H. Akai et al., DEVELOPMENT AND SECRETORY FUNCTION OF NEUROSECRETORY-A CELL IN BRAIN OF BOMBYX-MORI, Archives of insect biochemistry and physiology, 32(3-4), 1996, pp. 333-340
Histological and immunohistochemical observations showed that four pai
rs of neurosecretory A cells coincide with the bombyxin neuron which p
roduces the 4K-prothoracicotropic hormone (4K-PTTH). The A cells are c
haracterized by a large cytoplasmic vacuole containing homogeneous gra
nular materials, but the vacuole does not contain the bombyxin. Bombyx
in axons from the A cells are distributed on the surface of the corpus
allatum (CA), and neurosecretory granules (NSGs) are released by exoc
ytosis at earlier stages than those in other neurosecretory axons (NSA
s). Embryonic bombyxin neurons show characteristics of secretory funct
ion after the bristle formation stage (156 h after egg laying) and bec
ome the neurosecretory A cells in the larval stage. (C) 1996 Wiley-Lis
s, Inc.