Calcium signaling in pancreatic ductal epithelial cells: An old friend and a nasty enemy

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• 作者：Jó ; zsef Malé ; th^a ; ^b ; Pé ; ter Hegyi^a ; ^{hegyi.peter@med.u-szeged.hu" class="auth_mail} ; ^{hegyi2009@gmail.com" class="auth_mail}
• 关键词：Pancreatic ductal secretion ; Epithelial Ca2+ signaling ; Exocrine pancreas
• 刊名：Cell Calcium
• 出版年：June 2014
• 年：2014
• 卷：55
• 期：6
• 页码：337-345
• 全文大小：2325 K

文摘

Ductal epithelial cells of the exocrine pancreas secrete HCO₃⁻ rich, alkaline pancreatic juice, which maintains the intraluminal pH and washes the digestive enzymes out from the ductal system. Importantly, damage of this secretory process can lead to pancreatic diseases such as acute and chronic pancreatitis. Intracellular Ca²⁺ signaling plays a central role in the physiological regulation of HCO₃⁻ secretion, however uncontrolled Ca²⁺ release can lead to intracellular Ca²⁺ overload and toxicity, including mitochondrial damage and impaired ATP production. Recent findings suggest that the most common pathogenic factors leading to acute pancreatitis, such as bile acids, or ethanol and ethanol metabolites can evoke different types of intracellular Ca²⁺ signals, which can stimulate or inhibit ductal HCO₃⁻ secretion. Therefore, understanding the intracellular Ca²⁺ pathways and the mechanisms which can switch a good signal to a bad signal in pancreatic ductal epithelial cells are crucially important. This review summarizes the variety of Ca²⁺ signals both in physiological and pathophysiological aspects and highlight molecular targets which may strengthen our old friend or release our nasty enemy.