Lithium Treatment Mechanisms in Mood Disorders
Summary
Lithium remains the gold-standard mood stabiliser for bipolar disorder and is also employed in treatment-resistant depression. Despite its long clinical history, its therapeutic action continues to be elucidated through molecular, cellular and systems-level studies. Central to its efficacy is the inhibition of key enzymes such as glycogen synthase kinase-3β, which modulates intracellular signalling cascades linked to gene transcription, neurotrophic support and synaptic plasticity. Lithium’s modulation of inositol monophosphatase activity influences phosphoinositide turnover and downstream second-messenger systems. At the cellular level, lithium enhances neuroprotection by up-regulating anti-apoptotic proteins, reducing oxidative stress and bolstering mitochondrial function. It also exerts anti-inflammatory effects by regulating cytokine release. In neural circuits, lithium fosters a balanced excitatory/inhibitory synaptic milieu, stabilising neuronal network activity and dampening pathological hyperexcitability. These multifaceted actions underpin its capacity to prevent mood episodes, reduce suicidal behaviour and improve long-term functional outcomes.
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Lithium Treatment Mechanisms in Mood Disorders publication trend
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Technical terms
Induced pluripotent stem cell (iPSC): A mature cell reprogrammed to an embryonic-like state, capable of differentiating into neural cell types for in vitro modelling of disease mechanisms.
Glycogen synthase kinase-3β (GSK3β): A serine/threonine kinase whose inhibition by lithium modulates transcription factors, neurotrophic signalling and cell survival.
Excitatory/inhibitory (E/I) balance: The ratio of glutamatergic excitatory to GABAergic inhibitory synaptic transmission that governs network stability and information processing in the brain.
Neurotrophic factors: Proteins such as BDNF that promote neuronal growth, differentiation and synaptic plasticity, often up-regulated by lithium to support neuroprotection.
Neuroprotection: Cellular processes that preserve neuron viability under stress, encompassing anti-apoptotic signalling, antioxidant defence and mitochondrial support.
References
- Transcriptional and functional effects of lithium in bipolar disorder iPSC-derived cortical spheroids. Molecular Psychiatry (2023).
- An Oldie but Goodie: Lithium in the Treatment of Bipolar Disorder through Neuroprotective and Neurotrophic Mechanisms. International Journal of Molecular Sciences (2017).
- Towards a Unified Understanding of Lithium Action in Basic Biology and its Significance for Applied Biology. The Journal of Membrane Biology (2017).
- Long Term Lithium Treatment Suppresses p53 and Bax Expression but Increases Bcl-2 Expression A PROMINENT ROLE IN NEUROPROTECTION AGAINST EXCITOTOXICITY*. Journal of Biological Chemistry (1999).
- Inhibition of GSK3 by lithium, from single molecules to signaling networks. Frontiers in Molecular Neuroscience (2012).
- Excitatory and inhibitory synaptic dysfunction in mania: an emerging hypothesis from animal model studies. Experimental & Molecular Medicine (2018).
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