Classically and alternatively activated bone marrow derived macrophages differ in cytoskeletal functions and

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Analysis of Microglia and Monocyte-derived Macrophages from the Central Nervous System by Flow Cytometry
10:43

Analysis of Microglia and Monocyte-derived Macrophages from the Central Nervous System by Flow Cytometry

Published on: June 22, 2017

Elly J F Vereyken1, Priscilla D A M Heijnen, Wia Baron

  • 1Department of Molecular Cell Biology and Immunology, VU University Medical Center, Amsterdam, The Netherlands.

Journal of Neuroinflammation
|May 28, 2011
PubMed
Abstract

Insights

Classically activated (CA) macrophages exhibit enhanced adhesion and phagocytosis, while alternatively activated (AA) macrophages show greater motility and neuronal attraction. This differential behavior influences their roles in CNS diseases.

Area of Science:

  • Neuroimmunology
  • Cell Biology

Background:

  • Macrophages are key players in CNS inflammatory diseases like MS and SCI.
  • Their divergent roles in damage and repair are linked to distinct activation states: pro-inflammatory (CA/M1) and growth-promoting (AA/M2).
  • Understanding CNS macrophage phenotypes is crucial for neuroinflammatory disease pathogenesis.

Purpose of the Study:

  • To investigate the distinct characteristics of classically activated (CA) and alternatively activated (AA) macrophages within the central nervous system (CNS) in vitro.
  • To elucidate how these macrophage phenotypes influence neuroinflammation and repair processes.

Main Methods:

  • Cultured bone marrow-derived macrophages were differentiated into CA and AA phenotypes.
  • Migration assays were performed using conditioned media from CNS cells (neurons, astrocytes, oligodendrocytes).
  • Macrophage motility, adhesion to extracellular matrix (ECM), cytoskeleton organization, and phagocytosis were analyzed.

Main Results:

  • AA macrophages demonstrated higher intrinsic motility and preferential attraction to neuronal conditioned medium.
  • CA macrophages exhibited increased adhesion to ECM and enhanced phagocytosis of myelin and neuronal debris.
  • Differential organization of the actin cytoskeleton and GTPase activity (RhoA, Rac) were observed between CA and AA macrophages.

Conclusions:

  • AA macrophages, with their high motility and neuronal attraction, are poised to migrate towards neurons in the CNS.
  • CA macrophages, characterized by lower motility and stronger ECM adhesion, may limit lesion expansion by restricting bystander damage in neuroinflammatory diseases.
  • These findings highlight the distinct functional roles of macrophage phenotypes in the CNS context.

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