Journal article
Babesia bovis-Stimulated Macrophages Express Interleukin-1β, Interleukin-12, Tumor Necrosis Factor Alpha, and Nitric Oxide and Inhibit Parasite Replication In Vitro
Infection and immunity, Vol.68(9), pp.5139-5145
09/2000
Handle:
https://hdl.handle.net/2376/113517
PMCID: PMC101760
PMID: 10948137
Abstract
The tick-transmitted hemoparasite
Babesia bovis
causes an acute infection that results in persistence and immunity against challenge infection in cattle that control the initial parasitemia. Resolution of acute infection with this protozoal pathogen is believed to be dependent on products of activated macrophages (Mφ), including inflammatory cytokines and nitric oxide (NO) and its derivatives.
B. bovis
stimulates inducible nitric oxide synthase (iNOS) and production of NO in bovine Mφ, and chemical donors of NO inhibit the growth of
B. bovis
in vitro. However, the induction of inflammatory cytokines in Mφ by babesial parasites has not been described, and the antiparasitic activity of NO produced by
B. bovis
-stimulated Mφ has not been definitively demonstrated. We report that monocyte-derived Mφ activated by
B. bovis
expressed enhanced levels of inflammatory cytokines interleukin-1β (IL-1β), IL-12, and tumor necrosis factor alpha that are important for stimulating innate and acquired immunity against protozoal pathogens. Furthermore, a lipid fraction of
B. bovis
-infected erythrocytes stimulated iNOS expression and NO production by Mφ. Cocultures of Mφ and
B. bovis
-infected erythrocytes either in contact or physically separated resulted in reduced parasite viability. However, NO produced by bovine Mφ in response to
B. bovis
-infected erythrocytes was only partially responsible for parasite growth inhibition, suggesting that additional factors contribute to the inhibition of
B. bovis
replication. These findings demonstrate that
B. bovis
induces an innate immune response that is capable of controlling parasite replication and that could potentially result in host survival and parasite persistence.
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Details
- Title
- Babesia bovis-Stimulated Macrophages Express Interleukin-1β, Interleukin-12, Tumor Necrosis Factor Alpha, and Nitric Oxide and Inhibit Parasite Replication In Vitro
- Creators
- Lisl K. M Shoda - Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040Guy H Palmer - Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040Jorge Florin-Christensen - Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040Monica Florin-Christensen - Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040Dale L Godson - Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040Wendy C Brown - Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040
- Publication Details
- Infection and immunity, Vol.68(9), pp.5139-5145
- Academic Unit
- Veterinary Microbiology and Pathology, Department of; Paul G. Allen School for Global Animal Health
- Publisher
- American Society for Microbiology
- Identifiers
- 99900547509401842
- Language
- English
- Resource Type
- Journal article