PMID: 9523597Apr 2, 1998Paper

Lithium increases tyrosine hydroxylase levels both in vivo and in vitro

Journal of Neurochemistry
G ChenH K Manji

Abstract

Lithium, a simple monovalent cation, is the mainstay in the treatment of manic-depressive illness, but despite extensive research, its mechanism of action remains to be elucidated. Because lithium requires chronic administration for therapeutic efficacy and because its beneficial effects last well beyond its discontinuation, it has been postulated that lithium may exert major effects at the genomic level. We have previously shown that lithium, at therapeutically relevant concentrations, increases gene expression through the activator protein-1 (AP-1) transcription factor pathway in vitro. In the present study, we have sought to determine if lithium also increases the expression of endogenous genes known to be regulated by AP-1 and have therefore investigated the effects of lithium on tyrosine hydroxylase (TH) levels. Male Wistar rats were treated with LiCl for 9 days (subacute) or 4 weeks (chronic), and TH levels were measured in frontal cortex, hippocampus, and striatum using immunoblotting. Chronic (but not subacute) lithium treatment resulted in significant increases in TH levels in rat frontal cortex, hippocampus, and striatum. Lithium (1 mM) also increased TH levels in human SH-SY5Y neuroblastoma cells in vitro, indicating...Continue Reading

Citations

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