Morphological changes in microglia in the mouse brain during postnatal development and obesity.

Area of Science:

• Neuroscience
• Immunology
• Developmental Biology

Background:

• Microglia are central nervous system (CNS) innate immune cells crucial for brain development and function.
• Microglial morphology is highly plastic during postnatal development, rapidly adapting to the brain's environment.
• Detailed understanding of microglial dynamics and phenotypes during this period remains incomplete.

Purpose of the Study:

• To systematically investigate microglial density and morphological alterations during postnatal development.
• To examine microglial changes in the context of pathological obesity.
• To characterize the spatiotemporal distribution and reactivity of microglia across different brain regions.

Main Methods:

• Quantitative analysis of microglial density and morphology.
• Comparative study between developing and diet-induced obese mouse models.
• Region-specific analysis of microglial characteristics, focusing on the hypothalamus.

Main Results:

• A distinct spatiotemporal distribution of microglia was observed across various brain regions during postnatal development.
• Microglial complexity generally increased with age throughout postnatal development.
• Obesity induced microglial reactivity in most brain areas, with notable region-specific morphological diversity, particularly in the hypothalamus.

Conclusions:

• Microglial morphology exhibits significant dynamic changes correlating with specific developmental time windows.
• The study provides foundational data on microglial plasticity in development and obesity.
• These findings highlight region-specific microglial responses, especially in the hypothalamus, offering insights for future research.