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Novel insect orcokinins: characterization and neuronal distribution in the brains of selected dicondylian insects.
Department of Biology, University of Marburg, D-35032 Marburg, Germany.
Stockholm University, Faculty of Science, Department of Zoology, Functional Morphology.ORCID iD: 0000-0001-7815-4868
Stockholm University, Faculty of Science, Department of Analytical Chemistry.
Department of Biology, University of Marburg, D-35032 Marburg, Germany.
2005 (English)In: Journal of Comparative Neurology, ISSN 0021-9967, E-ISSN 1096-9861, Vol. 490, no 1, 57-71 p.Article in journal (Refereed) Published
Abstract [en]

Orcokinins are a family of myotropic neuropeptides identified in various decapod crustaceans and recently in a cockroach. Their presence in the crustacean nervous system and hemolymph suggests that they act as hormones and as locally acting neuromodulators. To provide further evidence for the existence of orcokinins in insects, we identified a novel orcokinin-related peptide in the locust Schistocerca gregaria and used an antiserum against Asn13-orcokinin for immunostaining in the brains of selected dicondylian insects, including a silverfish, three polyneopteran species (a cockroach and two locusts), and three endopterygote species (a moth, a bee, and a fly). As analyzed by MALDI-TOF spectrometry and nanoelectrospray Q-TOF, the locust orcokinin is a novel tetradecapeptide with striking sequence similarity to crustacean orcokinins. Orcokinin immunostaining was widespread and occurred in similar patterns in the brain of the silverfish and the polyneopteran species. Prominent immunostaining was detected in the optic lobe, especially in the medulla and in the accessory medulla, in local interneurons of the antennal lobe, and in extrinsic and intrinsic mushroom-body neurons. All parts of the central complex and many other areas of the brains were densely stained. In the silverfish, the cockroach, and the locusts, processes in the corpora cardiaca showed orcokinin immunoreactivity, suggesting that orcokinins also serve a hormonal role. In contrast to the case in polyneopteran species, immunostaining was completely lacking in the brains of the honeybee, fruitfly, and sphinx moth. This indicates that orcokinins either are modified considerably or may be completely absent in the brains of endopterygote insects.

Place, publisher, year, edition, pages
Wiley , 2005. Vol. 490, no 1, 57-71 p.
Keyword [en]
neuropeptides • insect brain • Leucophaea maderae • Schistocerca gregaria • Lepisma saccharina
National Category
Biological Sciences
URN: urn:nbn:se:su:diva-26639DOI: 10.1002/cne.20650PubMedID: 16041719OAI: diva2:210791
Available from: 2009-04-06 Created: 2009-04-06 Last updated: 2014-10-13Bibliographically approved

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Dircksen, Heinrich
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Functional MorphologyDepartment of Analytical Chemistry
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