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Published on: September 4, 2013
Morphology of Cortical Microglia in the Hyperacute Phase of Subarachnoid Hemorrhage
Maksim Lyubomudrov1, Anastasiya Babkina1, Zoya Tsokolaeva1
1Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology, Moscow 107031, Russia.
Abstract:
Hemorrhagic stroke is the deadliest type of stroke. Cellular and molecular biomarkers are important for understanding the pathophysiology of stroke. Microglia are among the most promising biological markers. However, the morphological and physiological characteristics of microglia, as well as the structural and functional aspects of their interactions with neurons and other cells, are largely unknown. Due to the large number of different morphological phenotypes and very limited information on microglial changes in subarachnoid hemorrhage (SAH), we performed this study aimed at identifying the features of the distribution of various microglial phenotypes in the layers of the cerebral cortex in the hyperacute phase of non-traumatic SAH. We studied the distribution of various microglial phenotypes in the layers of the cerebral cortex of SAH non-survivors with a control group (coronary heart disease and sudden cardiac death were the underlying causes of death). An immunohistochemical study using antibodies to iba-1 (a marker of microglia) revealed changes in the morphological phenotypes of microglia in the cerebral cortex after subarachnoid hemorrhage. Significant differences between the groups indicate a rapid microglial response to injury. The findings indicate that there are quantitative and phenotypic changes in microglia in the cerebral cortex during early SAH in the human cortex.
Insights
Microglia, immune cells in the brain, rapidly change their shape and numbers in the cerebral cortex after subarachnoid hemorrhage (SAH), a severe stroke type. These early microglial changes indicate a significant injury response.
Area of Science:
- Neuroscience
- Pathology
- Immunology
Background:
- Hemorrhagic stroke, particularly subarachnoid hemorrhage (SAH), is a critical medical condition with high mortality.
- Understanding the cellular and molecular mechanisms of stroke pathophysiology is crucial for developing effective treatments.
- Microglia, the resident immune cells of the central nervous system, are implicated as key players in stroke but their early changes remain poorly understood.
Purpose of the Study:
- To investigate the distribution and morphological phenotypes of microglia in the cerebral cortex during the hyperacute phase of non-traumatic subarachnoid hemorrhage (SAH).
- To identify early microglial responses and their phenotypic changes in the human cortex following SAH.
Main Methods:
- An immunohistochemical study was conducted using iba-1, a specific marker for microglia.
- The distribution of microglial phenotypes was analyzed in the cerebral cortical layers of SAH non-survivors.
- A control group, comprising individuals who died from coronary heart disease or sudden cardiac death, was used for comparison.
Main Results:
- Significant differences in microglial distribution and morphology were observed between SAH non-survivors and the control group.
- The study revealed rapid and distinct changes in microglial phenotypes within the cerebral cortex following SAH.
- Quantitative and phenotypic alterations in microglia were evident in the early stages of SAH in the human cortex.
Conclusions:
- Microglia exhibit a rapid and significant response to subarachnoid hemorrhage in the human cerebral cortex.
- The observed quantitative and phenotypic changes in microglia suggest their critical role in the early pathophysiology of SAH.
- Further research into microglial behavior can provide valuable insights into stroke mechanisms and potential therapeutic targets.
