Abstract
The frontal ganglion (FrG) in insects contributes to the modulation of feeding behavior via the regulation of foregut contraction and other neural networks. Profiling the peptides of the FrG is important to understand endocrine regulation of feeding behavior in insects. High-resolution spiral matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) identified an ion peak, corresponding to calcitonin-like diuretic hormone 31 (CT/DH) in the FrG of silkworm Bombyx mori larvae. RT-PCR confirmed that CT/DH is expressed in the FrG, as are other peptide hormones, including allatoregulatory peptides. A feeding latency assay using synthetic CT/DH revealed that it increases the time to the initiation of feeding in a dose-dependent manner. These data indicate that CT/DH is a candidate regulatory peptide that modulates the feeding behavior of B. mori.
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