Ultradian Firing Rhythm of Neurosecretory Cells Producing an Insulin-related Peptide in the Silkmoth Bombyx mori(Neurobiology)
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概要
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There are four pairs of neurosecretory cells producing bombyxin, an insulin-related peptide, in the brain of Bombyx mori. In the present study, electrical signals of the bombyxin-producing cells were identified and short- and long-term activity patterns of the cells throughout the pupal period were analyzed. Activity pattern of the cells was characterized by periodic discharges of a volley of action potentials. Periodicity of the electrical activity depended on the temperature and mean±SD of periods was 34.7±4.8 min at 26℃. Four cells in a brain hemisphere were functionally heterogeneous : individual cells had specific activity amplitudes and rhythms, thereby suggesting that an ultradian activity rhythm of a cell originates from its intrinsic pacemaker activity. There was no significant diel (circadian) oscillation in the electrical activity. Daily activity patterns had a maximum at an early stage (day-2 or 3) of pupal period. Periodic secretion of bombyxin, like insulin, seems to be an efficient temporal pattern for hormonal actions.
- 社団法人日本動物学会の論文
- 2001-03-10
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