Jing_2013_Chem.Biol.Interact_203_309

Lithium is one of the most widely used mood-stabilizing agents for the treatment of bipolar disorder. Lithium is also a potent inhibitor of glycogen synthase kinase-3beta (GSK3beta) activity, which is linked to Alzheimer's disease (AD). In experiments with cultured HEK293T cells, we show here that GSK3beta stabilizes synaptic acetylcholinesterase (AChE-S), a critical component of AD development. Cells treated with lithium exhibited rapid proteasomal degradation of AChE-S. Furthermore treatment of the cells with MG132, an inhibitor of the 26S proteasome, prevented the destabilizing effect of lithium on AChE-S. Taken together, these findings suggest that regulation of AChE-S protein stability may be an important biological target of lithium therapy.