Acute stress facilitates long-lasting changes in cholinergic gene expression

Area of Science:

• Neuroscience
• Molecular Biology
• Psychiatry

Background:

• Acute traumatic stress can cause post-traumatic stress disorder (PTSD) with delayed neuropsychiatric symptoms.
• Acetylcholinesterase inhibitors can induce PTSD-like psychopathologies.
• The mechanisms linking stress, acetylcholinesterase inhibition, and long-term neuronal plasticity remain unclear.

Purpose of the Study:

• To investigate the molecular mechanisms underlying the long-term neuronal effects of acute stress.
• To explore the convergent mechanisms between stress and acetylcholinesterase inhibition on gene expression and neuronal excitability.
• To propose a model for how cholinergic stimulation influences gene regulation and neuronal plasticity.

Main Methods:

• Analysis of gene expression changes following acute stress and acetylcholinesterase blockade.
• Investigation of calcium-dependent gene modulation.
• Assessment of neuronal excitability changes mediated by muscarinic acetylcholine receptors.

Main Results:

• Both acute stress and acetylcholinesterase blockade induce similar bidirectional changes in genes regulating acetylcholine availability.
• These gene expression changes are calcium-dependent and coincide with distinct phases of neuronal excitability (enhancement and depression).
• Muscarinic acetylcholine receptors mediate these excitability phases.

Conclusions:

• Cholinergic system modulation plays a critical role in the long-term neuronal consequences of stress.
• A model is proposed where cholinergic stimulation induces c-Fos, which then regulates genes involved in acetylcholine metabolism.
• This provides a potential molecular mechanism linking stress, cholinergic activity, and neuropsychiatric outcomes.