Participation of Cathepsins B, H, and L in Perikaryal Condensation of CA1 Pyramidal Neurons Undergoing Apoptosis After Brief Ischemia
The CA1 pyramidal neurons in the hippocampus are known to be selectively vulnerable to brief ischemia of the global cerebrum, resulting in delayed neuronal death several days after ischemic insult (Ito et al., 1975; Pulsinellie et al., 1979;Kirino, 1982;Kirino andSano, 1984a, b; Petito et al., 1987;Bonnekoh et al., 1990). It remains, however, unknown whether this delayed neuronal death is necrosis or apoptosis. According to the morphological criteria of apoptosis, dying cells show chromatin condensation and cell shrinkage, followed by heterophagocytosis (Kerr et al, 1987; Clarke, 1990). In the course of the study of the delayed death of the CA1 pyramidal neurons after transient ischemia, we noticed that shrinkage of these neurons suddenly occurs 3 or 4 days after ischemic insult. This suggests the possibility that delayed death of the CA1 pyramidal neurons after brief ischemia is not necrotic but apoptotic.
KeywordsPyramidal Neuron Cysteine Proteinase Ischemic Insult Autophagic Vacuole Immunogold Particle
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