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Published on: July 10, 2018
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Licochalcone A attenuates NMDA-induced neurotoxicity
Jae Soo Kim1, Mi-Hye Kim1, Myeung Ju Kim2
1Department of Medical Laser, Graduate School, Dankook University, Cheonan, Republic of Korea.
Animal Cells and Systems
|August 14, 2024
Summary
Licochalcone A (Lico-A) protects rat neurons from NMDA-induced damage by improving cell survival and synaptic health. This flavonoid also inhibits necroptosis and reduces harmful glial cell activation, offering neuroprotection.
Area of Science:
- Neuroscience
- Pharmacology
- Cell Biology
Background:
- N-methyl-D-aspartate (NMDA) receptor overactivation causes excitotoxicity, a key factor in neuronal damage in various neurological disorders.
- Licochalcone A (Lico-A), a natural flavonoid from licorice root, possesses known anti-inflammatory, antioxidant, and anti-cancer properties.
Purpose of the Study:
- To investigate the neuroprotective potential of Lico-A against NMDA-induced neurotoxicity in primary cultured rat hippocampal neurons.
- To elucidate the mechanisms underlying Lico-A's protective effects, including synaptic integrity, necroptosis inhibition, and glial response modulation.
Main Methods:
- Primary rat hippocampal neurons were exposed to NMDA with or without Lico-A treatment.
- Cell viability was assessed using standard assays.
- Synaptic changes were evaluated by imaging postsynaptic density 95 (PSD95) and synaptophysin.
- Western blotting was used to measure levels of phosphorylated mixed lineage kinase domain-like pseudokinase (P-MLKL) and phosphorylated receptor-interacting serine/threonine-protein kinase 3 (P-RIP3).
- Immunostaining for glial fibrillary acidic protein (GFAP), ionized calcium-binding adaptor molecule 1 (IBA-1), and tumor necrosis factor alpha (TNF-α) assessed astrocyte and microglia activation.
Main Results:
- Lico-A (2.5 μg/ml) significantly enhanced neuronal survival against NMDA-induced toxicity.
- Lico-A treatment preserved synaptic structures, indicated by increased PSD95 and synaptophysin puncta, unlike NMDA exposure alone.
- NMDA exposure increased P-MLKL and P-RIP3 levels, indicative of necroptosis, which were reduced by Lico-A.
- Lico-A significantly reduced the NMDA-induced upregulation of GFAP, IBA-1, and TNF-α, suggesting modulation of glial activation.
Conclusions:
- Lico-A demonstrates significant neuroprotective effects against NMDA-induced neurotoxicity in hippocampal neurons.
- The protective mechanisms involve maintaining synaptic integrity, inhibiting neuronal necroptosis, and suppressing excessive glial activation.
- Lico-A holds promise as a therapeutic agent for neurological conditions involving NMDA receptor-mediated excitotoxicity.
