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Published on: September 6, 2024
Microglia as a Hub for Suicide Neuropathology: Future Investigation and Prevention Targets
Elisa Gonçalves de Andrade1,2, Fernando González Ibáñez2,3, Marie-Ève Tremblay2,3,4,5,6,7
1Neuroscience Graduate Program, Division of Medical Sciences, University of Victoria, Victoria, BC, Canada.
Abstract:
Suicide is a complex public health challenge associated worldwide with one death every 40 s. Research advances in the neuropathology of suicidal behaviors (SB) have defined discrete brain changes which may hold the key to suicide prevention. Physiological differences in microglia, the resident immune cells of the brain, are present in post-mortem tissue samples of individuals who died by suicide. Furthermore, microglia are mechanistically implicated in the outcomes of important risk factors for SB, including early-life adversity, stressful life events, and psychiatric disorders. SB risk factors result in inflammatory and oxidative stress activities which could converge to microglial synaptic remodeling affecting susceptibility or resistance to SB. To push further this perspective, in this Review we summarize current areas of opportunity that could untangle the functional participation of microglia in the context of suicide. Our discussion centers around microglial state diversity in respect to morphology, gene and protein expression, as well as function, depending on various factors, namely brain region, age, and sex.
Insights
Microglia, the brain's immune cells, show distinct physiological differences in individuals who died by suicide. Understanding these microglial changes is crucial for developing new suicide prevention strategies.
Area of Science:
- Neuroscience
- Immunology
- Psychiatry
Background:
- Suicide is a major global public health issue.
- Neuropathological research has identified brain changes associated with suicidal behaviors (SB).
- Microglia, the brain's resident immune cells, exhibit physiological differences in post-mortem samples from individuals who died by suicide.
Purpose of the Study:
- To review current research on the functional role of microglia in suicidal behaviors.
- To explore how microglial states (morphology, gene/protein expression, function) vary by brain region, age, and sex.
- To identify opportunities for understanding microglia's contribution to suicide risk and prevention.
Main Methods:
- Review of existing literature on microglia and suicidal behaviors.
- Analysis of microglial characteristics in post-mortem brain tissue.
- Examination of the link between risk factors (adversity, stress, psychiatric disorders) and microglial function.
- Discussion of microglial state diversity.
Main Results:
- Microglia are mechanistically implicated in the effects of key SB risk factors.
- Inflammatory and oxidative stress pathways associated with SB risk factors may converge on microglial synaptic remodeling.
- Microglial states, including morphology, gene and protein expression, and function, are diverse and influenced by brain region, age, and sex.
Conclusions:
- Microglial diversity is a critical factor in understanding susceptibility or resistance to suicidal behaviors.
- Further research into microglial functional participation is essential for advancing suicide prevention.
- Targeting microglial pathways may offer novel therapeutic strategies for SB.
