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Published on: January 30, 2014
Microglia reactivity is brain region and sex specific in the context of chronic stress
Ariel Y Zhang1, Elias Elias1, Abigail G White1
1Department of Biological and Biomedical Sciences, Rowan University, Glassboro, NJ, 08028, USA.
Abstract:
Chronic stress has been associated with an increased inflammatory profile in the brain, linking inflammation to the development of stress-related disorders. Although the detailed mechanism connecting chronic stress to inflammation remains unclear, as primary mediators of the immune response, it has been established that microglia play a role. We further investigated the effect of chronic stress on microglia reactivity by incorporating sex and multiple brain regions as variables in our analysis. We utilized the unpredictable chronic mild stress (UCMS) paradigm and then quantified the number of microglia, process arborization, process length, and the number of processes of microglia in the prefrontal cortex (PFC), nucleus accumbens (NAC), hypothalamus (HYPO), amygdala (AMY), and hippocampal CA1 and CA3. We did not observe a stress-induced change in the number of microglia in each region; however, chronic stress reduced microglia arborization, length, and number of processes in a brain region and sex-specific manner. Independent of stress, microglia exhibited a region-dependent reactive phenotype. Together, chronic stress affects microglia reactivity uniquely based on sex and brain region, while the different reactivity profile of microglia in males and females might underlie the sex-specific mechanism of the diseases.
Insights
Chronic stress alters brain microglia in a sex- and region-specific manner, impacting their structure and function. These changes in microglia reactivity may contribute to sex-specific stress-related disorders.
Area of Science:
- Neuroscience
- Immunology
- Stress Research
Background:
- Chronic stress is linked to brain inflammation and stress-related disorders.
- Microglia, the brain's immune cells, are implicated in this process.
- The precise mechanisms and sex-specific differences remain unclear.
Purpose of the Study:
- To investigate the impact of chronic stress on microglia reactivity.
- To examine these effects across multiple brain regions and in both sexes.
- To understand how stress influences microglia morphology and function.
Main Methods:
- Utilized the unpredictable chronic mild stress (UCMS) paradigm.
- Quantified microglia number, process arborization, process length, and process number.
- Analyzed data from the prefrontal cortex, nucleus accumbens, hypothalamus, amygdala, and hippocampus (CA1 and CA3).
Main Results:
- Chronic stress did not alter the total number of microglia in any region.
- Stress significantly reduced microglia arborization, process length, and number of processes.
- These effects were dependent on the specific brain region and the sex of the subject.
- Microglia displayed a region-dependent reactive phenotype independent of stress exposure.
Conclusions:
- Chronic stress uniquely affects microglia reactivity based on sex and brain region.
- Sex-specific differences in microglia reactivity may underlie the distinct mechanisms of stress-related disorders in males and females.
- These findings highlight the complex interplay between stress, sex, and neuroinflammation.
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