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REGULATION OF AMYLASE, CELLULASE AND CHITINASE SECRETION IN THE DIGESTIVE TRACT OF THE TWO‐SPOTTED FIELD CRICKET, Gryllus bimaculatus
Author(s) -
Weidlich Sandy,
Müller Sonja,
Hoffmann Klaus H.,
Woodring Joseph
Publication year - 2013
Publication title -
archives of insect biochemistry and physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.576
H-Index - 66
eISSN - 1520-6327
pISSN - 0739-4462
DOI - 10.1002/arch.21092
Subject(s) - amylase , biology , gryllus bimaculatus , secretion , moulting , cellulase , medicine , endocrinology , chitinase , stimulation , enzyme , biochemistry , cricket , ecology , larva
The secretion of amylase and cellulase in G ryllus bimaculatus is determined by increased food intake, whereby shortly after molting food consumption increases. About half of the standing amylase concentration (activity) in the endothelial cells can be secreted within 30 min. The peak of amylase and cellulase secretion that occurs in the photophase is related to the feeding peak in the previous scotophase. The secretion of chitinase on the other hand is primarily controlled by the molting cycle. Only amylase secretion was affected by calcium in the incubation medium, suggesting an apocrine release mechanism. Refeeding experiments (after 5 days without food) suggest that the release of amylase in response to a nutrient in the lumen (glucose) is not due to simple stimulation of exocytosis, but rather a stimulation of synthesis.