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Monitoring Astrocyte Reactivity and Proliferation in Vitro Under Ischemic-Like Conditions
Published on: October 21, 2017
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Acid-Sensing PAC Channel Promotes Astrocyte Acidosis in Ischemic Stroke.
Yifei Liu1, Yun Zhang2, Meng Sun2
1State Key Laboratory of Chemical Biology, Shanghai Institute of Materia Medica, Chinese Academy of Science, Shanghai, China.
Glia
|July 28, 2025
Summary
The proton-activated chloride (PAC) channel in astrocytes contributes to brain damage after ischemic stroke. Blocking this channel in astrocytes offers a potential neuroprotective strategy for stroke treatment.
Area of Science:
- Neuroscience
- Molecular Biology
- Pathology
Background:
- Astrocytes play a key role in central nervous system homeostasis and disease.
- The mechanisms by which astrocytes detect environmental changes like acidosis during ischemic stroke are not fully understood.
Purpose of the Study:
- To investigate the role of proton-activated chloride (PAC) channels in astrocytes during ischemic stroke.
- To determine if PAC channels mediate astrocyte responses to acidosis and oxidative stress.
Main Methods:
- Utilized a mouse model of ischemic stroke (MCAO/R).
- Generated conditional knockout mice lacking PAC channels specifically in astrocytes.
- Analyzed infarct volume, astrocyte apoptosis (Akt/Bax/Caspase 3 pathway), and inflammatory mediator release.
Main Results:
- PAC channels are expressed in brain glial cells and mediate acid-induced chloride influx.
- Conditional knockout of PAC channels in astrocytes, but not microglia, significantly reduced infarct volume.
- PAC channel activation in astrocytes promotes apoptosis and inflammatory mediator release under conditions of pH oscillation and oxidative stress.
Conclusions:
- PAC channels in astrocytes are crucial mediators of brain damage in ischemic stroke.
- Targeting PAC channels in astrocytes presents a promising therapeutic avenue for neuroprotection in stroke.
