• Korean Journal of Clinical Laboratory Science
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• v.48 no.2
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• pp.153-157
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• 2016

Although the adenosine triphosphate (ATP) efflux pathway is thought to play a major regulatory role in RVD in some cells, including cholangiocarcinoma cells, the role of ATP in regulatory volume decrease (RVD) of normal cholangiocytes is not well defined. Thus, this study was conducted to investigate the role of extra cellular ATP and ATP pathways of BDCCs isolated from normal mice. Changes in cell volume of BDCCs were indirectly assessed by measurement of the cross-sectional area (CSA) by quantitative videomicroscopy. The relative CSA of BDCCs from normal mice increased with hypotonic maneuver to $1.20{\pm}0.02$ (n=20) within 10 min, but decreased to $1.06{\pm}0.03$ at 40 min. Administration of ATP, ATP hydrolase apyrase or the P2 receptor blocker suramin during RVD had no significant effects compared with untreated controls. In addition, treatment with the PKC inhibitors, Bisindolamide I and Ro 31-8220, during RVD had no significant effects when compared with untreated controls. These results indicate that unlike the results from cholangiocarcinoma cells, ATP plays no significant role in the RVD of normal mouse cholangiocytes.