Cell and Developmental Biology Department, State University of New York Upstate Medical University, Syracuse, NY, USA.
IFOM, FIRC Institute of Molecular Oncology, Milan, Italy.
Trends Cell Biol. 2020 Feb;30(2):157-167. doi: 10.1016/j.tcb.2019.11.002. Epub 2019 Dec 10.
Phagocytosis is a receptor-mediated, actin-dependent process of internalization of large extracellular particles, such as pathogens or apoptotic cells. Engulfment of phagocytic targets requires the activity of myosins, actin-dependent molecular motors, which perform a variety of functions at distinct steps during phagocytosis. By applying force to actin filaments, the plasma membrane, and intracellular proteins and organelles, myosins can generate contractility, directly regulate actin assembly to ensure proper phagocytic internalization, and translocate phagosomes or other cargo to appropriate cellular locations. Recent studies using engineered microenvironments and phagocytic targets have demonstrated how altering the actomyosin cytoskeleton affects phagocytic behavior. Here, we discuss how studies using genetic and biochemical manipulation of myosins, force measurement techniques, and live-cell imaging have advanced our understanding of how specific myosins function at individual steps of phagocytosis.
吞噬作用是一种受体介导的、肌动蛋白依赖性的胞吞过程,可将大的细胞外颗粒(如病原体或凋亡细胞)内化。吞噬作用的吞噬目标的吞噬需要肌球蛋白的活性,肌球蛋白是肌动蛋白依赖性分子马达,在吞噬作用的不同步骤中发挥多种功能。通过对肌动蛋白丝、质膜和细胞内蛋白质和细胞器施加力,肌球蛋白可以产生收缩力,直接调节肌动蛋白组装以确保适当的吞噬内化,并将吞噬体或其他货物转运到适当的细胞位置。最近使用工程微环境和吞噬作用靶标的研究表明,改变肌动球蛋白细胞骨架如何影响吞噬作用行为。在这里,我们讨论了使用肌球蛋白的遗传和生化操作、力测量技术和活细胞成像研究如何推进我们对特定肌球蛋白在吞噬作用的各个步骤中的功能的理解。