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Lamellar Body Exocytosis by Cell Stretch or Purinergic Stimulation: Possible Physiological Roles, Messengers and Mechanisms

机译:通过细胞拉伸或嘌呤能刺激的片状体胞吐作用:可能的生理作用,信使和机制。

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摘要

A major function of the pulmonary alveolar type II cell is the secretion of surfactant, a lipoprotein-like substance, via exocytosis of secretory vesicles termed lamellar bodies (LBs). The process of surfactant secretion is remarkable in several aspects, considering stimulus-delayed fusion activity, poor solubility of vesicle contents, long hemifusion lifetimes, slow fusion pore expansion and active, actin-driven content release. Cell stretch as well as P2Y(2) receptor stimulation by extracellular ATP are considered the most potent stimuli for LB exocytosis. For both stimuli, elevation of the cytoplasmic Ca2+ concentration [Ca2+](c) is a key step. This review summarizes possible physiological roles and pathways of stretch-or ATP-induced surfactant secretion and discusses molecular mechanisms controlling the pre-, hemi- and postfusion phase, in comparison with neuroendocrine release mechanisms.
机译:II型肺泡细胞的主要功能是通过称为层状体(LBs)的分泌性囊泡的胞吐作用来分泌表面活性剂(一种脂蛋白样物质)。考虑到刺激延迟的融合活性,囊泡内容物的溶解性差,半融合寿命长,融合孔扩展缓慢以及肌动蛋白驱动的活性成分释放,表面活性剂的分泌过程在几个方面都非常引人注目。细胞舒张以及细胞外ATP的P2Y(2)受体刺激被认为是LB胞吐作用最有效的刺激。对于这两种刺激,胞质Ca2 +浓度[Ca2 +](c)的升高都是关键步骤。这篇综述总结了拉伸或ATP诱导的表面活性剂分泌的可能生理作用和途径,并讨论了与神经内分泌释放机制相比,控制融合前,融合和融合后的分子机制。

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