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Infect Immun. 1991 December; 59(12): 4465-4472

Mobilization of F-actin and clathrin during redistribution of Chlamydia trachomatis to an intracellular site in eucaryotic cells.

M Majeed and E Kihlström

Department of Clinical Bacteriology, Faculty of Health Sciences, Linköping University, Sweden.

ABSTRACT

Immunofluorescence was used to examine the distribution of Chlamydia trachomatis serovars L2 and E, F-actin, and clathrin in infected McCoy and HeLa cells. After incubation at 4 degrees C, C. trachomatis serovar L2 was randomly distributed on the McCoy cell surface. After a temperature shift to 37 degrees C, chlamydiae redistributed, within 30 min, to one local aggregate in the central or perinuclear region of individual cells. About 90% of these aggregated chlamydiae were intracellularly localized, but some remained randomly distributed on the cell surface. Similar results were obtained with HeLa cells and C. trachomatis serovar E, except that the redistribution was slower in HeLa cells than in McCoy cells and fewer cells infected with serovar E exhibited a local aggregate than those infected with serovar L2. Cytochalasin D inhibited more than 90% of this local aggregation. Instead, in cytochalasin D-treated cells, the entry of chlamydiae was inhibited and the organisms became localized on the cell surface in a peripheral local aggregate that distributed in a manner similar to that of phalloidin-stained actin. In a double immunofluorescence assay, F-actin and clathrin aggregated correspondingly in time and position with central or perinuclear aggregation of chlamydiae. These results indicate that polymerized actin and clathrin participate in a rapid redistribution of chlamydiae to an intracellular aggregate.

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Infect Immun. 1991 December; 59(12): 4465-4472

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