The effect of adipokinetic hormone on midgut characteristics in Pyrrhocoris apterus L. (Heteroptera)

Digestive processes and the effect of adipokinetic hormone (Pyrap-AKH) on the amount of nutrients (lipids, proteins, and carbohydrates), and on the activity of digestive enzymes (lipases, peptidases, and carbohydrases) were studied in the midgut of the firebug, Pyrrhocoris apterus. The analyses were...

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Bibliographic Details
Published in:Journal of insect physiology 2012, Vol.58 (1), p.194-204
Main Authors: Kodrík, Dalibor, Vinokurov, Konstantin, Tomčala, Aleš, Socha, Radomír
Format: Article
Language:English
Subjects:
absorption
Adipokinetic hormone
AKH
Amylases - metabolism
Animals
Carbohydrate Metabolism
carbohydrates
diacylglycerols
Dietary Proteins - metabolism
Digestion
Enzyme activity
ESI-MS
fatty acids
Feeding Behavior
Female
foods
Gastrointestinal Tract - enzymology
Heteroptera - metabolism
ingestion
Insect Hormones - metabolism
Lipase - metabolism
Lipid Metabolism
Midgut
nutrients
Oligopeptides - metabolism
peptidases
Peptide Hydrolases - metabolism
proteins
Pyrrhocoris apterus
Pyrrolidonecarboxylic Acid - analogs & derivatives
Pyrrolidonecarboxylic Acid - metabolism
triacylglycerol lipase
triacylglycerols
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Summary:Digestive processes and the effect of adipokinetic hormone (Pyrap-AKH) on the amount of nutrients (lipids, proteins, and carbohydrates), and on the activity of digestive enzymes (lipases, peptidases, and carbohydrases) were studied in the midgut of the firebug, Pyrrhocoris apterus. The analyses were performed on samples of anterior (AM), middle (MM) and posterior (PM) midgut parts. The results revealed that the digestion of lipids, carbohydrates and proteins take place in the acidic milieu. The Pyrap-AKH treatment increased significantly the level of lipids and proteins in the midgut, and also the level of triacylglycerols (TGs) predominantly in the AM, and the level of diacylglycerols (DGs) in the MM. The increase was not uniform for all present TG and DG species – those containing the linoleic fatty acid were predominant. No hormonal effect on lipase activity was recorded, while peptidase and glucosidase activity was increased in the MM and PM. All these facts indicate that the Pyrap-AKH probably stimulates digestion by more intensive food ingestion or turnover, and perhaps by the stimulation of metabolite absorption; the activation of digestive enzymes seems to be secondary or controlled by other mechanisms.
ISSN:0022-1910
1879-1611
DOI:10.1016/j.jinsphys.2011.11.010