NDLI: Orcokinin immunoreactivity in the accessory medulla of the cockroach Leucophaea maderae

Content Provider	Springer Nature Link
Author	Hofer, Sabine Homberg, Uwe
Copyright Year	2006
Abstract	The accessory medulla is the master circadian clock in the brain of the cockroach Leucophaea maderae and controls circadian locomotor activity. Previous studies have demonstrated that a variety of neuropeptides are prominent neuromediators in this brain area. Recently, members of the orcokinin family of crustacean neuropeptides have been identified in several insect species and shown to be widely distributed in the brain, including the accessory medulla. To investigate the possible involvement of orcokinins in circadian clock function, we have analyzed the distribution of orcokinin immunostaining in the accessory medulla of L. maderae in detail. The accessory medulla is densely innervated by approximately 30 orcokinin-immunoreactive neurons with cell bodies distributed in five of six established cell groups in the accessory medulla. Immunostaining is particularly prominent in three ventromedian neurons. These neurons have processes in a median layer of the medulla and in the internodular neuropil of the accessory medulla and send axonal fibers via the posterior optic commissure to their contralateral counterparts. Double-labeling experiments have revealed the colocalization of orcokinin immunostaining with immunoreactivity for pigment-dispersing hormone, FMRFamide, Mas-allatotropin, and γ-aminobutyric acid in two cell groups of the accessory medulla, but not in the ventromedian neurons or in the anterior and posterior optic commissure. Immunostaining in the ventromedian neurons suggests that orcokinin-related peptides play a role in the heterolateral transmission of photic input to the pacemaker and/or in the coupling of the bilateral pacemakers of the cockroach.
Starting Page	589
Ending Page	600
Page Count	12
File Format	PDF
ISSN	0302766X
Journal	Cell and Tissue Research
Volume Number	325
Issue Number	3
e-ISSN	14320878
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-04-21
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Peptides Immunocytochemistry Brain Circadian rhythms Pigment-dispersing hormone Cockroach, Leucophaea maderae (Insecta) Proteomics Molecular Medicine Human Genetics
Content Type	Text
Resource Type	Article
Subject	Cell Biology Histology Pathology and Forensic Medicine

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