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Open Access Highly Accessed Research article

Tularemia induces different biochemical responses in BALB/c mice and common voles

Hana Bandouchova1, Jana Sedlackova1, Miroslav Pohanka2, Ladislav Novotny2, Martin Hubalek3, Frantisek Treml4, Frantisek Vitula1 and Jiri Pikula1*

Author Affiliations

1 Department of Veterinary Ecology and Environmental Protection, Faculty of Veterinary Hygiene and Ecology, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic

2 Centre of Advanced Studies, University of Defence, Hradec Kralove, Czech Republic

3 Institute of Molecular Pathology, University of Defence, Hradec Kralove, Czech Republic

4 Department of Infectious Diseases and Epizootiology, Faculty of Veterinary Medicine, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic

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BMC Infectious Diseases 2009, 9:101  doi:10.1186/1471-2334-9-101

Published: 26 June 2009

Abstract

Background

Both BALB/c mice and common voles (Microtus arvalis) are considered highly susceptible to tularemia. However, the common vole is reported to harbour Francisella tularensis in European habitats as well as to survive longer with chronic shedding of the bacterium. The purpose of the present study was to compare the response of these two rodents to a wild Francisella tularensis subsp. holarctica strain infection.

Methods

Rodents were evaluated for differences in the total antioxidant capacity derived from low-molecular-weight antioxidants, biochemistry including lipid metabolism, tissue bacterial burdens and histopathology following experimental intraperitoneal infection with 160 colony forming units (CFU) pro toto.

Results

Bacterial burdens in common voles started to develop later post-exposure and amounted to lower levels than in BALB/c mice. Elevation of liver function enzymes was more pronounced in mice than common voles and there were marked differences in lipid metabolism in the course of tularemia in these two species. Hypertriglyceridemia and hypercholesterolemia developed in mice, while physiologically higher levels of triglycerides and cholesterol showed a decreasing tendency in common voles.

On the other hand, the total plasma antioxidant capacity gradually dropped to 81.5% in mice on day 5 post-infection, while it increased to 130% on day 6 post-infection in common voles. Significant correlations between tissue bacterial burdens and several biochemical parameters were found.

Conclusion

As differences in lipid metabolism and the total antioxidant capacity of highly susceptible rodent species were demonstrated, the role of triglycerides, cholesterol and antioxidants in tularemic sepsis should be further investigated.