 months starting at the age of 3 months (to test for a preventive effect on NFT formation) or by oral gavage for 1 month starting at the age of 9 months (after development of NFTs). In mice treated by oral gavage, a decrease of tau phosphorylation and of Sarkosyl-insoluble aggregated tau was observed in the brain and in the spinal cord. The density of NFTs identified by Gallyas staining in the hippocampus and in the spinal cord was also significantly reduced and was similar to that observed at the beginning of the lithium treatment. In these animals, the level of brain beta-catenin was increased pr...Continue Reading

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