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标题：The ryanodine receptor mediates early zymogen activation in pancreatitis
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作者：Sohail Z. Husain ; Priyajit Prasad ; Wayne M. Grant 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2005
卷号：102
期号：40
页码：14386-14391
DOI：10.1073/pnas.0503215102
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Acute pancreatitis is characterized by the pathologic activation of zymogens within pancreatic acinar cells. The process requires a rise in cytosolic Ca2+ from undefined intracellular stores. We hypothesized that zymogen activation is mediated by ryanodine receptor (RYR)-regulated Ca2+ release, because early zymogen activation takes place in a supranuclear compartment that overlaps in distribution with the RYR. Ca2+ signals in the basolateral, but not apical, region of acinar cells observed during supraphysiologic agonist stimulation were dependent on RYR Ca2+ release. Inhibition of RYR or depletion of RYR-sensitive Ca2+ pools each reduced pathologic zymogen activation in isolated acinar cells, but neither treatment affected amylase secretion. Inhibition of RYR also inhibited zymogen activation in vivo. We propose that Ca2+ release from the RYR mediates zymogen activation but not enzyme secretion. The findings imply a role for the RYR in acute pancreatitis.
关键词：pancreatic acinar cell ; dantrolene ; calcium signaling