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Journal Article | Research Support, Non-U.S. Gov't

Association of Legionella pneumophila with the macrophage endoplasmic reticulum.

M S Swanson, R R Isberg
M S Swanson
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R R Isberg
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ABSTRACT

Legionella pneumophila replicates within a membrane-bounded compartment that is studded with ribosomes. In this study we investigated whether these ribosomes originate from the cytoplasmic pool or are associated with host endoplasmic reticulum (ER). Immunofluorescence and electron microscopic localization studies of ER proteins in macrophages infected with L. pneumophila indicated that the bacteria reside in a compartment surrounded by ER. An L. pneumophila mutant that grows slowly in macrophages was slow to associate with host ER, providing genetic evidence in support of the hypothesis that this specialized vacuole is required for intracellular bacterial growth. Ultrastructural studies, in which the ER luminal protein BiP was labeled by immunoperoxidase cytochemistry, revealed that L. pneumophila replication vacuoles resemble nascent autophagosomes. Furthermore, short-term amino acid starvation of macrophages, which stimulated host autophagosomes. Furthermore, short-term amino acid starvation of macrophages, which stimulated host autophagy, increased association of the bacteria with the ER and enhanced bacterial growth. These results are compatible with the hypothesis that L. pneumophila exploits the autophagy machinery of macrophages to establish an intracellular niche favorable for replication.

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Association of Legionella pneumophila with the macrophage endoplasmic reticulum.
M S Swanson, R R Isberg
Infection and Immunity Sep 1995, 63 (9) 3609-3620; DOI:

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Association of Legionella pneumophila with the macrophage endoplasmic reticulum.
M S Swanson, R R Isberg
Infection and Immunity Sep 1995, 63 (9) 3609-3620; DOI:
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