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Projection of FMRFamide-like neuropeptide-producing neurosecretory cells from silkworm brain into ventral nerve cord and retrocerebral complex

Published online by Cambridge University Press:  01 May 2012

Bo Yong Kim
Affiliation:
School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
Hwa Young Song
Affiliation:
School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
Mi Young Kim
Affiliation:
School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
Pil Don Kang
Affiliation:
Department of Agricultural Biology, National Institute of Agricultural Science and Technology, Suweon 441-100, Korea
Min Ho Cha
Affiliation:
Department of Medical Research, Korea Institute of Oriental Medicine, Daejeon 305-811, Korea
Hun Hee Park
Affiliation:
Department of Clinical Laboratory Sciences, Ansan University, Ansan 426-701, Korea
Seung Gwan Lee
Affiliation:
Department of Clinical Laboratory Sciences, College of Health Science, Korea University, Seoul 136-701 Korea
Chang Kyou Lee
Affiliation:
Department of Clinical Laboratory Sciences, College of Health Science, Korea University, Seoul 136-701 Korea
Chai Hyeock Yu
Affiliation:
Department of Biological Sciences, Inha University, Incheon 402-751, Korea
Bong Hee Lee
Affiliation:
School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea
Corresponding
E-mail address:

Abstract

Using immunostaining methodology, we traced the axonal projection of FMRFamide (Phe-Met-Arg-Phe-NH2)-like immunoreactive (LI) medial neurosecretory cells (MNCs) and lateral neurosecretory cells (LNCs) from the brain into the ventral nerve cord (VNC) and retrocerebral complex in Bombyx mori (L.) (Lepidoptera: Bombycidae). Of the seven pairs of FMRFamide-LI MNCs, one pair extended its axons from the brain pars intercerebralis into the VNC ipsilateral connective where they appeared to terminate. The axons of the remaining MNCs ran through decussation in the brain median region and contralateral nervi corporis cardiaci (NCC) I out of the brain, and eventually innervated the contralateral corpus cardiacum (CC). Axons from the single pair of FMRFamide-LI LNCs projected into the ipsilateral NCC II fused with NCC I without decussation in the brain, and finally terminated in the CC. These results suggest that transport of the FMRFamide-like neuropeptide from may be related to the modulation of functions such as gut contraction in MNCs terminating in the VNC, and regulation of production and/or secretion of specific hormones such as juvenile hormone in MNCs and LNCs terminating in the CC.

Résumé

Utilisant une méthodologie immunostaining, nous avons retracé la projection axonale des FMRFamide (Phe-Met-Arg-Phe-NH2)-like immunoréactive médial cellules neurosécrétrices (medical neurosecretory cells; MNCs) et de latérales cellules neurosécrétrices (Lateral neurosecretory cells; LNCs) à partir de le cerveau dans le corde nerveuse ventrale et retrocerebral complexes dans Bombyx mori (L.) (Lepidoptera: Bombycidae). les 7 paires de FMRFamide MNC, 1 paire axone du cerveau pars intercerebralis dans le VNC connectivites ipsilatérale où ils sont apparus á la fin. Les axones des MNC a couru dans la région du cerveau médian et controlatéral nervi corporis cardiaci (NCC), je hors du cerveau, et innervées du controlatéral corps cardiacum (CC). Les axones de la seule paire de FMRFamide LNC projetés dans le ipsilatérale NCC IIfusionné avec NCCI sans décussation dans le cerveau et se termine dans le CC. Ces résultats suggèrent que le transport des FMRFamide-comme le neuropeptide partir peut être liée à la modulation des fonctions telles que l'intestin contraction dans MNC de terminaison dans le VNC, et la régulation de la production et / ou la sécrétion de certaines hormones tels que juvenile hormone chez les MNC et les LNC se terminant par le CC.

Type
Original Article
Copyright
Copyright © Entomological Society of Canada 2012

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Projection of FMRFamide-like neuropeptide-producing neurosecretory cells from silkworm brain into ventral nerve cord and retrocerebral complex
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