Morphological diversity of microglia: Implications for learning, environmental adaptation, ageing, sex differences
Marcus Augusto-Oliveira1, Gabriela de Paula Arrifano1, Caio Gustavo Leal-Nazaré1
1Laboratório de Farmacologia Molecular, Instituto de Ciências Biológicas, Universidade Federal do Pará, Belém, PA, Brazil; Amazonian Institute on Mercury (Instituto Amazônico do Mercúrio - IAMER).
Abstract:
Microglia are the brain resident macrophages that respond rapidly to any insult. These non-neuroectodermal cells are decorated with plenty of receptors allowing them to recognise and respond precisely to a multitude of stimuli. To do so, microglia undergo structural and functional changes aiming to actively keep the brain's homeostasis. However, some microglial responses, when sustained or exacerbated, can contribute to neuropathology and neurodegeneration. Many microglial molecular and cellular changes were identified that display a strong correlation with neuronal damage and neuroinflammation/disease status, as well as present key sex-related differences that modulate microglial outcomes. Nevertheless, the relationship between microglial structural and functional features is just beginning to be unravelled. Several reports show that microglia undergo soma and branch remodelling in response to environmental stimuli, ageing, neurodegenerative diseases, trauma, and systemic inflammation, suggesting a complex form and function link. Also, it is reasonable overall to suppose that microglia diminishing their process length and ramification also reduce their monitoring activity of synapses, which is critical for detecting any synaptic disturbance and performing synaptic remodelling. Elucidating the complex interactions between microglial morphological plasticity and its functional implications appears essential for the understanding of complex cognitive and behavioural processes in health and neuropathological conditions.
Insights
Microglia, the brain's immune cells, change shape and function in response to stimuli. Understanding these microglial changes is crucial for brain health and disease research.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are brain-resident macrophages crucial for homeostasis.
- Their responses to stimuli can lead to neuropathology if sustained.
- Sex-related differences influence microglial outcomes in disease.
Purpose of the Study:
- To explore the link between microglial structural and functional changes.
- To understand how microglial morphology impacts brain function and disease.
Main Methods:
- Review of existing literature on microglial morphology and function.
- Analysis of microglial structural changes (soma and branch remodeling).
- Correlation of morphological changes with functional implications in health and disease.
Main Results:
- Microglia exhibit significant structural and functional plasticity.
- Morphological changes are linked to environmental stimuli, aging, and neurodegenerative diseases.
- Reduced process length/ramification may impair synaptic monitoring and remodeling.
Conclusions:
- The relationship between microglial form and function is complex and under investigation.
- Understanding microglial morphological plasticity is essential for cognitive and behavioral research.
- Further research is needed to fully elucidate these interactions in neuropathology.
