Above the fray: Surface remodeling by secreted lysosomal enzymes leads to endocytosis-mediated plasma membrane repair

被引:33
作者
Andrews, N. W. [1 ]
Corrotte, M. [1 ]
Castro-Gomes, T. [1 ]
机构
[1] Univ Maryland, Dept Cell Biol & Mol Genet, College Pk, MD 20742 USA
关键词
Plasma membrane; Repair; Resealing; Lysosome; Hydrolase; Sphingomyelinase; Protease; ACID SPHINGOMYELINASE; CROSS-LINKING; MUSCULAR-DYSTROPHY; CELL; EXOCYTOSIS; DYSFERLIN; CERAMIDE; VESICLES; RECRUITMENT; CAVEOLIN-3;
D O I
10.1016/j.semcdb.2015.09.022
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The study of plasma membrane repair is coming of age. Mirroring human adolescence, the field shows at the same time signs of maturity and significant uncertainty, confusion and skepticism. Here we discuss concepts that emerged from experimental data over the years, some of which are solidly established while others are still subject to different interpretations. The firmly established concepts include the critical requirement for Ca2+ in wound repair, and the role of rapid exocytosis of intracellular vesicles. Lysosomes are being increasingly recognized as the major vesicles involved in injury-induced exocytosis in many cell types, as a growing number of laboratories detect markers for these organelles on the cell surface and lysosomal hydrolases in the supernatant of wounded cells. The more recent observation of massive endocytosis following Ca2+-triggered exocytosis initially came as a surprise, but this finding is also being increasingly reported by different groups, shifting the discussion to the mechanisms by which endocytosis promotes repair, and whether it operates or not in parallel with the shedding of membrane blebs. We discuss how the abundant intracellular vesicles that undergo homotypic fusion close to wound sites, previously interpreted as exocytic membrane patches, actually acquire extracellular tracers demonstrating their endocytic origin. We also suggest that an initial, temporary patch that prevents cytosol loss until the bilayer is restored might result not from vesicular fusion, but from rapid Ca2+-dependent crosslinking and aggregation of cytosolic proteins. Finally, we propose that cell surface remodeling, orchestrated by the extracellular release of lysosomal hydrolases and perhaps also cytosolic molecules, may represent a key aspect of the plasma membrane repair mechanism that has received little attention so far. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2 / 9
页数:8
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