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Integrin-Kindlin3 requirements for microglial motility in vivo are distinct from those for macrophages
Julia Meller1, Zhihong Chen2, Tejasvi Dudiki1
1Department of Molecular Cardiology and.
Abstract:
Microglia play a critical role in the development and homeostasis of the CNS. While mobilization of microglia is critical for a number of pathologies, understanding of the mechanisms of their migration in vivo is limited and often based on similarities to macrophages. Kindlin3 deficiency as well as Kindlin3 mutations of integrin-binding sites abolish both integrin inside-out and outside-in signaling in microglia, thereby resulting in severe deficiencies in cell adhesion, polarization, and migration in vitro, which are similar to the defects observed in macrophages. In contrast, while Kindlin3 mutations impaired macrophage mobilization in vivo, they had no effect either on the population of microglia in the CNS during development or on mobilization of microglia and subsequent microgliosis in a model of multiple sclerosis. At the same time, acute microglial response to laser-induced injury was impaired by the lack of Kindlin3-integrin interactions. Based on 2-photon imaging of microglia in the brain, Kindlin3 is required for elongation of microglial processes toward the injury site and formation of phagosomes in response to brain injury. Thus, while Kindlin3 deficiency in human subjects is not expected to diminish the presence of microglia within CNS, it might delay the recovery process after injury, thereby exacerbating its complications.
Insights
Kindlin3 protein is essential for microglia to respond to brain injury by extending processes and forming phagosomes. However, it does not affect microglia populations or their role in diseases like multiple sclerosis.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are crucial for central nervous system (CNS) development and homeostasis.
- Microglial migration is vital for CNS pathologies, but in vivo mechanisms are poorly understood.
- Kindlin3 protein regulates integrin signaling, impacting cell adhesion and migration, similar to macrophages.
Purpose of the Study:
- To investigate the role of Kindlin3 in microglial function and migration in vivo.
- To compare Kindlin3's effects on microglia with its known effects on macrophages.
- To elucidate Kindlin3-dependent microglial responses to CNS injury.
Main Methods:
- Analysis of Kindlin3 deficiency and mutations affecting integrin-binding sites in microglia.
- In vitro assessment of microglial adhesion, polarization, and migration.
- In vivo studies using a multiple sclerosis model and laser-induced brain injury.
- Two-photon imaging of microglia in the brain.
Main Results:
- Kindlin3 deficiency severely impairs microglial adhesion, polarization, and migration in vitro.
- In vivo, Kindlin3 deficiency does not affect microglial populations during development or in a multiple sclerosis model.
- Kindlin3 is crucial for acute microglial response to laser-induced injury, including process elongation and phagosome formation.
Conclusions:
- Kindlin3 is essential for microglia's acute response to brain injury, but not for their overall presence or role in chronic conditions like MS.
- Kindlin3 deficiency may delay injury recovery and worsen complications by impairing microglial mobilization and phagocytosis.
- Understanding Kindlin3's role clarifies microglial behavior in CNS injury and disease, distinct from macrophage responses.
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