Inhalational Anesthetics Induce Neuronal Protein Aggregation and Affect ER Trafficking

Area of Science:

• Neuroscience
• Molecular Biology
• Pharmacology

Background:

• Anesthetic agents are linked to neurological deficits and neurodegenerative disease exacerbation.
• Anesthetics may promote Congenital Central Hypoventilation Syndrome (CCHS) by affecting Phox2B protein folding.
• Understanding anesthetic effects on protein folding is crucial for patient safety.

Purpose of the Study:

• To investigate how anesthetic agents influence neuronal function via protein folding alterations.
• To model the impact of anesthetics on Phox2B misfolding in neuronal cells.
• To elucidate the role of endoplasmic reticulum stress in anesthetic-induced neuronal dysfunction.

Main Methods:

• Developed neuronal cell models simulating CCHS severity.
• Administered isoflurane and morphine to assess Phox2B aggregation and localization.
• Analyzed transcriptomic and proteomic changes related to the unfolded protein response.
• Investigated the effect of ER stress pathway attenuation.
• Examined isoflurane's impact on CFTR channel folding and activity.

Main Results:

• Isoflurane and morphine potentiated Phox2B aggregation and mislocalization, mimicking CCHS.
• Observed activation of the endoplasmic reticulum unfolded protein response.
• ER stress pathway attenuation did not correct Phox2B misfolding, suggesting a direct structural effect.
• Isoflurane impaired the folding and function of ER-dependent proteins like CFTR.

Conclusions:

• Anesthetic drugs can directly alter protein structure and induce endoplasmic reticulum stress.
• This mechanism may explain how anesthetics contribute to neuronal dysfunction after surgery.
• Findings highlight a novel pathway for anesthetic-induced neurological complications.