Article: Apoptosis of neuronal cells in the brains of postembryonic silkworms Bombyx mori (Lepidoptera: Bombycidae)

Key words. Silk moth, postembryonic life, brain, neuronal apoptosis, ecdysone, actinomycin, caspase

Abstract. The pattern and signal transduction of neuronal apoptosis in the brain of the silk moth, Bombyx mori, during postembryonic life, were characterized. Peak numbers of apoptotic neurons were detected in 4 day old 4th instar larvae, 9 day old 5th instar larvae and 4 day old pupae, indicating three waves of neuronal apoptosis during postembryonic development. Most of the apoptotic neurons were in the lateral portions of the brain. No apoptotic neurons were detected in 1 day old 1st instar larvae or in 7 day old pupae to 1 day old adults. Injection of 20-hydroxyecdysone (20E) into larvae ...

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