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      Anti-bipolar therapy: mechanism of action of lithium.

      Molecular Psychiatry

      Animals, Neurotransmitter Agents, therapeutic use, Bipolar Disorder, metabolism, Humans, Brain, drug effects, Cytoskeleton, physiology, Protein Kinases, drug therapy, Models, Neurological, Neuronal Plasticity, physiopathology, Signal Transduction, Lithium

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          This review introduces the concepts that multiple actions of lithium are critical for its therapeutic effect, and that these complex effects stabilize neuronal activities, support neural plasticity, and provide neuroprotection. Three interacting systems appear most critical. (i) Modulation of neurotransmitters by lithium likely readjusts balances between excitatory and inhibitory activities, and decreased glutamatergic activity may contribute to neuroprotection. (ii) Lithium modulates signals impacting on the cytoskeleton, a dynamic system contributing to neural plasticity, at multiple levels, including glycogen synthase kinase-3beta, cyclic AMP-dependent kinase, and protein kinase C, which may be critical for the neural plasticity involved in mood recovery and stabilization. (iii) Lithium adjusts signaling activities regulating second messengers, transcription factors, and gene expression. The outcome of these effects appears likely to result in limiting the magnitudes of fluctuations in activities, contributing to a stabilizing influence induced by lithium, and neuroprotective effects may be derived from its modulation of gene expression.

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