Abstract
The effect of β-ecdysone injection or prothoracic gland removal on the neurosecretory brain cells in the cabbage armyworm, Mamestra brassicae was investigated. The prothoracic gland removal of the 6-day-old last instar larvae induced the release of stainable neurosecretory material from type II cells in the pars intercerebralis 24 hr after treatment. The injection of β-ecdysone into the prothoracic gland-extirpared larva stimulated both the synthesis of stainable material in the type II cells and transportation of stainable material from neurosecretory cells to axon tracts. These results suggest that ecdysone may have a rôle as a positive feedback regulator for the synthesis and release of prothoracicotropic hormone in M. brassicae brain.
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