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Infect. Immun., 05 1996, 1614-1620, Vol 64, No. 5
CA Gaydos, JT Summersgill, NN Sahney, JA Ramirez and TC Quinn
Chlamydia pneumoniae has recently been associated with atherosclerotic
lesions in coronary arteries. To investigate the biological basis for the
dissemination and proliferation of this organism in such lesions, the in
vitro growth of C. pneumoniae was studied in two macrophage cell lines,
peripheral blood monocyte-derived macrophages, human bronchoalveolar lavage
macrophages, several endothelial cell lines, and aortic smooth muscle
cells. Five strains of C. pneumoniae were capable of three passages in
human U937 macrophages and in murine RAW 246.7 macrophages. Titers were
suppressed in both macrophage types with each passage, as compared with
growth titers in HEp-2 cells. Both human bronchoalveolar lavage macrophages
and peripheral blood monocyte- derived macrophages were able to inhibit C.
pneumoniae after 96 h of growth. Eleven C. pneumoniae strains were capable
of replicating in normal human aortic artery-derived endothelial cells,
umbilical vein- derived endothelial cells, and pulmonary artery endothelial
cells. Infection in human aortic artery smooth muscle cells was also
established for 13 strains of C. pneumoniae. The in vitro ability of C.
pneumoniae to maintain infections in macrophages, endothelial cells, and
aortic smooth muscle cells may provide support for the hypothesis that C.
pneumoniae can infect such cells and, when infection is followed by an
immune response, may contribute to atheroma formation in vivo. More studies
are needed to investigate the complex relationship between lytic infection
and persistence and the potential for C. pneumoniae to influence the
generation of atheromatous lesions.
Copyright © 1996, American Society for Microbiology
Replication of Chlamydia pneumoniae in vitro in human macrophages, endothelial cells, and aortic artery smooth muscle cells
Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
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