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Primary Microglia Isolation from Mixed Glial Cell Cultures of Neonatal Rat Brain Tissue
Published on: August 15, 2012
Activation of neonatal microglia can be influenced by other neural cells
Alexandra Turano1, Jennifer H Lawrence1, Jaclyn M Schwarz1
1University of Delaware, Department of Psychological and Brain Sciences, 108 Wolf Hall, Newark, DE, 19716, USA.
Abstract:
During development, microglial progenitor cells migrate into the brain from the periphery, a process critical to the maturation of the developing brain. Although they perform functions similar to mature, adult microglia, immature microglia are distinct from mature microglia. Activation of immature microglia, via an early-life immune challenge, can lead to persistent changes in microglial function, resulting in long-term neuronal and cognitive dysfunction. Early-life immune activation is associated with multiple neurodevelopmental disorders, including autism, ADHD, schizophrenia, and cerebral palsy - disorders with known or suspected immune etiologies, and strong sex biases for males. Activation of immature microglia requires further examination to determine its potential role in these neurodevelopmental disorders. More work is also necessary to better understand the relationship between developing microglia and other developing neural cells during this critical period of development. Thus, we treated freshly isolated, sex-specific microglia from the rat hippocampus with lipopolysaccharide (LPS) on P4, in either the presence or absence of other neural cells. Mixed and microglial-specific cultures were analyzed for inflammatory gene expression to determine whether immature microglia exhibited a sex-specific response to immune activation, and if the presence of all other neural cells influenced that response. We found that the microglial response to an LPS-induced immune activation differed depending on the presence of other neural cells in the culture. We found very few sex differences in the cytokine response, except that the microglial expression of IL-6 following immune activation was more robust in male microglia that were in the presence of other neural cells than female microglia in the same condition.
Insights
Early-life immune activation of immature microglia can alter brain development. The presence of other neural cells influences microglial responses to immune challenges, with males showing a more robust IL-6 response.
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- Microglia, the brain's immune cells, originate from peripheral progenitors and are crucial for brain maturation.
- Immature microglia differ from adult microglia and their early-life activation by immune challenges can lead to lasting neurodevelopmental and cognitive deficits.
- Early-life immune activation is linked to neurodevelopmental disorders with sex biases, suggesting a role for immature microglia.
Purpose of the Study:
- To investigate the sex-specific response of immature microglia to immune activation.
- To determine if the presence of other neural cells influences the immune response of immature microglia.
- To explore the potential role of immature microglial activation in neurodevelopmental disorders.
Main Methods:
- Primary, sex-specific microglial cultures were isolated from rat hippocampus at postnatal day 4 (P4).
- Cultures were treated with lipopolysaccharide (LPS) to simulate immune activation, in the presence or absence of other neural cells.
- Inflammatory gene expression was analyzed to assess microglial responses.
Main Results:
- The microglial response to LPS-induced immune activation was dependent on the presence of other neural cells.
- Few sex differences were observed in the overall cytokine response.
- Male microglia in co-culture exhibited a more robust interleukin-6 (IL-6) expression following LPS treatment compared to female microglia.
Conclusions:
- Immature microglial responses to immune stimuli are modulated by the cellular environment.
- While sex differences are minimal, male microglia show a heightened IL-6 response in the presence of other neural cells during immune activation.
- These findings highlight the complex interplay between microglia, neural cells, and immune challenges during critical developmental periods and warrant further investigation into their role in neurodevelopmental disorders.
