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Compartmentalized cAMP signalling in regulated exocytic processes in non-neuronal cells

机译:在非神经元细胞的受调控胞外过程中间隔化的cAMP信号传导

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Cyclic adenosine monophosphate (cAMP) is a central second messenger controlling a plethora of vital functions. Studies of cAMP dynamics in living cells have revealed markedly inhomogeneous concentrations of the second messenger in different compartments. Moreover, cAMP effectors such as cAMP-dependent protein kinase (PKA) and cAMP-activated GTP-exchange factors (Epacs) are tethered to specific cellular sites. Both the tailoring of cAMP concentrations, and the activities of cAMP-dependent signalling systems at specific cellular locations are prerequisites for most, if not all, cAMP-dependent processes. This review focuses on the role of compartmentalized cAMP signalling in exocytic processes in non-neuronal cells. Particularly, the insertion of aquaporin-2 into the plasma membrane of renal principal cells as an example for a cAMP-dependent exocytic process in a non-secretory cell type, renin secretion from juxtaglomerular cells as a cAMP-triggered exocytosis from an endocrine cell, insulin release from pancreatic beta-cells as a Ca2+-mediated and cAMP-potentiated exocytic processes in an endocrine cell, and cAMP- or Ca2+-triggered H+ secretion from gastric parietal cells as an exocytic process in an exocrine cell are discussed. The selected examples of cAMP-regulated exocytic pathways are reviewed with regard to key proteins involved: adenylyl cyclases, phosphodiesterases, PKA, A kinase anchoring proteins (AKAPs) and Epacs. (C) 2007 Elsevier Inc. All rights reserved.
机译:环状磷酸腺苷(cAMP)是控制过多生命机能的中央第二信使。对活细胞中cAMP动态的研究表明,第二信使在不同隔室中的浓度明显不均匀。此外,cAMP效应物(例如cAMP依赖性蛋白激酶(PKA)和cAMP激活的GTP交换因子(Epacs))被拴在特定的细胞部位。 cAMP浓度的调整以及cAMP依赖的信号系统在特定细胞位置的活动都是大多数(即使不是全部)cAMP依赖过程的前提。这项审查集中在非神经元细胞的胞外过程中间隔cAMP信号传导的作用。特别是,将aquaporin-2插入肾脏原代细胞的质膜中,以作为非分泌型细胞类型中cAMP依赖性外泌过程的一个例子,从近肾小球细胞分泌的肾素作为cAMP触发的内分泌细胞分泌,讨论了胰岛β细胞作为内分泌细胞中的Ca2 +介导的和cAMP增强的外分泌过程释放的胰岛素,以及胃壁细胞中cAMP或Ca2 +触发的H +分泌作为外分泌细胞中的外分泌过程。关于涉及的关键蛋白,综述了cAMP调控的胞外途径的一些实例:腺苷酸环化酶,磷酸二酯酶,PKA,A激酶锚定蛋白(AKAP)和Epacs。 (C)2007 Elsevier Inc.保留所有权利。

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