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Use of HL cells for improved isolation and passage of Chlamydia pneumoniae
Abstract:
We compared growth of the recently discovered respiratory pathogen Chlamydia pneumoniae in McCoy, HeLa 229, BHK-21, and HL cells. When cells were not pretreated with DEAE-dextran, HL cells had significantly higher mean numbers of inclusion-forming units (IFUs) on initial inoculation than the other cell lines. When cells were pretreated with DEAE-dextran, HeLa 229 and HL cells had equivalent mean numbers of IFUs on initial inoculation. HL cells had strikingly higher mean numbers of IFUs in passage than HeLa 229, BHK-21, or McCoy cells. In addition, HL cells did not require pretreatment with DEAE-dextran and could be used from 2 to 4 days after seeding. We conclude that HL cells are an excellent cell culture system for laboratory propagation of C. pneumoniae and may be a more sensitive cell line for initial isolation.
Insights
HL cells offer superior growth for the respiratory pathogen Chlamydia pneumoniae (C. pneumoniae), showing higher inclusion-forming units (IFUs) and simplifying lab propagation. This makes HL cells an excellent choice for C. pneumoniae research.
Area of Science:
- Microbiology
- Cell Biology
Background:
- Chlamydia pneumoniae is an emerging respiratory pathogen.
- Efficient cell culture systems are crucial for studying C. pneumoniae.
Purpose of the Study:
- To compare the growth of Chlamydia pneumoniae in four different cell lines: McCoy, HeLa 229, BHK-21, and HL cells.
- To determine the optimal cell line for C. pneumoniae propagation and isolation.
Main Methods:
- Chlamydia pneumoniae growth was assessed in McCoy, HeLa 229, BHK-21, and HL cells.
- Inclusion-forming units (IFUs) were quantified to measure bacterial growth.
- The effect of DEAE-dextran pretreatment on cell lines was evaluated.
Main Results:
- HL cells showed significantly higher mean IFUs on initial inoculation compared to other cell lines without DEAE-dextran pretreatment.
- HeLa 229 and HL cells had equivalent IFUs with DEAE-dextran pretreatment.
- HL cells exhibited markedly higher IFUs during passage and did not require DEAE-dextran pretreatment.
- HL cells were usable 2-4 days post-seeding.
Conclusions:
- HL cells represent an excellent cell culture system for laboratory propagation of Chlamydia pneumoniae.
- HL cells may offer enhanced sensitivity for the initial isolation of C. pneumoniae.