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p27kip1 Modulates the Morphology and Phagocytic Activity of Microglia
Jolien Beeken1,2, Sofie Kessels1, Jean-Michel Rigo1
1UHasselt, Hasselt University, BIOMED, 3500 Hasselt, Belgium.
Abstract:
p27kip1 is a multifunctional protein that promotes cell cycle exit by blocking the activity of cyclin/cyclin-dependent kinase complexes as well as migration and motility via signaling pathways that converge on the actin and microtubule cytoskeleton. Despite the broad characterization of p27kip1 function in neural cells, little is known about its relevance in microglia. Here, we studied the role of p27kip1 in microglia using a combination of in vitro and in situ approaches. While the loss of p27kip1 did not affect microglial density in the cerebral cortex, it altered their morphological complexity in situ. However, despite the presence of p27kip1 in microglial processes, as shown by immunofluorescence in cultured cells, loss of p27kip1 did not change microglial process motility and extension after applying laser-induced brain damage in cortical brain slices. Primary microglia lacking p27kip1 showed increased phagocytic uptake of synaptosomes, while a cell cycle dead variant negatively affected phagocytosis. These findings indicate that p27kip1 plays specific roles in microglia.
Insights
The protein p27, cyclin-dependent kinase inhibitor 1B (p27kip1), influences microglial morphology and phagocytosis. Loss of p27kip1 enhances microglial synaptosome uptake but does not affect motility.
Area of Science:
- Neuroscience
- Cell Biology
- Immunology
Background:
- p27kip1 is a key regulator of cell cycle, migration, and motility in various cell types.
- Its role in microglia, the brain's resident immune cells, remains largely unexplored.
- Microglia are crucial for brain homeostasis and respond to injury and disease.
Purpose of the Study:
- To investigate the function of p27kip1 in microglia.
- To determine the impact of p27kip1 on microglial density, morphology, motility, and phagocytosis.
Main Methods:
- In vitro studies using primary microglia cultures.
- In situ analysis in cortical brain slices with laser-induced damage.
- Immunofluorescence staining to detect p27kip1 localization.
- Assessment of microglial density, morphology, process extension, and phagocytic activity.
Main Results:
- Loss of p27kip1 did not alter microglial density in the cerebral cortex but affected their in situ morphological complexity.
- p27kip1 was detected in microglial processes, yet its absence did not impact microglial process motility or extension following brain injury.
- Primary microglia lacking p27kip1 exhibited increased phagocytic uptake of synaptosomes.
- A cell cycle-dead variant of p27kip1 impaired phagocytosis, suggesting a dual role.
Conclusions:
- p27kip1 plays specific, multifaceted roles in microglial function, influencing morphology and phagocytosis independently of cell cycle regulation and motility.
- These findings highlight p27kip1 as a potential target for modulating microglial responses in neurological contexts.
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