Development of the circadian clock in the German cockroach, Blattella germanica.

in Sciences Citation Index(SCI), 科學引文索引資料庫(SCI)
標題Development of the circadian clock in the German cockroach, Blattella germanica.
出版類型SCI(Sciences Citation Index)
AuthorsYang, 楊永裕, 溫志仁, 阿耆娜, 蔡志偉, & How-Jing Lee 李後晶
出版日期2009 / 5

The cell distribution and immunoreactivity (ir) against period (PER), pigment dispersing factor (PDF) and corazonin (CRZ), were compared between adults and nymphs in the central nervous system of the German cockroach. Although PER-ir cells in the optic lobes (OL) were expressed in the nymphs from the first instar, the links between major clock cells became more elaborated after second/third instar. A circadian rhythm of locomotion was initiated at the fourth/fifth instar. The results suggest that the clock was running from hatching, but the control network needed more time to develop. In addition, the putative downstream regulators, PDF-ir and CRZ-ir, are co-localized in various regions of the brain,indicating potential output routes of the circadian clock. CRZ-ir cells with typical morphology of neurosecretory cells in the orsolateral protocerebrum send out three neural fibers to reach the ipsilateral corpora cardiaca (CC), the antennal lobe and two hemispheres of the protocerebrum. Based on co-localization with some PER-ir/PDF-ir cells, the CRZ-ir cells have the potential to serve as a bridge between circadian neural signals and endocrine regulation. Based on PDF’s role in the regulation of locomotion, our results support the finding that the locomotor circadian rhythm is possibly controlled by a hormonal route.

期刊名稱昆蟲生理期刊 Journal of Insect Physiology
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