Imaging analysis of the electrolyte transport and protein secretions in salivary ducts to reveal their regulatory mechanisms

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Using multiphoton microscopy, the present study established that rat salivary ductal cells exhibit spontaneous oscillations in intracellular Ca^<2+> concentration([Ca^<2+>] i). Pharmacological examinations indicate that purinergic receptors play major roles in these spontaneous Ca2+oscillations. It was also found that spontaneous elevations of[Ca^<2+>] i were well correlated with spontaneous cell swelling of ductal cells. These results indicate the possibility that the Ca^<2+> oscillations are induced by the spontaneous ATP release in salivary ductal cells in the resting state and regulate electrolyte reabsorption.