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Infect. Immun., Dec 1996, 5366-5372, Vol 64, No. 12
MA Scidmore, DD Rockey, ER Fischer, RA Heinzen and T Hackstadt
Chlamydiae replicate intracellularly within a vacuole that has recently
been characterized as intersecting an exocytic pathway. One of the initial
events during chlamydial infection is the expression of a chlamydial early
gene product(s) that effectively isolates the inclusion from the
endocytic-lysosomal pathway and makes it fusogenic with
sphingomyelin-containing exocytic vesicles. Associated with this change in
vesicular interaction is the delivery of the vacuole to the peri-Golgi
region of the host cell. Inhibition of chlamydial early transcription or
translation causes Chlamydia trachomatis-containing vesicles to remain
dispersed throughout the cytoplasm, where they eventually fuse with
lysosomes. Chlamydiae that have been internalized by Fc-mediated
endocytosis also avoid lysosomal digestion by a mechanism that requires
chlamydial protein synthesis. These results suggest that the vesicular
interactions of the chlamydial inclusion are defined by parasite-directed
modification of the endocytic vesicle rather than by the route of
internalization.
Copyright © 1996, American Society for Microbiology
Vesicular interactions of the Chlamydia trachomatis inclusion are determined by chlamydial early protein synthesis rather than route of entry
Laboratory of Intracellular Parasites, National Institute of Allergy and Infectious Diseases, Rocky Mountain Laboratories, Hamilton, Montana 59840, USA.
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