Abstract
In two types of cell injury in a tissue culture system, the possibility was tested that lysosome rupture may be a lethal cellular reaction to injury, and thus an important general cause of irreversibility of damage in injured tissue. Prior labeling of secondary lysosomes with the fluorochrome acridine orange, or with ferritin, was used to trace changes in lysosomes after applying an injury. The metabolic inhibitors iodoacetate and cyanide were used together to block the cell's energy supply, or attachment of antiserum and subsequent complement attack were used to damage the surface membrane, producing rapid loss of cell volume control. Living cells were studied by time-lapse phase-contrast cinemicrography and fluorescence microscopy, and samples were fixed at intervals for electron microscopy. The cytolytic action of complement was lethal to sensitized cells within 2 hours, but results showed that lysosomes did not rupture for approximately 4 hours and in fact did not release the fluorescent dye until after reaching the postmortem necrotic phase of injury. Cells treated with metabolic inhibitors also showed irreversible alterations, while lysosomes remained intact and retained the ferritin marker. The fluorochrome marker, acridine orange, escaped from lysosomes early after metabolic injury, but the significance of this observation is not clear. The results are interpreted as evidence against the concept that lysosome rupture threatens the survival of injured cells. The original suicide bag mechanism of cell damage thus is apparently not operative in the systems studied. Lysosomes appear to be relatively stable organelles which, following injury of the types studied, burst only after cell death, acting then as scavengers which help to clear cellular debris.
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