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M94A3145.TXT
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Document 3145
DOCN M94A3145
TI Replication of Chlamydia trachomatis and Chlamydia pneumoniae in human
monocytic cell line U-937.
DT 9412
AU Numazaki K; Suzuki K; Chiba S; Department of Pediatrics, School of
Medicine, Sapporo Medical; University, Japan.
SO Int Conf AIDS. 1994 Aug 7-12;10(1):142 (abstract no. PA0187). Unique
Identifier : AIDSLINE ICA10/94369430
AB OBJECTIVE: Despite the various pathogenic effects of Chlamydiae, there
is only limited direct evidence that chlamydia infections occur in
monocytes and macrophages. The present study was designed to determine
the effects of C. trachomatis and C. pneumoniae on monocytes-macrophages
and the mechanisms of persistence in these cells. METHODS: For the
purpose of infection, U-937 cells were pretreated with polybrene and
inoculated with C. trachomatis L2 or C. pneumoniae TW-183. Cells and
media were harvested at intervals of 72 h. Polymerase chain reaction
(PCR) and endonuclease analysis were used to detect chlamydial genomes
from harvested cells. The expression of surface antigens on
Chlamydia-infected U-937 cells was assessed by flow cytometry (FCM).
RESULTS: Chlamydial DNA which code ompA of major outer membrane protein
were detected from C. trachomatis L2-inoculated U-937 cells over a
period of 150 days by PCR. Chlamydial DNA had been detected also from C.
pneumoniae TW-183-inoculated U-937 cells. U-937 cells infected with C.
pneumoniae expressed higher level of Leu-M1 by FCM. DISCUSSION AND
CONCLUSIONS: It is likely that monocytes-macrophages play an important
role in the persistence of infections of C. trachomatis or C. pneumoniae
and act as reservoirs for dissemination.
DE Cell Line Chlamydia pneumoniae/GENETICS/*PHYSIOLOGY Chlamydia
trachomatis/GENETICS/*PHYSIOLOGY *DNA Replication DNA,
Bacterial/*BIOSYNTHESIS Flow Cytometry/METHODS Human Lymphoma,
Large-Cell Macrophages/*MICROBIOLOGY Monocytes/*MICROBIOLOGY
Polymerase Chain Reaction/METHODS Restriction Mapping Tumor Cells,
Cultured MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).