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Ghrelin, along with several other hormones, has significant effects on  appetite and growth in humans and animals. The aim of our study was to  examine changes in relative growth rates, α- and β-glucosidase activities and  endocrine cell size in the midgut of 4th instar caterpillars of the pest  insect Lymantria dispar L. after ghrelin treatment. Four subpicomolar  injections of ghrelin (0.3 pmol) or physiological saline were applied every  24 h to two separate groups of fifteen caterpillars. Repeated administration  of ghrelin in subpicomolar doses elevated the relative growth rate, induced  α- and β-glucosidase activities and increased the size of endocrine cells.  The results are the first data about ghrelin effects on relative growth rate,  digestive enzyme activities and midgut endocrine cells in insects. This  information supports the use of this relatively simple model system in future  studies of mechanisms underlying digestion in complex organisms

Ghrelin effects on the activities of digestive enzymes and growth of Lymantria dispar L.