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Na-K-Cl cotransporter contributes to glutamate-mediated excitotoxicity
Joe Beck1, Brett Lenart, Douglas B Kintner
1Department of Neurological Surgery, University of Wisconsin Medical School, Madison, Wisconsin 53792, USA.
Summary
The Na-K-Cl cotransporter isoform 1 (NKCC1) contributes to neuronal death during cerebral ischemia. Blocking NKCC1 prevents excitotoxicity and cell swelling, but this effect is age-dependent.
Area of Science:
- Neuroscience
- Cell Biology
- Physiology
Background:
- Cerebral ischemia disrupts ion homeostasis, leading to neuronal death.
- The cation-dependent chloride transporter, Na-K-Cl cotransporter isoform 1 (NKCC1), is implicated in ion balance.
Purpose of the Study:
- To investigate the role of NKCC1 in neurotoxicity induced by glutamate and oxygen-glucose deprivation (OGD).
- To determine if inhibiting NKCC1 can protect neurons from excitotoxicity.
Main Methods:
- Cortical neurons were subjected to glutamate exposure or OGD.
- Neurotoxicity was assessed with and without NMDA receptor antagonists (dizocilpine) and NKCC1 inhibitors (bumetanide).
- Intracellular ion content, cell swelling, and cell death were measured.
Main Results:
- Glutamate and OGD induced significant neuronal death, which was prevented by dizocilpine and bumetanide.
- Bumetanide blocked intracellular Na+ and Cl- accumulation and attenuated cell swelling.
- NKCC1 inhibition protected mature neurons (14-15 DIV) but not younger neurons (7-8 DIV).
Conclusions:
- NKCC1 activity contributes to acute excitotoxicity in cerebral ischemia by promoting Na+ and Cl- influx.
- Inhibition of NKCC1 offers neuroprotection against excitotoxicity in mature neurons.
- The neuroprotective effect of NKCC1 inhibition is dependent on neuronal developmental stage.