Microglia Regulate Neuronal Circuits in Homeostatic and High-Fat Diet-Induced Inflammatory Conditions

Area of Science:

• Neuroscience
• Immunology
• Metabolism

Background:

• Microglia are essential brain-resident macrophages involved in synaptic remodeling and tissue homeostasis.
• Their dysfunction, driven by chronic inflammation, contributes to neurological disorders like cognitive decline and obesity.
• High-fat diet (HFD) consumption activates hypothalamic and hippocampal microglia, leading to inflammation and deficits.

Purpose of the Study:

• To review microglial characteristics and biological functions.
• To explore the molecular mechanisms of microglia in neural circuitry.
• To understand microglia's role in cognition and energy balance under homeostatic and inflammatory conditions.

Main Methods:

• Literature review of microglial biology.
• Analysis of molecular mechanisms in neural circuit shaping.
• Synthesis of data on diet-induced inflammation and microglial activation.

Main Results:

• Microglia play a dual role: maintaining homeostasis and causing impairment when activated.
• HFD triggers microglial activation in the hypothalamus and hippocampus.
• This activation leads to inflammation, synaptic changes, and associated functional deficits.

Conclusions:

• Microglial activation and dysfunction are central to HFD-induced cognitive and metabolic disorders.
• Targeting microglial pathways may offer therapeutic strategies for diet-related brain diseases.
• Further research into microglial mechanisms is crucial for understanding brain health and disease.