Microglial Alkbh5 Deficiency Alleviates Chronic Restraint Stress-Induced Depression-like Behaviors in Mice

Area of Science:

• Neuroscience
• Immunology
• Molecular Biology

Background:

• Depression is a severe neuropsychiatric disorder with unclear biological mechanisms.
• Microglia, the central nervous system's immune cells, play a role in depression.
• N6-methyladenosine (m6A) RNA modification regulates microglial function, but its role in depression is unknown.

Purpose of the Study:

• To investigate the role and molecular mechanisms of m6A modification, specifically Alkbh5, in microglia within a depression mouse model.
• To determine if targeting Alkbh5 in microglia can alleviate depression-like behaviors.

Main Methods:

• Utilized a chronic restraint stress (CRS)-induced depression mouse model.
• Assessed m6A levels and Alkbh5 expression in microglia.
• Generated microglial-specific conditional Alkbh5 knockout mice to study its functional role.
• Evaluated depression-like behaviors, microglial activation, dendritic spine loss, and vascular changes.

Main Results:

• m6A levels were decreased, while Alkbh5 expression was significantly increased in microglia of the CRS mouse model.
• Microglial-specific Alkbh5 deficiency alleviated depression-like behaviors induced by CRS.
• Alkbh5 deficiency in microglia inhibited excessive microglial activation, rescued dendritic spine loss, and regulated vascular changes.

Conclusions:

• Alkbh5 plays a critical role in regulating microglial function in the context of stress-induced depression.
• Targeting microglial Alkbh5 presents a potential therapeutic strategy for depression.