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The location of purinoceptors in the pancreatic duct and their role in regulating ductal secretion have been investigated by applying ATP and UTP to basolateral and luminal surfaces of pancreatic ducts isolated from the guinea-pig pancreas.
Changes in intracellular Ca2+ concentration were measured by microfluorometry in microperfused interlobular duct segments. Fluid and HCO3- secretion were estimated by monitoring luminal pH and luminal volume in sealed duct segments microinjected with BCECF-dextran.
Both ATP and UTP (1 µM) caused biphasic increases in intracellular Ca2+ concentration in pancreatic duct cells when applied to either the basolateral or luminal membrane.
Luminal application of both ATP and UTP evoked fluid and HCO3- secretion. The maximum response to 1 µM ATP or UTP was about 75 % of that evoked by secretin. By contrast, basolateral application of ATP or UTP inhibited spontaneous secretion by 52 % and 73 %, respectively, and secretin-evoked secretion by 41 % and 38 %, respectively.
The data suggest that luminal nucleotides may act in an autocrine or paracrine fashion to enhance ductal secretion while basolateral nucleotides, perhaps released from nerve terminals, may have an inhibitory effect. The fact that both apical and basolateral purinoceptors elevate intracellular Ca2+, but that they have opposite effects on secretion, suggests that additional signalling pathways are involved.
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