Firing activities of neurosecretory cells producing diapause hormone and its related peptides in the female silkmoth,Bombyx mori. II. mandibular and maxillary cells |
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Authors: | Ichikawa Toshio Kamimoto Satoshi |
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Institution: | Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan. tichiscb@mbox.nc.kyushu-u.ac.jp |
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Abstract: | A gene encoding a precursor polyprotein of diapause hormone (DH) and four related peptides is expressed by three groups of neurosecretory cells in the suboesophageal ganglion (SOG) of Bombyx mori. Long-term chronic recordings of firing activities were made from a common axonal tract (the maxillary nerve) of two groups of cells localized in the mandibular and maxillary neuromeres of SOG during pupal-adult development. Mandibular and maxillary cells usually produced a cluster of action potentials at an interval of 30-60 min during pupal-adult development and there was no significant difference in the firing activity profile between diapause-egg and non-diapause-egg producers. We suggest that rather than DH secretion, pupal mandibular and maxillary cells are involved in the secretion of DH-related neuropeptides. DH secretion seems to be assigned to the third group of cells (labial cells); hence, there may be different posttranslational processing of the precursor polyprotein in different neurosecretory cell groups. |
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