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Infection of murine macrophage cell lines by Legionella pneumophila
1Department of Veterinary and Biomedical Sciences, University of Nebraska, Lincoln 68583, USA.
Abstract:
Legionella pneumophila causes pneumonia by infecting alveolar macrophages. Although several model systems have been used for L. pneumophila virulence studies, no detailed comparisons have been made between them. An ideal in vitro virulence model should be cost-effective, easy to obtain in large amounts and as relevant as possible to the actual disease. We compared the MH-S cell line to human peripheral blood monocyte-derived macrophages and the J774A.1 cell line. We found that the interactions of L. pneumophila with MH-S at the cellular level resemble those of human primary monocyte-derived macrophages, suggesting that these cells provide a valuable model for this bacterial pathogen.
Insights
The MH-S cell line effectively models Legionella pneumophila infection in alveolar macrophages, mimicking human primary cells. This finding supports MH-S as a valuable and relevant in vitro model for studying bacterial pneumonia.
Area of Science:
- Microbiology
- Cell Biology
- Infectious Diseases
Background:
- Legionella pneumophila is a significant cause of bacterial pneumonia.
- Alveolar macrophages are the primary host cells for L. pneumophila.
- Existing in vitro models for studying L. pneumophila virulence have limitations.
Purpose of the Study:
- To compare the suitability of the MH-S cell line as an in vitro model for L. pneumophila virulence studies.
- To evaluate MH-S cells against human primary monocyte-derived macrophages and the J774A.1 cell line.
Main Methods:
- Cultured MH-S cells, human peripheral blood monocyte-derived macrophages, and J774A.1 cells.
- Infected cell cultures with L. pneumophila.
- Analyzed cellular interactions and pathogen behavior at the cellular level.
Main Results:
- Cellular-level interactions between L. pneumophila and MH-S cells closely resembled those observed with human primary monocyte-derived macrophages.
- The MH-S cell line demonstrated characteristics suitable for in vitro virulence studies.
Conclusions:
- The MH-S cell line represents a valuable and relevant in vitro model for studying Legionella pneumophila pathogenesis.
- MH-S cells offer a cost-effective and accessible alternative for L. pneumophila virulence research.
