Kainic Acid-Induced Neurotoxicity Mechanisms in Central Nervous System

Kainic acid is a potent analogue of the excitatory neurotransmitter glutamate that selectively activates ionotropic kainate receptors in the central nervous system. Upon administration, sustained receptor stimulation leads to excessive calcium influx, disruption of intracellular homeostasis and mitochondrial dysfunction. This cascade induces the generation of reactive oxygen species and endoplasmic reticulum stress, triggering proteolytic enzyme activation and lipid peroxidation. Concurrently, astrocytes and microglia become activated, releasing pro-inflammatory mediators and further amplifying neuronal injury. The hippocampus is particularly susceptible, with pyramidal and dentate granule cells undergoing synaptic remodelling, dendritic retraction and eventual apoptosis or necrosis. Within experimental models, kainic acid reproduces key features of temporal lobe epilepsy and provides insight into excitotoxic processes implicated in neurodegenerative disorders, including Alzheimer’s disease and amyotrophic lateral sclerosis. Understanding these mechanisms has guided the development of neuroprotective strategies aimed at modulating receptor function, attenuating oxidative stress and limiting glial activation to preserve synaptic integrity and neuronal viability.

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Technical terms

Excitotoxicity: A pathological process in which overstimulation of glutamate receptors leads to neuronal injury and death.

Kainate receptors: Ionotropic glutamate receptors selectively activated by kainic acid, mediating sodium and calcium influx.

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen that can damage lipids, proteins and DNA.

Neuroinflammation: Activation of glial cells and release of cytokines that exacerbate neuronal damage.

Synaptosome: Isolated nerve terminal preparation used to study presynaptic neurotransmitter release mechanisms.

References

1. Gypenoside XVII Reduces Synaptic Glutamate Release and Protects against Excitotoxic Injury in Rats. Biomolecules (2024).
2. Effects of Troxerutin on Oxidative Stress, Inflammation and Galectin- 3 Expression in Intracerebroventricular Kainic Acid-Induced Neurotoxicity. Inflammation (2025).
3. Kainic Acid‐Induced Neurodegenerative Model: Potentials and Limitations. BioMed Research International (2010).