Glutamate-treated rat cortical neuronal cultures die in a way different from the classical apoptosis induced by staurosporine

Experimental Cell Research
J P MacManusP Morley

Abstract

The alkaloid protein kinase inhibitor staurosporine induced neuronal cell death with both the morphological and the biochemical characteristics of apoptosis. The punctate chromatin associated with apoptosis with retention of plasma membrane integrity was observed in neurons identified by colocalization of NeuN staining. Such cells had DNA fragmentation visualized by in situ end-labeling which was seen as a laddered pattern upon gel electrophoresis. In contrast cells treated with glutamate did not exhibit either of these morphological or biochemical hallmarks of apoptosis. Instead a much smaller and more compact pyknotic structure was observed associated with smeared DNA fragmentation patterns. A confocal time-lapse study of the appearance of the morphological changes in individual nuclei after staurosporine treatment showed collapse into punctate chromatin over a period of 10 min. In contrast, the collapse into small pyknotic nuclei after glutamate treatment was at least 10 times slower. It is concluded that excitotoxicity produced by glutamate did not induce cell death by an apoptotic mechanism in cultured cortical neurons.

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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