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Am J Physiol Gastrointest Liver Physiol 283: G1320-G1327, 2002; doi:10.1152/ajpgi.00256.2002
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Vol. 283, Issue 6, G1320-G1327, December 2002

Characterization of regulatory volume decrease in freshly isolated mouse cholangiocytes

Won Kyoo Cho

Department of Medicine, Division of Gastroenterology/Hepatology, Indiana University School of Medicine and The Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana 46202 - 5121

Cell volume regulation plays a vital role in many cell functions. Recent study indicates that both K+ and Cl- channels are important for the regulatory volume decrease (RVD) of cholangiocarcinoma cells, but its physiological significance is unclear due to the tumorous nature of the cells used. This present study reports the RVD of normal mouse cholangiocytes by using freshly isolated bile duct cell clusters (BDCC). A relatively simple and practical method of measuring the cross-sectional area of BDCCs by quantitative videomicroscopy was used to indirectly measure their volumes. Mouse cholangiocytes exhibited RVD, which was inhibited by 5-nitro-2'-(3-phenylpropylamino)-benzoate, DIDS, and glibenclamide, suggesting its dependence on certain chloride channels, such as volume-activated chloride channels. It is also inhibited by barium chloride but not by tetraethylammonium chloride, indicating its dependence on certain potassium channels. However, cAMP agonists had no significant effect on the RVD of BDCCs. This indirect method described can be used to study the RVD of cholangiocytes from normal as well as genetically altered mouse livers.

ion channel; quantitative videomicroscopy


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