J. Cell Biol.
© The Rockefeller University Press
0021-9525/97/04/93/12 $2.00
Volume 137, Number 1, April 7, 1997 93-104

Lysosomes Behave as Ca²⁺-regulated Exocytic Vesicles in Fibroblasts and Epithelial Cells

Ana Rodríguez,^* Paul Webster,^* Javier Ortego, and Norma W. Andrews^*

^* Department of Cell Biology,  Department of Ophthalmology, Yale University School of Medicine, New Haven, Connecticut 06520

Lysosomes are considered to be a terminal degradative compartment of the endocytic pathway, into which transport is mostly unidirectional. However, specialized secretory vesicles regulated by Ca²⁺, such as neutrophil azurophil granules, mast cell-specific granules, and cytotoxic lymphocyte lytic granules, share characteristics with lysosomes that may reflect a common biogenesis. In addition, the involvement of Ca²⁺ transients in the invasion mechanism of the parasite Trypanosoma cruzi, which occurs by fusion of lysosomes with the plasma membrane, suggested that lysosome exocytosis might be a generalized process present in most cell types.

Here we demonstrate that elevation in the intracellular free Ca²⁺ concentration of normal rat kidney (NRK) fibroblasts induces fusion of lysosomes with the plasma membrane. This was verified by measuring the release of the lysosomal enzyme -hexosaminidase, the appearance on the plasma membrane of the lysosomal glycoprotein lgp120, the release of fluid-phase tracers previously loaded into lysosomes, and the release of the lysosomally processed form of cathepsin D. Exposure to the Ca²⁺ ionophore ionomycin or addition of Ca²⁺containing buffers to streptolysin O-permeabilized cells induced exocytosis of ~10% of the total lysosomes of NRK cells. The process was also detected in other cell types such as epithelial cells and myoblasts. Lysosomal exocytosis was found to require micromolar levels of Ca²⁺ and to be temperature and ATP dependent, similar to Ca²⁺-regulated secretory mechanisms in specialized cells.

These findings highlight a novel role for lysosomes in cellular membrane traffic and suggest that fusion of lysosomes with the plasma membrane may be an ubiquitous form of Ca²⁺-regulated exocytosis.

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