Origin of trehalose in stress-induced hyperglycaemia in the american cockroach, Periplaneta americana

Abstract

The time course of stress-induced hyperglycaemia was determined in adult male Periplaneta americana, and a rapid elevation of haemolymph trehalose concentration is reported. Intracellular fat body trehalose concentrations were measured in the resting insect and found to be equivalent to haemolymph trehalose levels. In active insects, the apparent intracellular fat body trehalose concentration is greater than that of the haemolymph, and is dependent upon the time taken for dissection. The rate of production of trehalose in isolated fat body is equivalent to the rate of appearance of haemolymph trehalose in hyperglycaemia.