Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8348055 | Peptides | 2015 | 7 Pages |
Abstract
Insect sulfakinins are multifunctional neuropeptides homologous to vertebrate gastrin/cholecystokin (CCK) neuropeptide hormones. We investigated the action of the nonsulfated sulfakinin Zopat-SK-1 (pETSDDYGHLRFa) on the levels of chosen metabolites in the Zophobas atratus beetle fat body. Samples of fat body were collected 2Â h and 24Â h after hormone injection. The administration of 20Â pmol of Zopat-SK-1 to feeding larvae significantly increased concentrations of lipids and proteins and decreased the content of glycogen in fat body tissue in the 24Â h experimental group. In contrast, the only increase in total lipid concentration in prepupal fat bodies was observed 24Â h after Zopat-SK-1 treatment. Simultaneously, changes in the quality and quantity of free sugars in the hemolymph were measured. In larval hemolymph, a marked increase in free sugar concentration and a decrease in glucose content were observed 24Â h and 2Â h after Zopat-SK-1 application, respectively. No changes in the prepupal stage were observed. For the first time we show potent metabolic activity of sulfakinin in the fat body tissue of an insect. Our findings imply a physiological function of the nonsulfated form of sulfakinin in energy storage and release processes in fat body tissue of larvae and prepupae was indicated. We suggest a role for sulfakinin signaling in the regulation of energy metabolism in insect tissues.
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Authors
Malgorzata Slocinska, Pawel Marciniak, Wieslawa Jarmuszkiewicz, Grzegorz Rosinski,