Regulation of lysosomal secretion by cortactin drives fibronectin deposition and cell motility

BH Sung, AM Weaver - Bioarchitecture, 2011 - Taylor & Francis
Bioarchitecture, 2011Taylor & Francis
Directional cellular movement is required for various organismal processes, including
immune defense and cancer metastasis. Proper navigation of migrating cells involves
responding to a complex set of extracellular cues, including diffusible chemical signals and
physical structural information. In tissues, conflicting gradients and signals may require cells
to not only respond to the environment but also modulate it for efficient adhesion formation
and directional cell motility. Recently, we found that cells endocytose fibronectin (FN) and …
Directional cellular movement is required for various organismal processes, including immune defense and cancer metastasis. Proper navigation of migrating cells involves responding to a complex set of extracellular cues, including diffusible chemical signals and physical structural information. In tissues, conflicting gradients and signals may require cells to not only respond to the environment but also modulate it for efficient adhesion formation and directional cell motility. Recently, we found that cells endocytose fibronectin (FN) and resecrete it from a late endosomal/lysosomal (LE/Lys) compartment to provide an autocrine extracellular matrix (ECM) substrate for cell motility. Branched actin assembly regulated by cortactin was required for trafficking of FN-containing vesicles from LE/Lys to the cell surface. These findings suggest a model in which migrating cells use lysosomal secretion as a versatile mechanism to modulate the ECM environment, promote adhesion assembly and enhance directional migration.
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