The mechanism of lithium action: State of the art, ten years later

A. Shaldubina, G. Agam, R. H. Belmaker

Research output: Contribution to journalArticlepeer-review

124 Scopus citations

Abstract

1. Lithium is an effective drug for both treatment and prophylaxis of bipolar disorder. However, the mechanism of lithium action is still unknown. 2. The inositol depletion hypothesis is supported by biochemical and behavioral data in rats, but primate inositol levels are higher than in rodents and may obviate the effects of depletion. 3. Inhibition of 5HT autoreceptors by lithium is supported by biochemical and behavioral data in rats but would seem more related to lithium's antidepressant than to its antimanic or prophylactic effects. 4. Lithium induces increases in levels of the anti-apoptotic factor Bcl-2. This effect could be most relevant for treatment of neurodegenerative disorders. 5. Lithium inhibits glycogen synthase kinase-3, which is involved in a wide range of signal transduction pathways. However, this lithium effect occurs at high concentrations and may be more relevant for its toxic effect. 6. Lithium in low concentrations induces accumulation of PAP, which affects several cellular processes including RNA processing. However, PAP phosphatase is present more in peripheral tissues than in brain. This lithium effect could explain some of its peripheral side effects. 7. Chronic lithium administration upregulates glutamate reuptake and thus decreases glutamate availability in synapse. Glutamate is an excitatory neurotransmitter and its reduction could exert an antimanic effect. 8. Biochemical and clinical experiments are necessary to determine the key mechanism of lithium efficacy in treatment and prophylaxis of affective disorders.

Original languageEnglish
Pages (from-to)855-866
Number of pages12
JournalProgress in Neuro-Psychopharmacology and Biological Psychiatry
Volume25
Issue number4
DOIs
StatePublished - 1 Jan 2001
Externally publishedYes

Keywords

  • 3′(2′)phosphoadenosine 5′ phosphate
  • 5HT autoreceptors
  • Bcl-2
  • Glutamate
  • Glycogen synthase kinase-3
  • Inositol monophosphatase
  • Lithium

ASJC Scopus subject areas

  • Pharmacology
  • Biological Psychiatry

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