| Abstract: | Cholecystokinin and analogues increased the uptake of 2-deoxy-D-glucose and 3-O-methylglucose into isolated mouse pancreatic acini. This uptake was mediated by a facilitated glucose transport system that was saturable, stereospecific, and was inhibited by both phloretin and cytochalasin B. In agreement with previous studies of acinar function, caerulein was more potent and pentagastrin less potent than cholecystokinin in increasing sugar transport. The cholinergic analogue carbachol mimicked the effect of caerulein; atropine completely abolished the effects of carbachol but was without influence on the effects of the polypeptide hormones. In contrast, secretion, as well as dibutyryl cyclic AMP and dibutyryl cyclic GMP, had no effect on 2-deoxy-D-glucose uptake. Two lines of evidence suggested that hormonal stimulation of this sugar transport system was related to mobilization of cellular Ca2+. First, depletion of cellular Ca2+ by incubation of acini with ethylene glycol bis(beta-aminoethyl ether) N,N,N',N'-tetraacetic acid (EGTA) reduced the effect of caerulein. Second, the Ca2+ ionophore A23187 mimicked the effects of caerulein on 2-deoxy-D-glucose uptake when Ca2+ was present in the medium. |
