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Journal of Cell Science, Vol 110, Issue 6 731-743, Copyright © 1997 by Company of Biologists
JOURNAL ARTICLES |
C Alvarez-Dominguez, R Roberts and PD Stahl
Department of Cell Biology and Physiology, Washington University, School of Medicine, St Louis, MO 63110, USA.
Previous studies have shown that early phagosome-endosome fusion events following phagocytosis of Listeria monocytogenes are modulated by the live organism. In the present study, we have characterized more fully the intracellular pathway of dead and live Listeria phagosomes. To examine access of endosomal and lysosomal markers to phagosomes containing live and dead Listeria, quantitative electron microscopy was carried out with intact cells using internalized BSA-gold as a marker to quantify transfer of solute from endosomal and lysosomal compartments to phagosomes. To monitor the protein composition of phagosomal membranes and to quantify transfer of HRP from endosomes and lysosomes to phagosomes, highly enriched phagosomes containing live and dead Listeria were isolated. Enriched phagosomal membranes were used for western blotting experiments with endosomal and lysosomal markers. In this study, we used a listeriolysin-deficient mutant, Listeria(hly-), that is retained within the phagosome following phagocytosis. Western blotting experiments indicate that early endosomal markers (mannose receptor, transferrin receptor) and key fusion factors necessary for early events (NSF, alpha/beta-SNAP) but not late endosomal markers (cation dependent mannose 6-phosphate receptor) or lysosomal proteins (cathepsin D or lamp-1) accumulate on the live-Listeria phagosomal membranes. On the contrary, phagosomes containing dead-Listeria are readily accessible by both endocytic and lysosomal markers. Studies with radiolabeled dead- and live-Listeria(hly-) indicate that, following phagocytosis, degradation of the live microorganism is substantially delayed. These findings indicate that dead-Listeria containing phagosomes rapidly mature to a phagolysosomal stage whereas live-Listeria(hly-) prevents maturation, in part, by avoiding fusion with lysosomes. The data suggest that by delaying phagosome maturation and subsequent degradation, Listeria prolongs survival inside the phagosome/endosome assuring bacterial viability as a prelude to escape into the cytoplasm.
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