Title: Production and utilisation of glucose in the American cockroach Periplaneta americana
Abstract: The fate of radiolabelled glucose and trehalose, injected into the haemocoele of adult male cockroaches, was investigated in resting and exercising insects. Radiolabelled glucose is removed more rapidly from the haemolymph of flying insects than resting animals, but the rate of conversion of glucose to trehalose is similar under both conditions. Injection of 14C-trehalose reveals that at least 80% of the glucose that appears in the haemolymph of flying insects is derived from the hydrolysis of haemolymph-trehalose. During exercise the haemolymph-pH falls from about 7.5 to about 6.6, a figure that corresponds to the pH optimum of haemolymph-trehalose. The glucogenic capacity of incubated samples of haemolymph is increased in the presence of carbon dioxide. It is suggested that, during exercise, the provision of carbohydrate substrate to the musculature may be supplemented by extra-cellular hydrolysis of trehalose to glucose and the rapid entry of the monosaccharide into the muscle cell. Furthermore, carbon dioxide produced by actively metabolising muscle cells may serve to increase the trehalolytic capacity of the haemolymph.
Publication Year: 1977
Publication Date: 1977-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 28
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