Alcohol Disrupts Neural Differentiation Through Endoplasmic Reticulum Stress and PERK Pathway Activation

Area of Science:

• Neuroscience
• Developmental Biology
• Toxicology

Background:

• Prenatal alcohol exposure (PAE) causes fetal alcohol spectrum disorder (FASD), leading to neurodevelopmental deficits.
• The molecular mechanisms underlying PAE-induced brain defects, particularly in neurogenesis and neural differentiation, are not fully understood.

Purpose of the Study:

• To investigate how alcohol disrupts neural differentiation and neurogenesis.
• To explore the role of endoplasmic reticulum (ER) stress and the PERK pathway in PAE-induced neurodevelopmental impairments.

Main Methods:

• Utilized in vitro (NE-4C neural stem cells) and in vivo (pregnant mice exposed to alcohol) models.
• Assessed neural differentiation using immunofluorescence, immunoblotting, and flow cytometry.
• Investigated ER stress using tunicamycin and MANF-deficient cells, focusing on PERK pathway activation.

Main Results:

• Alcohol exposure impaired neural differentiation and induced ER stress, activating the PERK pathway.
• ER stress induced by tunicamycin or MANF deficiency also disrupted neural differentiation and activated PERK.
• Inhibition of PERK partially reversed alcohol-induced impairments in neuronal differentiation and neurogenesis.

Conclusions:

• Alcohol-induced ER stress, particularly PERK pathway activation, is a key mechanism contributing to impaired neurogenesis in FASD.
• Targeting the PERK pathway may offer a therapeutic strategy for mitigating PAE-induced neurodevelopmental deficits.