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Updated: Aug 9, 2025
One-channel Cell-attached Patch-clamp Recording
Published on: June 9, 2014
The mechanosensitive ion channel Piezo1 modulates the migration and immune response of microglia
Ting Zhu1, Jinghui Guo1, Yong Wu1
1Department of Biomedical Engineering, the Hong Kong Polytechnic University, Hung Hom, Hong Kong SAR 999077, P. R. China.
Abstract:
Microglia are the brain's resident immune cells, performing surveillance to promote homeostasis and healthy functioning. While microglial chemical signaling is well-studied, mechanical cues regulating their function are less well-understood. Here, we investigate the role of the mechanosensitive ion channel Piezo1 in microglia migration, pro-inflammatory cytokine production, and stiffness sensing. In Piezo1 knockout transgenic mice, we demonstrated the functional expression of Piezo1 in microglia and identified genes whose expression was consequently affected. Functional assays revealed that Piezo1 deficiency in microglia enhanced migration toward amyloid β-protein, and decreased levels of pro-inflammatory cytokines produced upon stimulation by lipopolysaccharide, both in vitro and in vivo. The phenomenon could be mimicked or reversed chemically using a Piezo1-specific agonist or antagonist. Finally, we also showed that Piezo1 mediated the effect of substrate stiffness-induced migration and cytokine expression. Altogether, we show that Piezo1 is an important molecular mediator for microglia, its activation modulating microglial migration and immune responses.
Insights
The mechanosensitive ion channel Piezo1 regulates microglia function. Piezo1 deficiency enhances microglial migration and reduces inflammatory cytokine release, impacting brain immune responses.
Area of Science:
- Neuroimmunology
- Cellular Mechanobiology
Background:
- Microglia are crucial for brain homeostasis, with their functions influenced by both chemical and mechanical cues.
- The role of mechanical signals, particularly through mechanosensitive ion channels like Piezo1, in microglial function remains largely unexplored.
Purpose of the Study:
- To investigate the role of the mechanosensitive ion channel Piezo1 in regulating microglial migration, pro-inflammatory cytokine production, and response to substrate stiffness.
- To elucidate the functional impact of Piezo1 in microglia using knockout models and pharmacological modulators.
Main Methods:
- Utilized Piezo1 knockout transgenic mice to assess microglial function.
- Performed functional assays including migration assays towards amyloid β-protein and cytokine production assays upon lipopolysaccharide stimulation.
- Employed Piezo1-specific agonists and antagonists to modulate channel activity.
- Investigated the influence of substrate stiffness on microglial behavior.
Main Results:
- Demonstrated functional expression of Piezo1 in microglia and identified affected genes in knockout models.
- Found that Piezo1 deficiency enhanced microglial migration toward amyloid β-protein and decreased pro-inflammatory cytokine levels.
- Showed that Piezo1 activation or inhibition mimicked or reversed these effects, respectively.
- Confirmed Piezo1's role in mediating substrate stiffness-induced migration and cytokine expression.
Conclusions:
- Piezo1 is a key molecular mediator in microglia, significantly modulating their migration and immune responses.
- Targeting Piezo1 offers a potential strategy for điều chỉnh microglial activity in neurological conditions.
