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The ischemic environment drives microglia and macrophage function.
Stefano Fumagalli1, Carlo Perego2, Francesca Pischiutta2
1Department of Neuroscience, IRCCS-Istituto di Ricerche Farmacologiche Mario Negri , Milan , Italy ; Department of Pathophysiology and Transplantation, Fondazione IRCCS Ca' Granda-Ospedale Maggiore Policlinico , Milan , Italy.
Frontiers in Neurology
|April 24, 2015
Summary
Myeloid cells like microglia and macrophages have distinct roles in brain injury. Understanding their responses to hypoxia and developing strategies to modulate their functions offers new therapeutic avenues for brain repair.
Area of Science:
- Neuroscience
- Immunology
- Pathophysiology
Background:
- Myeloid cells, including microglia and macrophages, are crucial in brain injury pathophysiology, exhibiting both pro-inflammatory (M1) and neuroprotective (M2) functions.
- Environmental factors, particularly hypoxia, significantly influence myeloid cell distribution, activity, and phenotype, with distinct responses observed between microglia and macrophages.
- The intricate regulation of microglia and macrophage physiology, including neuron-derived inhibitory signals, is vital for maintaining homeostasis and responding appropriately to brain injury.
Purpose of the Study:
- To review and synthesize current literature on myeloid cell involvement in brain injury.
- To elucidate the differential responses of microglia and macrophages to hypoxia following stroke.
- To explore therapeutic strategies targeting myeloid cell polarization for enhanced brain repair.
Main Methods:
- Literature review of experimental research on myeloid cell function in brain injury.
- Analysis of studies investigating the effects of hypoxia on microglia and macrophages.
- Examination of markers and morphologies to identify myeloid cell subpopulations and functional states.
Main Results:
- Microglia and macrophages display unique adaptations to hypoxia, impacting their roles in brain injury.
- Specific markers and morphologies are identified to distinguish functional states of recruited myeloid cells.
- Chronic activation of microglia has significant functional consequences, highlighting the need for precise regulation.
Conclusions:
- Modulating myeloid cell polarization, potentially through strategies like stem cell treatment, holds promise for enhancing neuroprotection after brain injury.
- A deeper understanding of microglia and macrophage regulation provides new therapeutic possibilities for acute brain injury.
- Defining myeloid cell subpopulations recruited to injured sites is critical for targeted interventions.
Keywords:
acute brain injurycell morphologymacrophagesmicroglianeuroinflammationphenotypical polarization
