Kainic acid induces apoptosis in neurons

Neuroscience
N A SimonianJ T Coyle

Abstract

Growing evidence suggests that non-N-methyl-D-aspartate receptor activation may contribute to neuronal death in both acute and chronic neurological diseases. The intracellular processes that mediate this form of neuronal death are poorly understood. We have previously characterized a model of kainic acid neurotoxicity using cerebellar granule cell neurons in vitro and we sought to determine the mechanism of kainic acid-induced neuronal degeneration. We found DNA laddering by agarose gel electrophoresis, cellular DNA fragmentation by in situ end labeling of DNA, and chromatin condensation using a fluorescent DNA intercalating dye, in cerebellar granule cells following exposure to kainic acid (100 microM). Aurintricarboxylic acid protected cerebellar granule cells from kainic acid-induced death. While the morphological and biochemical features of neuronal death induced by kainic acid resembled low K(+)-induced apoptosis in cerebellar granule cells, the time interval from the institution of the death promoting condition to neuronal death was shorter with kainic acid and did not require new protein or RNA synthesis. These results demonstrate that kainic acid receptor activation can induce transcription-independent apoptosis in neur...Continue Reading

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis